xref: /linux/include/linux/sched.h (revision 67d1214551e800f9fe7dc7c47a346d2df0fafed5)
11da177e4SLinus Torvalds #ifndef _LINUX_SCHED_H
21da177e4SLinus Torvalds #define _LINUX_SCHED_H
31da177e4SLinus Torvalds 
4b7b3c76aSDavid Woodhouse /*
5b7b3c76aSDavid Woodhouse  * cloning flags:
6b7b3c76aSDavid Woodhouse  */
7b7b3c76aSDavid Woodhouse #define CSIGNAL		0x000000ff	/* signal mask to be sent at exit */
8b7b3c76aSDavid Woodhouse #define CLONE_VM	0x00000100	/* set if VM shared between processes */
9b7b3c76aSDavid Woodhouse #define CLONE_FS	0x00000200	/* set if fs info shared between processes */
10b7b3c76aSDavid Woodhouse #define CLONE_FILES	0x00000400	/* set if open files shared between processes */
11b7b3c76aSDavid Woodhouse #define CLONE_SIGHAND	0x00000800	/* set if signal handlers and blocked signals shared */
12b7b3c76aSDavid Woodhouse #define CLONE_PTRACE	0x00002000	/* set if we want to let tracing continue on the child too */
13b7b3c76aSDavid Woodhouse #define CLONE_VFORK	0x00004000	/* set if the parent wants the child to wake it up on mm_release */
14b7b3c76aSDavid Woodhouse #define CLONE_PARENT	0x00008000	/* set if we want to have the same parent as the cloner */
15b7b3c76aSDavid Woodhouse #define CLONE_THREAD	0x00010000	/* Same thread group? */
16b7b3c76aSDavid Woodhouse #define CLONE_NEWNS	0x00020000	/* New namespace group? */
17b7b3c76aSDavid Woodhouse #define CLONE_SYSVSEM	0x00040000	/* share system V SEM_UNDO semantics */
18b7b3c76aSDavid Woodhouse #define CLONE_SETTLS	0x00080000	/* create a new TLS for the child */
19b7b3c76aSDavid Woodhouse #define CLONE_PARENT_SETTID	0x00100000	/* set the TID in the parent */
20b7b3c76aSDavid Woodhouse #define CLONE_CHILD_CLEARTID	0x00200000	/* clear the TID in the child */
21b7b3c76aSDavid Woodhouse #define CLONE_DETACHED		0x00400000	/* Unused, ignored */
22b7b3c76aSDavid Woodhouse #define CLONE_UNTRACED		0x00800000	/* set if the tracing process can't force CLONE_PTRACE on this clone */
23b7b3c76aSDavid Woodhouse #define CLONE_CHILD_SETTID	0x01000000	/* set the TID in the child */
2443bb40c9SDave Jones /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
2543bb40c9SDave Jones    and is now available for re-use. */
26071df104SSerge E. Hallyn #define CLONE_NEWUTS		0x04000000	/* New utsname group? */
2725b21cb2SKirill Korotaev #define CLONE_NEWIPC		0x08000000	/* New ipcs */
2877ec739dSSerge E. Hallyn #define CLONE_NEWUSER		0x10000000	/* New user namespace */
2930e49c26SPavel Emelyanov #define CLONE_NEWPID		0x20000000	/* New pid namespace */
30169e3674SEric W. Biederman #define CLONE_NEWNET		0x40000000	/* New network namespace */
31fadad878SJens Axboe #define CLONE_IO		0x80000000	/* Clone io context */
32b7b3c76aSDavid Woodhouse 
33b7b3c76aSDavid Woodhouse /*
34b7b3c76aSDavid Woodhouse  * Scheduling policies
35b7b3c76aSDavid Woodhouse  */
36b7b3c76aSDavid Woodhouse #define SCHED_NORMAL		0
37b7b3c76aSDavid Woodhouse #define SCHED_FIFO		1
38b7b3c76aSDavid Woodhouse #define SCHED_RR		2
39b7b3c76aSDavid Woodhouse #define SCHED_BATCH		3
400e6aca43SIngo Molnar /* SCHED_ISO: reserved but not implemented yet */
410e6aca43SIngo Molnar #define SCHED_IDLE		5
42ca94c442SLennart Poettering /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
43ca94c442SLennart Poettering #define SCHED_RESET_ON_FORK     0x40000000
44b7b3c76aSDavid Woodhouse 
45a3b6714eSDavid Woodhouse #ifdef __KERNEL__
46b7b3c76aSDavid Woodhouse 
47b7b3c76aSDavid Woodhouse struct sched_param {
48b7b3c76aSDavid Woodhouse 	int sched_priority;
49b7b3c76aSDavid Woodhouse };
50b7b3c76aSDavid Woodhouse 
511da177e4SLinus Torvalds #include <asm/param.h>	/* for HZ */
521da177e4SLinus Torvalds 
531da177e4SLinus Torvalds #include <linux/capability.h>
541da177e4SLinus Torvalds #include <linux/threads.h>
551da177e4SLinus Torvalds #include <linux/kernel.h>
561da177e4SLinus Torvalds #include <linux/types.h>
571da177e4SLinus Torvalds #include <linux/timex.h>
581da177e4SLinus Torvalds #include <linux/jiffies.h>
591da177e4SLinus Torvalds #include <linux/rbtree.h>
601da177e4SLinus Torvalds #include <linux/thread_info.h>
611da177e4SLinus Torvalds #include <linux/cpumask.h>
621da177e4SLinus Torvalds #include <linux/errno.h>
631da177e4SLinus Torvalds #include <linux/nodemask.h>
64c92ff1bdSMartin Schwidefsky #include <linux/mm_types.h>
651da177e4SLinus Torvalds 
661da177e4SLinus Torvalds #include <asm/page.h>
671da177e4SLinus Torvalds #include <asm/ptrace.h>
681da177e4SLinus Torvalds #include <asm/cputime.h>
691da177e4SLinus Torvalds 
701da177e4SLinus Torvalds #include <linux/smp.h>
711da177e4SLinus Torvalds #include <linux/sem.h>
721da177e4SLinus Torvalds #include <linux/signal.h>
731da177e4SLinus Torvalds #include <linux/compiler.h>
741da177e4SLinus Torvalds #include <linux/completion.h>
751da177e4SLinus Torvalds #include <linux/pid.h>
761da177e4SLinus Torvalds #include <linux/percpu.h>
771da177e4SLinus Torvalds #include <linux/topology.h>
783e26c149SPeter Zijlstra #include <linux/proportions.h>
791da177e4SLinus Torvalds #include <linux/seccomp.h>
80e56d0903SIngo Molnar #include <linux/rcupdate.h>
8105725f7eSJiri Pirko #include <linux/rculist.h>
8223f78d4aSIngo Molnar #include <linux/rtmutex.h>
831da177e4SLinus Torvalds 
84a3b6714eSDavid Woodhouse #include <linux/time.h>
85a3b6714eSDavid Woodhouse #include <linux/param.h>
86a3b6714eSDavid Woodhouse #include <linux/resource.h>
87a3b6714eSDavid Woodhouse #include <linux/timer.h>
88a3b6714eSDavid Woodhouse #include <linux/hrtimer.h>
897c3ab738SAndrew Morton #include <linux/task_io_accounting.h>
909745512cSArjan van de Ven #include <linux/latencytop.h>
919e2b2dc4SDavid Howells #include <linux/cred.h>
92fa14ff4aSPeter Zijlstra #include <linux/llist.h>
937b44ab97SEric W. Biederman #include <linux/uidgid.h>
94a3b6714eSDavid Woodhouse 
95a3b6714eSDavid Woodhouse #include <asm/processor.h>
9636d57ac4SH. J. Lu 
971da177e4SLinus Torvalds struct exec_domain;
98c87e2837SIngo Molnar struct futex_pi_state;
99286100a6SAlexey Dobriyan struct robust_list_head;
100bddd87c7SAkinobu Mita struct bio_list;
1015ad4e53bSAl Viro struct fs_struct;
102cdd6c482SIngo Molnar struct perf_event_context;
10373c10101SJens Axboe struct blk_plug;
1041da177e4SLinus Torvalds 
1051da177e4SLinus Torvalds /*
1061da177e4SLinus Torvalds  * List of flags we want to share for kernel threads,
1071da177e4SLinus Torvalds  * if only because they are not used by them anyway.
1081da177e4SLinus Torvalds  */
1091da177e4SLinus Torvalds #define CLONE_KERNEL	(CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
1101da177e4SLinus Torvalds 
1111da177e4SLinus Torvalds /*
1121da177e4SLinus Torvalds  * These are the constant used to fake the fixed-point load-average
1131da177e4SLinus Torvalds  * counting. Some notes:
1141da177e4SLinus Torvalds  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
1151da177e4SLinus Torvalds  *    a load-average precision of 10 bits integer + 11 bits fractional
1161da177e4SLinus Torvalds  *  - if you want to count load-averages more often, you need more
1171da177e4SLinus Torvalds  *    precision, or rounding will get you. With 2-second counting freq,
1181da177e4SLinus Torvalds  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
1191da177e4SLinus Torvalds  *    11 bit fractions.
1201da177e4SLinus Torvalds  */
1211da177e4SLinus Torvalds extern unsigned long avenrun[];		/* Load averages */
1222d02494fSThomas Gleixner extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
1231da177e4SLinus Torvalds 
1241da177e4SLinus Torvalds #define FSHIFT		11		/* nr of bits of precision */
1251da177e4SLinus Torvalds #define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */
1260c2043abSLinus Torvalds #define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */
1271da177e4SLinus Torvalds #define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
1281da177e4SLinus Torvalds #define EXP_5		2014		/* 1/exp(5sec/5min) */
1291da177e4SLinus Torvalds #define EXP_15		2037		/* 1/exp(5sec/15min) */
1301da177e4SLinus Torvalds 
1311da177e4SLinus Torvalds #define CALC_LOAD(load,exp,n) \
1321da177e4SLinus Torvalds 	load *= exp; \
1331da177e4SLinus Torvalds 	load += n*(FIXED_1-exp); \
1341da177e4SLinus Torvalds 	load >>= FSHIFT;
1351da177e4SLinus Torvalds 
1361da177e4SLinus Torvalds extern unsigned long total_forks;
1371da177e4SLinus Torvalds extern int nr_threads;
1381da177e4SLinus Torvalds DECLARE_PER_CPU(unsigned long, process_counts);
1391da177e4SLinus Torvalds extern int nr_processes(void);
1401da177e4SLinus Torvalds extern unsigned long nr_running(void);
1411da177e4SLinus Torvalds extern unsigned long nr_uninterruptible(void);
1421da177e4SLinus Torvalds extern unsigned long nr_iowait(void);
1438c215bd3SPeter Zijlstra extern unsigned long nr_iowait_cpu(int cpu);
14469d25870SArjan van de Ven extern unsigned long this_cpu_load(void);
14569d25870SArjan van de Ven 
14669d25870SArjan van de Ven 
1470f004f5aSPeter Zijlstra extern void calc_global_load(unsigned long ticks);
1485aaa0b7aSPeter Zijlstra extern void update_cpu_load_nohz(void);
1491da177e4SLinus Torvalds 
1507e49fcceSSteven Rostedt extern unsigned long get_parent_ip(unsigned long addr);
1517e49fcceSSteven Rostedt 
15243ae34cbSIngo Molnar struct seq_file;
15343ae34cbSIngo Molnar struct cfs_rq;
1544cf86d77SIngo Molnar struct task_group;
15543ae34cbSIngo Molnar #ifdef CONFIG_SCHED_DEBUG
15643ae34cbSIngo Molnar extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
15743ae34cbSIngo Molnar extern void proc_sched_set_task(struct task_struct *p);
15843ae34cbSIngo Molnar extern void
1595cef9ecaSIngo Molnar print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
16043ae34cbSIngo Molnar #else
16143ae34cbSIngo Molnar static inline void
16243ae34cbSIngo Molnar proc_sched_show_task(struct task_struct *p, struct seq_file *m)
16343ae34cbSIngo Molnar {
16443ae34cbSIngo Molnar }
16543ae34cbSIngo Molnar static inline void proc_sched_set_task(struct task_struct *p)
16643ae34cbSIngo Molnar {
16743ae34cbSIngo Molnar }
16843ae34cbSIngo Molnar static inline void
1695cef9ecaSIngo Molnar print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
17043ae34cbSIngo Molnar {
17143ae34cbSIngo Molnar }
17243ae34cbSIngo Molnar #endif
1731da177e4SLinus Torvalds 
1744a8342d2SLinus Torvalds /*
1754a8342d2SLinus Torvalds  * Task state bitmask. NOTE! These bits are also
1764a8342d2SLinus Torvalds  * encoded in fs/proc/array.c: get_task_state().
1774a8342d2SLinus Torvalds  *
1784a8342d2SLinus Torvalds  * We have two separate sets of flags: task->state
1794a8342d2SLinus Torvalds  * is about runnability, while task->exit_state are
1804a8342d2SLinus Torvalds  * about the task exiting. Confusing, but this way
1814a8342d2SLinus Torvalds  * modifying one set can't modify the other one by
1824a8342d2SLinus Torvalds  * mistake.
1834a8342d2SLinus Torvalds  */
1841da177e4SLinus Torvalds #define TASK_RUNNING		0
1851da177e4SLinus Torvalds #define TASK_INTERRUPTIBLE	1
1861da177e4SLinus Torvalds #define TASK_UNINTERRUPTIBLE	2
187f021a3c2SMatthew Wilcox #define __TASK_STOPPED		4
188f021a3c2SMatthew Wilcox #define __TASK_TRACED		8
1894a8342d2SLinus Torvalds /* in tsk->exit_state */
1904a8342d2SLinus Torvalds #define EXIT_ZOMBIE		16
1914a8342d2SLinus Torvalds #define EXIT_DEAD		32
1924a8342d2SLinus Torvalds /* in tsk->state again */
193af927232SMike Galbraith #define TASK_DEAD		64
194f021a3c2SMatthew Wilcox #define TASK_WAKEKILL		128
195e9c84311SPeter Zijlstra #define TASK_WAKING		256
196e1781538SPeter Zijlstra #define TASK_STATE_MAX		512
197f021a3c2SMatthew Wilcox 
19844d90df6SPeter Zijlstra #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
19973342151SPeter Zijlstra 
200e1781538SPeter Zijlstra extern char ___assert_task_state[1 - 2*!!(
201e1781538SPeter Zijlstra 		sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
202f021a3c2SMatthew Wilcox 
203f021a3c2SMatthew Wilcox /* Convenience macros for the sake of set_task_state */
204f021a3c2SMatthew Wilcox #define TASK_KILLABLE		(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
205f021a3c2SMatthew Wilcox #define TASK_STOPPED		(TASK_WAKEKILL | __TASK_STOPPED)
206f021a3c2SMatthew Wilcox #define TASK_TRACED		(TASK_WAKEKILL | __TASK_TRACED)
2071da177e4SLinus Torvalds 
20892a1f4bcSMatthew Wilcox /* Convenience macros for the sake of wake_up */
20992a1f4bcSMatthew Wilcox #define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
210f021a3c2SMatthew Wilcox #define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
21192a1f4bcSMatthew Wilcox 
21292a1f4bcSMatthew Wilcox /* get_task_state() */
21392a1f4bcSMatthew Wilcox #define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \
214f021a3c2SMatthew Wilcox 				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
215f021a3c2SMatthew Wilcox 				 __TASK_TRACED)
21692a1f4bcSMatthew Wilcox 
217f021a3c2SMatthew Wilcox #define task_is_traced(task)	((task->state & __TASK_TRACED) != 0)
218f021a3c2SMatthew Wilcox #define task_is_stopped(task)	((task->state & __TASK_STOPPED) != 0)
2198f92054eSDavid Howells #define task_is_dead(task)	((task)->exit_state != 0)
22092a1f4bcSMatthew Wilcox #define task_is_stopped_or_traced(task)	\
221f021a3c2SMatthew Wilcox 			((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
22292a1f4bcSMatthew Wilcox #define task_contributes_to_load(task)	\
223e3c8ca83SNathan Lynch 				((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
224376fede8STejun Heo 				 (task->flags & PF_FROZEN) == 0)
2251da177e4SLinus Torvalds 
2261da177e4SLinus Torvalds #define __set_task_state(tsk, state_value)		\
2271da177e4SLinus Torvalds 	do { (tsk)->state = (state_value); } while (0)
2281da177e4SLinus Torvalds #define set_task_state(tsk, state_value)		\
2291da177e4SLinus Torvalds 	set_mb((tsk)->state, (state_value))
2301da177e4SLinus Torvalds 
231498d0c57SAndrew Morton /*
232498d0c57SAndrew Morton  * set_current_state() includes a barrier so that the write of current->state
233498d0c57SAndrew Morton  * is correctly serialised wrt the caller's subsequent test of whether to
234498d0c57SAndrew Morton  * actually sleep:
235498d0c57SAndrew Morton  *
236498d0c57SAndrew Morton  *	set_current_state(TASK_UNINTERRUPTIBLE);
237498d0c57SAndrew Morton  *	if (do_i_need_to_sleep())
238498d0c57SAndrew Morton  *		schedule();
239498d0c57SAndrew Morton  *
240498d0c57SAndrew Morton  * If the caller does not need such serialisation then use __set_current_state()
241498d0c57SAndrew Morton  */
2421da177e4SLinus Torvalds #define __set_current_state(state_value)			\
2431da177e4SLinus Torvalds 	do { current->state = (state_value); } while (0)
2441da177e4SLinus Torvalds #define set_current_state(state_value)		\
2451da177e4SLinus Torvalds 	set_mb(current->state, (state_value))
2461da177e4SLinus Torvalds 
2471da177e4SLinus Torvalds /* Task command name length */
2481da177e4SLinus Torvalds #define TASK_COMM_LEN 16
2491da177e4SLinus Torvalds 
2501da177e4SLinus Torvalds #include <linux/spinlock.h>
2511da177e4SLinus Torvalds 
2521da177e4SLinus Torvalds /*
2531da177e4SLinus Torvalds  * This serializes "schedule()" and also protects
2541da177e4SLinus Torvalds  * the run-queue from deletions/modifications (but
2551da177e4SLinus Torvalds  * _adding_ to the beginning of the run-queue has
2561da177e4SLinus Torvalds  * a separate lock).
2571da177e4SLinus Torvalds  */
2581da177e4SLinus Torvalds extern rwlock_t tasklist_lock;
2591da177e4SLinus Torvalds extern spinlock_t mmlist_lock;
2601da177e4SLinus Torvalds 
26136c8b586SIngo Molnar struct task_struct;
2621da177e4SLinus Torvalds 
263db1466b3SPaul E. McKenney #ifdef CONFIG_PROVE_RCU
264db1466b3SPaul E. McKenney extern int lockdep_tasklist_lock_is_held(void);
265db1466b3SPaul E. McKenney #endif /* #ifdef CONFIG_PROVE_RCU */
266db1466b3SPaul E. McKenney 
2671da177e4SLinus Torvalds extern void sched_init(void);
2681da177e4SLinus Torvalds extern void sched_init_smp(void);
2692d07b255SHarvey Harrison extern asmlinkage void schedule_tail(struct task_struct *prev);
27036c8b586SIngo Molnar extern void init_idle(struct task_struct *idle, int cpu);
2711df21055SIngo Molnar extern void init_idle_bootup_task(struct task_struct *idle);
2721da177e4SLinus Torvalds 
27389f19f04SAndrew Morton extern int runqueue_is_locked(int cpu);
274017730c1SIngo Molnar 
27546cb4b7cSSiddha, Suresh B #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
27683cd4fe2SVenkatesh Pallipadi extern void select_nohz_load_balancer(int stop_tick);
27769e1e811SSuresh Siddha extern void set_cpu_sd_state_idle(void);
27883cd4fe2SVenkatesh Pallipadi extern int get_nohz_timer_target(void);
27946cb4b7cSSiddha, Suresh B #else
28083cd4fe2SVenkatesh Pallipadi static inline void select_nohz_load_balancer(int stop_tick) { }
281fdaabd80SPeter Zijlstra static inline void set_cpu_sd_state_idle(void) { }
28246cb4b7cSSiddha, Suresh B #endif
2831da177e4SLinus Torvalds 
284e59e2ae2SIngo Molnar /*
28539bc89fdSIngo Molnar  * Only dump TASK_* tasks. (0 for all tasks)
286e59e2ae2SIngo Molnar  */
287e59e2ae2SIngo Molnar extern void show_state_filter(unsigned long state_filter);
288e59e2ae2SIngo Molnar 
289e59e2ae2SIngo Molnar static inline void show_state(void)
290e59e2ae2SIngo Molnar {
29139bc89fdSIngo Molnar 	show_state_filter(0);
292e59e2ae2SIngo Molnar }
293e59e2ae2SIngo Molnar 
2941da177e4SLinus Torvalds extern void show_regs(struct pt_regs *);
2951da177e4SLinus Torvalds 
2961da177e4SLinus Torvalds /*
2971da177e4SLinus Torvalds  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
2981da177e4SLinus Torvalds  * task), SP is the stack pointer of the first frame that should be shown in the back
2991da177e4SLinus Torvalds  * trace (or NULL if the entire call-chain of the task should be shown).
3001da177e4SLinus Torvalds  */
3011da177e4SLinus Torvalds extern void show_stack(struct task_struct *task, unsigned long *sp);
3021da177e4SLinus Torvalds 
3031da177e4SLinus Torvalds void io_schedule(void);
3041da177e4SLinus Torvalds long io_schedule_timeout(long timeout);
3051da177e4SLinus Torvalds 
3061da177e4SLinus Torvalds extern void cpu_init (void);
3071da177e4SLinus Torvalds extern void trap_init(void);
3081da177e4SLinus Torvalds extern void update_process_times(int user);
3091da177e4SLinus Torvalds extern void scheduler_tick(void);
3101da177e4SLinus Torvalds 
31182a1fcb9SIngo Molnar extern void sched_show_task(struct task_struct *p);
31282a1fcb9SIngo Molnar 
31319cc36c0SFrederic Weisbecker #ifdef CONFIG_LOCKUP_DETECTOR
3148446f1d3SIngo Molnar extern void touch_softlockup_watchdog(void);
315d6ad3e28SJason Wessel extern void touch_softlockup_watchdog_sync(void);
31604c9167fSJeremy Fitzhardinge extern void touch_all_softlockup_watchdogs(void);
317332fbdbcSDon Zickus extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
3188d65af78SAlexey Dobriyan 				  void __user *buffer,
319baf48f65SMandeep Singh Baines 				  size_t *lenp, loff_t *ppos);
3209c44bc03SIngo Molnar extern unsigned int  softlockup_panic;
321004417a6SPeter Zijlstra void lockup_detector_init(void);
3228446f1d3SIngo Molnar #else
3238446f1d3SIngo Molnar static inline void touch_softlockup_watchdog(void)
3248446f1d3SIngo Molnar {
3258446f1d3SIngo Molnar }
326d6ad3e28SJason Wessel static inline void touch_softlockup_watchdog_sync(void)
327d6ad3e28SJason Wessel {
328d6ad3e28SJason Wessel }
32904c9167fSJeremy Fitzhardinge static inline void touch_all_softlockup_watchdogs(void)
33004c9167fSJeremy Fitzhardinge {
33104c9167fSJeremy Fitzhardinge }
332004417a6SPeter Zijlstra static inline void lockup_detector_init(void)
333004417a6SPeter Zijlstra {
334004417a6SPeter Zijlstra }
3358446f1d3SIngo Molnar #endif
3368446f1d3SIngo Molnar 
337e162b39aSMandeep Singh Baines #ifdef CONFIG_DETECT_HUNG_TASK
338e162b39aSMandeep Singh Baines extern unsigned int  sysctl_hung_task_panic;
339e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_check_count;
340e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_timeout_secs;
341e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_warnings;
342e162b39aSMandeep Singh Baines extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
3438d65af78SAlexey Dobriyan 					 void __user *buffer,
344e162b39aSMandeep Singh Baines 					 size_t *lenp, loff_t *ppos);
345e4ecda1bSMark Lord #else
346e4ecda1bSMark Lord /* Avoid need for ifdefs elsewhere in the code */
347e4ecda1bSMark Lord enum { sysctl_hung_task_timeout_secs = 0 };
348e162b39aSMandeep Singh Baines #endif
3498446f1d3SIngo Molnar 
3501da177e4SLinus Torvalds /* Attach to any functions which should be ignored in wchan output. */
3511da177e4SLinus Torvalds #define __sched		__attribute__((__section__(".sched.text")))
352deaf2227SIngo Molnar 
353deaf2227SIngo Molnar /* Linker adds these: start and end of __sched functions */
354deaf2227SIngo Molnar extern char __sched_text_start[], __sched_text_end[];
355deaf2227SIngo Molnar 
3561da177e4SLinus Torvalds /* Is this address in the __sched functions? */
3571da177e4SLinus Torvalds extern int in_sched_functions(unsigned long addr);
3581da177e4SLinus Torvalds 
3591da177e4SLinus Torvalds #define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
360b3c97528SHarvey Harrison extern signed long schedule_timeout(signed long timeout);
36164ed93a2SNishanth Aravamudan extern signed long schedule_timeout_interruptible(signed long timeout);
362294d5cc2SMatthew Wilcox extern signed long schedule_timeout_killable(signed long timeout);
36364ed93a2SNishanth Aravamudan extern signed long schedule_timeout_uninterruptible(signed long timeout);
3641da177e4SLinus Torvalds asmlinkage void schedule(void);
365c5491ea7SThomas Gleixner extern void schedule_preempt_disabled(void);
366c6eb3ddaSPeter Zijlstra extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);
3671da177e4SLinus Torvalds 
368ab516013SSerge E. Hallyn struct nsproxy;
369acce292cSCedric Le Goater struct user_namespace;
3701da177e4SLinus Torvalds 
371341c87bfSKAMEZAWA Hiroyuki /*
372341c87bfSKAMEZAWA Hiroyuki  * Default maximum number of active map areas, this limits the number of vmas
373341c87bfSKAMEZAWA Hiroyuki  * per mm struct. Users can overwrite this number by sysctl but there is a
374341c87bfSKAMEZAWA Hiroyuki  * problem.
375341c87bfSKAMEZAWA Hiroyuki  *
376341c87bfSKAMEZAWA Hiroyuki  * When a program's coredump is generated as ELF format, a section is created
377341c87bfSKAMEZAWA Hiroyuki  * per a vma. In ELF, the number of sections is represented in unsigned short.
378341c87bfSKAMEZAWA Hiroyuki  * This means the number of sections should be smaller than 65535 at coredump.
379341c87bfSKAMEZAWA Hiroyuki  * Because the kernel adds some informative sections to a image of program at
380341c87bfSKAMEZAWA Hiroyuki  * generating coredump, we need some margin. The number of extra sections is
381341c87bfSKAMEZAWA Hiroyuki  * 1-3 now and depends on arch. We use "5" as safe margin, here.
382341c87bfSKAMEZAWA Hiroyuki  */
383341c87bfSKAMEZAWA Hiroyuki #define MAPCOUNT_ELF_CORE_MARGIN	(5)
3844be929beSAlexey Dobriyan #define DEFAULT_MAX_MAP_COUNT	(USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
3851da177e4SLinus Torvalds 
3861da177e4SLinus Torvalds extern int sysctl_max_map_count;
3871da177e4SLinus Torvalds 
3881da177e4SLinus Torvalds #include <linux/aio.h>
3891da177e4SLinus Torvalds 
390efc1a3b1SDavid Howells #ifdef CONFIG_MMU
391efc1a3b1SDavid Howells extern void arch_pick_mmap_layout(struct mm_struct *mm);
3921da177e4SLinus Torvalds extern unsigned long
3931da177e4SLinus Torvalds arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
3941da177e4SLinus Torvalds 		       unsigned long, unsigned long);
3951da177e4SLinus Torvalds extern unsigned long
3961da177e4SLinus Torvalds arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
3971da177e4SLinus Torvalds 			  unsigned long len, unsigned long pgoff,
3981da177e4SLinus Torvalds 			  unsigned long flags);
3991363c3cdSWolfgang Wander extern void arch_unmap_area(struct mm_struct *, unsigned long);
4001363c3cdSWolfgang Wander extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
401efc1a3b1SDavid Howells #else
402efc1a3b1SDavid Howells static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
403efc1a3b1SDavid Howells #endif
4041da177e4SLinus Torvalds 
405901608d9SOleg Nesterov 
4066c5d5238SKawai, Hidehiro extern void set_dumpable(struct mm_struct *mm, int value);
4076c5d5238SKawai, Hidehiro extern int get_dumpable(struct mm_struct *mm);
4086c5d5238SKawai, Hidehiro 
4096c5d5238SKawai, Hidehiro /* mm flags */
4103cb4a0bbSKawai, Hidehiro /* dumpable bits */
4116c5d5238SKawai, Hidehiro #define MMF_DUMPABLE      0  /* core dump is permitted */
4126c5d5238SKawai, Hidehiro #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
413f8af4da3SHugh Dickins 
4143cb4a0bbSKawai, Hidehiro #define MMF_DUMPABLE_BITS 2
415f8af4da3SHugh Dickins #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
4163cb4a0bbSKawai, Hidehiro 
4173cb4a0bbSKawai, Hidehiro /* coredump filter bits */
4183cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_PRIVATE	2
4193cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_SHARED	3
4203cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_PRIVATE	4
4213cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_SHARED	5
42282df3973SRoland McGrath #define MMF_DUMP_ELF_HEADERS	6
423e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_PRIVATE 7
424e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_SHARED  8
425f8af4da3SHugh Dickins 
4263cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS
427e575f111SKOSAKI Motohiro #define MMF_DUMP_FILTER_BITS	7
4283cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_MASK \
4293cb4a0bbSKawai, Hidehiro 	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
4303cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_DEFAULT \
431e575f111SKOSAKI Motohiro 	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\
432656eb2cdSRoland McGrath 	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
433656eb2cdSRoland McGrath 
434656eb2cdSRoland McGrath #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
435656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
436656eb2cdSRoland McGrath #else
437656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF	0
438656eb2cdSRoland McGrath #endif
439f8af4da3SHugh Dickins 					/* leave room for more dump flags */
440f8af4da3SHugh Dickins #define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */
441ba76149fSAndrea Arcangeli #define MMF_VM_HUGEPAGE		17	/* set when VM_HUGEPAGE is set on vma */
442bafb282dSKonstantin Khlebnikov #define MMF_EXE_FILE_CHANGED	18	/* see prctl_set_mm_exe_file() */
443f8af4da3SHugh Dickins 
444f8af4da3SHugh Dickins #define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
4456c5d5238SKawai, Hidehiro 
4461da177e4SLinus Torvalds struct sighand_struct {
4471da177e4SLinus Torvalds 	atomic_t		count;
4481da177e4SLinus Torvalds 	struct k_sigaction	action[_NSIG];
4491da177e4SLinus Torvalds 	spinlock_t		siglock;
450b8fceee1SDavide Libenzi 	wait_queue_head_t	signalfd_wqh;
4511da177e4SLinus Torvalds };
4521da177e4SLinus Torvalds 
4530e464814SKaiGai Kohei struct pacct_struct {
454f6ec29a4SKaiGai Kohei 	int			ac_flag;
455f6ec29a4SKaiGai Kohei 	long			ac_exitcode;
4560e464814SKaiGai Kohei 	unsigned long		ac_mem;
45777787bfbSKaiGai Kohei 	cputime_t		ac_utime, ac_stime;
45877787bfbSKaiGai Kohei 	unsigned long		ac_minflt, ac_majflt;
4590e464814SKaiGai Kohei };
4600e464814SKaiGai Kohei 
46142c4ab41SStanislaw Gruszka struct cpu_itimer {
46242c4ab41SStanislaw Gruszka 	cputime_t expires;
46342c4ab41SStanislaw Gruszka 	cputime_t incr;
4648356b5f9SStanislaw Gruszka 	u32 error;
4658356b5f9SStanislaw Gruszka 	u32 incr_error;
46642c4ab41SStanislaw Gruszka };
46742c4ab41SStanislaw Gruszka 
468f06febc9SFrank Mayhar /**
469f06febc9SFrank Mayhar  * struct task_cputime - collected CPU time counts
470f06febc9SFrank Mayhar  * @utime:		time spent in user mode, in &cputime_t units
471f06febc9SFrank Mayhar  * @stime:		time spent in kernel mode, in &cputime_t units
472f06febc9SFrank Mayhar  * @sum_exec_runtime:	total time spent on the CPU, in nanoseconds
473f06febc9SFrank Mayhar  *
474f06febc9SFrank Mayhar  * This structure groups together three kinds of CPU time that are
475f06febc9SFrank Mayhar  * tracked for threads and thread groups.  Most things considering
476f06febc9SFrank Mayhar  * CPU time want to group these counts together and treat all three
477f06febc9SFrank Mayhar  * of them in parallel.
478f06febc9SFrank Mayhar  */
479f06febc9SFrank Mayhar struct task_cputime {
480f06febc9SFrank Mayhar 	cputime_t utime;
481f06febc9SFrank Mayhar 	cputime_t stime;
482f06febc9SFrank Mayhar 	unsigned long long sum_exec_runtime;
483f06febc9SFrank Mayhar };
484f06febc9SFrank Mayhar /* Alternate field names when used to cache expirations. */
485f06febc9SFrank Mayhar #define prof_exp	stime
486f06febc9SFrank Mayhar #define virt_exp	utime
487f06febc9SFrank Mayhar #define sched_exp	sum_exec_runtime
488f06febc9SFrank Mayhar 
4894cd4c1b4SPeter Zijlstra #define INIT_CPUTIME	\
4904cd4c1b4SPeter Zijlstra 	(struct task_cputime) {					\
49164861634SMartin Schwidefsky 		.utime = 0,					\
49264861634SMartin Schwidefsky 		.stime = 0,					\
4934cd4c1b4SPeter Zijlstra 		.sum_exec_runtime = 0,				\
4944cd4c1b4SPeter Zijlstra 	}
4954cd4c1b4SPeter Zijlstra 
496c99e6efeSPeter Zijlstra /*
497c99e6efeSPeter Zijlstra  * Disable preemption until the scheduler is running.
498c99e6efeSPeter Zijlstra  * Reset by start_kernel()->sched_init()->init_idle().
499d86ee480SPeter Zijlstra  *
500d86ee480SPeter Zijlstra  * We include PREEMPT_ACTIVE to avoid cond_resched() from working
501d86ee480SPeter Zijlstra  * before the scheduler is active -- see should_resched().
502c99e6efeSPeter Zijlstra  */
503d86ee480SPeter Zijlstra #define INIT_PREEMPT_COUNT	(1 + PREEMPT_ACTIVE)
504c99e6efeSPeter Zijlstra 
505f06febc9SFrank Mayhar /**
5064cd4c1b4SPeter Zijlstra  * struct thread_group_cputimer - thread group interval timer counts
5074cd4c1b4SPeter Zijlstra  * @cputime:		thread group interval timers.
5084cd4c1b4SPeter Zijlstra  * @running:		non-zero when there are timers running and
5094cd4c1b4SPeter Zijlstra  * 			@cputime receives updates.
5104cd4c1b4SPeter Zijlstra  * @lock:		lock for fields in this struct.
511f06febc9SFrank Mayhar  *
512f06febc9SFrank Mayhar  * This structure contains the version of task_cputime, above, that is
5134cd4c1b4SPeter Zijlstra  * used for thread group CPU timer calculations.
514f06febc9SFrank Mayhar  */
5154cd4c1b4SPeter Zijlstra struct thread_group_cputimer {
5164cd4c1b4SPeter Zijlstra 	struct task_cputime cputime;
5174cd4c1b4SPeter Zijlstra 	int running;
518ee30a7b2SThomas Gleixner 	raw_spinlock_t lock;
519f06febc9SFrank Mayhar };
520f06febc9SFrank Mayhar 
5214714d1d3SBen Blum #include <linux/rwsem.h>
5225091faa4SMike Galbraith struct autogroup;
5235091faa4SMike Galbraith 
5241da177e4SLinus Torvalds /*
525e815f0a8SJonathan Neuschäfer  * NOTE! "signal_struct" does not have its own
5261da177e4SLinus Torvalds  * locking, because a shared signal_struct always
5271da177e4SLinus Torvalds  * implies a shared sighand_struct, so locking
5281da177e4SLinus Torvalds  * sighand_struct is always a proper superset of
5291da177e4SLinus Torvalds  * the locking of signal_struct.
5301da177e4SLinus Torvalds  */
5311da177e4SLinus Torvalds struct signal_struct {
532ea6d290cSOleg Nesterov 	atomic_t		sigcnt;
5331da177e4SLinus Torvalds 	atomic_t		live;
534b3ac022cSOleg Nesterov 	int			nr_threads;
5351da177e4SLinus Torvalds 
5361da177e4SLinus Torvalds 	wait_queue_head_t	wait_chldexit;	/* for wait4() */
5371da177e4SLinus Torvalds 
5381da177e4SLinus Torvalds 	/* current thread group signal load-balancing target: */
53936c8b586SIngo Molnar 	struct task_struct	*curr_target;
5401da177e4SLinus Torvalds 
5411da177e4SLinus Torvalds 	/* shared signal handling: */
5421da177e4SLinus Torvalds 	struct sigpending	shared_pending;
5431da177e4SLinus Torvalds 
5441da177e4SLinus Torvalds 	/* thread group exit support */
5451da177e4SLinus Torvalds 	int			group_exit_code;
5461da177e4SLinus Torvalds 	/* overloaded:
5471da177e4SLinus Torvalds 	 * - notify group_exit_task when ->count is equal to notify_count
5481da177e4SLinus Torvalds 	 * - everyone except group_exit_task is stopped during signal delivery
5491da177e4SLinus Torvalds 	 *   of fatal signals, group_exit_task processes the signal.
5501da177e4SLinus Torvalds 	 */
5511da177e4SLinus Torvalds 	int			notify_count;
55207dd20e0SRichard Kennedy 	struct task_struct	*group_exit_task;
5531da177e4SLinus Torvalds 
5541da177e4SLinus Torvalds 	/* thread group stop support, overloads group_exit_code too */
5551da177e4SLinus Torvalds 	int			group_stop_count;
5561da177e4SLinus Torvalds 	unsigned int		flags; /* see SIGNAL_* flags below */
5571da177e4SLinus Torvalds 
558ebec18a6SLennart Poettering 	/*
559ebec18a6SLennart Poettering 	 * PR_SET_CHILD_SUBREAPER marks a process, like a service
560ebec18a6SLennart Poettering 	 * manager, to re-parent orphan (double-forking) child processes
561ebec18a6SLennart Poettering 	 * to this process instead of 'init'. The service manager is
562ebec18a6SLennart Poettering 	 * able to receive SIGCHLD signals and is able to investigate
563ebec18a6SLennart Poettering 	 * the process until it calls wait(). All children of this
564ebec18a6SLennart Poettering 	 * process will inherit a flag if they should look for a
565ebec18a6SLennart Poettering 	 * child_subreaper process at exit.
566ebec18a6SLennart Poettering 	 */
567ebec18a6SLennart Poettering 	unsigned int		is_child_subreaper:1;
568ebec18a6SLennart Poettering 	unsigned int		has_child_subreaper:1;
569ebec18a6SLennart Poettering 
5701da177e4SLinus Torvalds 	/* POSIX.1b Interval Timers */
5711da177e4SLinus Torvalds 	struct list_head posix_timers;
5721da177e4SLinus Torvalds 
5731da177e4SLinus Torvalds 	/* ITIMER_REAL timer for the process */
5742ff678b8SThomas Gleixner 	struct hrtimer real_timer;
575fea9d175SOleg Nesterov 	struct pid *leader_pid;
5762ff678b8SThomas Gleixner 	ktime_t it_real_incr;
5771da177e4SLinus Torvalds 
57842c4ab41SStanislaw Gruszka 	/*
57942c4ab41SStanislaw Gruszka 	 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
58042c4ab41SStanislaw Gruszka 	 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
58142c4ab41SStanislaw Gruszka 	 * values are defined to 0 and 1 respectively
58242c4ab41SStanislaw Gruszka 	 */
58342c4ab41SStanislaw Gruszka 	struct cpu_itimer it[2];
5841da177e4SLinus Torvalds 
585f06febc9SFrank Mayhar 	/*
5864cd4c1b4SPeter Zijlstra 	 * Thread group totals for process CPU timers.
5874cd4c1b4SPeter Zijlstra 	 * See thread_group_cputimer(), et al, for details.
588f06febc9SFrank Mayhar 	 */
5894cd4c1b4SPeter Zijlstra 	struct thread_group_cputimer cputimer;
590f06febc9SFrank Mayhar 
591f06febc9SFrank Mayhar 	/* Earliest-expiration cache. */
592f06febc9SFrank Mayhar 	struct task_cputime cputime_expires;
593f06febc9SFrank Mayhar 
594f06febc9SFrank Mayhar 	struct list_head cpu_timers[3];
595f06febc9SFrank Mayhar 
596ab521dc0SEric W. Biederman 	struct pid *tty_old_pgrp;
5971ec320afSCedric Le Goater 
5981da177e4SLinus Torvalds 	/* boolean value for session group leader */
5991da177e4SLinus Torvalds 	int leader;
6001da177e4SLinus Torvalds 
6011da177e4SLinus Torvalds 	struct tty_struct *tty; /* NULL if no tty */
6021da177e4SLinus Torvalds 
6035091faa4SMike Galbraith #ifdef CONFIG_SCHED_AUTOGROUP
6045091faa4SMike Galbraith 	struct autogroup *autogroup;
6055091faa4SMike Galbraith #endif
6061da177e4SLinus Torvalds 	/*
6071da177e4SLinus Torvalds 	 * Cumulative resource counters for dead threads in the group,
6081da177e4SLinus Torvalds 	 * and for reaped dead child processes forked by this group.
6091da177e4SLinus Torvalds 	 * Live threads maintain their own counters and add to these
6101da177e4SLinus Torvalds 	 * in __exit_signal, except for the group leader.
6111da177e4SLinus Torvalds 	 */
61232bd671dSPeter Zijlstra 	cputime_t utime, stime, cutime, cstime;
6139ac52315SLaurent Vivier 	cputime_t gtime;
6149ac52315SLaurent Vivier 	cputime_t cgtime;
6150cf55e1eSHidetoshi Seto #ifndef CONFIG_VIRT_CPU_ACCOUNTING
6160cf55e1eSHidetoshi Seto 	cputime_t prev_utime, prev_stime;
6170cf55e1eSHidetoshi Seto #endif
6181da177e4SLinus Torvalds 	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
6191da177e4SLinus Torvalds 	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
6206eaeeabaSEric Dumazet 	unsigned long inblock, oublock, cinblock, coublock;
6211f10206cSJiri Pirko 	unsigned long maxrss, cmaxrss;
622940389b8SAndrea Righi 	struct task_io_accounting ioac;
6231da177e4SLinus Torvalds 
6241da177e4SLinus Torvalds 	/*
62532bd671dSPeter Zijlstra 	 * Cumulative ns of schedule CPU time fo dead threads in the
62632bd671dSPeter Zijlstra 	 * group, not including a zombie group leader, (This only differs
62732bd671dSPeter Zijlstra 	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
62832bd671dSPeter Zijlstra 	 * other than jiffies.)
62932bd671dSPeter Zijlstra 	 */
63032bd671dSPeter Zijlstra 	unsigned long long sum_sched_runtime;
63132bd671dSPeter Zijlstra 
63232bd671dSPeter Zijlstra 	/*
6331da177e4SLinus Torvalds 	 * We don't bother to synchronize most readers of this at all,
6341da177e4SLinus Torvalds 	 * because there is no reader checking a limit that actually needs
6351da177e4SLinus Torvalds 	 * to get both rlim_cur and rlim_max atomically, and either one
6361da177e4SLinus Torvalds 	 * alone is a single word that can safely be read normally.
6371da177e4SLinus Torvalds 	 * getrlimit/setrlimit use task_lock(current->group_leader) to
6381da177e4SLinus Torvalds 	 * protect this instead of the siglock, because they really
6391da177e4SLinus Torvalds 	 * have no need to disable irqs.
6401da177e4SLinus Torvalds 	 */
6411da177e4SLinus Torvalds 	struct rlimit rlim[RLIM_NLIMITS];
6421da177e4SLinus Torvalds 
6430e464814SKaiGai Kohei #ifdef CONFIG_BSD_PROCESS_ACCT
6440e464814SKaiGai Kohei 	struct pacct_struct pacct;	/* per-process accounting information */
6450e464814SKaiGai Kohei #endif
646ad4ecbcbSShailabh Nagar #ifdef CONFIG_TASKSTATS
647ad4ecbcbSShailabh Nagar 	struct taskstats *stats;
648ad4ecbcbSShailabh Nagar #endif
649522ed776SMiloslav Trmac #ifdef CONFIG_AUDIT
650522ed776SMiloslav Trmac 	unsigned audit_tty;
651522ed776SMiloslav Trmac 	struct tty_audit_buf *tty_audit_buf;
652522ed776SMiloslav Trmac #endif
6534714d1d3SBen Blum #ifdef CONFIG_CGROUPS
6544714d1d3SBen Blum 	/*
65577e4ef99STejun Heo 	 * group_rwsem prevents new tasks from entering the threadgroup and
65677e4ef99STejun Heo 	 * member tasks from exiting,a more specifically, setting of
65777e4ef99STejun Heo 	 * PF_EXITING.  fork and exit paths are protected with this rwsem
65877e4ef99STejun Heo 	 * using threadgroup_change_begin/end().  Users which require
65977e4ef99STejun Heo 	 * threadgroup to remain stable should use threadgroup_[un]lock()
66077e4ef99STejun Heo 	 * which also takes care of exec path.  Currently, cgroup is the
66177e4ef99STejun Heo 	 * only user.
6624714d1d3SBen Blum 	 */
663257058aeSTejun Heo 	struct rw_semaphore group_rwsem;
6644714d1d3SBen Blum #endif
66528b83c51SKOSAKI Motohiro 
66628b83c51SKOSAKI Motohiro 	int oom_adj;		/* OOM kill score adjustment (bit shift) */
667a63d83f4SDavid Rientjes 	int oom_score_adj;	/* OOM kill score adjustment */
668dabb16f6SMandeep Singh Baines 	int oom_score_adj_min;	/* OOM kill score adjustment minimum value.
669dabb16f6SMandeep Singh Baines 				 * Only settable by CAP_SYS_RESOURCE. */
6709b1bf12dSKOSAKI Motohiro 
6719b1bf12dSKOSAKI Motohiro 	struct mutex cred_guard_mutex;	/* guard against foreign influences on
6729b1bf12dSKOSAKI Motohiro 					 * credential calculations
6739b1bf12dSKOSAKI Motohiro 					 * (notably. ptrace) */
6741da177e4SLinus Torvalds };
6751da177e4SLinus Torvalds 
6764866cde0SNick Piggin /* Context switch must be unlocked if interrupts are to be enabled */
6774866cde0SNick Piggin #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
6784866cde0SNick Piggin # define __ARCH_WANT_UNLOCKED_CTXSW
6794866cde0SNick Piggin #endif
6804866cde0SNick Piggin 
6811da177e4SLinus Torvalds /*
6821da177e4SLinus Torvalds  * Bits in flags field of signal_struct.
6831da177e4SLinus Torvalds  */
6841da177e4SLinus Torvalds #define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */
685ee77f075SOleg Nesterov #define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */
686ee77f075SOleg Nesterov #define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */
687e4420551SOleg Nesterov /*
688e4420551SOleg Nesterov  * Pending notifications to parent.
689e4420551SOleg Nesterov  */
690e4420551SOleg Nesterov #define SIGNAL_CLD_STOPPED	0x00000010
691e4420551SOleg Nesterov #define SIGNAL_CLD_CONTINUED	0x00000020
692e4420551SOleg Nesterov #define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
6931da177e4SLinus Torvalds 
694fae5fa44SOleg Nesterov #define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */
695fae5fa44SOleg Nesterov 
696ed5d2cacSOleg Nesterov /* If true, all threads except ->group_exit_task have pending SIGKILL */
697ed5d2cacSOleg Nesterov static inline int signal_group_exit(const struct signal_struct *sig)
698ed5d2cacSOleg Nesterov {
699ed5d2cacSOleg Nesterov 	return	(sig->flags & SIGNAL_GROUP_EXIT) ||
700ed5d2cacSOleg Nesterov 		(sig->group_exit_task != NULL);
701ed5d2cacSOleg Nesterov }
702ed5d2cacSOleg Nesterov 
7031da177e4SLinus Torvalds /*
7041da177e4SLinus Torvalds  * Some day this will be a full-fledged user tracking system..
7051da177e4SLinus Torvalds  */
7061da177e4SLinus Torvalds struct user_struct {
7071da177e4SLinus Torvalds 	atomic_t __count;	/* reference count */
7081da177e4SLinus Torvalds 	atomic_t processes;	/* How many processes does this user have? */
7091da177e4SLinus Torvalds 	atomic_t files;		/* How many open files does this user have? */
7101da177e4SLinus Torvalds 	atomic_t sigpending;	/* How many pending signals does this user have? */
7112d9048e2SAmy Griffis #ifdef CONFIG_INOTIFY_USER
7120eeca283SRobert Love 	atomic_t inotify_watches; /* How many inotify watches does this user have? */
7130eeca283SRobert Love 	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
7140eeca283SRobert Love #endif
7154afeff85SEric Paris #ifdef CONFIG_FANOTIFY
7164afeff85SEric Paris 	atomic_t fanotify_listeners;
7174afeff85SEric Paris #endif
7187ef9964eSDavide Libenzi #ifdef CONFIG_EPOLL
71952bd19f7SRobin Holt 	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
7207ef9964eSDavide Libenzi #endif
721970a8645SAlexey Dobriyan #ifdef CONFIG_POSIX_MQUEUE
7221da177e4SLinus Torvalds 	/* protected by mq_lock	*/
7231da177e4SLinus Torvalds 	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
724970a8645SAlexey Dobriyan #endif
7251da177e4SLinus Torvalds 	unsigned long locked_shm; /* How many pages of mlocked shm ? */
7261da177e4SLinus Torvalds 
7271da177e4SLinus Torvalds #ifdef CONFIG_KEYS
7281da177e4SLinus Torvalds 	struct key *uid_keyring;	/* UID specific keyring */
7291da177e4SLinus Torvalds 	struct key *session_keyring;	/* UID's default session keyring */
7301da177e4SLinus Torvalds #endif
7311da177e4SLinus Torvalds 
7321da177e4SLinus Torvalds 	/* Hash table maintenance information */
733735de223SPavel Emelyanov 	struct hlist_node uidhash_node;
7347b44ab97SEric W. Biederman 	kuid_t uid;
73524e377a8SSrivatsa Vaddagiri 
736cdd6c482SIngo Molnar #ifdef CONFIG_PERF_EVENTS
737789f90fcSPeter Zijlstra 	atomic_long_t locked_vm;
738789f90fcSPeter Zijlstra #endif
7391da177e4SLinus Torvalds };
7401da177e4SLinus Torvalds 
741eb41d946SKay Sievers extern int uids_sysfs_init(void);
7425cb350baSDhaval Giani 
7437b44ab97SEric W. Biederman extern struct user_struct *find_user(kuid_t);
7441da177e4SLinus Torvalds 
7451da177e4SLinus Torvalds extern struct user_struct root_user;
7461da177e4SLinus Torvalds #define INIT_USER (&root_user)
7471da177e4SLinus Torvalds 
748b6dff3ecSDavid Howells 
7491da177e4SLinus Torvalds struct backing_dev_info;
7501da177e4SLinus Torvalds struct reclaim_state;
7511da177e4SLinus Torvalds 
75252f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
7531da177e4SLinus Torvalds struct sched_info {
7541da177e4SLinus Torvalds 	/* cumulative counters */
7552d72376bSIngo Molnar 	unsigned long pcount;	      /* # of times run on this cpu */
7569c2c4802SKen Chen 	unsigned long long run_delay; /* time spent waiting on a runqueue */
7571da177e4SLinus Torvalds 
7581da177e4SLinus Torvalds 	/* timestamps */
759172ba844SBalbir Singh 	unsigned long long last_arrival,/* when we last ran on a cpu */
7601da177e4SLinus Torvalds 			   last_queued;	/* when we were last queued to run */
7611da177e4SLinus Torvalds };
76252f17b6cSChandra Seetharaman #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
7631da177e4SLinus Torvalds 
764ca74e92bSShailabh Nagar #ifdef CONFIG_TASK_DELAY_ACCT
765ca74e92bSShailabh Nagar struct task_delay_info {
766ca74e92bSShailabh Nagar 	spinlock_t	lock;
767ca74e92bSShailabh Nagar 	unsigned int	flags;	/* Private per-task flags */
768ca74e92bSShailabh Nagar 
769ca74e92bSShailabh Nagar 	/* For each stat XXX, add following, aligned appropriately
770ca74e92bSShailabh Nagar 	 *
771ca74e92bSShailabh Nagar 	 * struct timespec XXX_start, XXX_end;
772ca74e92bSShailabh Nagar 	 * u64 XXX_delay;
773ca74e92bSShailabh Nagar 	 * u32 XXX_count;
774ca74e92bSShailabh Nagar 	 *
775ca74e92bSShailabh Nagar 	 * Atomicity of updates to XXX_delay, XXX_count protected by
776ca74e92bSShailabh Nagar 	 * single lock above (split into XXX_lock if contention is an issue).
777ca74e92bSShailabh Nagar 	 */
7780ff92245SShailabh Nagar 
7790ff92245SShailabh Nagar 	/*
7800ff92245SShailabh Nagar 	 * XXX_count is incremented on every XXX operation, the delay
7810ff92245SShailabh Nagar 	 * associated with the operation is added to XXX_delay.
7820ff92245SShailabh Nagar 	 * XXX_delay contains the accumulated delay time in nanoseconds.
7830ff92245SShailabh Nagar 	 */
7840ff92245SShailabh Nagar 	struct timespec blkio_start, blkio_end;	/* Shared by blkio, swapin */
7850ff92245SShailabh Nagar 	u64 blkio_delay;	/* wait for sync block io completion */
7860ff92245SShailabh Nagar 	u64 swapin_delay;	/* wait for swapin block io completion */
7870ff92245SShailabh Nagar 	u32 blkio_count;	/* total count of the number of sync block */
7880ff92245SShailabh Nagar 				/* io operations performed */
7890ff92245SShailabh Nagar 	u32 swapin_count;	/* total count of the number of swapin block */
7900ff92245SShailabh Nagar 				/* io operations performed */
791873b4771SKeika Kobayashi 
792873b4771SKeika Kobayashi 	struct timespec freepages_start, freepages_end;
793873b4771SKeika Kobayashi 	u64 freepages_delay;	/* wait for memory reclaim */
794873b4771SKeika Kobayashi 	u32 freepages_count;	/* total count of memory reclaim */
795ca74e92bSShailabh Nagar };
79652f17b6cSChandra Seetharaman #endif	/* CONFIG_TASK_DELAY_ACCT */
79752f17b6cSChandra Seetharaman 
79852f17b6cSChandra Seetharaman static inline int sched_info_on(void)
79952f17b6cSChandra Seetharaman {
80052f17b6cSChandra Seetharaman #ifdef CONFIG_SCHEDSTATS
80152f17b6cSChandra Seetharaman 	return 1;
80252f17b6cSChandra Seetharaman #elif defined(CONFIG_TASK_DELAY_ACCT)
80352f17b6cSChandra Seetharaman 	extern int delayacct_on;
80452f17b6cSChandra Seetharaman 	return delayacct_on;
80552f17b6cSChandra Seetharaman #else
80652f17b6cSChandra Seetharaman 	return 0;
807ca74e92bSShailabh Nagar #endif
80852f17b6cSChandra Seetharaman }
809ca74e92bSShailabh Nagar 
810d15bcfdbSIngo Molnar enum cpu_idle_type {
811d15bcfdbSIngo Molnar 	CPU_IDLE,
812d15bcfdbSIngo Molnar 	CPU_NOT_IDLE,
813d15bcfdbSIngo Molnar 	CPU_NEWLY_IDLE,
814d15bcfdbSIngo Molnar 	CPU_MAX_IDLE_TYPES
8151da177e4SLinus Torvalds };
8161da177e4SLinus Torvalds 
8171da177e4SLinus Torvalds /*
818c8b28116SNikhil Rao  * Increase resolution of nice-level calculations for 64-bit architectures.
819c8b28116SNikhil Rao  * The extra resolution improves shares distribution and load balancing of
820c8b28116SNikhil Rao  * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
821c8b28116SNikhil Rao  * hierarchies, especially on larger systems. This is not a user-visible change
822c8b28116SNikhil Rao  * and does not change the user-interface for setting shares/weights.
823c8b28116SNikhil Rao  *
824c8b28116SNikhil Rao  * We increase resolution only if we have enough bits to allow this increased
825c8b28116SNikhil Rao  * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
826c8b28116SNikhil Rao  * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
827c8b28116SNikhil Rao  * increased costs.
8281da177e4SLinus Torvalds  */
829e4c2fb0dSPeter Zijlstra #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load  */
830c8b28116SNikhil Rao # define SCHED_LOAD_RESOLUTION	10
831c8b28116SNikhil Rao # define scale_load(w)		((w) << SCHED_LOAD_RESOLUTION)
832c8b28116SNikhil Rao # define scale_load_down(w)	((w) >> SCHED_LOAD_RESOLUTION)
833c8b28116SNikhil Rao #else
834c8b28116SNikhil Rao # define SCHED_LOAD_RESOLUTION	0
835c8b28116SNikhil Rao # define scale_load(w)		(w)
836c8b28116SNikhil Rao # define scale_load_down(w)	(w)
837c8b28116SNikhil Rao #endif
8389aa7b369SIngo Molnar 
839c8b28116SNikhil Rao #define SCHED_LOAD_SHIFT	(10 + SCHED_LOAD_RESOLUTION)
8409aa7b369SIngo Molnar #define SCHED_LOAD_SCALE	(1L << SCHED_LOAD_SHIFT)
8419aa7b369SIngo Molnar 
8421399fa78SNikhil Rao /*
8431399fa78SNikhil Rao  * Increase resolution of cpu_power calculations
8441399fa78SNikhil Rao  */
8451399fa78SNikhil Rao #define SCHED_POWER_SHIFT	10
8461399fa78SNikhil Rao #define SCHED_POWER_SCALE	(1L << SCHED_POWER_SHIFT)
8471da177e4SLinus Torvalds 
8481399fa78SNikhil Rao /*
8491399fa78SNikhil Rao  * sched-domains (multiprocessor balancing) declarations:
8501399fa78SNikhil Rao  */
8512dd73a4fSPeter Williams #ifdef CONFIG_SMP
852b5d978e0SPeter Zijlstra #define SD_LOAD_BALANCE		0x0001	/* Do load balancing on this domain. */
853b5d978e0SPeter Zijlstra #define SD_BALANCE_NEWIDLE	0x0002	/* Balance when about to become idle */
854b5d978e0SPeter Zijlstra #define SD_BALANCE_EXEC		0x0004	/* Balance on exec */
855b5d978e0SPeter Zijlstra #define SD_BALANCE_FORK		0x0008	/* Balance on fork, clone */
856c88d5910SPeter Zijlstra #define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */
857b5d978e0SPeter Zijlstra #define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */
85859abf026SPeter Zijlstra #define SD_PREFER_LOCAL		0x0040  /* Prefer to keep tasks local to this domain */
859b5d978e0SPeter Zijlstra #define SD_SHARE_CPUPOWER	0x0080	/* Domain members share cpu power */
860b5d978e0SPeter Zijlstra #define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
861b5d978e0SPeter Zijlstra #define SD_SERIALIZE		0x0400	/* Only a single load balancing instance */
862532cb4c4SMichael Neuling #define SD_ASYM_PACKING		0x0800  /* Place busy groups earlier in the domain */
863b5d978e0SPeter Zijlstra #define SD_PREFER_SIBLING	0x1000	/* Prefer to place tasks in a sibling domain */
864e3589f6cSPeter Zijlstra #define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */
8655c45bf27SSiddha, Suresh B 
866532cb4c4SMichael Neuling extern int __weak arch_sd_sibiling_asym_packing(void);
867532cb4c4SMichael Neuling 
8689c3f75cbSPeter Zijlstra struct sched_group_power {
869e3589f6cSPeter Zijlstra 	atomic_t ref;
8701da177e4SLinus Torvalds 	/*
8711da177e4SLinus Torvalds 	 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
87218a3885fSPeter Zijlstra 	 * single CPU.
8731da177e4SLinus Torvalds 	 */
8749c3f75cbSPeter Zijlstra 	unsigned int power, power_orig;
8754ec4412eSVincent Guittot 	unsigned long next_update;
87669e1e811SSuresh Siddha 	/*
87769e1e811SSuresh Siddha 	 * Number of busy cpus in this group.
87869e1e811SSuresh Siddha 	 */
87969e1e811SSuresh Siddha 	atomic_t nr_busy_cpus;
880c1174876SPeter Zijlstra 
881c1174876SPeter Zijlstra 	unsigned long cpumask[0]; /* iteration mask */
8829c3f75cbSPeter Zijlstra };
8839c3f75cbSPeter Zijlstra 
8849c3f75cbSPeter Zijlstra struct sched_group {
8859c3f75cbSPeter Zijlstra 	struct sched_group *next;	/* Must be a circular list */
8869c3f75cbSPeter Zijlstra 	atomic_t ref;
8879c3f75cbSPeter Zijlstra 
888aae6d3ddSSuresh Siddha 	unsigned int group_weight;
8899c3f75cbSPeter Zijlstra 	struct sched_group_power *sgp;
8906c99e9adSRusty Russell 
8914200efd9SIngo Molnar 	/*
8924200efd9SIngo Molnar 	 * The CPUs this group covers.
8934200efd9SIngo Molnar 	 *
8944200efd9SIngo Molnar 	 * NOTE: this field is variable length. (Allocated dynamically
8954200efd9SIngo Molnar 	 * by attaching extra space to the end of the structure,
8964200efd9SIngo Molnar 	 * depending on how many CPUs the kernel has booted up with)
8974200efd9SIngo Molnar 	 */
8984200efd9SIngo Molnar 	unsigned long cpumask[0];
8991da177e4SLinus Torvalds };
9001da177e4SLinus Torvalds 
901758b2cdcSRusty Russell static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
902758b2cdcSRusty Russell {
9036c99e9adSRusty Russell 	return to_cpumask(sg->cpumask);
904758b2cdcSRusty Russell }
905758b2cdcSRusty Russell 
906c1174876SPeter Zijlstra /*
907c1174876SPeter Zijlstra  * cpumask masking which cpus in the group are allowed to iterate up the domain
908c1174876SPeter Zijlstra  * tree.
909c1174876SPeter Zijlstra  */
910c1174876SPeter Zijlstra static inline struct cpumask *sched_group_mask(struct sched_group *sg)
911c1174876SPeter Zijlstra {
912c1174876SPeter Zijlstra 	return to_cpumask(sg->sgp->cpumask);
913c1174876SPeter Zijlstra }
914c1174876SPeter Zijlstra 
915029632fbSPeter Zijlstra /**
916029632fbSPeter Zijlstra  * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
917029632fbSPeter Zijlstra  * @group: The group whose first cpu is to be returned.
918029632fbSPeter Zijlstra  */
919029632fbSPeter Zijlstra static inline unsigned int group_first_cpu(struct sched_group *group)
920029632fbSPeter Zijlstra {
921029632fbSPeter Zijlstra 	return cpumask_first(sched_group_cpus(group));
922029632fbSPeter Zijlstra }
923029632fbSPeter Zijlstra 
9241d3504fcSHidetoshi Seto struct sched_domain_attr {
9251d3504fcSHidetoshi Seto 	int relax_domain_level;
9261d3504fcSHidetoshi Seto };
9271d3504fcSHidetoshi Seto 
9281d3504fcSHidetoshi Seto #define SD_ATTR_INIT	(struct sched_domain_attr) {	\
9291d3504fcSHidetoshi Seto 	.relax_domain_level = -1,			\
9301d3504fcSHidetoshi Seto }
9311d3504fcSHidetoshi Seto 
93260495e77SPeter Zijlstra extern int sched_domain_level_max;
93360495e77SPeter Zijlstra 
9341da177e4SLinus Torvalds struct sched_domain {
9351da177e4SLinus Torvalds 	/* These fields must be setup */
9361da177e4SLinus Torvalds 	struct sched_domain *parent;	/* top domain must be null terminated */
9371a848870SSiddha, Suresh B 	struct sched_domain *child;	/* bottom domain must be null terminated */
9381da177e4SLinus Torvalds 	struct sched_group *groups;	/* the balancing groups of the domain */
9391da177e4SLinus Torvalds 	unsigned long min_interval;	/* Minimum balance interval ms */
9401da177e4SLinus Torvalds 	unsigned long max_interval;	/* Maximum balance interval ms */
9411da177e4SLinus Torvalds 	unsigned int busy_factor;	/* less balancing by factor if busy */
9421da177e4SLinus Torvalds 	unsigned int imbalance_pct;	/* No balance until over watermark */
9431da177e4SLinus Torvalds 	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */
9447897986bSNick Piggin 	unsigned int busy_idx;
9457897986bSNick Piggin 	unsigned int idle_idx;
9467897986bSNick Piggin 	unsigned int newidle_idx;
9477897986bSNick Piggin 	unsigned int wake_idx;
948147cbb4bSNick Piggin 	unsigned int forkexec_idx;
949a52bfd73SPeter Zijlstra 	unsigned int smt_gain;
9501da177e4SLinus Torvalds 	int flags;			/* See SD_* */
95160495e77SPeter Zijlstra 	int level;
9521da177e4SLinus Torvalds 
9531da177e4SLinus Torvalds 	/* Runtime fields. */
9541da177e4SLinus Torvalds 	unsigned long last_balance;	/* init to jiffies. units in jiffies */
9551da177e4SLinus Torvalds 	unsigned int balance_interval;	/* initialise to 1. units in ms. */
9561da177e4SLinus Torvalds 	unsigned int nr_balance_failed; /* initialise to 0 */
9571da177e4SLinus Torvalds 
9582398f2c6SPeter Zijlstra 	u64 last_update;
9592398f2c6SPeter Zijlstra 
9601da177e4SLinus Torvalds #ifdef CONFIG_SCHEDSTATS
9611da177e4SLinus Torvalds 	/* load_balance() stats */
962480b9434SKen Chen 	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
963480b9434SKen Chen 	unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
964480b9434SKen Chen 	unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
965480b9434SKen Chen 	unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
966480b9434SKen Chen 	unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
967480b9434SKen Chen 	unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
968480b9434SKen Chen 	unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
969480b9434SKen Chen 	unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
9701da177e4SLinus Torvalds 
9711da177e4SLinus Torvalds 	/* Active load balancing */
972480b9434SKen Chen 	unsigned int alb_count;
973480b9434SKen Chen 	unsigned int alb_failed;
974480b9434SKen Chen 	unsigned int alb_pushed;
9751da177e4SLinus Torvalds 
97668767a0aSNick Piggin 	/* SD_BALANCE_EXEC stats */
977480b9434SKen Chen 	unsigned int sbe_count;
978480b9434SKen Chen 	unsigned int sbe_balanced;
979480b9434SKen Chen 	unsigned int sbe_pushed;
9801da177e4SLinus Torvalds 
98168767a0aSNick Piggin 	/* SD_BALANCE_FORK stats */
982480b9434SKen Chen 	unsigned int sbf_count;
983480b9434SKen Chen 	unsigned int sbf_balanced;
984480b9434SKen Chen 	unsigned int sbf_pushed;
98568767a0aSNick Piggin 
9861da177e4SLinus Torvalds 	/* try_to_wake_up() stats */
987480b9434SKen Chen 	unsigned int ttwu_wake_remote;
988480b9434SKen Chen 	unsigned int ttwu_move_affine;
989480b9434SKen Chen 	unsigned int ttwu_move_balance;
9901da177e4SLinus Torvalds #endif
991a5d8c348SIngo Molnar #ifdef CONFIG_SCHED_DEBUG
992a5d8c348SIngo Molnar 	char *name;
993a5d8c348SIngo Molnar #endif
994dce840a0SPeter Zijlstra 	union {
995dce840a0SPeter Zijlstra 		void *private;		/* used during construction */
996dce840a0SPeter Zijlstra 		struct rcu_head rcu;	/* used during destruction */
997dce840a0SPeter Zijlstra 	};
9986c99e9adSRusty Russell 
999669c55e9SPeter Zijlstra 	unsigned int span_weight;
10004200efd9SIngo Molnar 	/*
10014200efd9SIngo Molnar 	 * Span of all CPUs in this domain.
10024200efd9SIngo Molnar 	 *
10034200efd9SIngo Molnar 	 * NOTE: this field is variable length. (Allocated dynamically
10044200efd9SIngo Molnar 	 * by attaching extra space to the end of the structure,
10054200efd9SIngo Molnar 	 * depending on how many CPUs the kernel has booted up with)
10064200efd9SIngo Molnar 	 */
10074200efd9SIngo Molnar 	unsigned long span[0];
10081da177e4SLinus Torvalds };
10091da177e4SLinus Torvalds 
1010758b2cdcSRusty Russell static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
1011758b2cdcSRusty Russell {
10126c99e9adSRusty Russell 	return to_cpumask(sd->span);
1013758b2cdcSRusty Russell }
1014758b2cdcSRusty Russell 
1015acc3f5d7SRusty Russell extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
10161d3504fcSHidetoshi Seto 				    struct sched_domain_attr *dattr_new);
1017029190c5SPaul Jackson 
1018acc3f5d7SRusty Russell /* Allocate an array of sched domains, for partition_sched_domains(). */
1019acc3f5d7SRusty Russell cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1020acc3f5d7SRusty Russell void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1021acc3f5d7SRusty Russell 
102206aaf76aSIngo Molnar /* Test a flag in parent sched domain */
102306aaf76aSIngo Molnar static inline int test_sd_parent(struct sched_domain *sd, int flag)
102406aaf76aSIngo Molnar {
102506aaf76aSIngo Molnar 	if (sd->parent && (sd->parent->flags & flag))
102606aaf76aSIngo Molnar 		return 1;
102706aaf76aSIngo Molnar 
102806aaf76aSIngo Molnar 	return 0;
102906aaf76aSIngo Molnar }
10301da177e4SLinus Torvalds 
103147fe38fcSPeter Zijlstra unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
103247fe38fcSPeter Zijlstra unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
103347fe38fcSPeter Zijlstra 
103439be3501SPeter Zijlstra bool cpus_share_cache(int this_cpu, int that_cpu);
103539be3501SPeter Zijlstra 
10361b427c15SIngo Molnar #else /* CONFIG_SMP */
10371da177e4SLinus Torvalds 
10381b427c15SIngo Molnar struct sched_domain_attr;
10391b427c15SIngo Molnar 
10401b427c15SIngo Molnar static inline void
1041acc3f5d7SRusty Russell partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
10421b427c15SIngo Molnar 			struct sched_domain_attr *dattr_new)
1043d02c7a8cSCon Kolivas {
1044d02c7a8cSCon Kolivas }
104539be3501SPeter Zijlstra 
104639be3501SPeter Zijlstra static inline bool cpus_share_cache(int this_cpu, int that_cpu)
104739be3501SPeter Zijlstra {
104839be3501SPeter Zijlstra 	return true;
104939be3501SPeter Zijlstra }
105039be3501SPeter Zijlstra 
10511b427c15SIngo Molnar #endif	/* !CONFIG_SMP */
10521da177e4SLinus Torvalds 
105347fe38fcSPeter Zijlstra 
10541da177e4SLinus Torvalds struct io_context;			/* See blkdev.h */
10551da177e4SLinus Torvalds 
10561da177e4SLinus Torvalds 
1057383f2835SChen, Kenneth W #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
105836c8b586SIngo Molnar extern void prefetch_stack(struct task_struct *t);
1059383f2835SChen, Kenneth W #else
1060383f2835SChen, Kenneth W static inline void prefetch_stack(struct task_struct *t) { }
1061383f2835SChen, Kenneth W #endif
10621da177e4SLinus Torvalds 
10631da177e4SLinus Torvalds struct audit_context;		/* See audit.c */
10641da177e4SLinus Torvalds struct mempolicy;
1065b92ce558SJens Axboe struct pipe_inode_info;
10664865ecf1SSerge E. Hallyn struct uts_namespace;
10671da177e4SLinus Torvalds 
106820b8a59fSIngo Molnar struct rq;
106920b8a59fSIngo Molnar struct sched_domain;
107020b8a59fSIngo Molnar 
10717d478721SPeter Zijlstra /*
10727d478721SPeter Zijlstra  * wake flags
10737d478721SPeter Zijlstra  */
10747d478721SPeter Zijlstra #define WF_SYNC		0x01		/* waker goes to sleep after wakup */
1075a7558e01SPeter Zijlstra #define WF_FORK		0x02		/* child wakeup after fork */
1076f339b9dcSPeter Zijlstra #define WF_MIGRATED	0x04		/* internal use, task got migrated */
10777d478721SPeter Zijlstra 
1078371fd7e7SPeter Zijlstra #define ENQUEUE_WAKEUP		1
107974f8e4b2SPeter Zijlstra #define ENQUEUE_HEAD		2
108074f8e4b2SPeter Zijlstra #ifdef CONFIG_SMP
108174f8e4b2SPeter Zijlstra #define ENQUEUE_WAKING		4	/* sched_class::task_waking was called */
108274f8e4b2SPeter Zijlstra #else
108374f8e4b2SPeter Zijlstra #define ENQUEUE_WAKING		0
108474f8e4b2SPeter Zijlstra #endif
1085371fd7e7SPeter Zijlstra 
1086371fd7e7SPeter Zijlstra #define DEQUEUE_SLEEP		1
1087371fd7e7SPeter Zijlstra 
108820b8a59fSIngo Molnar struct sched_class {
10895522d5d5SIngo Molnar 	const struct sched_class *next;
109020b8a59fSIngo Molnar 
1091371fd7e7SPeter Zijlstra 	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1092371fd7e7SPeter Zijlstra 	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
10934530d7abSDmitry Adamushko 	void (*yield_task) (struct rq *rq);
1094d95f4122SMike Galbraith 	bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);
109520b8a59fSIngo Molnar 
10967d478721SPeter Zijlstra 	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
109720b8a59fSIngo Molnar 
1098fb8d4724SIngo Molnar 	struct task_struct * (*pick_next_task) (struct rq *rq);
109931ee529cSIngo Molnar 	void (*put_prev_task) (struct rq *rq, struct task_struct *p);
110020b8a59fSIngo Molnar 
1101681f3e68SPeter Williams #ifdef CONFIG_SMP
11027608dec2SPeter Zijlstra 	int  (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);
11034ce72a2cSLi Zefan 
11049a897c5aSSteven Rostedt 	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
11059a897c5aSSteven Rostedt 	void (*post_schedule) (struct rq *this_rq);
110674f8e4b2SPeter Zijlstra 	void (*task_waking) (struct task_struct *task);
1107efbbd05aSPeter Zijlstra 	void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1108e1d1484fSPeter Williams 
1109cd8ba7cdSMike Travis 	void (*set_cpus_allowed)(struct task_struct *p,
111096f874e2SRusty Russell 				 const struct cpumask *newmask);
111157d885feSGregory Haskins 
11121f11eb6aSGregory Haskins 	void (*rq_online)(struct rq *rq);
11131f11eb6aSGregory Haskins 	void (*rq_offline)(struct rq *rq);
11144ce72a2cSLi Zefan #endif
11154ce72a2cSLi Zefan 
11164ce72a2cSLi Zefan 	void (*set_curr_task) (struct rq *rq);
11174ce72a2cSLi Zefan 	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1118cd29fe6fSPeter Zijlstra 	void (*task_fork) (struct task_struct *p);
1119cb469845SSteven Rostedt 
1120da7a735eSPeter Zijlstra 	void (*switched_from) (struct rq *this_rq, struct task_struct *task);
1121da7a735eSPeter Zijlstra 	void (*switched_to) (struct rq *this_rq, struct task_struct *task);
1122cb469845SSteven Rostedt 	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1123da7a735eSPeter Zijlstra 			     int oldprio);
1124810b3817SPeter Zijlstra 
1125dba091b9SThomas Gleixner 	unsigned int (*get_rr_interval) (struct rq *rq,
1126dba091b9SThomas Gleixner 					 struct task_struct *task);
11270d721ceaSPeter Williams 
1128810b3817SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED
1129b2b5ce02SPeter Zijlstra 	void (*task_move_group) (struct task_struct *p, int on_rq);
1130810b3817SPeter Zijlstra #endif
113120b8a59fSIngo Molnar };
113220b8a59fSIngo Molnar 
113320b8a59fSIngo Molnar struct load_weight {
113420b8a59fSIngo Molnar 	unsigned long weight, inv_weight;
113520b8a59fSIngo Molnar };
113620b8a59fSIngo Molnar 
113794c18227SIngo Molnar #ifdef CONFIG_SCHEDSTATS
113841acab88SLucas De Marchi struct sched_statistics {
113994c18227SIngo Molnar 	u64			wait_start;
114094c18227SIngo Molnar 	u64			wait_max;
11416d082592SArjan van de Ven 	u64			wait_count;
11426d082592SArjan van de Ven 	u64			wait_sum;
11438f0dfc34SArjan van de Ven 	u64			iowait_count;
11448f0dfc34SArjan van de Ven 	u64			iowait_sum;
114594c18227SIngo Molnar 
114694c18227SIngo Molnar 	u64			sleep_start;
114720b8a59fSIngo Molnar 	u64			sleep_max;
114894c18227SIngo Molnar 	s64			sum_sleep_runtime;
114994c18227SIngo Molnar 
115094c18227SIngo Molnar 	u64			block_start;
115120b8a59fSIngo Molnar 	u64			block_max;
115220b8a59fSIngo Molnar 	u64			exec_max;
1153eba1ed4bSIngo Molnar 	u64			slice_max;
1154cc367732SIngo Molnar 
1155cc367732SIngo Molnar 	u64			nr_migrations_cold;
1156cc367732SIngo Molnar 	u64			nr_failed_migrations_affine;
1157cc367732SIngo Molnar 	u64			nr_failed_migrations_running;
1158cc367732SIngo Molnar 	u64			nr_failed_migrations_hot;
1159cc367732SIngo Molnar 	u64			nr_forced_migrations;
1160cc367732SIngo Molnar 
1161cc367732SIngo Molnar 	u64			nr_wakeups;
1162cc367732SIngo Molnar 	u64			nr_wakeups_sync;
1163cc367732SIngo Molnar 	u64			nr_wakeups_migrate;
1164cc367732SIngo Molnar 	u64			nr_wakeups_local;
1165cc367732SIngo Molnar 	u64			nr_wakeups_remote;
1166cc367732SIngo Molnar 	u64			nr_wakeups_affine;
1167cc367732SIngo Molnar 	u64			nr_wakeups_affine_attempts;
1168cc367732SIngo Molnar 	u64			nr_wakeups_passive;
1169cc367732SIngo Molnar 	u64			nr_wakeups_idle;
117041acab88SLucas De Marchi };
117141acab88SLucas De Marchi #endif
117241acab88SLucas De Marchi 
117341acab88SLucas De Marchi struct sched_entity {
117441acab88SLucas De Marchi 	struct load_weight	load;		/* for load-balancing */
117541acab88SLucas De Marchi 	struct rb_node		run_node;
117641acab88SLucas De Marchi 	struct list_head	group_node;
117741acab88SLucas De Marchi 	unsigned int		on_rq;
117841acab88SLucas De Marchi 
117941acab88SLucas De Marchi 	u64			exec_start;
118041acab88SLucas De Marchi 	u64			sum_exec_runtime;
118141acab88SLucas De Marchi 	u64			vruntime;
118241acab88SLucas De Marchi 	u64			prev_sum_exec_runtime;
118341acab88SLucas De Marchi 
118441acab88SLucas De Marchi 	u64			nr_migrations;
118541acab88SLucas De Marchi 
118641acab88SLucas De Marchi #ifdef CONFIG_SCHEDSTATS
118741acab88SLucas De Marchi 	struct sched_statistics statistics;
118894c18227SIngo Molnar #endif
118994c18227SIngo Molnar 
119020b8a59fSIngo Molnar #ifdef CONFIG_FAIR_GROUP_SCHED
119120b8a59fSIngo Molnar 	struct sched_entity	*parent;
119220b8a59fSIngo Molnar 	/* rq on which this entity is (to be) queued: */
119320b8a59fSIngo Molnar 	struct cfs_rq		*cfs_rq;
119420b8a59fSIngo Molnar 	/* rq "owned" by this entity/group: */
119520b8a59fSIngo Molnar 	struct cfs_rq		*my_q;
119620b8a59fSIngo Molnar #endif
119720b8a59fSIngo Molnar };
119870b97a7fSIngo Molnar 
1199fa717060SPeter Zijlstra struct sched_rt_entity {
1200fa717060SPeter Zijlstra 	struct list_head run_list;
120178f2c7dbSPeter Zijlstra 	unsigned long timeout;
1202bee367edSRichard Kennedy 	unsigned int time_slice;
12036f505b16SPeter Zijlstra 
120458d6c2d7SPeter Zijlstra 	struct sched_rt_entity *back;
1205052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED
12066f505b16SPeter Zijlstra 	struct sched_rt_entity	*parent;
12076f505b16SPeter Zijlstra 	/* rq on which this entity is (to be) queued: */
12086f505b16SPeter Zijlstra 	struct rt_rq		*rt_rq;
12096f505b16SPeter Zijlstra 	/* rq "owned" by this entity/group: */
12106f505b16SPeter Zijlstra 	struct rt_rq		*my_q;
12116f505b16SPeter Zijlstra #endif
1212fa717060SPeter Zijlstra };
1213fa717060SPeter Zijlstra 
1214de5bdff7SHiroshi Shimamoto /*
1215de5bdff7SHiroshi Shimamoto  * default timeslice is 100 msecs (used only for SCHED_RR tasks).
1216de5bdff7SHiroshi Shimamoto  * Timeslices get refilled after they expire.
1217de5bdff7SHiroshi Shimamoto  */
1218de5bdff7SHiroshi Shimamoto #define RR_TIMESLICE		(100 * HZ / 1000)
1219de5bdff7SHiroshi Shimamoto 
122086848966SPaul E. McKenney struct rcu_node;
122186848966SPaul E. McKenney 
12228dc85d54SPeter Zijlstra enum perf_event_task_context {
12238dc85d54SPeter Zijlstra 	perf_invalid_context = -1,
12248dc85d54SPeter Zijlstra 	perf_hw_context = 0,
122589a1e187SPeter Zijlstra 	perf_sw_context,
12268dc85d54SPeter Zijlstra 	perf_nr_task_contexts,
12278dc85d54SPeter Zijlstra };
12288dc85d54SPeter Zijlstra 
12291da177e4SLinus Torvalds struct task_struct {
12301da177e4SLinus Torvalds 	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
1231f7e4217bSRoman Zippel 	void *stack;
12321da177e4SLinus Torvalds 	atomic_t usage;
123397dc32cdSWilliam Cohen 	unsigned int flags;	/* per process flags, defined below */
123497dc32cdSWilliam Cohen 	unsigned int ptrace;
12351da177e4SLinus Torvalds 
12362dd73a4fSPeter Williams #ifdef CONFIG_SMP
1237fa14ff4aSPeter Zijlstra 	struct llist_node wake_entry;
12383ca7a440SPeter Zijlstra 	int on_cpu;
12394866cde0SNick Piggin #endif
1240fd2f4419SPeter Zijlstra 	int on_rq;
124150e645a8SIngo Molnar 
1242b29739f9SIngo Molnar 	int prio, static_prio, normal_prio;
1243c7aceabaSRichard Kennedy 	unsigned int rt_priority;
12445522d5d5SIngo Molnar 	const struct sched_class *sched_class;
124520b8a59fSIngo Molnar 	struct sched_entity se;
1246fa717060SPeter Zijlstra 	struct sched_rt_entity rt;
12471da177e4SLinus Torvalds 
1248e107be36SAvi Kivity #ifdef CONFIG_PREEMPT_NOTIFIERS
1249e107be36SAvi Kivity 	/* list of struct preempt_notifier: */
1250e107be36SAvi Kivity 	struct hlist_head preempt_notifiers;
1251e107be36SAvi Kivity #endif
1252e107be36SAvi Kivity 
125318796aa0SAlexey Dobriyan 	/*
125418796aa0SAlexey Dobriyan 	 * fpu_counter contains the number of consecutive context switches
125518796aa0SAlexey Dobriyan 	 * that the FPU is used. If this is over a threshold, the lazy fpu
125618796aa0SAlexey Dobriyan 	 * saving becomes unlazy to save the trap. This is an unsigned char
125718796aa0SAlexey Dobriyan 	 * so that after 256 times the counter wraps and the behavior turns
125818796aa0SAlexey Dobriyan 	 * lazy again; this to deal with bursty apps that only use FPU for
125918796aa0SAlexey Dobriyan 	 * a short time
126018796aa0SAlexey Dobriyan 	 */
126118796aa0SAlexey Dobriyan 	unsigned char fpu_counter;
12626c5c9341SAlexey Dobriyan #ifdef CONFIG_BLK_DEV_IO_TRACE
12632056a782SJens Axboe 	unsigned int btrace_seq;
12646c5c9341SAlexey Dobriyan #endif
12651da177e4SLinus Torvalds 
126697dc32cdSWilliam Cohen 	unsigned int policy;
126729baa747SPeter Zijlstra 	int nr_cpus_allowed;
12681da177e4SLinus Torvalds 	cpumask_t cpus_allowed;
12691da177e4SLinus Torvalds 
1270a57eb940SPaul E. McKenney #ifdef CONFIG_PREEMPT_RCU
1271e260be67SPaul E. McKenney 	int rcu_read_lock_nesting;
1272f41d911fSPaul E. McKenney 	char rcu_read_unlock_special;
1273f41d911fSPaul E. McKenney 	struct list_head rcu_node_entry;
1274a57eb940SPaul E. McKenney #endif /* #ifdef CONFIG_PREEMPT_RCU */
1275a57eb940SPaul E. McKenney #ifdef CONFIG_TREE_PREEMPT_RCU
1276a57eb940SPaul E. McKenney 	struct rcu_node *rcu_blocked_node;
1277f41d911fSPaul E. McKenney #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
127824278d14SPaul E. McKenney #ifdef CONFIG_RCU_BOOST
127924278d14SPaul E. McKenney 	struct rt_mutex *rcu_boost_mutex;
128024278d14SPaul E. McKenney #endif /* #ifdef CONFIG_RCU_BOOST */
1281e260be67SPaul E. McKenney 
128252f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
12831da177e4SLinus Torvalds 	struct sched_info sched_info;
12841da177e4SLinus Torvalds #endif
12851da177e4SLinus Torvalds 
12861da177e4SLinus Torvalds 	struct list_head tasks;
1287806c09a7SDario Faggioli #ifdef CONFIG_SMP
1288917b627dSGregory Haskins 	struct plist_node pushable_tasks;
1289806c09a7SDario Faggioli #endif
12901da177e4SLinus Torvalds 
12911da177e4SLinus Torvalds 	struct mm_struct *mm, *active_mm;
12924471a675SJiri Kosina #ifdef CONFIG_COMPAT_BRK
12934471a675SJiri Kosina 	unsigned brk_randomized:1;
12944471a675SJiri Kosina #endif
129534e55232SKAMEZAWA Hiroyuki #if defined(SPLIT_RSS_COUNTING)
129634e55232SKAMEZAWA Hiroyuki 	struct task_rss_stat	rss_stat;
129734e55232SKAMEZAWA Hiroyuki #endif
12981da177e4SLinus Torvalds /* task state */
129997dc32cdSWilliam Cohen 	int exit_state;
13001da177e4SLinus Torvalds 	int exit_code, exit_signal;
13011da177e4SLinus Torvalds 	int pdeath_signal;  /*  The signal sent when the parent dies  */
1302a8f072c1STejun Heo 	unsigned int jobctl;	/* JOBCTL_*, siglock protected */
13031da177e4SLinus Torvalds 	/* ??? */
130497dc32cdSWilliam Cohen 	unsigned int personality;
13051da177e4SLinus Torvalds 	unsigned did_exec:1;
1306f9ce1f1cSKentaro Takeda 	unsigned in_execve:1;	/* Tell the LSMs that the process is doing an
1307f9ce1f1cSKentaro Takeda 				 * execve */
13088f0dfc34SArjan van de Ven 	unsigned in_iowait:1;
13098f0dfc34SArjan van de Ven 
1310259e5e6cSAndy Lutomirski 	/* task may not gain privileges */
1311259e5e6cSAndy Lutomirski 	unsigned no_new_privs:1;
1312ca94c442SLennart Poettering 
1313ca94c442SLennart Poettering 	/* Revert to default priority/policy when forking */
1314ca94c442SLennart Poettering 	unsigned sched_reset_on_fork:1;
1315a8e4f2eaSPeter Zijlstra 	unsigned sched_contributes_to_load:1;
1316ca94c442SLennart Poettering 
13171da177e4SLinus Torvalds 	pid_t pid;
13181da177e4SLinus Torvalds 	pid_t tgid;
13190a425405SArjan van de Ven 
13201314562aSHiroshi Shimamoto #ifdef CONFIG_CC_STACKPROTECTOR
13210a425405SArjan van de Ven 	/* Canary value for the -fstack-protector gcc feature */
13220a425405SArjan van de Ven 	unsigned long stack_canary;
13231314562aSHiroshi Shimamoto #endif
13241da177e4SLinus Torvalds 	/*
13251da177e4SLinus Torvalds 	 * pointers to (original) parent process, youngest child, younger sibling,
13261da177e4SLinus Torvalds 	 * older sibling, respectively.  (p->father can be replaced with
1327f470021aSRoland McGrath 	 * p->real_parent->pid)
13281da177e4SLinus Torvalds 	 */
1329abd63bc3SKees Cook 	struct task_struct __rcu *real_parent; /* real parent process */
1330abd63bc3SKees Cook 	struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
13311da177e4SLinus Torvalds 	/*
1332f470021aSRoland McGrath 	 * children/sibling forms the list of my natural children
13331da177e4SLinus Torvalds 	 */
13341da177e4SLinus Torvalds 	struct list_head children;	/* list of my children */
13351da177e4SLinus Torvalds 	struct list_head sibling;	/* linkage in my parent's children list */
13361da177e4SLinus Torvalds 	struct task_struct *group_leader;	/* threadgroup leader */
13371da177e4SLinus Torvalds 
1338f470021aSRoland McGrath 	/*
1339f470021aSRoland McGrath 	 * ptraced is the list of tasks this task is using ptrace on.
1340f470021aSRoland McGrath 	 * This includes both natural children and PTRACE_ATTACH targets.
1341f470021aSRoland McGrath 	 * p->ptrace_entry is p's link on the p->parent->ptraced list.
1342f470021aSRoland McGrath 	 */
1343f470021aSRoland McGrath 	struct list_head ptraced;
1344f470021aSRoland McGrath 	struct list_head ptrace_entry;
1345f470021aSRoland McGrath 
13461da177e4SLinus Torvalds 	/* PID/PID hash table linkage. */
134792476d7fSEric W. Biederman 	struct pid_link pids[PIDTYPE_MAX];
134847e65328SOleg Nesterov 	struct list_head thread_group;
13491da177e4SLinus Torvalds 
13501da177e4SLinus Torvalds 	struct completion *vfork_done;		/* for vfork() */
13511da177e4SLinus Torvalds 	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
13521da177e4SLinus Torvalds 	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */
13531da177e4SLinus Torvalds 
1354c66f08beSMichael Neuling 	cputime_t utime, stime, utimescaled, stimescaled;
13559ac52315SLaurent Vivier 	cputime_t gtime;
1356d99ca3b9SHidetoshi Seto #ifndef CONFIG_VIRT_CPU_ACCOUNTING
13579301899bSBalbir Singh 	cputime_t prev_utime, prev_stime;
1358d99ca3b9SHidetoshi Seto #endif
13591da177e4SLinus Torvalds 	unsigned long nvcsw, nivcsw; /* context switch counts */
1360924b42d5STomas Janousek 	struct timespec start_time; 		/* monotonic time */
1361924b42d5STomas Janousek 	struct timespec real_start_time;	/* boot based time */
13621da177e4SLinus Torvalds /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
13631da177e4SLinus Torvalds 	unsigned long min_flt, maj_flt;
13641da177e4SLinus Torvalds 
1365f06febc9SFrank Mayhar 	struct task_cputime cputime_expires;
13661da177e4SLinus Torvalds 	struct list_head cpu_timers[3];
13671da177e4SLinus Torvalds 
13681da177e4SLinus Torvalds /* process credentials */
13691b0ba1c9SArnd Bergmann 	const struct cred __rcu *real_cred; /* objective and real subjective task
13703b11a1deSDavid Howells 					 * credentials (COW) */
13711b0ba1c9SArnd Bergmann 	const struct cred __rcu *cred;	/* effective (overridable) subjective task
13723b11a1deSDavid Howells 					 * credentials (COW) */
137336772092SPaolo 'Blaisorblade' Giarrusso 	char comm[TASK_COMM_LEN]; /* executable name excluding path
137436772092SPaolo 'Blaisorblade' Giarrusso 				     - access with [gs]et_task_comm (which lock
137536772092SPaolo 'Blaisorblade' Giarrusso 				       it with task_lock())
1376221af7f8SLinus Torvalds 				     - initialized normally by setup_new_exec */
13771da177e4SLinus Torvalds /* file system info */
13781da177e4SLinus Torvalds 	int link_count, total_link_count;
13793d5b6fccSAlexey Dobriyan #ifdef CONFIG_SYSVIPC
13801da177e4SLinus Torvalds /* ipc stuff */
13811da177e4SLinus Torvalds 	struct sysv_sem sysvsem;
13823d5b6fccSAlexey Dobriyan #endif
1383e162b39aSMandeep Singh Baines #ifdef CONFIG_DETECT_HUNG_TASK
138482a1fcb9SIngo Molnar /* hung task detection */
138582a1fcb9SIngo Molnar 	unsigned long last_switch_count;
138682a1fcb9SIngo Molnar #endif
13871da177e4SLinus Torvalds /* CPU-specific state of this task */
13881da177e4SLinus Torvalds 	struct thread_struct thread;
13891da177e4SLinus Torvalds /* filesystem information */
13901da177e4SLinus Torvalds 	struct fs_struct *fs;
13911da177e4SLinus Torvalds /* open file information */
13921da177e4SLinus Torvalds 	struct files_struct *files;
13931651e14eSSerge E. Hallyn /* namespaces */
1394ab516013SSerge E. Hallyn 	struct nsproxy *nsproxy;
13951da177e4SLinus Torvalds /* signal handlers */
13961da177e4SLinus Torvalds 	struct signal_struct *signal;
13971da177e4SLinus Torvalds 	struct sighand_struct *sighand;
13981da177e4SLinus Torvalds 
13991da177e4SLinus Torvalds 	sigset_t blocked, real_blocked;
1400f3de272bSRoland McGrath 	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
14011da177e4SLinus Torvalds 	struct sigpending pending;
14021da177e4SLinus Torvalds 
14031da177e4SLinus Torvalds 	unsigned long sas_ss_sp;
14041da177e4SLinus Torvalds 	size_t sas_ss_size;
14051da177e4SLinus Torvalds 	int (*notifier)(void *priv);
14061da177e4SLinus Torvalds 	void *notifier_data;
14071da177e4SLinus Torvalds 	sigset_t *notifier_mask;
1408*67d12145SAl Viro 	struct callback_head *task_works;
1409e73f8959SOleg Nesterov 
14101da177e4SLinus Torvalds 	struct audit_context *audit_context;
1411bfef93a5SAl Viro #ifdef CONFIG_AUDITSYSCALL
1412bfef93a5SAl Viro 	uid_t loginuid;
14134746ec5bSEric Paris 	unsigned int sessionid;
1414bfef93a5SAl Viro #endif
1415932ecebbSWill Drewry 	struct seccomp seccomp;
14161da177e4SLinus Torvalds 
14171da177e4SLinus Torvalds /* Thread group tracking */
14181da177e4SLinus Torvalds    	u32 parent_exec_id;
14191da177e4SLinus Torvalds    	u32 self_exec_id;
142058568d2aSMiao Xie /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
142158568d2aSMiao Xie  * mempolicy */
14221da177e4SLinus Torvalds 	spinlock_t alloc_lock;
14231da177e4SLinus Torvalds 
1424b29739f9SIngo Molnar 	/* Protection of the PI data structures: */
14251d615482SThomas Gleixner 	raw_spinlock_t pi_lock;
1426b29739f9SIngo Molnar 
142723f78d4aSIngo Molnar #ifdef CONFIG_RT_MUTEXES
142823f78d4aSIngo Molnar 	/* PI waiters blocked on a rt_mutex held by this task */
142923f78d4aSIngo Molnar 	struct plist_head pi_waiters;
143023f78d4aSIngo Molnar 	/* Deadlock detection and priority inheritance handling */
143123f78d4aSIngo Molnar 	struct rt_mutex_waiter *pi_blocked_on;
143223f78d4aSIngo Molnar #endif
143323f78d4aSIngo Molnar 
1434408894eeSIngo Molnar #ifdef CONFIG_DEBUG_MUTEXES
1435408894eeSIngo Molnar 	/* mutex deadlock detection */
1436408894eeSIngo Molnar 	struct mutex_waiter *blocked_on;
1437408894eeSIngo Molnar #endif
1438de30a2b3SIngo Molnar #ifdef CONFIG_TRACE_IRQFLAGS
1439de30a2b3SIngo Molnar 	unsigned int irq_events;
1440de30a2b3SIngo Molnar 	unsigned long hardirq_enable_ip;
1441de30a2b3SIngo Molnar 	unsigned long hardirq_disable_ip;
1442fa1452e8SHiroshi Shimamoto 	unsigned int hardirq_enable_event;
1443de30a2b3SIngo Molnar 	unsigned int hardirq_disable_event;
1444fa1452e8SHiroshi Shimamoto 	int hardirqs_enabled;
1445de30a2b3SIngo Molnar 	int hardirq_context;
1446fa1452e8SHiroshi Shimamoto 	unsigned long softirq_disable_ip;
1447fa1452e8SHiroshi Shimamoto 	unsigned long softirq_enable_ip;
1448fa1452e8SHiroshi Shimamoto 	unsigned int softirq_disable_event;
1449fa1452e8SHiroshi Shimamoto 	unsigned int softirq_enable_event;
1450fa1452e8SHiroshi Shimamoto 	int softirqs_enabled;
1451de30a2b3SIngo Molnar 	int softirq_context;
1452de30a2b3SIngo Molnar #endif
1453fbb9ce95SIngo Molnar #ifdef CONFIG_LOCKDEP
1454bdb9441eSPeter Zijlstra # define MAX_LOCK_DEPTH 48UL
1455fbb9ce95SIngo Molnar 	u64 curr_chain_key;
1456fbb9ce95SIngo Molnar 	int lockdep_depth;
1457fbb9ce95SIngo Molnar 	unsigned int lockdep_recursion;
1458c7aceabaSRichard Kennedy 	struct held_lock held_locks[MAX_LOCK_DEPTH];
1459cf40bd16SNick Piggin 	gfp_t lockdep_reclaim_gfp;
1460fbb9ce95SIngo Molnar #endif
1461408894eeSIngo Molnar 
14621da177e4SLinus Torvalds /* journalling filesystem info */
14631da177e4SLinus Torvalds 	void *journal_info;
14641da177e4SLinus Torvalds 
1465d89d8796SNeil Brown /* stacked block device info */
1466bddd87c7SAkinobu Mita 	struct bio_list *bio_list;
1467d89d8796SNeil Brown 
146873c10101SJens Axboe #ifdef CONFIG_BLOCK
146973c10101SJens Axboe /* stack plugging */
147073c10101SJens Axboe 	struct blk_plug *plug;
147173c10101SJens Axboe #endif
147273c10101SJens Axboe 
14731da177e4SLinus Torvalds /* VM state */
14741da177e4SLinus Torvalds 	struct reclaim_state *reclaim_state;
14751da177e4SLinus Torvalds 
14761da177e4SLinus Torvalds 	struct backing_dev_info *backing_dev_info;
14771da177e4SLinus Torvalds 
14781da177e4SLinus Torvalds 	struct io_context *io_context;
14791da177e4SLinus Torvalds 
14801da177e4SLinus Torvalds 	unsigned long ptrace_message;
14811da177e4SLinus Torvalds 	siginfo_t *last_siginfo; /* For ptrace use.  */
14827c3ab738SAndrew Morton 	struct task_io_accounting ioac;
14838f0ab514SJay Lan #if defined(CONFIG_TASK_XACCT)
14841da177e4SLinus Torvalds 	u64 acct_rss_mem1;	/* accumulated rss usage */
14851da177e4SLinus Torvalds 	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
148649b5cf34SJonathan Lim 	cputime_t acct_timexpd;	/* stime + utime since last update */
14871da177e4SLinus Torvalds #endif
14881da177e4SLinus Torvalds #ifdef CONFIG_CPUSETS
148958568d2aSMiao Xie 	nodemask_t mems_allowed;	/* Protected by alloc_lock */
1490cc9a6c87SMel Gorman 	seqcount_t mems_allowed_seq;	/* Seqence no to catch updates */
1491825a46afSPaul Jackson 	int cpuset_mem_spread_rotor;
14926adef3ebSJack Steiner 	int cpuset_slab_spread_rotor;
14931da177e4SLinus Torvalds #endif
1494ddbcc7e8SPaul Menage #ifdef CONFIG_CGROUPS
1495817929ecSPaul Menage 	/* Control Group info protected by css_set_lock */
14962c392b8cSArnd Bergmann 	struct css_set __rcu *cgroups;
1497817929ecSPaul Menage 	/* cg_list protected by css_set_lock and tsk->alloc_lock */
1498817929ecSPaul Menage 	struct list_head cg_list;
1499ddbcc7e8SPaul Menage #endif
150042b2dd0aSAlexey Dobriyan #ifdef CONFIG_FUTEX
15010771dfefSIngo Molnar 	struct robust_list_head __user *robust_list;
150234f192c6SIngo Molnar #ifdef CONFIG_COMPAT
150334f192c6SIngo Molnar 	struct compat_robust_list_head __user *compat_robust_list;
150434f192c6SIngo Molnar #endif
1505c87e2837SIngo Molnar 	struct list_head pi_state_list;
1506c87e2837SIngo Molnar 	struct futex_pi_state *pi_state_cache;
150742b2dd0aSAlexey Dobriyan #endif
1508cdd6c482SIngo Molnar #ifdef CONFIG_PERF_EVENTS
15098dc85d54SPeter Zijlstra 	struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1510cdd6c482SIngo Molnar 	struct mutex perf_event_mutex;
1511cdd6c482SIngo Molnar 	struct list_head perf_event_list;
1512a63eaf34SPaul Mackerras #endif
1513c7aceabaSRichard Kennedy #ifdef CONFIG_NUMA
151458568d2aSMiao Xie 	struct mempolicy *mempolicy;	/* Protected by alloc_lock */
1515c7aceabaSRichard Kennedy 	short il_next;
1516207205a2SEric Dumazet 	short pref_node_fork;
1517c7aceabaSRichard Kennedy #endif
1518e56d0903SIngo Molnar 	struct rcu_head rcu;
1519b92ce558SJens Axboe 
1520b92ce558SJens Axboe 	/*
1521b92ce558SJens Axboe 	 * cache last used pipe for splice
1522b92ce558SJens Axboe 	 */
1523b92ce558SJens Axboe 	struct pipe_inode_info *splice_pipe;
1524ca74e92bSShailabh Nagar #ifdef	CONFIG_TASK_DELAY_ACCT
1525ca74e92bSShailabh Nagar 	struct task_delay_info *delays;
1526ca74e92bSShailabh Nagar #endif
1527f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION
1528f4f154fdSAkinobu Mita 	int make_it_fail;
1529f4f154fdSAkinobu Mita #endif
15309d823e8fSWu Fengguang 	/*
15319d823e8fSWu Fengguang 	 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
15329d823e8fSWu Fengguang 	 * balance_dirty_pages() for some dirty throttling pause
15339d823e8fSWu Fengguang 	 */
15349d823e8fSWu Fengguang 	int nr_dirtied;
15359d823e8fSWu Fengguang 	int nr_dirtied_pause;
153683712358SWu Fengguang 	unsigned long dirty_paused_when; /* start of a write-and-pause period */
15379d823e8fSWu Fengguang 
15389745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP
15399745512cSArjan van de Ven 	int latency_record_count;
15409745512cSArjan van de Ven 	struct latency_record latency_record[LT_SAVECOUNT];
15419745512cSArjan van de Ven #endif
15426976675dSArjan van de Ven 	/*
15436976675dSArjan van de Ven 	 * time slack values; these are used to round up poll() and
15446976675dSArjan van de Ven 	 * select() etc timeout values. These are in nanoseconds.
15456976675dSArjan van de Ven 	 */
15466976675dSArjan van de Ven 	unsigned long timer_slack_ns;
15476976675dSArjan van de Ven 	unsigned long default_timer_slack_ns;
1548f8d570a4SDavid Miller 
1549f8d570a4SDavid Miller 	struct list_head	*scm_work_list;
1550fb52607aSFrederic Weisbecker #ifdef CONFIG_FUNCTION_GRAPH_TRACER
15513ad2f3fbSDaniel Mack 	/* Index of current stored address in ret_stack */
1552f201ae23SFrederic Weisbecker 	int curr_ret_stack;
1553f201ae23SFrederic Weisbecker 	/* Stack of return addresses for return function tracing */
1554f201ae23SFrederic Weisbecker 	struct ftrace_ret_stack	*ret_stack;
15558aef2d28SSteven Rostedt 	/* time stamp for last schedule */
15568aef2d28SSteven Rostedt 	unsigned long long ftrace_timestamp;
1557f201ae23SFrederic Weisbecker 	/*
1558f201ae23SFrederic Weisbecker 	 * Number of functions that haven't been traced
1559f201ae23SFrederic Weisbecker 	 * because of depth overrun.
1560f201ae23SFrederic Weisbecker 	 */
1561f201ae23SFrederic Weisbecker 	atomic_t trace_overrun;
1562380c4b14SFrederic Weisbecker 	/* Pause for the tracing */
1563380c4b14SFrederic Weisbecker 	atomic_t tracing_graph_pause;
1564f201ae23SFrederic Weisbecker #endif
1565ea4e2bc4SSteven Rostedt #ifdef CONFIG_TRACING
1566ea4e2bc4SSteven Rostedt 	/* state flags for use by tracers */
1567ea4e2bc4SSteven Rostedt 	unsigned long trace;
1568b1cff0adSSteven Rostedt 	/* bitmask and counter of trace recursion */
1569261842b7SSteven Rostedt 	unsigned long trace_recursion;
1570261842b7SSteven Rostedt #endif /* CONFIG_TRACING */
1571569b846dSKAMEZAWA Hiroyuki #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1572569b846dSKAMEZAWA Hiroyuki 	struct memcg_batch_info {
1573569b846dSKAMEZAWA Hiroyuki 		int do_batch;	/* incremented when batch uncharge started */
1574569b846dSKAMEZAWA Hiroyuki 		struct mem_cgroup *memcg; /* target memcg of uncharge */
15757ffd4ca7SJohannes Weiner 		unsigned long nr_pages;	/* uncharged usage */
15767ffd4ca7SJohannes Weiner 		unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
1577569b846dSKAMEZAWA Hiroyuki 	} memcg_batch;
1578569b846dSKAMEZAWA Hiroyuki #endif
1579bf26c018SFrederic Weisbecker #ifdef CONFIG_HAVE_HW_BREAKPOINT
1580bf26c018SFrederic Weisbecker 	atomic_t ptrace_bp_refcnt;
1581bf26c018SFrederic Weisbecker #endif
15820326f5a9SSrikar Dronamraju #ifdef CONFIG_UPROBES
15830326f5a9SSrikar Dronamraju 	struct uprobe_task *utask;
15840326f5a9SSrikar Dronamraju 	int uprobe_srcu_id;
15850326f5a9SSrikar Dronamraju #endif
15861da177e4SLinus Torvalds };
15871da177e4SLinus Torvalds 
158876e6eee0SRusty Russell /* Future-safe accessor for struct task_struct's cpus_allowed. */
1589a4636818SRusty Russell #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
159076e6eee0SRusty Russell 
1591e05606d3SIngo Molnar /*
1592e05606d3SIngo Molnar  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1593e05606d3SIngo Molnar  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1594e05606d3SIngo Molnar  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1595e05606d3SIngo Molnar  * values are inverted: lower p->prio value means higher priority.
1596e05606d3SIngo Molnar  *
1597e05606d3SIngo Molnar  * The MAX_USER_RT_PRIO value allows the actual maximum
1598e05606d3SIngo Molnar  * RT priority to be separate from the value exported to
1599e05606d3SIngo Molnar  * user-space.  This allows kernel threads to set their
1600e05606d3SIngo Molnar  * priority to a value higher than any user task. Note:
1601e05606d3SIngo Molnar  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1602e05606d3SIngo Molnar  */
1603e05606d3SIngo Molnar 
1604e05606d3SIngo Molnar #define MAX_USER_RT_PRIO	100
1605e05606d3SIngo Molnar #define MAX_RT_PRIO		MAX_USER_RT_PRIO
1606e05606d3SIngo Molnar 
1607e05606d3SIngo Molnar #define MAX_PRIO		(MAX_RT_PRIO + 40)
1608e05606d3SIngo Molnar #define DEFAULT_PRIO		(MAX_RT_PRIO + 20)
1609e05606d3SIngo Molnar 
1610e05606d3SIngo Molnar static inline int rt_prio(int prio)
1611e05606d3SIngo Molnar {
1612e05606d3SIngo Molnar 	if (unlikely(prio < MAX_RT_PRIO))
1613e05606d3SIngo Molnar 		return 1;
1614e05606d3SIngo Molnar 	return 0;
1615e05606d3SIngo Molnar }
1616e05606d3SIngo Molnar 
1617e868171aSAlexey Dobriyan static inline int rt_task(struct task_struct *p)
1618e05606d3SIngo Molnar {
1619e05606d3SIngo Molnar 	return rt_prio(p->prio);
1620e05606d3SIngo Molnar }
1621e05606d3SIngo Molnar 
1622e868171aSAlexey Dobriyan static inline struct pid *task_pid(struct task_struct *task)
162322c935f4SEric W. Biederman {
162422c935f4SEric W. Biederman 	return task->pids[PIDTYPE_PID].pid;
162522c935f4SEric W. Biederman }
162622c935f4SEric W. Biederman 
1627e868171aSAlexey Dobriyan static inline struct pid *task_tgid(struct task_struct *task)
162822c935f4SEric W. Biederman {
162922c935f4SEric W. Biederman 	return task->group_leader->pids[PIDTYPE_PID].pid;
163022c935f4SEric W. Biederman }
163122c935f4SEric W. Biederman 
16326dda81f4SOleg Nesterov /*
16336dda81f4SOleg Nesterov  * Without tasklist or rcu lock it is not safe to dereference
16346dda81f4SOleg Nesterov  * the result of task_pgrp/task_session even if task == current,
16356dda81f4SOleg Nesterov  * we can race with another thread doing sys_setsid/sys_setpgid.
16366dda81f4SOleg Nesterov  */
1637e868171aSAlexey Dobriyan static inline struct pid *task_pgrp(struct task_struct *task)
163822c935f4SEric W. Biederman {
163922c935f4SEric W. Biederman 	return task->group_leader->pids[PIDTYPE_PGID].pid;
164022c935f4SEric W. Biederman }
164122c935f4SEric W. Biederman 
1642e868171aSAlexey Dobriyan static inline struct pid *task_session(struct task_struct *task)
164322c935f4SEric W. Biederman {
164422c935f4SEric W. Biederman 	return task->group_leader->pids[PIDTYPE_SID].pid;
164522c935f4SEric W. Biederman }
164622c935f4SEric W. Biederman 
16477af57294SPavel Emelyanov struct pid_namespace;
16487af57294SPavel Emelyanov 
16497af57294SPavel Emelyanov /*
16507af57294SPavel Emelyanov  * the helpers to get the task's different pids as they are seen
16517af57294SPavel Emelyanov  * from various namespaces
16527af57294SPavel Emelyanov  *
16537af57294SPavel Emelyanov  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
165444c4e1b2SEric W. Biederman  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
165544c4e1b2SEric W. Biederman  *                     current.
16567af57294SPavel Emelyanov  * task_xid_nr_ns()  : id seen from the ns specified;
16577af57294SPavel Emelyanov  *
16587af57294SPavel Emelyanov  * set_task_vxid()   : assigns a virtual id to a task;
16597af57294SPavel Emelyanov  *
16607af57294SPavel Emelyanov  * see also pid_nr() etc in include/linux/pid.h
16617af57294SPavel Emelyanov  */
166252ee2dfdSOleg Nesterov pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
166352ee2dfdSOleg Nesterov 			struct pid_namespace *ns);
16647af57294SPavel Emelyanov 
1665e868171aSAlexey Dobriyan static inline pid_t task_pid_nr(struct task_struct *tsk)
16667af57294SPavel Emelyanov {
16677af57294SPavel Emelyanov 	return tsk->pid;
16687af57294SPavel Emelyanov }
16697af57294SPavel Emelyanov 
167052ee2dfdSOleg Nesterov static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
167152ee2dfdSOleg Nesterov 					struct pid_namespace *ns)
167252ee2dfdSOleg Nesterov {
167352ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
167452ee2dfdSOleg Nesterov }
16757af57294SPavel Emelyanov 
16767af57294SPavel Emelyanov static inline pid_t task_pid_vnr(struct task_struct *tsk)
16777af57294SPavel Emelyanov {
167852ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
16797af57294SPavel Emelyanov }
16807af57294SPavel Emelyanov 
16817af57294SPavel Emelyanov 
1682e868171aSAlexey Dobriyan static inline pid_t task_tgid_nr(struct task_struct *tsk)
16837af57294SPavel Emelyanov {
16847af57294SPavel Emelyanov 	return tsk->tgid;
16857af57294SPavel Emelyanov }
16867af57294SPavel Emelyanov 
16872f2a3a46SPavel Emelyanov pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
16887af57294SPavel Emelyanov 
16897af57294SPavel Emelyanov static inline pid_t task_tgid_vnr(struct task_struct *tsk)
16907af57294SPavel Emelyanov {
16917af57294SPavel Emelyanov 	return pid_vnr(task_tgid(tsk));
16927af57294SPavel Emelyanov }
16937af57294SPavel Emelyanov 
16947af57294SPavel Emelyanov 
169552ee2dfdSOleg Nesterov static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
169652ee2dfdSOleg Nesterov 					struct pid_namespace *ns)
16977af57294SPavel Emelyanov {
169852ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
16997af57294SPavel Emelyanov }
17007af57294SPavel Emelyanov 
17017af57294SPavel Emelyanov static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
17027af57294SPavel Emelyanov {
170352ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
17047af57294SPavel Emelyanov }
17057af57294SPavel Emelyanov 
17067af57294SPavel Emelyanov 
170752ee2dfdSOleg Nesterov static inline pid_t task_session_nr_ns(struct task_struct *tsk,
170852ee2dfdSOleg Nesterov 					struct pid_namespace *ns)
17097af57294SPavel Emelyanov {
171052ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
17117af57294SPavel Emelyanov }
17127af57294SPavel Emelyanov 
17137af57294SPavel Emelyanov static inline pid_t task_session_vnr(struct task_struct *tsk)
17147af57294SPavel Emelyanov {
171552ee2dfdSOleg Nesterov 	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
17167af57294SPavel Emelyanov }
17177af57294SPavel Emelyanov 
17181b0f7ffdSOleg Nesterov /* obsolete, do not use */
17191b0f7ffdSOleg Nesterov static inline pid_t task_pgrp_nr(struct task_struct *tsk)
17201b0f7ffdSOleg Nesterov {
17211b0f7ffdSOleg Nesterov 	return task_pgrp_nr_ns(tsk, &init_pid_ns);
17221b0f7ffdSOleg Nesterov }
17237af57294SPavel Emelyanov 
17241da177e4SLinus Torvalds /**
17251da177e4SLinus Torvalds  * pid_alive - check that a task structure is not stale
17261da177e4SLinus Torvalds  * @p: Task structure to be checked.
17271da177e4SLinus Torvalds  *
17281da177e4SLinus Torvalds  * Test if a process is not yet dead (at most zombie state)
17291da177e4SLinus Torvalds  * If pid_alive fails, then pointers within the task structure
17301da177e4SLinus Torvalds  * can be stale and must not be dereferenced.
17311da177e4SLinus Torvalds  */
1732e868171aSAlexey Dobriyan static inline int pid_alive(struct task_struct *p)
17331da177e4SLinus Torvalds {
173492476d7fSEric W. Biederman 	return p->pids[PIDTYPE_PID].pid != NULL;
17351da177e4SLinus Torvalds }
17361da177e4SLinus Torvalds 
1737f400e198SSukadev Bhattiprolu /**
1738b460cbc5SSerge E. Hallyn  * is_global_init - check if a task structure is init
17393260259fSHenne  * @tsk: Task structure to be checked.
17403260259fSHenne  *
17413260259fSHenne  * Check if a task structure is the first user space task the kernel created.
1742f400e198SSukadev Bhattiprolu  */
1743e868171aSAlexey Dobriyan static inline int is_global_init(struct task_struct *tsk)
1744b461cc03SPavel Emelyanov {
1745b461cc03SPavel Emelyanov 	return tsk->pid == 1;
1746b461cc03SPavel Emelyanov }
1747b460cbc5SSerge E. Hallyn 
1748b460cbc5SSerge E. Hallyn /*
1749b460cbc5SSerge E. Hallyn  * is_container_init:
1750b460cbc5SSerge E. Hallyn  * check whether in the task is init in its own pid namespace.
1751b460cbc5SSerge E. Hallyn  */
1752b461cc03SPavel Emelyanov extern int is_container_init(struct task_struct *tsk);
1753f400e198SSukadev Bhattiprolu 
17549ec52099SCedric Le Goater extern struct pid *cad_pid;
17559ec52099SCedric Le Goater 
17561da177e4SLinus Torvalds extern void free_task(struct task_struct *tsk);
17571da177e4SLinus Torvalds #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1758e56d0903SIngo Molnar 
1759158d9ebdSAndrew Morton extern void __put_task_struct(struct task_struct *t);
1760e56d0903SIngo Molnar 
1761e56d0903SIngo Molnar static inline void put_task_struct(struct task_struct *t)
1762e56d0903SIngo Molnar {
1763e56d0903SIngo Molnar 	if (atomic_dec_and_test(&t->usage))
17648c7904a0SEric W. Biederman 		__put_task_struct(t);
1765e56d0903SIngo Molnar }
17661da177e4SLinus Torvalds 
1767d180c5bcSHidetoshi Seto extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
17680cf55e1eSHidetoshi Seto extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
176949048622SBalbir Singh 
17701da177e4SLinus Torvalds /*
17711da177e4SLinus Torvalds  * Per process flags
17721da177e4SLinus Torvalds  */
17731da177e4SLinus Torvalds #define PF_EXITING	0x00000004	/* getting shut down */
1774778e9a9cSAlexey Kuznetsov #define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
177594886b84SLaurent Vivier #define PF_VCPU		0x00000010	/* I'm a virtual CPU */
177621aa9af0STejun Heo #define PF_WQ_WORKER	0x00000020	/* I'm a workqueue worker */
17771da177e4SLinus Torvalds #define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
17784db96cf0SAndi Kleen #define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
17791da177e4SLinus Torvalds #define PF_SUPERPRIV	0x00000100	/* used super-user privileges */
17801da177e4SLinus Torvalds #define PF_DUMPCORE	0x00000200	/* dumped core */
17811da177e4SLinus Torvalds #define PF_SIGNALED	0x00000400	/* killed by a signal */
17821da177e4SLinus Torvalds #define PF_MEMALLOC	0x00000800	/* Allocating memory */
178372fa5997SVasiliy Kulikov #define PF_NPROC_EXCEEDED 0x00001000	/* set_user noticed that RLIMIT_NPROC was exceeded */
17841da177e4SLinus Torvalds #define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
17851da177e4SLinus Torvalds #define PF_NOFREEZE	0x00008000	/* this thread should not be frozen */
17861da177e4SLinus Torvalds #define PF_FROZEN	0x00010000	/* frozen for system suspend */
17871da177e4SLinus Torvalds #define PF_FSTRANS	0x00020000	/* inside a filesystem transaction */
17881da177e4SLinus Torvalds #define PF_KSWAPD	0x00040000	/* I am kswapd */
17891da177e4SLinus Torvalds #define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
1790246bb0b1SOleg Nesterov #define PF_KTHREAD	0x00200000	/* I am a kernel thread */
1791b31dc66aSJens Axboe #define PF_RANDOMIZE	0x00400000	/* randomize virtual address space */
1792b31dc66aSJens Axboe #define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
1793b31dc66aSJens Axboe #define PF_SPREAD_PAGE	0x01000000	/* Spread page cache over cpuset */
1794b31dc66aSJens Axboe #define PF_SPREAD_SLAB	0x02000000	/* Spread some slab caches over cpuset */
17959985b0baSDavid Rientjes #define PF_THREAD_BOUND	0x04000000	/* Thread bound to specific cpu */
17964db96cf0SAndi Kleen #define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
1797c61afb18SPaul Jackson #define PF_MEMPOLICY	0x10000000	/* Non-default NUMA mempolicy */
179861a87122SThomas Gleixner #define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
179958a69cb4STejun Heo #define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezable */
18001da177e4SLinus Torvalds 
18011da177e4SLinus Torvalds /*
18021da177e4SLinus Torvalds  * Only the _current_ task can read/write to tsk->flags, but other
18031da177e4SLinus Torvalds  * tasks can access tsk->flags in readonly mode for example
18041da177e4SLinus Torvalds  * with tsk_used_math (like during threaded core dumping).
18051da177e4SLinus Torvalds  * There is however an exception to this rule during ptrace
18061da177e4SLinus Torvalds  * or during fork: the ptracer task is allowed to write to the
18071da177e4SLinus Torvalds  * child->flags of its traced child (same goes for fork, the parent
18081da177e4SLinus Torvalds  * can write to the child->flags), because we're guaranteed the
18091da177e4SLinus Torvalds  * child is not running and in turn not changing child->flags
18101da177e4SLinus Torvalds  * at the same time the parent does it.
18111da177e4SLinus Torvalds  */
18121da177e4SLinus Torvalds #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
18131da177e4SLinus Torvalds #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
18141da177e4SLinus Torvalds #define clear_used_math() clear_stopped_child_used_math(current)
18151da177e4SLinus Torvalds #define set_used_math() set_stopped_child_used_math(current)
18161da177e4SLinus Torvalds #define conditional_stopped_child_used_math(condition, child) \
18171da177e4SLinus Torvalds 	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
18181da177e4SLinus Torvalds #define conditional_used_math(condition) \
18191da177e4SLinus Torvalds 	conditional_stopped_child_used_math(condition, current)
18201da177e4SLinus Torvalds #define copy_to_stopped_child_used_math(child) \
18211da177e4SLinus Torvalds 	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
18221da177e4SLinus Torvalds /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
18231da177e4SLinus Torvalds #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
18241da177e4SLinus Torvalds #define used_math() tsk_used_math(current)
18251da177e4SLinus Torvalds 
1826e5c1902eSTejun Heo /*
1827a8f072c1STejun Heo  * task->jobctl flags
1828e5c1902eSTejun Heo  */
1829a8f072c1STejun Heo #define JOBCTL_STOP_SIGMASK	0xffff	/* signr of the last group stop */
1830e5c1902eSTejun Heo 
1831a8f072c1STejun Heo #define JOBCTL_STOP_DEQUEUED_BIT 16	/* stop signal dequeued */
1832a8f072c1STejun Heo #define JOBCTL_STOP_PENDING_BIT	17	/* task should stop for group stop */
1833a8f072c1STejun Heo #define JOBCTL_STOP_CONSUME_BIT	18	/* consume group stop count */
183473ddff2bSTejun Heo #define JOBCTL_TRAP_STOP_BIT	19	/* trap for STOP */
1835fb1d910cSTejun Heo #define JOBCTL_TRAP_NOTIFY_BIT	20	/* trap for NOTIFY */
1836a8f072c1STejun Heo #define JOBCTL_TRAPPING_BIT	21	/* switching to TRACED */
1837544b2c91STejun Heo #define JOBCTL_LISTENING_BIT	22	/* ptracer is listening for events */
1838a8f072c1STejun Heo 
1839a8f072c1STejun Heo #define JOBCTL_STOP_DEQUEUED	(1 << JOBCTL_STOP_DEQUEUED_BIT)
1840a8f072c1STejun Heo #define JOBCTL_STOP_PENDING	(1 << JOBCTL_STOP_PENDING_BIT)
1841a8f072c1STejun Heo #define JOBCTL_STOP_CONSUME	(1 << JOBCTL_STOP_CONSUME_BIT)
184273ddff2bSTejun Heo #define JOBCTL_TRAP_STOP	(1 << JOBCTL_TRAP_STOP_BIT)
1843fb1d910cSTejun Heo #define JOBCTL_TRAP_NOTIFY	(1 << JOBCTL_TRAP_NOTIFY_BIT)
1844a8f072c1STejun Heo #define JOBCTL_TRAPPING		(1 << JOBCTL_TRAPPING_BIT)
1845544b2c91STejun Heo #define JOBCTL_LISTENING	(1 << JOBCTL_LISTENING_BIT)
1846a8f072c1STejun Heo 
1847fb1d910cSTejun Heo #define JOBCTL_TRAP_MASK	(JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
184873ddff2bSTejun Heo #define JOBCTL_PENDING_MASK	(JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
18493759a0d9STejun Heo 
18507dd3db54STejun Heo extern bool task_set_jobctl_pending(struct task_struct *task,
18517dd3db54STejun Heo 				    unsigned int mask);
185273ddff2bSTejun Heo extern void task_clear_jobctl_trapping(struct task_struct *task);
18533759a0d9STejun Heo extern void task_clear_jobctl_pending(struct task_struct *task,
18543759a0d9STejun Heo 				      unsigned int mask);
185539efa3efSTejun Heo 
1856a57eb940SPaul E. McKenney #ifdef CONFIG_PREEMPT_RCU
1857f41d911fSPaul E. McKenney 
1858f41d911fSPaul E. McKenney #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
18591aa03f11SPaul E. McKenney #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */
1860f41d911fSPaul E. McKenney 
1861f41d911fSPaul E. McKenney static inline void rcu_copy_process(struct task_struct *p)
1862f41d911fSPaul E. McKenney {
1863f41d911fSPaul E. McKenney 	p->rcu_read_lock_nesting = 0;
1864f41d911fSPaul E. McKenney 	p->rcu_read_unlock_special = 0;
1865a57eb940SPaul E. McKenney #ifdef CONFIG_TREE_PREEMPT_RCU
1866dd5d19baSPaul E. McKenney 	p->rcu_blocked_node = NULL;
186724278d14SPaul E. McKenney #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
186824278d14SPaul E. McKenney #ifdef CONFIG_RCU_BOOST
186924278d14SPaul E. McKenney 	p->rcu_boost_mutex = NULL;
187024278d14SPaul E. McKenney #endif /* #ifdef CONFIG_RCU_BOOST */
1871f41d911fSPaul E. McKenney 	INIT_LIST_HEAD(&p->rcu_node_entry);
1872f41d911fSPaul E. McKenney }
1873f41d911fSPaul E. McKenney 
1874616c310eSPaul E. McKenney static inline void rcu_switch_from(struct task_struct *prev)
1875616c310eSPaul E. McKenney {
1876616c310eSPaul E. McKenney 	if (prev->rcu_read_lock_nesting != 0)
1877616c310eSPaul E. McKenney 		rcu_preempt_note_context_switch();
1878616c310eSPaul E. McKenney }
1879616c310eSPaul E. McKenney 
1880f41d911fSPaul E. McKenney #else
1881f41d911fSPaul E. McKenney 
1882f41d911fSPaul E. McKenney static inline void rcu_copy_process(struct task_struct *p)
1883f41d911fSPaul E. McKenney {
1884f41d911fSPaul E. McKenney }
1885f41d911fSPaul E. McKenney 
1886616c310eSPaul E. McKenney static inline void rcu_switch_from(struct task_struct *prev)
1887616c310eSPaul E. McKenney {
1888616c310eSPaul E. McKenney }
1889616c310eSPaul E. McKenney 
1890f41d911fSPaul E. McKenney #endif
1891f41d911fSPaul E. McKenney 
18921da177e4SLinus Torvalds #ifdef CONFIG_SMP
18931e1b6c51SKOSAKI Motohiro extern void do_set_cpus_allowed(struct task_struct *p,
18941e1b6c51SKOSAKI Motohiro 			       const struct cpumask *new_mask);
18951e1b6c51SKOSAKI Motohiro 
1896cd8ba7cdSMike Travis extern int set_cpus_allowed_ptr(struct task_struct *p,
189796f874e2SRusty Russell 				const struct cpumask *new_mask);
18981da177e4SLinus Torvalds #else
18991e1b6c51SKOSAKI Motohiro static inline void do_set_cpus_allowed(struct task_struct *p,
19001e1b6c51SKOSAKI Motohiro 				      const struct cpumask *new_mask)
19011e1b6c51SKOSAKI Motohiro {
19021e1b6c51SKOSAKI Motohiro }
1903cd8ba7cdSMike Travis static inline int set_cpus_allowed_ptr(struct task_struct *p,
190496f874e2SRusty Russell 				       const struct cpumask *new_mask)
19051da177e4SLinus Torvalds {
190696f874e2SRusty Russell 	if (!cpumask_test_cpu(0, new_mask))
19071da177e4SLinus Torvalds 		return -EINVAL;
19081da177e4SLinus Torvalds 	return 0;
19091da177e4SLinus Torvalds }
19101da177e4SLinus Torvalds #endif
1911e0ad9556SRusty Russell 
1912e0ad9556SRusty Russell #ifndef CONFIG_CPUMASK_OFFSTACK
1913cd8ba7cdSMike Travis static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1914cd8ba7cdSMike Travis {
1915cd8ba7cdSMike Travis 	return set_cpus_allowed_ptr(p, &new_mask);
1916cd8ba7cdSMike Travis }
1917e0ad9556SRusty Russell #endif
19181da177e4SLinus Torvalds 
1919b342501cSIngo Molnar /*
1920c676329aSPeter Zijlstra  * Do not use outside of architecture code which knows its limitations.
1921c676329aSPeter Zijlstra  *
1922c676329aSPeter Zijlstra  * sched_clock() has no promise of monotonicity or bounded drift between
1923c676329aSPeter Zijlstra  * CPUs, use (which you should not) requires disabling IRQs.
1924c676329aSPeter Zijlstra  *
1925c676329aSPeter Zijlstra  * Please use one of the three interfaces below.
1926b342501cSIngo Molnar  */
19271bbfa6f2SMike Frysinger extern unsigned long long notrace sched_clock(void);
1928c676329aSPeter Zijlstra /*
1929489a71b0SHiroshi Shimamoto  * See the comment in kernel/sched/clock.c
1930c676329aSPeter Zijlstra  */
1931c676329aSPeter Zijlstra extern u64 cpu_clock(int cpu);
1932c676329aSPeter Zijlstra extern u64 local_clock(void);
1933c676329aSPeter Zijlstra extern u64 sched_clock_cpu(int cpu);
1934c676329aSPeter Zijlstra 
1935e436d800SIngo Molnar 
1936c1955a3dSPeter Zijlstra extern void sched_clock_init(void);
1937c1955a3dSPeter Zijlstra 
19383e51f33fSPeter Zijlstra #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
19393e51f33fSPeter Zijlstra static inline void sched_clock_tick(void)
19403e51f33fSPeter Zijlstra {
19413e51f33fSPeter Zijlstra }
19423e51f33fSPeter Zijlstra 
19433e51f33fSPeter Zijlstra static inline void sched_clock_idle_sleep_event(void)
19443e51f33fSPeter Zijlstra {
19453e51f33fSPeter Zijlstra }
19463e51f33fSPeter Zijlstra 
19473e51f33fSPeter Zijlstra static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
19483e51f33fSPeter Zijlstra {
19493e51f33fSPeter Zijlstra }
19503e51f33fSPeter Zijlstra #else
1951c676329aSPeter Zijlstra /*
1952c676329aSPeter Zijlstra  * Architectures can set this to 1 if they have specified
1953c676329aSPeter Zijlstra  * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1954c676329aSPeter Zijlstra  * but then during bootup it turns out that sched_clock()
1955c676329aSPeter Zijlstra  * is reliable after all:
1956c676329aSPeter Zijlstra  */
1957c676329aSPeter Zijlstra extern int sched_clock_stable;
1958c676329aSPeter Zijlstra 
19593e51f33fSPeter Zijlstra extern void sched_clock_tick(void);
19603e51f33fSPeter Zijlstra extern void sched_clock_idle_sleep_event(void);
19613e51f33fSPeter Zijlstra extern void sched_clock_idle_wakeup_event(u64 delta_ns);
19623e51f33fSPeter Zijlstra #endif
19633e51f33fSPeter Zijlstra 
1964b52bfee4SVenkatesh Pallipadi #ifdef CONFIG_IRQ_TIME_ACCOUNTING
1965b52bfee4SVenkatesh Pallipadi /*
1966b52bfee4SVenkatesh Pallipadi  * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1967b52bfee4SVenkatesh Pallipadi  * The reason for this explicit opt-in is not to have perf penalty with
1968b52bfee4SVenkatesh Pallipadi  * slow sched_clocks.
1969b52bfee4SVenkatesh Pallipadi  */
1970b52bfee4SVenkatesh Pallipadi extern void enable_sched_clock_irqtime(void);
1971b52bfee4SVenkatesh Pallipadi extern void disable_sched_clock_irqtime(void);
1972b52bfee4SVenkatesh Pallipadi #else
1973b52bfee4SVenkatesh Pallipadi static inline void enable_sched_clock_irqtime(void) {}
1974b52bfee4SVenkatesh Pallipadi static inline void disable_sched_clock_irqtime(void) {}
1975b52bfee4SVenkatesh Pallipadi #endif
1976b52bfee4SVenkatesh Pallipadi 
197736c8b586SIngo Molnar extern unsigned long long
197841b86e9cSIngo Molnar task_sched_runtime(struct task_struct *task);
19791da177e4SLinus Torvalds 
19801da177e4SLinus Torvalds /* sched_exec is called by processes performing an exec */
19811da177e4SLinus Torvalds #ifdef CONFIG_SMP
19821da177e4SLinus Torvalds extern void sched_exec(void);
19831da177e4SLinus Torvalds #else
19841da177e4SLinus Torvalds #define sched_exec()   {}
19851da177e4SLinus Torvalds #endif
19861da177e4SLinus Torvalds 
19872aa44d05SIngo Molnar extern void sched_clock_idle_sleep_event(void);
19882aa44d05SIngo Molnar extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1989bb29ab26SIngo Molnar 
19901da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU
19911da177e4SLinus Torvalds extern void idle_task_exit(void);
19921da177e4SLinus Torvalds #else
19931da177e4SLinus Torvalds static inline void idle_task_exit(void) {}
19941da177e4SLinus Torvalds #endif
19951da177e4SLinus Torvalds 
199606d8308cSThomas Gleixner #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
199706d8308cSThomas Gleixner extern void wake_up_idle_cpu(int cpu);
199806d8308cSThomas Gleixner #else
199906d8308cSThomas Gleixner static inline void wake_up_idle_cpu(int cpu) { }
200006d8308cSThomas Gleixner #endif
200106d8308cSThomas Gleixner 
200221805085SPeter Zijlstra extern unsigned int sysctl_sched_latency;
2003b2be5e96SPeter Zijlstra extern unsigned int sysctl_sched_min_granularity;
2004bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_wakeup_granularity;
2005bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_child_runs_first;
20061983a922SChristian Ehrhardt 
20071983a922SChristian Ehrhardt enum sched_tunable_scaling {
20081983a922SChristian Ehrhardt 	SCHED_TUNABLESCALING_NONE,
20091983a922SChristian Ehrhardt 	SCHED_TUNABLESCALING_LOG,
20101983a922SChristian Ehrhardt 	SCHED_TUNABLESCALING_LINEAR,
20111983a922SChristian Ehrhardt 	SCHED_TUNABLESCALING_END,
20121983a922SChristian Ehrhardt };
20131983a922SChristian Ehrhardt extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
20141983a922SChristian Ehrhardt 
20152bba22c5SMike Galbraith #ifdef CONFIG_SCHED_DEBUG
2016da84d961SIngo Molnar extern unsigned int sysctl_sched_migration_cost;
2017b82d9fddSPeter Zijlstra extern unsigned int sysctl_sched_nr_migrate;
2018e9e9250bSPeter Zijlstra extern unsigned int sysctl_sched_time_avg;
2019cd1bb94bSArun R Bharadwaj extern unsigned int sysctl_timer_migration;
2020a7a4f8a7SPaul Turner extern unsigned int sysctl_sched_shares_window;
2021b2be5e96SPeter Zijlstra 
20221983a922SChristian Ehrhardt int sched_proc_update_handler(struct ctl_table *table, int write,
20238d65af78SAlexey Dobriyan 		void __user *buffer, size_t *length,
2024b2be5e96SPeter Zijlstra 		loff_t *ppos);
20252bd8e6d4SIngo Molnar #endif
2026eea08f32SArun R Bharadwaj #ifdef CONFIG_SCHED_DEBUG
2027eea08f32SArun R Bharadwaj static inline unsigned int get_sysctl_timer_migration(void)
2028eea08f32SArun R Bharadwaj {
2029eea08f32SArun R Bharadwaj 	return sysctl_timer_migration;
2030eea08f32SArun R Bharadwaj }
2031eea08f32SArun R Bharadwaj #else
2032eea08f32SArun R Bharadwaj static inline unsigned int get_sysctl_timer_migration(void)
2033eea08f32SArun R Bharadwaj {
2034eea08f32SArun R Bharadwaj 	return 1;
2035eea08f32SArun R Bharadwaj }
2036eea08f32SArun R Bharadwaj #endif
20379f0c1e56SPeter Zijlstra extern unsigned int sysctl_sched_rt_period;
20389f0c1e56SPeter Zijlstra extern int sysctl_sched_rt_runtime;
20392bd8e6d4SIngo Molnar 
2040d0b27fa7SPeter Zijlstra int sched_rt_handler(struct ctl_table *table, int write,
20418d65af78SAlexey Dobriyan 		void __user *buffer, size_t *lenp,
2042d0b27fa7SPeter Zijlstra 		loff_t *ppos);
2043d0b27fa7SPeter Zijlstra 
20445091faa4SMike Galbraith #ifdef CONFIG_SCHED_AUTOGROUP
20455091faa4SMike Galbraith extern unsigned int sysctl_sched_autogroup_enabled;
20465091faa4SMike Galbraith 
20475091faa4SMike Galbraith extern void sched_autogroup_create_attach(struct task_struct *p);
20485091faa4SMike Galbraith extern void sched_autogroup_detach(struct task_struct *p);
20495091faa4SMike Galbraith extern void sched_autogroup_fork(struct signal_struct *sig);
20505091faa4SMike Galbraith extern void sched_autogroup_exit(struct signal_struct *sig);
20515091faa4SMike Galbraith #ifdef CONFIG_PROC_FS
20525091faa4SMike Galbraith extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
20532e5b5b3aSHiroshi Shimamoto extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
20545091faa4SMike Galbraith #endif
20555091faa4SMike Galbraith #else
20565091faa4SMike Galbraith static inline void sched_autogroup_create_attach(struct task_struct *p) { }
20575091faa4SMike Galbraith static inline void sched_autogroup_detach(struct task_struct *p) { }
20585091faa4SMike Galbraith static inline void sched_autogroup_fork(struct signal_struct *sig) { }
20595091faa4SMike Galbraith static inline void sched_autogroup_exit(struct signal_struct *sig) { }
20605091faa4SMike Galbraith #endif
20615091faa4SMike Galbraith 
2062ec12cb7fSPaul Turner #ifdef CONFIG_CFS_BANDWIDTH
2063ec12cb7fSPaul Turner extern unsigned int sysctl_sched_cfs_bandwidth_slice;
2064ec12cb7fSPaul Turner #endif
2065ec12cb7fSPaul Turner 
2066b29739f9SIngo Molnar #ifdef CONFIG_RT_MUTEXES
206736c8b586SIngo Molnar extern int rt_mutex_getprio(struct task_struct *p);
206836c8b586SIngo Molnar extern void rt_mutex_setprio(struct task_struct *p, int prio);
206936c8b586SIngo Molnar extern void rt_mutex_adjust_pi(struct task_struct *p);
20703c7d5184SThomas Gleixner static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
20713c7d5184SThomas Gleixner {
20723c7d5184SThomas Gleixner 	return tsk->pi_blocked_on != NULL;
20733c7d5184SThomas Gleixner }
2074b29739f9SIngo Molnar #else
2075e868171aSAlexey Dobriyan static inline int rt_mutex_getprio(struct task_struct *p)
2076b29739f9SIngo Molnar {
2077b29739f9SIngo Molnar 	return p->normal_prio;
2078b29739f9SIngo Molnar }
207995e02ca9SThomas Gleixner # define rt_mutex_adjust_pi(p)		do { } while (0)
20803c7d5184SThomas Gleixner static inline bool tsk_is_pi_blocked(struct task_struct *tsk)
20813c7d5184SThomas Gleixner {
20823c7d5184SThomas Gleixner 	return false;
20833c7d5184SThomas Gleixner }
2084b29739f9SIngo Molnar #endif
2085b29739f9SIngo Molnar 
2086d95f4122SMike Galbraith extern bool yield_to(struct task_struct *p, bool preempt);
208736c8b586SIngo Molnar extern void set_user_nice(struct task_struct *p, long nice);
208836c8b586SIngo Molnar extern int task_prio(const struct task_struct *p);
208936c8b586SIngo Molnar extern int task_nice(const struct task_struct *p);
209036c8b586SIngo Molnar extern int can_nice(const struct task_struct *p, const int nice);
209136c8b586SIngo Molnar extern int task_curr(const struct task_struct *p);
20921da177e4SLinus Torvalds extern int idle_cpu(int cpu);
2093fe7de49fSKOSAKI Motohiro extern int sched_setscheduler(struct task_struct *, int,
2094fe7de49fSKOSAKI Motohiro 			      const struct sched_param *);
2095961ccdddSRusty Russell extern int sched_setscheduler_nocheck(struct task_struct *, int,
2096fe7de49fSKOSAKI Motohiro 				      const struct sched_param *);
209736c8b586SIngo Molnar extern struct task_struct *idle_task(int cpu);
2098c4f30608SPaul E. McKenney /**
2099c4f30608SPaul E. McKenney  * is_idle_task - is the specified task an idle task?
2100fa757281SRandy Dunlap  * @p: the task in question.
2101c4f30608SPaul E. McKenney  */
21027061ca3bSPaul E. McKenney static inline bool is_idle_task(const struct task_struct *p)
2103c4f30608SPaul E. McKenney {
2104c4f30608SPaul E. McKenney 	return p->pid == 0;
2105c4f30608SPaul E. McKenney }
210636c8b586SIngo Molnar extern struct task_struct *curr_task(int cpu);
210736c8b586SIngo Molnar extern void set_curr_task(int cpu, struct task_struct *p);
21081da177e4SLinus Torvalds 
21091da177e4SLinus Torvalds void yield(void);
21101da177e4SLinus Torvalds 
21111da177e4SLinus Torvalds /*
21121da177e4SLinus Torvalds  * The default (Linux) execution domain.
21131da177e4SLinus Torvalds  */
21141da177e4SLinus Torvalds extern struct exec_domain	default_exec_domain;
21151da177e4SLinus Torvalds 
21161da177e4SLinus Torvalds union thread_union {
21171da177e4SLinus Torvalds 	struct thread_info thread_info;
21181da177e4SLinus Torvalds 	unsigned long stack[THREAD_SIZE/sizeof(long)];
21191da177e4SLinus Torvalds };
21201da177e4SLinus Torvalds 
21211da177e4SLinus Torvalds #ifndef __HAVE_ARCH_KSTACK_END
21221da177e4SLinus Torvalds static inline int kstack_end(void *addr)
21231da177e4SLinus Torvalds {
21241da177e4SLinus Torvalds 	/* Reliable end of stack detection:
21251da177e4SLinus Torvalds 	 * Some APM bios versions misalign the stack
21261da177e4SLinus Torvalds 	 */
21271da177e4SLinus Torvalds 	return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
21281da177e4SLinus Torvalds }
21291da177e4SLinus Torvalds #endif
21301da177e4SLinus Torvalds 
21311da177e4SLinus Torvalds extern union thread_union init_thread_union;
21321da177e4SLinus Torvalds extern struct task_struct init_task;
21331da177e4SLinus Torvalds 
21341da177e4SLinus Torvalds extern struct   mm_struct init_mm;
21351da177e4SLinus Torvalds 
2136198fe21bSPavel Emelyanov extern struct pid_namespace init_pid_ns;
2137198fe21bSPavel Emelyanov 
2138198fe21bSPavel Emelyanov /*
2139198fe21bSPavel Emelyanov  * find a task by one of its numerical ids
2140198fe21bSPavel Emelyanov  *
2141198fe21bSPavel Emelyanov  * find_task_by_pid_ns():
2142198fe21bSPavel Emelyanov  *      finds a task by its pid in the specified namespace
2143228ebcbeSPavel Emelyanov  * find_task_by_vpid():
2144228ebcbeSPavel Emelyanov  *      finds a task by its virtual pid
2145198fe21bSPavel Emelyanov  *
2146e49859e7SPavel Emelyanov  * see also find_vpid() etc in include/linux/pid.h
2147198fe21bSPavel Emelyanov  */
2148198fe21bSPavel Emelyanov 
2149228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_vpid(pid_t nr);
2150228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2151228ebcbeSPavel Emelyanov 		struct pid_namespace *ns);
2152198fe21bSPavel Emelyanov 
21538520d7c7SOleg Nesterov extern void __set_special_pids(struct pid *pid);
21541da177e4SLinus Torvalds 
21551da177e4SLinus Torvalds /* per-UID process charging. */
21567b44ab97SEric W. Biederman extern struct user_struct * alloc_uid(kuid_t);
21571da177e4SLinus Torvalds static inline struct user_struct *get_uid(struct user_struct *u)
21581da177e4SLinus Torvalds {
21591da177e4SLinus Torvalds 	atomic_inc(&u->__count);
21601da177e4SLinus Torvalds 	return u;
21611da177e4SLinus Torvalds }
21621da177e4SLinus Torvalds extern void free_uid(struct user_struct *);
21631da177e4SLinus Torvalds 
21641da177e4SLinus Torvalds #include <asm/current.h>
21651da177e4SLinus Torvalds 
2166f0af911aSTorben Hohn extern void xtime_update(unsigned long ticks);
21671da177e4SLinus Torvalds 
2168b3c97528SHarvey Harrison extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2169b3c97528SHarvey Harrison extern int wake_up_process(struct task_struct *tsk);
21703e51e3edSSamir Bellabes extern void wake_up_new_task(struct task_struct *tsk);
21711da177e4SLinus Torvalds #ifdef CONFIG_SMP
21721da177e4SLinus Torvalds  extern void kick_process(struct task_struct *tsk);
21731da177e4SLinus Torvalds #else
21741da177e4SLinus Torvalds  static inline void kick_process(struct task_struct *tsk) { }
21751da177e4SLinus Torvalds #endif
21763e51e3edSSamir Bellabes extern void sched_fork(struct task_struct *p);
2177ad46c2c4SIngo Molnar extern void sched_dead(struct task_struct *p);
21781da177e4SLinus Torvalds 
21791da177e4SLinus Torvalds extern void proc_caches_init(void);
21801da177e4SLinus Torvalds extern void flush_signals(struct task_struct *);
21813bcac026SDavid Howells extern void __flush_signals(struct task_struct *);
218210ab825bSOleg Nesterov extern void ignore_signals(struct task_struct *);
21831da177e4SLinus Torvalds extern void flush_signal_handlers(struct task_struct *, int force_default);
21841da177e4SLinus Torvalds extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
21851da177e4SLinus Torvalds 
21861da177e4SLinus Torvalds static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
21871da177e4SLinus Torvalds {
21881da177e4SLinus Torvalds 	unsigned long flags;
21891da177e4SLinus Torvalds 	int ret;
21901da177e4SLinus Torvalds 
21911da177e4SLinus Torvalds 	spin_lock_irqsave(&tsk->sighand->siglock, flags);
21921da177e4SLinus Torvalds 	ret = dequeue_signal(tsk, mask, info);
21931da177e4SLinus Torvalds 	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
21941da177e4SLinus Torvalds 
21951da177e4SLinus Torvalds 	return ret;
21961da177e4SLinus Torvalds }
21971da177e4SLinus Torvalds 
21981da177e4SLinus Torvalds extern void block_all_signals(int (*notifier)(void *priv), void *priv,
21991da177e4SLinus Torvalds 			      sigset_t *mask);
22001da177e4SLinus Torvalds extern void unblock_all_signals(void);
22011da177e4SLinus Torvalds extern void release_task(struct task_struct * p);
22021da177e4SLinus Torvalds extern int send_sig_info(int, struct siginfo *, struct task_struct *);
22031da177e4SLinus Torvalds extern int force_sigsegv(int, struct task_struct *);
22041da177e4SLinus Torvalds extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2205c4b92fc1SEric W. Biederman extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2206c4b92fc1SEric W. Biederman extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2207d178bc3aSSerge Hallyn extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
2208d178bc3aSSerge Hallyn 				const struct cred *, u32);
2209c4b92fc1SEric W. Biederman extern int kill_pgrp(struct pid *pid, int sig, int priv);
2210c4b92fc1SEric W. Biederman extern int kill_pid(struct pid *pid, int sig, int priv);
2211c3de4b38SMatthew Wilcox extern int kill_proc_info(int, struct siginfo *, pid_t);
221286773473SOleg Nesterov extern __must_check bool do_notify_parent(struct task_struct *, int);
2213a7f0765eSOleg Nesterov extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
22141da177e4SLinus Torvalds extern void force_sig(int, struct task_struct *);
22151da177e4SLinus Torvalds extern int send_sig(int, struct task_struct *, int);
221609faef11SOleg Nesterov extern int zap_other_threads(struct task_struct *p);
22171da177e4SLinus Torvalds extern struct sigqueue *sigqueue_alloc(void);
22181da177e4SLinus Torvalds extern void sigqueue_free(struct sigqueue *);
2219ac5c2153SOleg Nesterov extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
22209ac95f2fSOleg Nesterov extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
22211da177e4SLinus Torvalds extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
22221da177e4SLinus Torvalds 
222351a7b448SAl Viro static inline void restore_saved_sigmask(void)
222451a7b448SAl Viro {
222551a7b448SAl Viro 	if (test_and_clear_restore_sigmask())
222677097ae5SAl Viro 		__set_current_blocked(&current->saved_sigmask);
222751a7b448SAl Viro }
222851a7b448SAl Viro 
2229b7f9a11aSAl Viro static inline sigset_t *sigmask_to_save(void)
2230b7f9a11aSAl Viro {
2231b7f9a11aSAl Viro 	sigset_t *res = &current->blocked;
2232b7f9a11aSAl Viro 	if (unlikely(test_restore_sigmask()))
2233b7f9a11aSAl Viro 		res = &current->saved_sigmask;
2234b7f9a11aSAl Viro 	return res;
2235b7f9a11aSAl Viro }
2236b7f9a11aSAl Viro 
22379ec52099SCedric Le Goater static inline int kill_cad_pid(int sig, int priv)
22389ec52099SCedric Le Goater {
22399ec52099SCedric Le Goater 	return kill_pid(cad_pid, sig, priv);
22409ec52099SCedric Le Goater }
22419ec52099SCedric Le Goater 
22421da177e4SLinus Torvalds /* These can be the second arg to send_sig_info/send_group_sig_info.  */
22431da177e4SLinus Torvalds #define SEND_SIG_NOINFO ((struct siginfo *) 0)
22441da177e4SLinus Torvalds #define SEND_SIG_PRIV	((struct siginfo *) 1)
22451da177e4SLinus Torvalds #define SEND_SIG_FORCED	((struct siginfo *) 2)
22461da177e4SLinus Torvalds 
22472a855dd0SSebastian Andrzej Siewior /*
22482a855dd0SSebastian Andrzej Siewior  * True if we are on the alternate signal stack.
22492a855dd0SSebastian Andrzej Siewior  */
22501da177e4SLinus Torvalds static inline int on_sig_stack(unsigned long sp)
22511da177e4SLinus Torvalds {
22522a855dd0SSebastian Andrzej Siewior #ifdef CONFIG_STACK_GROWSUP
22532a855dd0SSebastian Andrzej Siewior 	return sp >= current->sas_ss_sp &&
22542a855dd0SSebastian Andrzej Siewior 		sp - current->sas_ss_sp < current->sas_ss_size;
22552a855dd0SSebastian Andrzej Siewior #else
22562a855dd0SSebastian Andrzej Siewior 	return sp > current->sas_ss_sp &&
22572a855dd0SSebastian Andrzej Siewior 		sp - current->sas_ss_sp <= current->sas_ss_size;
22582a855dd0SSebastian Andrzej Siewior #endif
22591da177e4SLinus Torvalds }
22601da177e4SLinus Torvalds 
22611da177e4SLinus Torvalds static inline int sas_ss_flags(unsigned long sp)
22621da177e4SLinus Torvalds {
22631da177e4SLinus Torvalds 	return (current->sas_ss_size == 0 ? SS_DISABLE
22641da177e4SLinus Torvalds 		: on_sig_stack(sp) ? SS_ONSTACK : 0);
22651da177e4SLinus Torvalds }
22661da177e4SLinus Torvalds 
22671da177e4SLinus Torvalds /*
22681da177e4SLinus Torvalds  * Routines for handling mm_structs
22691da177e4SLinus Torvalds  */
22701da177e4SLinus Torvalds extern struct mm_struct * mm_alloc(void);
22711da177e4SLinus Torvalds 
22721da177e4SLinus Torvalds /* mmdrop drops the mm and the page tables */
2273b3c97528SHarvey Harrison extern void __mmdrop(struct mm_struct *);
22741da177e4SLinus Torvalds static inline void mmdrop(struct mm_struct * mm)
22751da177e4SLinus Torvalds {
22766fb43d7bSIngo Molnar 	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
22771da177e4SLinus Torvalds 		__mmdrop(mm);
22781da177e4SLinus Torvalds }
22791da177e4SLinus Torvalds 
22801da177e4SLinus Torvalds /* mmput gets rid of the mappings and all user-space */
22811da177e4SLinus Torvalds extern void mmput(struct mm_struct *);
22821da177e4SLinus Torvalds /* Grab a reference to a task's mm, if it is not already going away */
22831da177e4SLinus Torvalds extern struct mm_struct *get_task_mm(struct task_struct *task);
22848cdb878dSChristopher Yeoh /*
22858cdb878dSChristopher Yeoh  * Grab a reference to a task's mm, if it is not already going away
22868cdb878dSChristopher Yeoh  * and ptrace_may_access with the mode parameter passed to it
22878cdb878dSChristopher Yeoh  * succeeds.
22888cdb878dSChristopher Yeoh  */
22898cdb878dSChristopher Yeoh extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
22901da177e4SLinus Torvalds /* Remove the current tasks stale references to the old mm_struct */
22911da177e4SLinus Torvalds extern void mm_release(struct task_struct *, struct mm_struct *);
2292402b0862SCarsten Otte /* Allocate a new mm structure and copy contents from tsk->mm */
2293402b0862SCarsten Otte extern struct mm_struct *dup_mm(struct task_struct *tsk);
22941da177e4SLinus Torvalds 
22956f2c55b8SAlexey Dobriyan extern int copy_thread(unsigned long, unsigned long, unsigned long,
22966f2c55b8SAlexey Dobriyan 			struct task_struct *, struct pt_regs *);
22971da177e4SLinus Torvalds extern void flush_thread(void);
22981da177e4SLinus Torvalds extern void exit_thread(void);
22991da177e4SLinus Torvalds 
23001da177e4SLinus Torvalds extern void exit_files(struct task_struct *);
2301a7e5328aSOleg Nesterov extern void __cleanup_sighand(struct sighand_struct *);
2302cbaffba1SOleg Nesterov 
23031da177e4SLinus Torvalds extern void exit_itimers(struct signal_struct *);
2304cbaffba1SOleg Nesterov extern void flush_itimer_signals(void);
23051da177e4SLinus Torvalds 
23069402c95fSJoe Perches extern void do_group_exit(int);
23071da177e4SLinus Torvalds 
23081da177e4SLinus Torvalds extern void daemonize(const char *, ...);
23091da177e4SLinus Torvalds extern int allow_signal(int);
23101da177e4SLinus Torvalds extern int disallow_signal(int);
23111da177e4SLinus Torvalds 
2312d7627467SDavid Howells extern int do_execve(const char *,
2313d7627467SDavid Howells 		     const char __user * const __user *,
2314d7627467SDavid Howells 		     const char __user * const __user *, struct pt_regs *);
23151da177e4SLinus Torvalds extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
231636c8b586SIngo Molnar struct task_struct *fork_idle(int);
23171da177e4SLinus Torvalds 
23181da177e4SLinus Torvalds extern void set_task_comm(struct task_struct *tsk, char *from);
231959714d65SAndrew Morton extern char *get_task_comm(char *to, struct task_struct *tsk);
23201da177e4SLinus Torvalds 
23211da177e4SLinus Torvalds #ifdef CONFIG_SMP
2322317f3941SPeter Zijlstra void scheduler_ipi(void);
232385ba2d86SRoland McGrath extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
23241da177e4SLinus Torvalds #else
2325184748ccSPeter Zijlstra static inline void scheduler_ipi(void) { }
232685ba2d86SRoland McGrath static inline unsigned long wait_task_inactive(struct task_struct *p,
232785ba2d86SRoland McGrath 					       long match_state)
232885ba2d86SRoland McGrath {
232985ba2d86SRoland McGrath 	return 1;
233085ba2d86SRoland McGrath }
23311da177e4SLinus Torvalds #endif
23321da177e4SLinus Torvalds 
233305725f7eSJiri Pirko #define next_task(p) \
233405725f7eSJiri Pirko 	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
23351da177e4SLinus Torvalds 
23361da177e4SLinus Torvalds #define for_each_process(p) \
23371da177e4SLinus Torvalds 	for (p = &init_task ; (p = next_task(p)) != &init_task ; )
23381da177e4SLinus Torvalds 
23395bb459bbSOleg Nesterov extern bool current_is_single_threaded(void);
2340d84f4f99SDavid Howells 
23411da177e4SLinus Torvalds /*
23421da177e4SLinus Torvalds  * Careful: do_each_thread/while_each_thread is a double loop so
23431da177e4SLinus Torvalds  *          'break' will not work as expected - use goto instead.
23441da177e4SLinus Torvalds  */
23451da177e4SLinus Torvalds #define do_each_thread(g, t) \
23461da177e4SLinus Torvalds 	for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
23471da177e4SLinus Torvalds 
23481da177e4SLinus Torvalds #define while_each_thread(g, t) \
23491da177e4SLinus Torvalds 	while ((t = next_thread(t)) != g)
23501da177e4SLinus Torvalds 
23517e49827cSOleg Nesterov static inline int get_nr_threads(struct task_struct *tsk)
23527e49827cSOleg Nesterov {
2353b3ac022cSOleg Nesterov 	return tsk->signal->nr_threads;
23547e49827cSOleg Nesterov }
23557e49827cSOleg Nesterov 
2356087806b1SOleg Nesterov static inline bool thread_group_leader(struct task_struct *p)
2357087806b1SOleg Nesterov {
2358087806b1SOleg Nesterov 	return p->exit_signal >= 0;
2359087806b1SOleg Nesterov }
23601da177e4SLinus Torvalds 
23610804ef4bSEric W. Biederman /* Do to the insanities of de_thread it is possible for a process
23620804ef4bSEric W. Biederman  * to have the pid of the thread group leader without actually being
23630804ef4bSEric W. Biederman  * the thread group leader.  For iteration through the pids in proc
23640804ef4bSEric W. Biederman  * all we care about is that we have a task with the appropriate
23650804ef4bSEric W. Biederman  * pid, we don't actually care if we have the right task.
23660804ef4bSEric W. Biederman  */
2367e868171aSAlexey Dobriyan static inline int has_group_leader_pid(struct task_struct *p)
23680804ef4bSEric W. Biederman {
23690804ef4bSEric W. Biederman 	return p->pid == p->tgid;
23700804ef4bSEric W. Biederman }
23710804ef4bSEric W. Biederman 
2372bac0abd6SPavel Emelyanov static inline
2373bac0abd6SPavel Emelyanov int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2374bac0abd6SPavel Emelyanov {
2375bac0abd6SPavel Emelyanov 	return p1->tgid == p2->tgid;
2376bac0abd6SPavel Emelyanov }
2377bac0abd6SPavel Emelyanov 
237836c8b586SIngo Molnar static inline struct task_struct *next_thread(const struct task_struct *p)
237947e65328SOleg Nesterov {
238005725f7eSJiri Pirko 	return list_entry_rcu(p->thread_group.next,
238136c8b586SIngo Molnar 			      struct task_struct, thread_group);
238247e65328SOleg Nesterov }
238347e65328SOleg Nesterov 
2384e868171aSAlexey Dobriyan static inline int thread_group_empty(struct task_struct *p)
23851da177e4SLinus Torvalds {
238647e65328SOleg Nesterov 	return list_empty(&p->thread_group);
23871da177e4SLinus Torvalds }
23881da177e4SLinus Torvalds 
23891da177e4SLinus Torvalds #define delay_group_leader(p) \
23901da177e4SLinus Torvalds 		(thread_group_leader(p) && !thread_group_empty(p))
23911da177e4SLinus Torvalds 
23921da177e4SLinus Torvalds /*
2393260ea101SEric W. Biederman  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
239422e2c507SJens Axboe  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2395ddbcc7e8SPaul Menage  * pins the final release of task.io_context.  Also protects ->cpuset and
2396d68b46feSOleg Nesterov  * ->cgroup.subsys[]. And ->vfork_done.
23971da177e4SLinus Torvalds  *
23981da177e4SLinus Torvalds  * Nests both inside and outside of read_lock(&tasklist_lock).
23991da177e4SLinus Torvalds  * It must not be nested with write_lock_irq(&tasklist_lock),
24001da177e4SLinus Torvalds  * neither inside nor outside.
24011da177e4SLinus Torvalds  */
24021da177e4SLinus Torvalds static inline void task_lock(struct task_struct *p)
24031da177e4SLinus Torvalds {
24041da177e4SLinus Torvalds 	spin_lock(&p->alloc_lock);
24051da177e4SLinus Torvalds }
24061da177e4SLinus Torvalds 
24071da177e4SLinus Torvalds static inline void task_unlock(struct task_struct *p)
24081da177e4SLinus Torvalds {
24091da177e4SLinus Torvalds 	spin_unlock(&p->alloc_lock);
24101da177e4SLinus Torvalds }
24111da177e4SLinus Torvalds 
2412b8ed374eSNamhyung Kim extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2413f63ee72eSOleg Nesterov 							unsigned long *flags);
2414f63ee72eSOleg Nesterov 
24159388dc30SAnton Vorontsov static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
24169388dc30SAnton Vorontsov 						       unsigned long *flags)
24179388dc30SAnton Vorontsov {
24189388dc30SAnton Vorontsov 	struct sighand_struct *ret;
24199388dc30SAnton Vorontsov 
24209388dc30SAnton Vorontsov 	ret = __lock_task_sighand(tsk, flags);
24219388dc30SAnton Vorontsov 	(void)__cond_lock(&tsk->sighand->siglock, ret);
24229388dc30SAnton Vorontsov 	return ret;
24239388dc30SAnton Vorontsov }
2424b8ed374eSNamhyung Kim 
2425f63ee72eSOleg Nesterov static inline void unlock_task_sighand(struct task_struct *tsk,
2426f63ee72eSOleg Nesterov 						unsigned long *flags)
2427f63ee72eSOleg Nesterov {
2428f63ee72eSOleg Nesterov 	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2429f63ee72eSOleg Nesterov }
2430f63ee72eSOleg Nesterov 
24314714d1d3SBen Blum #ifdef CONFIG_CGROUPS
2432257058aeSTejun Heo static inline void threadgroup_change_begin(struct task_struct *tsk)
24334714d1d3SBen Blum {
2434257058aeSTejun Heo 	down_read(&tsk->signal->group_rwsem);
24354714d1d3SBen Blum }
2436257058aeSTejun Heo static inline void threadgroup_change_end(struct task_struct *tsk)
24374714d1d3SBen Blum {
2438257058aeSTejun Heo 	up_read(&tsk->signal->group_rwsem);
24394714d1d3SBen Blum }
244077e4ef99STejun Heo 
244177e4ef99STejun Heo /**
244277e4ef99STejun Heo  * threadgroup_lock - lock threadgroup
244377e4ef99STejun Heo  * @tsk: member task of the threadgroup to lock
244477e4ef99STejun Heo  *
244577e4ef99STejun Heo  * Lock the threadgroup @tsk belongs to.  No new task is allowed to enter
244677e4ef99STejun Heo  * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
244777e4ef99STejun Heo  * perform exec.  This is useful for cases where the threadgroup needs to
244877e4ef99STejun Heo  * stay stable across blockable operations.
244977e4ef99STejun Heo  *
245077e4ef99STejun Heo  * fork and exit paths explicitly call threadgroup_change_{begin|end}() for
245177e4ef99STejun Heo  * synchronization.  While held, no new task will be added to threadgroup
245277e4ef99STejun Heo  * and no existing live task will have its PF_EXITING set.
245377e4ef99STejun Heo  *
245477e4ef99STejun Heo  * During exec, a task goes and puts its thread group through unusual
245577e4ef99STejun Heo  * changes.  After de-threading, exclusive access is assumed to resources
245677e4ef99STejun Heo  * which are usually shared by tasks in the same group - e.g. sighand may
245777e4ef99STejun Heo  * be replaced with a new one.  Also, the exec'ing task takes over group
245877e4ef99STejun Heo  * leader role including its pid.  Exclude these changes while locked by
245977e4ef99STejun Heo  * grabbing cred_guard_mutex which is used to synchronize exec path.
246077e4ef99STejun Heo  */
2461257058aeSTejun Heo static inline void threadgroup_lock(struct task_struct *tsk)
24624714d1d3SBen Blum {
246377e4ef99STejun Heo 	/*
246477e4ef99STejun Heo 	 * exec uses exit for de-threading nesting group_rwsem inside
246577e4ef99STejun Heo 	 * cred_guard_mutex. Grab cred_guard_mutex first.
246677e4ef99STejun Heo 	 */
246777e4ef99STejun Heo 	mutex_lock(&tsk->signal->cred_guard_mutex);
2468257058aeSTejun Heo 	down_write(&tsk->signal->group_rwsem);
24694714d1d3SBen Blum }
247077e4ef99STejun Heo 
247177e4ef99STejun Heo /**
247277e4ef99STejun Heo  * threadgroup_unlock - unlock threadgroup
247377e4ef99STejun Heo  * @tsk: member task of the threadgroup to unlock
247477e4ef99STejun Heo  *
247577e4ef99STejun Heo  * Reverse threadgroup_lock().
247677e4ef99STejun Heo  */
2477257058aeSTejun Heo static inline void threadgroup_unlock(struct task_struct *tsk)
24784714d1d3SBen Blum {
2479257058aeSTejun Heo 	up_write(&tsk->signal->group_rwsem);
248077e4ef99STejun Heo 	mutex_unlock(&tsk->signal->cred_guard_mutex);
24814714d1d3SBen Blum }
24824714d1d3SBen Blum #else
2483257058aeSTejun Heo static inline void threadgroup_change_begin(struct task_struct *tsk) {}
2484257058aeSTejun Heo static inline void threadgroup_change_end(struct task_struct *tsk) {}
2485257058aeSTejun Heo static inline void threadgroup_lock(struct task_struct *tsk) {}
2486257058aeSTejun Heo static inline void threadgroup_unlock(struct task_struct *tsk) {}
24874714d1d3SBen Blum #endif
24884714d1d3SBen Blum 
2489f037360fSAl Viro #ifndef __HAVE_THREAD_FUNCTIONS
2490f037360fSAl Viro 
2491f7e4217bSRoman Zippel #define task_thread_info(task)	((struct thread_info *)(task)->stack)
2492f7e4217bSRoman Zippel #define task_stack_page(task)	((task)->stack)
2493a1261f54SAl Viro 
249410ebffdeSAl Viro static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
249510ebffdeSAl Viro {
249610ebffdeSAl Viro 	*task_thread_info(p) = *task_thread_info(org);
249710ebffdeSAl Viro 	task_thread_info(p)->task = p;
249810ebffdeSAl Viro }
249910ebffdeSAl Viro 
250010ebffdeSAl Viro static inline unsigned long *end_of_stack(struct task_struct *p)
250110ebffdeSAl Viro {
2502f7e4217bSRoman Zippel 	return (unsigned long *)(task_thread_info(p) + 1);
250310ebffdeSAl Viro }
250410ebffdeSAl Viro 
2505f037360fSAl Viro #endif
2506f037360fSAl Viro 
25078b05c7e6SFUJITA Tomonori static inline int object_is_on_stack(void *obj)
25088b05c7e6SFUJITA Tomonori {
25098b05c7e6SFUJITA Tomonori 	void *stack = task_stack_page(current);
25108b05c7e6SFUJITA Tomonori 
25118b05c7e6SFUJITA Tomonori 	return (obj >= stack) && (obj < (stack + THREAD_SIZE));
25128b05c7e6SFUJITA Tomonori }
25138b05c7e6SFUJITA Tomonori 
25148c9843e5SBenjamin Herrenschmidt extern void thread_info_cache_init(void);
25158c9843e5SBenjamin Herrenschmidt 
25167c9f8861SEric Sandeen #ifdef CONFIG_DEBUG_STACK_USAGE
25177c9f8861SEric Sandeen static inline unsigned long stack_not_used(struct task_struct *p)
25187c9f8861SEric Sandeen {
25197c9f8861SEric Sandeen 	unsigned long *n = end_of_stack(p);
25207c9f8861SEric Sandeen 
25217c9f8861SEric Sandeen 	do { 	/* Skip over canary */
25227c9f8861SEric Sandeen 		n++;
25237c9f8861SEric Sandeen 	} while (!*n);
25247c9f8861SEric Sandeen 
25257c9f8861SEric Sandeen 	return (unsigned long)n - (unsigned long)end_of_stack(p);
25267c9f8861SEric Sandeen }
25277c9f8861SEric Sandeen #endif
25287c9f8861SEric Sandeen 
25291da177e4SLinus Torvalds /* set thread flags in other task's structures
25301da177e4SLinus Torvalds  * - see asm/thread_info.h for TIF_xxxx flags available
25311da177e4SLinus Torvalds  */
25321da177e4SLinus Torvalds static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
25331da177e4SLinus Torvalds {
2534a1261f54SAl Viro 	set_ti_thread_flag(task_thread_info(tsk), flag);
25351da177e4SLinus Torvalds }
25361da177e4SLinus Torvalds 
25371da177e4SLinus Torvalds static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
25381da177e4SLinus Torvalds {
2539a1261f54SAl Viro 	clear_ti_thread_flag(task_thread_info(tsk), flag);
25401da177e4SLinus Torvalds }
25411da177e4SLinus Torvalds 
25421da177e4SLinus Torvalds static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
25431da177e4SLinus Torvalds {
2544a1261f54SAl Viro 	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
25451da177e4SLinus Torvalds }
25461da177e4SLinus Torvalds 
25471da177e4SLinus Torvalds static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
25481da177e4SLinus Torvalds {
2549a1261f54SAl Viro 	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
25501da177e4SLinus Torvalds }
25511da177e4SLinus Torvalds 
25521da177e4SLinus Torvalds static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
25531da177e4SLinus Torvalds {
2554a1261f54SAl Viro 	return test_ti_thread_flag(task_thread_info(tsk), flag);
25551da177e4SLinus Torvalds }
25561da177e4SLinus Torvalds 
25571da177e4SLinus Torvalds static inline void set_tsk_need_resched(struct task_struct *tsk)
25581da177e4SLinus Torvalds {
25591da177e4SLinus Torvalds 	set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
25601da177e4SLinus Torvalds }
25611da177e4SLinus Torvalds 
25621da177e4SLinus Torvalds static inline void clear_tsk_need_resched(struct task_struct *tsk)
25631da177e4SLinus Torvalds {
25641da177e4SLinus Torvalds 	clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
25651da177e4SLinus Torvalds }
25661da177e4SLinus Torvalds 
25678ae121acSGregory Haskins static inline int test_tsk_need_resched(struct task_struct *tsk)
25688ae121acSGregory Haskins {
25698ae121acSGregory Haskins 	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
25708ae121acSGregory Haskins }
25718ae121acSGregory Haskins 
2572690cc3ffSEric W. Biederman static inline int restart_syscall(void)
2573690cc3ffSEric W. Biederman {
2574690cc3ffSEric W. Biederman 	set_tsk_thread_flag(current, TIF_SIGPENDING);
2575690cc3ffSEric W. Biederman 	return -ERESTARTNOINTR;
2576690cc3ffSEric W. Biederman }
2577690cc3ffSEric W. Biederman 
25781da177e4SLinus Torvalds static inline int signal_pending(struct task_struct *p)
25791da177e4SLinus Torvalds {
25801da177e4SLinus Torvalds 	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
25811da177e4SLinus Torvalds }
25821da177e4SLinus Torvalds 
2583d9588725SRoland McGrath static inline int __fatal_signal_pending(struct task_struct *p)
2584d9588725SRoland McGrath {
2585d9588725SRoland McGrath 	return unlikely(sigismember(&p->pending.signal, SIGKILL));
2586d9588725SRoland McGrath }
2587f776d12dSMatthew Wilcox 
2588f776d12dSMatthew Wilcox static inline int fatal_signal_pending(struct task_struct *p)
2589f776d12dSMatthew Wilcox {
2590f776d12dSMatthew Wilcox 	return signal_pending(p) && __fatal_signal_pending(p);
2591f776d12dSMatthew Wilcox }
2592f776d12dSMatthew Wilcox 
259316882c1eSOleg Nesterov static inline int signal_pending_state(long state, struct task_struct *p)
259416882c1eSOleg Nesterov {
259516882c1eSOleg Nesterov 	if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
259616882c1eSOleg Nesterov 		return 0;
259716882c1eSOleg Nesterov 	if (!signal_pending(p))
259816882c1eSOleg Nesterov 		return 0;
259916882c1eSOleg Nesterov 
260016882c1eSOleg Nesterov 	return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
260116882c1eSOleg Nesterov }
260216882c1eSOleg Nesterov 
26031da177e4SLinus Torvalds static inline int need_resched(void)
26041da177e4SLinus Torvalds {
26059404ef02SLinus Torvalds 	return unlikely(test_thread_flag(TIF_NEED_RESCHED));
26061da177e4SLinus Torvalds }
26071da177e4SLinus Torvalds 
26081da177e4SLinus Torvalds /*
26091da177e4SLinus Torvalds  * cond_resched() and cond_resched_lock(): latency reduction via
26101da177e4SLinus Torvalds  * explicit rescheduling in places that are safe. The return
26111da177e4SLinus Torvalds  * value indicates whether a reschedule was done in fact.
26121da177e4SLinus Torvalds  * cond_resched_lock() will drop the spinlock before scheduling,
26131da177e4SLinus Torvalds  * cond_resched_softirq() will enable bhs before scheduling.
26141da177e4SLinus Torvalds  */
2615c3921ab7SLinus Torvalds extern int _cond_resched(void);
26166f80bd98SFrederic Weisbecker 
2617613afbf8SFrederic Weisbecker #define cond_resched() ({			\
2618613afbf8SFrederic Weisbecker 	__might_sleep(__FILE__, __LINE__, 0);	\
2619613afbf8SFrederic Weisbecker 	_cond_resched();			\
2620613afbf8SFrederic Weisbecker })
26216f80bd98SFrederic Weisbecker 
2622613afbf8SFrederic Weisbecker extern int __cond_resched_lock(spinlock_t *lock);
2623613afbf8SFrederic Weisbecker 
2624bdd4e85dSFrederic Weisbecker #ifdef CONFIG_PREEMPT_COUNT
2625716a4234SFrederic Weisbecker #define PREEMPT_LOCK_OFFSET	PREEMPT_OFFSET
262602b67cc3SHerbert Xu #else
2627716a4234SFrederic Weisbecker #define PREEMPT_LOCK_OFFSET	0
262802b67cc3SHerbert Xu #endif
2629716a4234SFrederic Weisbecker 
2630613afbf8SFrederic Weisbecker #define cond_resched_lock(lock) ({				\
2631716a4234SFrederic Weisbecker 	__might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);	\
2632613afbf8SFrederic Weisbecker 	__cond_resched_lock(lock);				\
2633613afbf8SFrederic Weisbecker })
2634613afbf8SFrederic Weisbecker 
2635613afbf8SFrederic Weisbecker extern int __cond_resched_softirq(void);
2636613afbf8SFrederic Weisbecker 
2637613afbf8SFrederic Weisbecker #define cond_resched_softirq() ({					\
263875e1056fSVenkatesh Pallipadi 	__might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);	\
2639613afbf8SFrederic Weisbecker 	__cond_resched_softirq();					\
2640613afbf8SFrederic Weisbecker })
26411da177e4SLinus Torvalds 
26421da177e4SLinus Torvalds /*
26431da177e4SLinus Torvalds  * Does a critical section need to be broken due to another
264495c354feSNick Piggin  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
264595c354feSNick Piggin  * but a general need for low latency)
26461da177e4SLinus Torvalds  */
264795c354feSNick Piggin static inline int spin_needbreak(spinlock_t *lock)
26481da177e4SLinus Torvalds {
264995c354feSNick Piggin #ifdef CONFIG_PREEMPT
265095c354feSNick Piggin 	return spin_is_contended(lock);
265195c354feSNick Piggin #else
26521da177e4SLinus Torvalds 	return 0;
265395c354feSNick Piggin #endif
26541da177e4SLinus Torvalds }
26551da177e4SLinus Torvalds 
26567bb44adeSRoland McGrath /*
2657f06febc9SFrank Mayhar  * Thread group CPU time accounting.
2658f06febc9SFrank Mayhar  */
26594cd4c1b4SPeter Zijlstra void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
26604da94d49SPeter Zijlstra void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2661f06febc9SFrank Mayhar 
2662f06febc9SFrank Mayhar static inline void thread_group_cputime_init(struct signal_struct *sig)
2663f06febc9SFrank Mayhar {
2664ee30a7b2SThomas Gleixner 	raw_spin_lock_init(&sig->cputimer.lock);
2665f06febc9SFrank Mayhar }
2666f06febc9SFrank Mayhar 
2667f06febc9SFrank Mayhar /*
26687bb44adeSRoland McGrath  * Reevaluate whether the task has signals pending delivery.
26697bb44adeSRoland McGrath  * Wake the task if so.
26707bb44adeSRoland McGrath  * This is required every time the blocked sigset_t changes.
26717bb44adeSRoland McGrath  * callers must hold sighand->siglock.
26727bb44adeSRoland McGrath  */
26737bb44adeSRoland McGrath extern void recalc_sigpending_and_wake(struct task_struct *t);
26741da177e4SLinus Torvalds extern void recalc_sigpending(void);
26751da177e4SLinus Torvalds 
26761da177e4SLinus Torvalds extern void signal_wake_up(struct task_struct *t, int resume_stopped);
26771da177e4SLinus Torvalds 
26781da177e4SLinus Torvalds /*
26791da177e4SLinus Torvalds  * Wrappers for p->thread_info->cpu access. No-op on UP.
26801da177e4SLinus Torvalds  */
26811da177e4SLinus Torvalds #ifdef CONFIG_SMP
26821da177e4SLinus Torvalds 
26831da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p)
26841da177e4SLinus Torvalds {
2685a1261f54SAl Viro 	return task_thread_info(p)->cpu;
26861da177e4SLinus Torvalds }
26871da177e4SLinus Torvalds 
2688c65cc870SIngo Molnar extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
26891da177e4SLinus Torvalds 
26901da177e4SLinus Torvalds #else
26911da177e4SLinus Torvalds 
26921da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p)
26931da177e4SLinus Torvalds {
26941da177e4SLinus Torvalds 	return 0;
26951da177e4SLinus Torvalds }
26961da177e4SLinus Torvalds 
26971da177e4SLinus Torvalds static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
26981da177e4SLinus Torvalds {
26991da177e4SLinus Torvalds }
27001da177e4SLinus Torvalds 
27011da177e4SLinus Torvalds #endif /* CONFIG_SMP */
27021da177e4SLinus Torvalds 
270396f874e2SRusty Russell extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
270496f874e2SRusty Russell extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
27055c45bf27SSiddha, Suresh B 
27061da177e4SLinus Torvalds extern void normalize_rt_tasks(void);
27071da177e4SLinus Torvalds 
27087c941438SDhaval Giani #ifdef CONFIG_CGROUP_SCHED
27099b5b7751SSrivatsa Vaddagiri 
271007e06b01SYong Zhang extern struct task_group root_task_group;
27119b5b7751SSrivatsa Vaddagiri 
2712ec7dc8acSDhaval Giani extern struct task_group *sched_create_group(struct task_group *parent);
27134cf86d77SIngo Molnar extern void sched_destroy_group(struct task_group *tg);
27149b5b7751SSrivatsa Vaddagiri extern void sched_move_task(struct task_struct *tsk);
2715052f1dc7SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED
27164cf86d77SIngo Molnar extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
27175cb350baSDhaval Giani extern unsigned long sched_group_shares(struct task_group *tg);
2718052f1dc7SPeter Zijlstra #endif
2719052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED
27209f0c1e56SPeter Zijlstra extern int sched_group_set_rt_runtime(struct task_group *tg,
27219f0c1e56SPeter Zijlstra 				      long rt_runtime_us);
27229f0c1e56SPeter Zijlstra extern long sched_group_rt_runtime(struct task_group *tg);
2723d0b27fa7SPeter Zijlstra extern int sched_group_set_rt_period(struct task_group *tg,
2724d0b27fa7SPeter Zijlstra 				      long rt_period_us);
2725d0b27fa7SPeter Zijlstra extern long sched_group_rt_period(struct task_group *tg);
272654e99124SDhaval Giani extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2727052f1dc7SPeter Zijlstra #endif
27289b5b7751SSrivatsa Vaddagiri #endif
27299b5b7751SSrivatsa Vaddagiri 
273054e99124SDhaval Giani extern int task_can_switch_user(struct user_struct *up,
273154e99124SDhaval Giani 					struct task_struct *tsk);
273254e99124SDhaval Giani 
27334b98d11bSAlexey Dobriyan #ifdef CONFIG_TASK_XACCT
27344b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
27354b98d11bSAlexey Dobriyan {
2736940389b8SAndrea Righi 	tsk->ioac.rchar += amt;
27374b98d11bSAlexey Dobriyan }
27384b98d11bSAlexey Dobriyan 
27394b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
27404b98d11bSAlexey Dobriyan {
2741940389b8SAndrea Righi 	tsk->ioac.wchar += amt;
27424b98d11bSAlexey Dobriyan }
27434b98d11bSAlexey Dobriyan 
27444b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk)
27454b98d11bSAlexey Dobriyan {
2746940389b8SAndrea Righi 	tsk->ioac.syscr++;
27474b98d11bSAlexey Dobriyan }
27484b98d11bSAlexey Dobriyan 
27494b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk)
27504b98d11bSAlexey Dobriyan {
2751940389b8SAndrea Righi 	tsk->ioac.syscw++;
27524b98d11bSAlexey Dobriyan }
27534b98d11bSAlexey Dobriyan #else
27544b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
27554b98d11bSAlexey Dobriyan {
27564b98d11bSAlexey Dobriyan }
27574b98d11bSAlexey Dobriyan 
27584b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
27594b98d11bSAlexey Dobriyan {
27604b98d11bSAlexey Dobriyan }
27614b98d11bSAlexey Dobriyan 
27624b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk)
27634b98d11bSAlexey Dobriyan {
27644b98d11bSAlexey Dobriyan }
27654b98d11bSAlexey Dobriyan 
27664b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk)
27674b98d11bSAlexey Dobriyan {
27684b98d11bSAlexey Dobriyan }
27694b98d11bSAlexey Dobriyan #endif
27704b98d11bSAlexey Dobriyan 
277182455257SDave Hansen #ifndef TASK_SIZE_OF
277282455257SDave Hansen #define TASK_SIZE_OF(tsk)	TASK_SIZE
277382455257SDave Hansen #endif
277482455257SDave Hansen 
2775cf475ad2SBalbir Singh #ifdef CONFIG_MM_OWNER
2776cf475ad2SBalbir Singh extern void mm_update_next_owner(struct mm_struct *mm);
2777cf475ad2SBalbir Singh extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2778cf475ad2SBalbir Singh #else
2779cf475ad2SBalbir Singh static inline void mm_update_next_owner(struct mm_struct *mm)
2780cf475ad2SBalbir Singh {
2781cf475ad2SBalbir Singh }
2782cf475ad2SBalbir Singh 
2783cf475ad2SBalbir Singh static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2784cf475ad2SBalbir Singh {
2785cf475ad2SBalbir Singh }
2786cf475ad2SBalbir Singh #endif /* CONFIG_MM_OWNER */
2787cf475ad2SBalbir Singh 
27883e10e716SJiri Slaby static inline unsigned long task_rlimit(const struct task_struct *tsk,
27893e10e716SJiri Slaby 		unsigned int limit)
27903e10e716SJiri Slaby {
27913e10e716SJiri Slaby 	return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
27923e10e716SJiri Slaby }
27933e10e716SJiri Slaby 
27943e10e716SJiri Slaby static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
27953e10e716SJiri Slaby 		unsigned int limit)
27963e10e716SJiri Slaby {
27973e10e716SJiri Slaby 	return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
27983e10e716SJiri Slaby }
27993e10e716SJiri Slaby 
28003e10e716SJiri Slaby static inline unsigned long rlimit(unsigned int limit)
28013e10e716SJiri Slaby {
28023e10e716SJiri Slaby 	return task_rlimit(current, limit);
28033e10e716SJiri Slaby }
28043e10e716SJiri Slaby 
28053e10e716SJiri Slaby static inline unsigned long rlimit_max(unsigned int limit)
28063e10e716SJiri Slaby {
28073e10e716SJiri Slaby 	return task_rlimit_max(current, limit);
28083e10e716SJiri Slaby }
28093e10e716SJiri Slaby 
28101da177e4SLinus Torvalds #endif /* __KERNEL__ */
28111da177e4SLinus Torvalds 
28121da177e4SLinus Torvalds #endif
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