1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_SCHED_H 3 #define _LINUX_SCHED_H 4 5 /* 6 * Define 'struct task_struct' and provide the main scheduler 7 * APIs (schedule(), wakeup variants, etc.) 8 */ 9 10 #include <uapi/linux/sched.h> 11 12 #include <asm/current.h> 13 14 #include <linux/pid.h> 15 #include <linux/sem.h> 16 #include <linux/shm.h> 17 #include <linux/kcov.h> 18 #include <linux/mutex.h> 19 #include <linux/plist.h> 20 #include <linux/hrtimer.h> 21 #include <linux/seccomp.h> 22 #include <linux/nodemask.h> 23 #include <linux/rcupdate.h> 24 #include <linux/refcount.h> 25 #include <linux/resource.h> 26 #include <linux/latencytop.h> 27 #include <linux/sched/prio.h> 28 #include <linux/sched/types.h> 29 #include <linux/signal_types.h> 30 #include <linux/mm_types_task.h> 31 #include <linux/task_io_accounting.h> 32 #include <linux/posix-timers.h> 33 #include <linux/rseq.h> 34 35 /* task_struct member predeclarations (sorted alphabetically): */ 36 struct audit_context; 37 struct backing_dev_info; 38 struct bio_list; 39 struct blk_plug; 40 struct capture_control; 41 struct cfs_rq; 42 struct fs_struct; 43 struct futex_pi_state; 44 struct io_context; 45 struct mempolicy; 46 struct nameidata; 47 struct nsproxy; 48 struct perf_event_context; 49 struct pid_namespace; 50 struct pipe_inode_info; 51 struct rcu_node; 52 struct reclaim_state; 53 struct robust_list_head; 54 struct root_domain; 55 struct rq; 56 struct sched_attr; 57 struct sched_param; 58 struct seq_file; 59 struct sighand_struct; 60 struct signal_struct; 61 struct task_delay_info; 62 struct task_group; 63 64 /* 65 * Task state bitmask. NOTE! These bits are also 66 * encoded in fs/proc/array.c: get_task_state(). 67 * 68 * We have two separate sets of flags: task->state 69 * is about runnability, while task->exit_state are 70 * about the task exiting. Confusing, but this way 71 * modifying one set can't modify the other one by 72 * mistake. 73 */ 74 75 /* Used in tsk->state: */ 76 #define TASK_RUNNING 0x0000 77 #define TASK_INTERRUPTIBLE 0x0001 78 #define TASK_UNINTERRUPTIBLE 0x0002 79 #define __TASK_STOPPED 0x0004 80 #define __TASK_TRACED 0x0008 81 /* Used in tsk->exit_state: */ 82 #define EXIT_DEAD 0x0010 83 #define EXIT_ZOMBIE 0x0020 84 #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) 85 /* Used in tsk->state again: */ 86 #define TASK_PARKED 0x0040 87 #define TASK_DEAD 0x0080 88 #define TASK_WAKEKILL 0x0100 89 #define TASK_WAKING 0x0200 90 #define TASK_NOLOAD 0x0400 91 #define TASK_NEW 0x0800 92 #define TASK_STATE_MAX 0x1000 93 94 /* Convenience macros for the sake of set_current_state: */ 95 #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 96 #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 97 #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 98 99 #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) 100 101 /* Convenience macros for the sake of wake_up(): */ 102 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 103 104 /* get_task_state(): */ 105 #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 106 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 107 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ 108 TASK_PARKED) 109 110 #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 111 112 #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 113 114 #define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 115 116 #define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ 117 (task->flags & PF_FROZEN) == 0 && \ 118 (task->state & TASK_NOLOAD) == 0) 119 120 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP 121 122 /* 123 * Special states are those that do not use the normal wait-loop pattern. See 124 * the comment with set_special_state(). 125 */ 126 #define is_special_task_state(state) \ 127 ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) 128 129 #define __set_current_state(state_value) \ 130 do { \ 131 WARN_ON_ONCE(is_special_task_state(state_value));\ 132 current->task_state_change = _THIS_IP_; \ 133 current->state = (state_value); \ 134 } while (0) 135 136 #define set_current_state(state_value) \ 137 do { \ 138 WARN_ON_ONCE(is_special_task_state(state_value));\ 139 current->task_state_change = _THIS_IP_; \ 140 smp_store_mb(current->state, (state_value)); \ 141 } while (0) 142 143 #define set_special_state(state_value) \ 144 do { \ 145 unsigned long flags; /* may shadow */ \ 146 WARN_ON_ONCE(!is_special_task_state(state_value)); \ 147 raw_spin_lock_irqsave(¤t->pi_lock, flags); \ 148 current->task_state_change = _THIS_IP_; \ 149 current->state = (state_value); \ 150 raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ 151 } while (0) 152 #else 153 /* 154 * set_current_state() includes a barrier so that the write of current->state 155 * is correctly serialised wrt the caller's subsequent test of whether to 156 * actually sleep: 157 * 158 * for (;;) { 159 * set_current_state(TASK_UNINTERRUPTIBLE); 160 * if (!need_sleep) 161 * break; 162 * 163 * schedule(); 164 * } 165 * __set_current_state(TASK_RUNNING); 166 * 167 * If the caller does not need such serialisation (because, for instance, the 168 * condition test and condition change and wakeup are under the same lock) then 169 * use __set_current_state(). 170 * 171 * The above is typically ordered against the wakeup, which does: 172 * 173 * need_sleep = false; 174 * wake_up_state(p, TASK_UNINTERRUPTIBLE); 175 * 176 * where wake_up_state() executes a full memory barrier before accessing the 177 * task state. 178 * 179 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, 180 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a 181 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). 182 * 183 * However, with slightly different timing the wakeup TASK_RUNNING store can 184 * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not 185 * a problem either because that will result in one extra go around the loop 186 * and our @cond test will save the day. 187 * 188 * Also see the comments of try_to_wake_up(). 189 */ 190 #define __set_current_state(state_value) \ 191 current->state = (state_value) 192 193 #define set_current_state(state_value) \ 194 smp_store_mb(current->state, (state_value)) 195 196 /* 197 * set_special_state() should be used for those states when the blocking task 198 * can not use the regular condition based wait-loop. In that case we must 199 * serialize against wakeups such that any possible in-flight TASK_RUNNING stores 200 * will not collide with our state change. 201 */ 202 #define set_special_state(state_value) \ 203 do { \ 204 unsigned long flags; /* may shadow */ \ 205 raw_spin_lock_irqsave(¤t->pi_lock, flags); \ 206 current->state = (state_value); \ 207 raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ 208 } while (0) 209 210 #endif 211 212 /* Task command name length: */ 213 #define TASK_COMM_LEN 16 214 215 extern void scheduler_tick(void); 216 217 #define MAX_SCHEDULE_TIMEOUT LONG_MAX 218 219 extern long schedule_timeout(long timeout); 220 extern long schedule_timeout_interruptible(long timeout); 221 extern long schedule_timeout_killable(long timeout); 222 extern long schedule_timeout_uninterruptible(long timeout); 223 extern long schedule_timeout_idle(long timeout); 224 asmlinkage void schedule(void); 225 extern void schedule_preempt_disabled(void); 226 asmlinkage void preempt_schedule_irq(void); 227 228 extern int __must_check io_schedule_prepare(void); 229 extern void io_schedule_finish(int token); 230 extern long io_schedule_timeout(long timeout); 231 extern void io_schedule(void); 232 233 /** 234 * struct prev_cputime - snapshot of system and user cputime 235 * @utime: time spent in user mode 236 * @stime: time spent in system mode 237 * @lock: protects the above two fields 238 * 239 * Stores previous user/system time values such that we can guarantee 240 * monotonicity. 241 */ 242 struct prev_cputime { 243 #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 244 u64 utime; 245 u64 stime; 246 raw_spinlock_t lock; 247 #endif 248 }; 249 250 enum vtime_state { 251 /* Task is sleeping or running in a CPU with VTIME inactive: */ 252 VTIME_INACTIVE = 0, 253 /* Task is idle */ 254 VTIME_IDLE, 255 /* Task runs in kernelspace in a CPU with VTIME active: */ 256 VTIME_SYS, 257 /* Task runs in userspace in a CPU with VTIME active: */ 258 VTIME_USER, 259 /* Task runs as guests in a CPU with VTIME active: */ 260 VTIME_GUEST, 261 }; 262 263 struct vtime { 264 seqcount_t seqcount; 265 unsigned long long starttime; 266 enum vtime_state state; 267 unsigned int cpu; 268 u64 utime; 269 u64 stime; 270 u64 gtime; 271 }; 272 273 /* 274 * Utilization clamp constraints. 275 * @UCLAMP_MIN: Minimum utilization 276 * @UCLAMP_MAX: Maximum utilization 277 * @UCLAMP_CNT: Utilization clamp constraints count 278 */ 279 enum uclamp_id { 280 UCLAMP_MIN = 0, 281 UCLAMP_MAX, 282 UCLAMP_CNT 283 }; 284 285 #ifdef CONFIG_SMP 286 extern struct root_domain def_root_domain; 287 extern struct mutex sched_domains_mutex; 288 #endif 289 290 struct sched_info { 291 #ifdef CONFIG_SCHED_INFO 292 /* Cumulative counters: */ 293 294 /* # of times we have run on this CPU: */ 295 unsigned long pcount; 296 297 /* Time spent waiting on a runqueue: */ 298 unsigned long long run_delay; 299 300 /* Timestamps: */ 301 302 /* When did we last run on a CPU? */ 303 unsigned long long last_arrival; 304 305 /* When were we last queued to run? */ 306 unsigned long long last_queued; 307 308 #endif /* CONFIG_SCHED_INFO */ 309 }; 310 311 /* 312 * Integer metrics need fixed point arithmetic, e.g., sched/fair 313 * has a few: load, load_avg, util_avg, freq, and capacity. 314 * 315 * We define a basic fixed point arithmetic range, and then formalize 316 * all these metrics based on that basic range. 317 */ 318 # define SCHED_FIXEDPOINT_SHIFT 10 319 # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) 320 321 /* Increase resolution of cpu_capacity calculations */ 322 # define SCHED_CAPACITY_SHIFT SCHED_FIXEDPOINT_SHIFT 323 # define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT) 324 325 struct load_weight { 326 unsigned long weight; 327 u32 inv_weight; 328 }; 329 330 /** 331 * struct util_est - Estimation utilization of FAIR tasks 332 * @enqueued: instantaneous estimated utilization of a task/cpu 333 * @ewma: the Exponential Weighted Moving Average (EWMA) 334 * utilization of a task 335 * 336 * Support data structure to track an Exponential Weighted Moving Average 337 * (EWMA) of a FAIR task's utilization. New samples are added to the moving 338 * average each time a task completes an activation. Sample's weight is chosen 339 * so that the EWMA will be relatively insensitive to transient changes to the 340 * task's workload. 341 * 342 * The enqueued attribute has a slightly different meaning for tasks and cpus: 343 * - task: the task's util_avg at last task dequeue time 344 * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU 345 * Thus, the util_est.enqueued of a task represents the contribution on the 346 * estimated utilization of the CPU where that task is currently enqueued. 347 * 348 * Only for tasks we track a moving average of the past instantaneous 349 * estimated utilization. This allows to absorb sporadic drops in utilization 350 * of an otherwise almost periodic task. 351 */ 352 struct util_est { 353 unsigned int enqueued; 354 unsigned int ewma; 355 #define UTIL_EST_WEIGHT_SHIFT 2 356 } __attribute__((__aligned__(sizeof(u64)))); 357 358 /* 359 * The load/runnable/util_avg accumulates an infinite geometric series 360 * (see __update_load_avg_cfs_rq() in kernel/sched/pelt.c). 361 * 362 * [load_avg definition] 363 * 364 * load_avg = runnable% * scale_load_down(load) 365 * 366 * [runnable_avg definition] 367 * 368 * runnable_avg = runnable% * SCHED_CAPACITY_SCALE 369 * 370 * [util_avg definition] 371 * 372 * util_avg = running% * SCHED_CAPACITY_SCALE 373 * 374 * where runnable% is the time ratio that a sched_entity is runnable and 375 * running% the time ratio that a sched_entity is running. 376 * 377 * For cfs_rq, they are the aggregated values of all runnable and blocked 378 * sched_entities. 379 * 380 * The load/runnable/util_avg doesn't direcly factor frequency scaling and CPU 381 * capacity scaling. The scaling is done through the rq_clock_pelt that is used 382 * for computing those signals (see update_rq_clock_pelt()) 383 * 384 * N.B., the above ratios (runnable% and running%) themselves are in the 385 * range of [0, 1]. To do fixed point arithmetics, we therefore scale them 386 * to as large a range as necessary. This is for example reflected by 387 * util_avg's SCHED_CAPACITY_SCALE. 388 * 389 * [Overflow issue] 390 * 391 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities 392 * with the highest load (=88761), always runnable on a single cfs_rq, 393 * and should not overflow as the number already hits PID_MAX_LIMIT. 394 * 395 * For all other cases (including 32-bit kernels), struct load_weight's 396 * weight will overflow first before we do, because: 397 * 398 * Max(load_avg) <= Max(load.weight) 399 * 400 * Then it is the load_weight's responsibility to consider overflow 401 * issues. 402 */ 403 struct sched_avg { 404 u64 last_update_time; 405 u64 load_sum; 406 u64 runnable_sum; 407 u32 util_sum; 408 u32 period_contrib; 409 unsigned long load_avg; 410 unsigned long runnable_avg; 411 unsigned long util_avg; 412 struct util_est util_est; 413 } ____cacheline_aligned; 414 415 struct sched_statistics { 416 #ifdef CONFIG_SCHEDSTATS 417 u64 wait_start; 418 u64 wait_max; 419 u64 wait_count; 420 u64 wait_sum; 421 u64 iowait_count; 422 u64 iowait_sum; 423 424 u64 sleep_start; 425 u64 sleep_max; 426 s64 sum_sleep_runtime; 427 428 u64 block_start; 429 u64 block_max; 430 u64 exec_max; 431 u64 slice_max; 432 433 u64 nr_migrations_cold; 434 u64 nr_failed_migrations_affine; 435 u64 nr_failed_migrations_running; 436 u64 nr_failed_migrations_hot; 437 u64 nr_forced_migrations; 438 439 u64 nr_wakeups; 440 u64 nr_wakeups_sync; 441 u64 nr_wakeups_migrate; 442 u64 nr_wakeups_local; 443 u64 nr_wakeups_remote; 444 u64 nr_wakeups_affine; 445 u64 nr_wakeups_affine_attempts; 446 u64 nr_wakeups_passive; 447 u64 nr_wakeups_idle; 448 #endif 449 }; 450 451 struct sched_entity { 452 /* For load-balancing: */ 453 struct load_weight load; 454 struct rb_node run_node; 455 struct list_head group_node; 456 unsigned int on_rq; 457 458 u64 exec_start; 459 u64 sum_exec_runtime; 460 u64 vruntime; 461 u64 prev_sum_exec_runtime; 462 463 u64 nr_migrations; 464 465 struct sched_statistics statistics; 466 467 #ifdef CONFIG_FAIR_GROUP_SCHED 468 int depth; 469 struct sched_entity *parent; 470 /* rq on which this entity is (to be) queued: */ 471 struct cfs_rq *cfs_rq; 472 /* rq "owned" by this entity/group: */ 473 struct cfs_rq *my_q; 474 /* cached value of my_q->h_nr_running */ 475 unsigned long runnable_weight; 476 #endif 477 478 #ifdef CONFIG_SMP 479 /* 480 * Per entity load average tracking. 481 * 482 * Put into separate cache line so it does not 483 * collide with read-mostly values above. 484 */ 485 struct sched_avg avg; 486 #endif 487 }; 488 489 struct sched_rt_entity { 490 struct list_head run_list; 491 unsigned long timeout; 492 unsigned long watchdog_stamp; 493 unsigned int time_slice; 494 unsigned short on_rq; 495 unsigned short on_list; 496 497 struct sched_rt_entity *back; 498 #ifdef CONFIG_RT_GROUP_SCHED 499 struct sched_rt_entity *parent; 500 /* rq on which this entity is (to be) queued: */ 501 struct rt_rq *rt_rq; 502 /* rq "owned" by this entity/group: */ 503 struct rt_rq *my_q; 504 #endif 505 } __randomize_layout; 506 507 struct sched_dl_entity { 508 struct rb_node rb_node; 509 510 /* 511 * Original scheduling parameters. Copied here from sched_attr 512 * during sched_setattr(), they will remain the same until 513 * the next sched_setattr(). 514 */ 515 u64 dl_runtime; /* Maximum runtime for each instance */ 516 u64 dl_deadline; /* Relative deadline of each instance */ 517 u64 dl_period; /* Separation of two instances (period) */ 518 u64 dl_bw; /* dl_runtime / dl_period */ 519 u64 dl_density; /* dl_runtime / dl_deadline */ 520 521 /* 522 * Actual scheduling parameters. Initialized with the values above, 523 * they are continuously updated during task execution. Note that 524 * the remaining runtime could be < 0 in case we are in overrun. 525 */ 526 s64 runtime; /* Remaining runtime for this instance */ 527 u64 deadline; /* Absolute deadline for this instance */ 528 unsigned int flags; /* Specifying the scheduler behaviour */ 529 530 /* 531 * Some bool flags: 532 * 533 * @dl_throttled tells if we exhausted the runtime. If so, the 534 * task has to wait for a replenishment to be performed at the 535 * next firing of dl_timer. 536 * 537 * @dl_boosted tells if we are boosted due to DI. If so we are 538 * outside bandwidth enforcement mechanism (but only until we 539 * exit the critical section); 540 * 541 * @dl_yielded tells if task gave up the CPU before consuming 542 * all its available runtime during the last job. 543 * 544 * @dl_non_contending tells if the task is inactive while still 545 * contributing to the active utilization. In other words, it 546 * indicates if the inactive timer has been armed and its handler 547 * has not been executed yet. This flag is useful to avoid race 548 * conditions between the inactive timer handler and the wakeup 549 * code. 550 * 551 * @dl_overrun tells if the task asked to be informed about runtime 552 * overruns. 553 */ 554 unsigned int dl_throttled : 1; 555 unsigned int dl_boosted : 1; 556 unsigned int dl_yielded : 1; 557 unsigned int dl_non_contending : 1; 558 unsigned int dl_overrun : 1; 559 560 /* 561 * Bandwidth enforcement timer. Each -deadline task has its 562 * own bandwidth to be enforced, thus we need one timer per task. 563 */ 564 struct hrtimer dl_timer; 565 566 /* 567 * Inactive timer, responsible for decreasing the active utilization 568 * at the "0-lag time". When a -deadline task blocks, it contributes 569 * to GRUB's active utilization until the "0-lag time", hence a 570 * timer is needed to decrease the active utilization at the correct 571 * time. 572 */ 573 struct hrtimer inactive_timer; 574 }; 575 576 #ifdef CONFIG_UCLAMP_TASK 577 /* Number of utilization clamp buckets (shorter alias) */ 578 #define UCLAMP_BUCKETS CONFIG_UCLAMP_BUCKETS_COUNT 579 580 /* 581 * Utilization clamp for a scheduling entity 582 * @value: clamp value "assigned" to a se 583 * @bucket_id: bucket index corresponding to the "assigned" value 584 * @active: the se is currently refcounted in a rq's bucket 585 * @user_defined: the requested clamp value comes from user-space 586 * 587 * The bucket_id is the index of the clamp bucket matching the clamp value 588 * which is pre-computed and stored to avoid expensive integer divisions from 589 * the fast path. 590 * 591 * The active bit is set whenever a task has got an "effective" value assigned, 592 * which can be different from the clamp value "requested" from user-space. 593 * This allows to know a task is refcounted in the rq's bucket corresponding 594 * to the "effective" bucket_id. 595 * 596 * The user_defined bit is set whenever a task has got a task-specific clamp 597 * value requested from userspace, i.e. the system defaults apply to this task 598 * just as a restriction. This allows to relax default clamps when a less 599 * restrictive task-specific value has been requested, thus allowing to 600 * implement a "nice" semantic. For example, a task running with a 20% 601 * default boost can still drop its own boosting to 0%. 602 */ 603 struct uclamp_se { 604 unsigned int value : bits_per(SCHED_CAPACITY_SCALE); 605 unsigned int bucket_id : bits_per(UCLAMP_BUCKETS); 606 unsigned int active : 1; 607 unsigned int user_defined : 1; 608 }; 609 #endif /* CONFIG_UCLAMP_TASK */ 610 611 union rcu_special { 612 struct { 613 u8 blocked; 614 u8 need_qs; 615 u8 exp_hint; /* Hint for performance. */ 616 u8 need_mb; /* Readers need smp_mb(). */ 617 } b; /* Bits. */ 618 u32 s; /* Set of bits. */ 619 }; 620 621 enum perf_event_task_context { 622 perf_invalid_context = -1, 623 perf_hw_context = 0, 624 perf_sw_context, 625 perf_nr_task_contexts, 626 }; 627 628 struct wake_q_node { 629 struct wake_q_node *next; 630 }; 631 632 struct task_struct { 633 #ifdef CONFIG_THREAD_INFO_IN_TASK 634 /* 635 * For reasons of header soup (see current_thread_info()), this 636 * must be the first element of task_struct. 637 */ 638 struct thread_info thread_info; 639 #endif 640 /* -1 unrunnable, 0 runnable, >0 stopped: */ 641 volatile long state; 642 643 /* 644 * This begins the randomizable portion of task_struct. Only 645 * scheduling-critical items should be added above here. 646 */ 647 randomized_struct_fields_start 648 649 void *stack; 650 refcount_t usage; 651 /* Per task flags (PF_*), defined further below: */ 652 unsigned int flags; 653 unsigned int ptrace; 654 655 #ifdef CONFIG_SMP 656 struct llist_node wake_entry; 657 int on_cpu; 658 #ifdef CONFIG_THREAD_INFO_IN_TASK 659 /* Current CPU: */ 660 unsigned int cpu; 661 #endif 662 unsigned int wakee_flips; 663 unsigned long wakee_flip_decay_ts; 664 struct task_struct *last_wakee; 665 666 /* 667 * recent_used_cpu is initially set as the last CPU used by a task 668 * that wakes affine another task. Waker/wakee relationships can 669 * push tasks around a CPU where each wakeup moves to the next one. 670 * Tracking a recently used CPU allows a quick search for a recently 671 * used CPU that may be idle. 672 */ 673 int recent_used_cpu; 674 int wake_cpu; 675 #endif 676 int on_rq; 677 678 int prio; 679 int static_prio; 680 int normal_prio; 681 unsigned int rt_priority; 682 683 const struct sched_class *sched_class; 684 struct sched_entity se; 685 struct sched_rt_entity rt; 686 #ifdef CONFIG_CGROUP_SCHED 687 struct task_group *sched_task_group; 688 #endif 689 struct sched_dl_entity dl; 690 691 #ifdef CONFIG_UCLAMP_TASK 692 /* Clamp values requested for a scheduling entity */ 693 struct uclamp_se uclamp_req[UCLAMP_CNT]; 694 /* Effective clamp values used for a scheduling entity */ 695 struct uclamp_se uclamp[UCLAMP_CNT]; 696 #endif 697 698 #ifdef CONFIG_PREEMPT_NOTIFIERS 699 /* List of struct preempt_notifier: */ 700 struct hlist_head preempt_notifiers; 701 #endif 702 703 #ifdef CONFIG_BLK_DEV_IO_TRACE 704 unsigned int btrace_seq; 705 #endif 706 707 unsigned int policy; 708 int nr_cpus_allowed; 709 const cpumask_t *cpus_ptr; 710 cpumask_t cpus_mask; 711 712 #ifdef CONFIG_PREEMPT_RCU 713 int rcu_read_lock_nesting; 714 union rcu_special rcu_read_unlock_special; 715 struct list_head rcu_node_entry; 716 struct rcu_node *rcu_blocked_node; 717 #endif /* #ifdef CONFIG_PREEMPT_RCU */ 718 719 #ifdef CONFIG_TASKS_RCU 720 unsigned long rcu_tasks_nvcsw; 721 u8 rcu_tasks_holdout; 722 u8 rcu_tasks_idx; 723 int rcu_tasks_idle_cpu; 724 struct list_head rcu_tasks_holdout_list; 725 #endif /* #ifdef CONFIG_TASKS_RCU */ 726 727 #ifdef CONFIG_TASKS_TRACE_RCU 728 int trc_reader_nesting; 729 int trc_ipi_to_cpu; 730 union rcu_special trc_reader_special; 731 bool trc_reader_checked; 732 struct list_head trc_holdout_list; 733 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ 734 735 struct sched_info sched_info; 736 737 struct list_head tasks; 738 #ifdef CONFIG_SMP 739 struct plist_node pushable_tasks; 740 struct rb_node pushable_dl_tasks; 741 #endif 742 743 struct mm_struct *mm; 744 struct mm_struct *active_mm; 745 746 /* Per-thread vma caching: */ 747 struct vmacache vmacache; 748 749 #ifdef SPLIT_RSS_COUNTING 750 struct task_rss_stat rss_stat; 751 #endif 752 int exit_state; 753 int exit_code; 754 int exit_signal; 755 /* The signal sent when the parent dies: */ 756 int pdeath_signal; 757 /* JOBCTL_*, siglock protected: */ 758 unsigned long jobctl; 759 760 /* Used for emulating ABI behavior of previous Linux versions: */ 761 unsigned int personality; 762 763 /* Scheduler bits, serialized by scheduler locks: */ 764 unsigned sched_reset_on_fork:1; 765 unsigned sched_contributes_to_load:1; 766 unsigned sched_migrated:1; 767 unsigned sched_remote_wakeup:1; 768 #ifdef CONFIG_PSI 769 unsigned sched_psi_wake_requeue:1; 770 #endif 771 772 /* Force alignment to the next boundary: */ 773 unsigned :0; 774 775 /* Unserialized, strictly 'current' */ 776 777 /* Bit to tell LSMs we're in execve(): */ 778 unsigned in_execve:1; 779 unsigned in_iowait:1; 780 #ifndef TIF_RESTORE_SIGMASK 781 unsigned restore_sigmask:1; 782 #endif 783 #ifdef CONFIG_MEMCG 784 unsigned in_user_fault:1; 785 #endif 786 #ifdef CONFIG_COMPAT_BRK 787 unsigned brk_randomized:1; 788 #endif 789 #ifdef CONFIG_CGROUPS 790 /* disallow userland-initiated cgroup migration */ 791 unsigned no_cgroup_migration:1; 792 /* task is frozen/stopped (used by the cgroup freezer) */ 793 unsigned frozen:1; 794 #endif 795 #ifdef CONFIG_BLK_CGROUP 796 unsigned use_memdelay:1; 797 #endif 798 #ifdef CONFIG_PSI 799 /* Stalled due to lack of memory */ 800 unsigned in_memstall:1; 801 #endif 802 803 unsigned long atomic_flags; /* Flags requiring atomic access. */ 804 805 struct restart_block restart_block; 806 807 pid_t pid; 808 pid_t tgid; 809 810 #ifdef CONFIG_STACKPROTECTOR 811 /* Canary value for the -fstack-protector GCC feature: */ 812 unsigned long stack_canary; 813 #endif 814 /* 815 * Pointers to the (original) parent process, youngest child, younger sibling, 816 * older sibling, respectively. (p->father can be replaced with 817 * p->real_parent->pid) 818 */ 819 820 /* Real parent process: */ 821 struct task_struct __rcu *real_parent; 822 823 /* Recipient of SIGCHLD, wait4() reports: */ 824 struct task_struct __rcu *parent; 825 826 /* 827 * Children/sibling form the list of natural children: 828 */ 829 struct list_head children; 830 struct list_head sibling; 831 struct task_struct *group_leader; 832 833 /* 834 * 'ptraced' is the list of tasks this task is using ptrace() on. 835 * 836 * This includes both natural children and PTRACE_ATTACH targets. 837 * 'ptrace_entry' is this task's link on the p->parent->ptraced list. 838 */ 839 struct list_head ptraced; 840 struct list_head ptrace_entry; 841 842 /* PID/PID hash table linkage. */ 843 struct pid *thread_pid; 844 struct hlist_node pid_links[PIDTYPE_MAX]; 845 struct list_head thread_group; 846 struct list_head thread_node; 847 848 struct completion *vfork_done; 849 850 /* CLONE_CHILD_SETTID: */ 851 int __user *set_child_tid; 852 853 /* CLONE_CHILD_CLEARTID: */ 854 int __user *clear_child_tid; 855 856 u64 utime; 857 u64 stime; 858 #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME 859 u64 utimescaled; 860 u64 stimescaled; 861 #endif 862 u64 gtime; 863 struct prev_cputime prev_cputime; 864 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 865 struct vtime vtime; 866 #endif 867 868 #ifdef CONFIG_NO_HZ_FULL 869 atomic_t tick_dep_mask; 870 #endif 871 /* Context switch counts: */ 872 unsigned long nvcsw; 873 unsigned long nivcsw; 874 875 /* Monotonic time in nsecs: */ 876 u64 start_time; 877 878 /* Boot based time in nsecs: */ 879 u64 start_boottime; 880 881 /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ 882 unsigned long min_flt; 883 unsigned long maj_flt; 884 885 /* Empty if CONFIG_POSIX_CPUTIMERS=n */ 886 struct posix_cputimers posix_cputimers; 887 888 /* Process credentials: */ 889 890 /* Tracer's credentials at attach: */ 891 const struct cred __rcu *ptracer_cred; 892 893 /* Objective and real subjective task credentials (COW): */ 894 const struct cred __rcu *real_cred; 895 896 /* Effective (overridable) subjective task credentials (COW): */ 897 const struct cred __rcu *cred; 898 899 #ifdef CONFIG_KEYS 900 /* Cached requested key. */ 901 struct key *cached_requested_key; 902 #endif 903 904 /* 905 * executable name, excluding path. 906 * 907 * - normally initialized setup_new_exec() 908 * - access it with [gs]et_task_comm() 909 * - lock it with task_lock() 910 */ 911 char comm[TASK_COMM_LEN]; 912 913 struct nameidata *nameidata; 914 915 #ifdef CONFIG_SYSVIPC 916 struct sysv_sem sysvsem; 917 struct sysv_shm sysvshm; 918 #endif 919 #ifdef CONFIG_DETECT_HUNG_TASK 920 unsigned long last_switch_count; 921 unsigned long last_switch_time; 922 #endif 923 /* Filesystem information: */ 924 struct fs_struct *fs; 925 926 /* Open file information: */ 927 struct files_struct *files; 928 929 /* Namespaces: */ 930 struct nsproxy *nsproxy; 931 932 /* Signal handlers: */ 933 struct signal_struct *signal; 934 struct sighand_struct __rcu *sighand; 935 sigset_t blocked; 936 sigset_t real_blocked; 937 /* Restored if set_restore_sigmask() was used: */ 938 sigset_t saved_sigmask; 939 struct sigpending pending; 940 unsigned long sas_ss_sp; 941 size_t sas_ss_size; 942 unsigned int sas_ss_flags; 943 944 struct callback_head *task_works; 945 946 #ifdef CONFIG_AUDIT 947 #ifdef CONFIG_AUDITSYSCALL 948 struct audit_context *audit_context; 949 #endif 950 kuid_t loginuid; 951 unsigned int sessionid; 952 #endif 953 struct seccomp seccomp; 954 955 /* Thread group tracking: */ 956 u64 parent_exec_id; 957 u64 self_exec_id; 958 959 /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ 960 spinlock_t alloc_lock; 961 962 /* Protection of the PI data structures: */ 963 raw_spinlock_t pi_lock; 964 965 struct wake_q_node wake_q; 966 967 #ifdef CONFIG_RT_MUTEXES 968 /* PI waiters blocked on a rt_mutex held by this task: */ 969 struct rb_root_cached pi_waiters; 970 /* Updated under owner's pi_lock and rq lock */ 971 struct task_struct *pi_top_task; 972 /* Deadlock detection and priority inheritance handling: */ 973 struct rt_mutex_waiter *pi_blocked_on; 974 #endif 975 976 #ifdef CONFIG_DEBUG_MUTEXES 977 /* Mutex deadlock detection: */ 978 struct mutex_waiter *blocked_on; 979 #endif 980 981 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP 982 int non_block_count; 983 #endif 984 985 #ifdef CONFIG_TRACE_IRQFLAGS 986 unsigned int irq_events; 987 unsigned int hardirq_threaded; 988 unsigned long hardirq_enable_ip; 989 unsigned long hardirq_disable_ip; 990 unsigned int hardirq_enable_event; 991 unsigned int hardirq_disable_event; 992 int hardirqs_enabled; 993 int hardirq_context; 994 unsigned long softirq_disable_ip; 995 unsigned long softirq_enable_ip; 996 unsigned int softirq_disable_event; 997 unsigned int softirq_enable_event; 998 int softirqs_enabled; 999 int softirq_context; 1000 int irq_config; 1001 #endif 1002 1003 #ifdef CONFIG_LOCKDEP 1004 # define MAX_LOCK_DEPTH 48UL 1005 u64 curr_chain_key; 1006 int lockdep_depth; 1007 unsigned int lockdep_recursion; 1008 struct held_lock held_locks[MAX_LOCK_DEPTH]; 1009 #endif 1010 1011 #ifdef CONFIG_UBSAN 1012 unsigned int in_ubsan; 1013 #endif 1014 1015 /* Journalling filesystem info: */ 1016 void *journal_info; 1017 1018 /* Stacked block device info: */ 1019 struct bio_list *bio_list; 1020 1021 #ifdef CONFIG_BLOCK 1022 /* Stack plugging: */ 1023 struct blk_plug *plug; 1024 #endif 1025 1026 /* VM state: */ 1027 struct reclaim_state *reclaim_state; 1028 1029 struct backing_dev_info *backing_dev_info; 1030 1031 struct io_context *io_context; 1032 1033 #ifdef CONFIG_COMPACTION 1034 struct capture_control *capture_control; 1035 #endif 1036 /* Ptrace state: */ 1037 unsigned long ptrace_message; 1038 kernel_siginfo_t *last_siginfo; 1039 1040 struct task_io_accounting ioac; 1041 #ifdef CONFIG_PSI 1042 /* Pressure stall state */ 1043 unsigned int psi_flags; 1044 #endif 1045 #ifdef CONFIG_TASK_XACCT 1046 /* Accumulated RSS usage: */ 1047 u64 acct_rss_mem1; 1048 /* Accumulated virtual memory usage: */ 1049 u64 acct_vm_mem1; 1050 /* stime + utime since last update: */ 1051 u64 acct_timexpd; 1052 #endif 1053 #ifdef CONFIG_CPUSETS 1054 /* Protected by ->alloc_lock: */ 1055 nodemask_t mems_allowed; 1056 /* Seqence number to catch updates: */ 1057 seqcount_t mems_allowed_seq; 1058 int cpuset_mem_spread_rotor; 1059 int cpuset_slab_spread_rotor; 1060 #endif 1061 #ifdef CONFIG_CGROUPS 1062 /* Control Group info protected by css_set_lock: */ 1063 struct css_set __rcu *cgroups; 1064 /* cg_list protected by css_set_lock and tsk->alloc_lock: */ 1065 struct list_head cg_list; 1066 #endif 1067 #ifdef CONFIG_X86_CPU_RESCTRL 1068 u32 closid; 1069 u32 rmid; 1070 #endif 1071 #ifdef CONFIG_FUTEX 1072 struct robust_list_head __user *robust_list; 1073 #ifdef CONFIG_COMPAT 1074 struct compat_robust_list_head __user *compat_robust_list; 1075 #endif 1076 struct list_head pi_state_list; 1077 struct futex_pi_state *pi_state_cache; 1078 struct mutex futex_exit_mutex; 1079 unsigned int futex_state; 1080 #endif 1081 #ifdef CONFIG_PERF_EVENTS 1082 struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; 1083 struct mutex perf_event_mutex; 1084 struct list_head perf_event_list; 1085 #endif 1086 #ifdef CONFIG_DEBUG_PREEMPT 1087 unsigned long preempt_disable_ip; 1088 #endif 1089 #ifdef CONFIG_NUMA 1090 /* Protected by alloc_lock: */ 1091 struct mempolicy *mempolicy; 1092 short il_prev; 1093 short pref_node_fork; 1094 #endif 1095 #ifdef CONFIG_NUMA_BALANCING 1096 int numa_scan_seq; 1097 unsigned int numa_scan_period; 1098 unsigned int numa_scan_period_max; 1099 int numa_preferred_nid; 1100 unsigned long numa_migrate_retry; 1101 /* Migration stamp: */ 1102 u64 node_stamp; 1103 u64 last_task_numa_placement; 1104 u64 last_sum_exec_runtime; 1105 struct callback_head numa_work; 1106 1107 /* 1108 * This pointer is only modified for current in syscall and 1109 * pagefault context (and for tasks being destroyed), so it can be read 1110 * from any of the following contexts: 1111 * - RCU read-side critical section 1112 * - current->numa_group from everywhere 1113 * - task's runqueue locked, task not running 1114 */ 1115 struct numa_group __rcu *numa_group; 1116 1117 /* 1118 * numa_faults is an array split into four regions: 1119 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer 1120 * in this precise order. 1121 * 1122 * faults_memory: Exponential decaying average of faults on a per-node 1123 * basis. Scheduling placement decisions are made based on these 1124 * counts. The values remain static for the duration of a PTE scan. 1125 * faults_cpu: Track the nodes the process was running on when a NUMA 1126 * hinting fault was incurred. 1127 * faults_memory_buffer and faults_cpu_buffer: Record faults per node 1128 * during the current scan window. When the scan completes, the counts 1129 * in faults_memory and faults_cpu decay and these values are copied. 1130 */ 1131 unsigned long *numa_faults; 1132 unsigned long total_numa_faults; 1133 1134 /* 1135 * numa_faults_locality tracks if faults recorded during the last 1136 * scan window were remote/local or failed to migrate. The task scan 1137 * period is adapted based on the locality of the faults with different 1138 * weights depending on whether they were shared or private faults 1139 */ 1140 unsigned long numa_faults_locality[3]; 1141 1142 unsigned long numa_pages_migrated; 1143 #endif /* CONFIG_NUMA_BALANCING */ 1144 1145 #ifdef CONFIG_RSEQ 1146 struct rseq __user *rseq; 1147 u32 rseq_sig; 1148 /* 1149 * RmW on rseq_event_mask must be performed atomically 1150 * with respect to preemption. 1151 */ 1152 unsigned long rseq_event_mask; 1153 #endif 1154 1155 struct tlbflush_unmap_batch tlb_ubc; 1156 1157 union { 1158 refcount_t rcu_users; 1159 struct rcu_head rcu; 1160 }; 1161 1162 /* Cache last used pipe for splice(): */ 1163 struct pipe_inode_info *splice_pipe; 1164 1165 struct page_frag task_frag; 1166 1167 #ifdef CONFIG_TASK_DELAY_ACCT 1168 struct task_delay_info *delays; 1169 #endif 1170 1171 #ifdef CONFIG_FAULT_INJECTION 1172 int make_it_fail; 1173 unsigned int fail_nth; 1174 #endif 1175 /* 1176 * When (nr_dirtied >= nr_dirtied_pause), it's time to call 1177 * balance_dirty_pages() for a dirty throttling pause: 1178 */ 1179 int nr_dirtied; 1180 int nr_dirtied_pause; 1181 /* Start of a write-and-pause period: */ 1182 unsigned long dirty_paused_when; 1183 1184 #ifdef CONFIG_LATENCYTOP 1185 int latency_record_count; 1186 struct latency_record latency_record[LT_SAVECOUNT]; 1187 #endif 1188 /* 1189 * Time slack values; these are used to round up poll() and 1190 * select() etc timeout values. These are in nanoseconds. 1191 */ 1192 u64 timer_slack_ns; 1193 u64 default_timer_slack_ns; 1194 1195 #ifdef CONFIG_KASAN 1196 unsigned int kasan_depth; 1197 #endif 1198 1199 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1200 /* Index of current stored address in ret_stack: */ 1201 int curr_ret_stack; 1202 int curr_ret_depth; 1203 1204 /* Stack of return addresses for return function tracing: */ 1205 struct ftrace_ret_stack *ret_stack; 1206 1207 /* Timestamp for last schedule: */ 1208 unsigned long long ftrace_timestamp; 1209 1210 /* 1211 * Number of functions that haven't been traced 1212 * because of depth overrun: 1213 */ 1214 atomic_t trace_overrun; 1215 1216 /* Pause tracing: */ 1217 atomic_t tracing_graph_pause; 1218 #endif 1219 1220 #ifdef CONFIG_TRACING 1221 /* State flags for use by tracers: */ 1222 unsigned long trace; 1223 1224 /* Bitmask and counter of trace recursion: */ 1225 unsigned long trace_recursion; 1226 #endif /* CONFIG_TRACING */ 1227 1228 #ifdef CONFIG_KCOV 1229 /* See kernel/kcov.c for more details. */ 1230 1231 /* Coverage collection mode enabled for this task (0 if disabled): */ 1232 unsigned int kcov_mode; 1233 1234 /* Size of the kcov_area: */ 1235 unsigned int kcov_size; 1236 1237 /* Buffer for coverage collection: */ 1238 void *kcov_area; 1239 1240 /* KCOV descriptor wired with this task or NULL: */ 1241 struct kcov *kcov; 1242 1243 /* KCOV common handle for remote coverage collection: */ 1244 u64 kcov_handle; 1245 1246 /* KCOV sequence number: */ 1247 int kcov_sequence; 1248 #endif 1249 1250 #ifdef CONFIG_MEMCG 1251 struct mem_cgroup *memcg_in_oom; 1252 gfp_t memcg_oom_gfp_mask; 1253 int memcg_oom_order; 1254 1255 /* Number of pages to reclaim on returning to userland: */ 1256 unsigned int memcg_nr_pages_over_high; 1257 1258 /* Used by memcontrol for targeted memcg charge: */ 1259 struct mem_cgroup *active_memcg; 1260 #endif 1261 1262 #ifdef CONFIG_BLK_CGROUP 1263 struct request_queue *throttle_queue; 1264 #endif 1265 1266 #ifdef CONFIG_UPROBES 1267 struct uprobe_task *utask; 1268 #endif 1269 #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) 1270 unsigned int sequential_io; 1271 unsigned int sequential_io_avg; 1272 #endif 1273 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP 1274 unsigned long task_state_change; 1275 #endif 1276 int pagefault_disabled; 1277 #ifdef CONFIG_MMU 1278 struct task_struct *oom_reaper_list; 1279 #endif 1280 #ifdef CONFIG_VMAP_STACK 1281 struct vm_struct *stack_vm_area; 1282 #endif 1283 #ifdef CONFIG_THREAD_INFO_IN_TASK 1284 /* A live task holds one reference: */ 1285 refcount_t stack_refcount; 1286 #endif 1287 #ifdef CONFIG_LIVEPATCH 1288 int patch_state; 1289 #endif 1290 #ifdef CONFIG_SECURITY 1291 /* Used by LSM modules for access restriction: */ 1292 void *security; 1293 #endif 1294 1295 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK 1296 unsigned long lowest_stack; 1297 unsigned long prev_lowest_stack; 1298 #endif 1299 1300 #ifdef CONFIG_X86_MCE 1301 u64 mce_addr; 1302 u64 mce_status; 1303 struct callback_head mce_kill_me; 1304 #endif 1305 1306 /* 1307 * New fields for task_struct should be added above here, so that 1308 * they are included in the randomized portion of task_struct. 1309 */ 1310 randomized_struct_fields_end 1311 1312 /* CPU-specific state of this task: */ 1313 struct thread_struct thread; 1314 1315 /* 1316 * WARNING: on x86, 'thread_struct' contains a variable-sized 1317 * structure. It *MUST* be at the end of 'task_struct'. 1318 * 1319 * Do not put anything below here! 1320 */ 1321 }; 1322 1323 static inline struct pid *task_pid(struct task_struct *task) 1324 { 1325 return task->thread_pid; 1326 } 1327 1328 /* 1329 * the helpers to get the task's different pids as they are seen 1330 * from various namespaces 1331 * 1332 * task_xid_nr() : global id, i.e. the id seen from the init namespace; 1333 * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 1334 * current. 1335 * task_xid_nr_ns() : id seen from the ns specified; 1336 * 1337 * see also pid_nr() etc in include/linux/pid.h 1338 */ 1339 pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); 1340 1341 static inline pid_t task_pid_nr(struct task_struct *tsk) 1342 { 1343 return tsk->pid; 1344 } 1345 1346 static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) 1347 { 1348 return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); 1349 } 1350 1351 static inline pid_t task_pid_vnr(struct task_struct *tsk) 1352 { 1353 return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); 1354 } 1355 1356 1357 static inline pid_t task_tgid_nr(struct task_struct *tsk) 1358 { 1359 return tsk->tgid; 1360 } 1361 1362 /** 1363 * pid_alive - check that a task structure is not stale 1364 * @p: Task structure to be checked. 1365 * 1366 * Test if a process is not yet dead (at most zombie state) 1367 * If pid_alive fails, then pointers within the task structure 1368 * can be stale and must not be dereferenced. 1369 * 1370 * Return: 1 if the process is alive. 0 otherwise. 1371 */ 1372 static inline int pid_alive(const struct task_struct *p) 1373 { 1374 return p->thread_pid != NULL; 1375 } 1376 1377 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) 1378 { 1379 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); 1380 } 1381 1382 static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 1383 { 1384 return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); 1385 } 1386 1387 1388 static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) 1389 { 1390 return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); 1391 } 1392 1393 static inline pid_t task_session_vnr(struct task_struct *tsk) 1394 { 1395 return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); 1396 } 1397 1398 static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) 1399 { 1400 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); 1401 } 1402 1403 static inline pid_t task_tgid_vnr(struct task_struct *tsk) 1404 { 1405 return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); 1406 } 1407 1408 static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) 1409 { 1410 pid_t pid = 0; 1411 1412 rcu_read_lock(); 1413 if (pid_alive(tsk)) 1414 pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); 1415 rcu_read_unlock(); 1416 1417 return pid; 1418 } 1419 1420 static inline pid_t task_ppid_nr(const struct task_struct *tsk) 1421 { 1422 return task_ppid_nr_ns(tsk, &init_pid_ns); 1423 } 1424 1425 /* Obsolete, do not use: */ 1426 static inline pid_t task_pgrp_nr(struct task_struct *tsk) 1427 { 1428 return task_pgrp_nr_ns(tsk, &init_pid_ns); 1429 } 1430 1431 #define TASK_REPORT_IDLE (TASK_REPORT + 1) 1432 #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) 1433 1434 static inline unsigned int task_state_index(struct task_struct *tsk) 1435 { 1436 unsigned int tsk_state = READ_ONCE(tsk->state); 1437 unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT; 1438 1439 BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); 1440 1441 if (tsk_state == TASK_IDLE) 1442 state = TASK_REPORT_IDLE; 1443 1444 return fls(state); 1445 } 1446 1447 static inline char task_index_to_char(unsigned int state) 1448 { 1449 static const char state_char[] = "RSDTtXZPI"; 1450 1451 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); 1452 1453 return state_char[state]; 1454 } 1455 1456 static inline char task_state_to_char(struct task_struct *tsk) 1457 { 1458 return task_index_to_char(task_state_index(tsk)); 1459 } 1460 1461 /** 1462 * is_global_init - check if a task structure is init. Since init 1463 * is free to have sub-threads we need to check tgid. 1464 * @tsk: Task structure to be checked. 1465 * 1466 * Check if a task structure is the first user space task the kernel created. 1467 * 1468 * Return: 1 if the task structure is init. 0 otherwise. 1469 */ 1470 static inline int is_global_init(struct task_struct *tsk) 1471 { 1472 return task_tgid_nr(tsk) == 1; 1473 } 1474 1475 extern struct pid *cad_pid; 1476 1477 /* 1478 * Per process flags 1479 */ 1480 #define PF_IDLE 0x00000002 /* I am an IDLE thread */ 1481 #define PF_EXITING 0x00000004 /* Getting shut down */ 1482 #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 1483 #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ 1484 #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ 1485 #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ 1486 #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ 1487 #define PF_DUMPCORE 0x00000200 /* Dumped core */ 1488 #define PF_SIGNALED 0x00000400 /* Killed by a signal */ 1489 #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 1490 #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ 1491 #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ 1492 #define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */ 1493 #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ 1494 #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ 1495 #define PF_KSWAPD 0x00020000 /* I am kswapd */ 1496 #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ 1497 #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ 1498 #define PF_LOCAL_THROTTLE 0x00100000 /* Throttle writes only against the bdi I write to, 1499 * I am cleaning dirty pages from some other bdi. */ 1500 #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1501 #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ 1502 #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1503 #define PF_UMH 0x02000000 /* I'm an Usermodehelper process */ 1504 #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_mask */ 1505 #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ 1506 #define PF_MEMALLOC_NOCMA 0x10000000 /* All allocation request will have _GFP_MOVABLE cleared */ 1507 #define PF_IO_WORKER 0x20000000 /* Task is an IO worker */ 1508 #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ 1509 #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ 1510 1511 /* 1512 * Only the _current_ task can read/write to tsk->flags, but other 1513 * tasks can access tsk->flags in readonly mode for example 1514 * with tsk_used_math (like during threaded core dumping). 1515 * There is however an exception to this rule during ptrace 1516 * or during fork: the ptracer task is allowed to write to the 1517 * child->flags of its traced child (same goes for fork, the parent 1518 * can write to the child->flags), because we're guaranteed the 1519 * child is not running and in turn not changing child->flags 1520 * at the same time the parent does it. 1521 */ 1522 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 1523 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 1524 #define clear_used_math() clear_stopped_child_used_math(current) 1525 #define set_used_math() set_stopped_child_used_math(current) 1526 1527 #define conditional_stopped_child_used_math(condition, child) \ 1528 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 1529 1530 #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) 1531 1532 #define copy_to_stopped_child_used_math(child) \ 1533 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 1534 1535 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 1536 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 1537 #define used_math() tsk_used_math(current) 1538 1539 static inline bool is_percpu_thread(void) 1540 { 1541 #ifdef CONFIG_SMP 1542 return (current->flags & PF_NO_SETAFFINITY) && 1543 (current->nr_cpus_allowed == 1); 1544 #else 1545 return true; 1546 #endif 1547 } 1548 1549 /* Per-process atomic flags. */ 1550 #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ 1551 #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ 1552 #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ 1553 #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ 1554 #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ 1555 #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ 1556 #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ 1557 #define PFA_SPEC_SSB_NOEXEC 7 /* Speculative Store Bypass clear on execve() */ 1558 1559 #define TASK_PFA_TEST(name, func) \ 1560 static inline bool task_##func(struct task_struct *p) \ 1561 { return test_bit(PFA_##name, &p->atomic_flags); } 1562 1563 #define TASK_PFA_SET(name, func) \ 1564 static inline void task_set_##func(struct task_struct *p) \ 1565 { set_bit(PFA_##name, &p->atomic_flags); } 1566 1567 #define TASK_PFA_CLEAR(name, func) \ 1568 static inline void task_clear_##func(struct task_struct *p) \ 1569 { clear_bit(PFA_##name, &p->atomic_flags); } 1570 1571 TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) 1572 TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) 1573 1574 TASK_PFA_TEST(SPREAD_PAGE, spread_page) 1575 TASK_PFA_SET(SPREAD_PAGE, spread_page) 1576 TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) 1577 1578 TASK_PFA_TEST(SPREAD_SLAB, spread_slab) 1579 TASK_PFA_SET(SPREAD_SLAB, spread_slab) 1580 TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) 1581 1582 TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) 1583 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) 1584 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) 1585 1586 TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec) 1587 TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec) 1588 TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec) 1589 1590 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) 1591 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) 1592 1593 TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) 1594 TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) 1595 TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) 1596 1597 TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) 1598 TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) 1599 1600 static inline void 1601 current_restore_flags(unsigned long orig_flags, unsigned long flags) 1602 { 1603 current->flags &= ~flags; 1604 current->flags |= orig_flags & flags; 1605 } 1606 1607 extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); 1608 extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); 1609 #ifdef CONFIG_SMP 1610 extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); 1611 extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); 1612 #else 1613 static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) 1614 { 1615 } 1616 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) 1617 { 1618 if (!cpumask_test_cpu(0, new_mask)) 1619 return -EINVAL; 1620 return 0; 1621 } 1622 #endif 1623 1624 extern int yield_to(struct task_struct *p, bool preempt); 1625 extern void set_user_nice(struct task_struct *p, long nice); 1626 extern int task_prio(const struct task_struct *p); 1627 1628 /** 1629 * task_nice - return the nice value of a given task. 1630 * @p: the task in question. 1631 * 1632 * Return: The nice value [ -20 ... 0 ... 19 ]. 1633 */ 1634 static inline int task_nice(const struct task_struct *p) 1635 { 1636 return PRIO_TO_NICE((p)->static_prio); 1637 } 1638 1639 extern int can_nice(const struct task_struct *p, const int nice); 1640 extern int task_curr(const struct task_struct *p); 1641 extern int idle_cpu(int cpu); 1642 extern int available_idle_cpu(int cpu); 1643 extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); 1644 extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); 1645 extern int sched_setattr(struct task_struct *, const struct sched_attr *); 1646 extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); 1647 extern struct task_struct *idle_task(int cpu); 1648 1649 /** 1650 * is_idle_task - is the specified task an idle task? 1651 * @p: the task in question. 1652 * 1653 * Return: 1 if @p is an idle task. 0 otherwise. 1654 */ 1655 static inline bool is_idle_task(const struct task_struct *p) 1656 { 1657 return !!(p->flags & PF_IDLE); 1658 } 1659 1660 extern struct task_struct *curr_task(int cpu); 1661 extern void ia64_set_curr_task(int cpu, struct task_struct *p); 1662 1663 void yield(void); 1664 1665 union thread_union { 1666 #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK 1667 struct task_struct task; 1668 #endif 1669 #ifndef CONFIG_THREAD_INFO_IN_TASK 1670 struct thread_info thread_info; 1671 #endif 1672 unsigned long stack[THREAD_SIZE/sizeof(long)]; 1673 }; 1674 1675 #ifndef CONFIG_THREAD_INFO_IN_TASK 1676 extern struct thread_info init_thread_info; 1677 #endif 1678 1679 extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; 1680 1681 #ifdef CONFIG_THREAD_INFO_IN_TASK 1682 static inline struct thread_info *task_thread_info(struct task_struct *task) 1683 { 1684 return &task->thread_info; 1685 } 1686 #elif !defined(__HAVE_THREAD_FUNCTIONS) 1687 # define task_thread_info(task) ((struct thread_info *)(task)->stack) 1688 #endif 1689 1690 /* 1691 * find a task by one of its numerical ids 1692 * 1693 * find_task_by_pid_ns(): 1694 * finds a task by its pid in the specified namespace 1695 * find_task_by_vpid(): 1696 * finds a task by its virtual pid 1697 * 1698 * see also find_vpid() etc in include/linux/pid.h 1699 */ 1700 1701 extern struct task_struct *find_task_by_vpid(pid_t nr); 1702 extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); 1703 1704 /* 1705 * find a task by its virtual pid and get the task struct 1706 */ 1707 extern struct task_struct *find_get_task_by_vpid(pid_t nr); 1708 1709 extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1710 extern int wake_up_process(struct task_struct *tsk); 1711 extern void wake_up_new_task(struct task_struct *tsk); 1712 1713 #ifdef CONFIG_SMP 1714 extern void kick_process(struct task_struct *tsk); 1715 #else 1716 static inline void kick_process(struct task_struct *tsk) { } 1717 #endif 1718 1719 extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); 1720 1721 static inline void set_task_comm(struct task_struct *tsk, const char *from) 1722 { 1723 __set_task_comm(tsk, from, false); 1724 } 1725 1726 extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); 1727 #define get_task_comm(buf, tsk) ({ \ 1728 BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ 1729 __get_task_comm(buf, sizeof(buf), tsk); \ 1730 }) 1731 1732 #ifdef CONFIG_SMP 1733 void scheduler_ipi(void); 1734 extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 1735 #else 1736 static inline void scheduler_ipi(void) { } 1737 static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state) 1738 { 1739 return 1; 1740 } 1741 #endif 1742 1743 /* 1744 * Set thread flags in other task's structures. 1745 * See asm/thread_info.h for TIF_xxxx flags available: 1746 */ 1747 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 1748 { 1749 set_ti_thread_flag(task_thread_info(tsk), flag); 1750 } 1751 1752 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1753 { 1754 clear_ti_thread_flag(task_thread_info(tsk), flag); 1755 } 1756 1757 static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, 1758 bool value) 1759 { 1760 update_ti_thread_flag(task_thread_info(tsk), flag, value); 1761 } 1762 1763 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 1764 { 1765 return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 1766 } 1767 1768 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 1769 { 1770 return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 1771 } 1772 1773 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 1774 { 1775 return test_ti_thread_flag(task_thread_info(tsk), flag); 1776 } 1777 1778 static inline void set_tsk_need_resched(struct task_struct *tsk) 1779 { 1780 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1781 } 1782 1783 static inline void clear_tsk_need_resched(struct task_struct *tsk) 1784 { 1785 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 1786 } 1787 1788 static inline int test_tsk_need_resched(struct task_struct *tsk) 1789 { 1790 return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 1791 } 1792 1793 /* 1794 * cond_resched() and cond_resched_lock(): latency reduction via 1795 * explicit rescheduling in places that are safe. The return 1796 * value indicates whether a reschedule was done in fact. 1797 * cond_resched_lock() will drop the spinlock before scheduling, 1798 */ 1799 #ifndef CONFIG_PREEMPTION 1800 extern int _cond_resched(void); 1801 #else 1802 static inline int _cond_resched(void) { return 0; } 1803 #endif 1804 1805 #define cond_resched() ({ \ 1806 ___might_sleep(__FILE__, __LINE__, 0); \ 1807 _cond_resched(); \ 1808 }) 1809 1810 extern int __cond_resched_lock(spinlock_t *lock); 1811 1812 #define cond_resched_lock(lock) ({ \ 1813 ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ 1814 __cond_resched_lock(lock); \ 1815 }) 1816 1817 static inline void cond_resched_rcu(void) 1818 { 1819 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) 1820 rcu_read_unlock(); 1821 cond_resched(); 1822 rcu_read_lock(); 1823 #endif 1824 } 1825 1826 /* 1827 * Does a critical section need to be broken due to another 1828 * task waiting?: (technically does not depend on CONFIG_PREEMPTION, 1829 * but a general need for low latency) 1830 */ 1831 static inline int spin_needbreak(spinlock_t *lock) 1832 { 1833 #ifdef CONFIG_PREEMPTION 1834 return spin_is_contended(lock); 1835 #else 1836 return 0; 1837 #endif 1838 } 1839 1840 static __always_inline bool need_resched(void) 1841 { 1842 return unlikely(tif_need_resched()); 1843 } 1844 1845 /* 1846 * Wrappers for p->thread_info->cpu access. No-op on UP. 1847 */ 1848 #ifdef CONFIG_SMP 1849 1850 static inline unsigned int task_cpu(const struct task_struct *p) 1851 { 1852 #ifdef CONFIG_THREAD_INFO_IN_TASK 1853 return READ_ONCE(p->cpu); 1854 #else 1855 return READ_ONCE(task_thread_info(p)->cpu); 1856 #endif 1857 } 1858 1859 extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 1860 1861 #else 1862 1863 static inline unsigned int task_cpu(const struct task_struct *p) 1864 { 1865 return 0; 1866 } 1867 1868 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 1869 { 1870 } 1871 1872 #endif /* CONFIG_SMP */ 1873 1874 /* 1875 * In order to reduce various lock holder preemption latencies provide an 1876 * interface to see if a vCPU is currently running or not. 1877 * 1878 * This allows us to terminate optimistic spin loops and block, analogous to 1879 * the native optimistic spin heuristic of testing if the lock owner task is 1880 * running or not. 1881 */ 1882 #ifndef vcpu_is_preempted 1883 static inline bool vcpu_is_preempted(int cpu) 1884 { 1885 return false; 1886 } 1887 #endif 1888 1889 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 1890 extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 1891 1892 #ifndef TASK_SIZE_OF 1893 #define TASK_SIZE_OF(tsk) TASK_SIZE 1894 #endif 1895 1896 #ifdef CONFIG_RSEQ 1897 1898 /* 1899 * Map the event mask on the user-space ABI enum rseq_cs_flags 1900 * for direct mask checks. 1901 */ 1902 enum rseq_event_mask_bits { 1903 RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, 1904 RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, 1905 RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, 1906 }; 1907 1908 enum rseq_event_mask { 1909 RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), 1910 RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), 1911 RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), 1912 }; 1913 1914 static inline void rseq_set_notify_resume(struct task_struct *t) 1915 { 1916 if (t->rseq) 1917 set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); 1918 } 1919 1920 void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); 1921 1922 static inline void rseq_handle_notify_resume(struct ksignal *ksig, 1923 struct pt_regs *regs) 1924 { 1925 if (current->rseq) 1926 __rseq_handle_notify_resume(ksig, regs); 1927 } 1928 1929 static inline void rseq_signal_deliver(struct ksignal *ksig, 1930 struct pt_regs *regs) 1931 { 1932 preempt_disable(); 1933 __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); 1934 preempt_enable(); 1935 rseq_handle_notify_resume(ksig, regs); 1936 } 1937 1938 /* rseq_preempt() requires preemption to be disabled. */ 1939 static inline void rseq_preempt(struct task_struct *t) 1940 { 1941 __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); 1942 rseq_set_notify_resume(t); 1943 } 1944 1945 /* rseq_migrate() requires preemption to be disabled. */ 1946 static inline void rseq_migrate(struct task_struct *t) 1947 { 1948 __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); 1949 rseq_set_notify_resume(t); 1950 } 1951 1952 /* 1953 * If parent process has a registered restartable sequences area, the 1954 * child inherits. Unregister rseq for a clone with CLONE_VM set. 1955 */ 1956 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) 1957 { 1958 if (clone_flags & CLONE_VM) { 1959 t->rseq = NULL; 1960 t->rseq_sig = 0; 1961 t->rseq_event_mask = 0; 1962 } else { 1963 t->rseq = current->rseq; 1964 t->rseq_sig = current->rseq_sig; 1965 t->rseq_event_mask = current->rseq_event_mask; 1966 } 1967 } 1968 1969 static inline void rseq_execve(struct task_struct *t) 1970 { 1971 t->rseq = NULL; 1972 t->rseq_sig = 0; 1973 t->rseq_event_mask = 0; 1974 } 1975 1976 #else 1977 1978 static inline void rseq_set_notify_resume(struct task_struct *t) 1979 { 1980 } 1981 static inline void rseq_handle_notify_resume(struct ksignal *ksig, 1982 struct pt_regs *regs) 1983 { 1984 } 1985 static inline void rseq_signal_deliver(struct ksignal *ksig, 1986 struct pt_regs *regs) 1987 { 1988 } 1989 static inline void rseq_preempt(struct task_struct *t) 1990 { 1991 } 1992 static inline void rseq_migrate(struct task_struct *t) 1993 { 1994 } 1995 static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) 1996 { 1997 } 1998 static inline void rseq_execve(struct task_struct *t) 1999 { 2000 } 2001 2002 #endif 2003 2004 void __exit_umh(struct task_struct *tsk); 2005 2006 static inline void exit_umh(struct task_struct *tsk) 2007 { 2008 if (unlikely(tsk->flags & PF_UMH)) 2009 __exit_umh(tsk); 2010 } 2011 2012 #ifdef CONFIG_DEBUG_RSEQ 2013 2014 void rseq_syscall(struct pt_regs *regs); 2015 2016 #else 2017 2018 static inline void rseq_syscall(struct pt_regs *regs) 2019 { 2020 } 2021 2022 #endif 2023 2024 const struct sched_avg *sched_trace_cfs_rq_avg(struct cfs_rq *cfs_rq); 2025 char *sched_trace_cfs_rq_path(struct cfs_rq *cfs_rq, char *str, int len); 2026 int sched_trace_cfs_rq_cpu(struct cfs_rq *cfs_rq); 2027 2028 const struct sched_avg *sched_trace_rq_avg_rt(struct rq *rq); 2029 const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq); 2030 const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq); 2031 2032 int sched_trace_rq_cpu(struct rq *rq); 2033 2034 const struct cpumask *sched_trace_rd_span(struct root_domain *rd); 2035 2036 #endif 2037