1 /* thread_info.h: common low-level thread information accessors 2 * 3 * Copyright (C) 2002 David Howells (dhowells@redhat.com) 4 * - Incorporating suggestions made by Linus Torvalds 5 */ 6 7 #ifndef _LINUX_THREAD_INFO_H 8 #define _LINUX_THREAD_INFO_H 9 10 #include <linux/types.h> 11 #include <linux/bug.h> 12 13 struct timespec; 14 struct compat_timespec; 15 16 #ifdef CONFIG_THREAD_INFO_IN_TASK 17 #define current_thread_info() ((struct thread_info *)current) 18 #endif 19 20 /* 21 * System call restart block. 22 */ 23 struct restart_block { 24 long (*fn)(struct restart_block *); 25 union { 26 /* For futex_wait and futex_wait_requeue_pi */ 27 struct { 28 u32 __user *uaddr; 29 u32 val; 30 u32 flags; 31 u32 bitset; 32 u64 time; 33 u32 __user *uaddr2; 34 } futex; 35 /* For nanosleep */ 36 struct { 37 clockid_t clockid; 38 struct timespec __user *rmtp; 39 #ifdef CONFIG_COMPAT 40 struct compat_timespec __user *compat_rmtp; 41 #endif 42 u64 expires; 43 } nanosleep; 44 /* For poll */ 45 struct { 46 struct pollfd __user *ufds; 47 int nfds; 48 int has_timeout; 49 unsigned long tv_sec; 50 unsigned long tv_nsec; 51 } poll; 52 }; 53 }; 54 55 extern long do_no_restart_syscall(struct restart_block *parm); 56 57 #include <linux/bitops.h> 58 #include <asm/thread_info.h> 59 60 #ifdef __KERNEL__ 61 62 #ifdef CONFIG_DEBUG_STACK_USAGE 63 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ 64 __GFP_ZERO) 65 #else 66 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) 67 #endif 68 69 /* 70 * flag set/clear/test wrappers 71 * - pass TIF_xxxx constants to these functions 72 */ 73 74 static inline void set_ti_thread_flag(struct thread_info *ti, int flag) 75 { 76 set_bit(flag, (unsigned long *)&ti->flags); 77 } 78 79 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) 80 { 81 clear_bit(flag, (unsigned long *)&ti->flags); 82 } 83 84 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) 85 { 86 return test_and_set_bit(flag, (unsigned long *)&ti->flags); 87 } 88 89 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) 90 { 91 return test_and_clear_bit(flag, (unsigned long *)&ti->flags); 92 } 93 94 static inline int test_ti_thread_flag(struct thread_info *ti, int flag) 95 { 96 return test_bit(flag, (unsigned long *)&ti->flags); 97 } 98 99 #define set_thread_flag(flag) \ 100 set_ti_thread_flag(current_thread_info(), flag) 101 #define clear_thread_flag(flag) \ 102 clear_ti_thread_flag(current_thread_info(), flag) 103 #define test_and_set_thread_flag(flag) \ 104 test_and_set_ti_thread_flag(current_thread_info(), flag) 105 #define test_and_clear_thread_flag(flag) \ 106 test_and_clear_ti_thread_flag(current_thread_info(), flag) 107 #define test_thread_flag(flag) \ 108 test_ti_thread_flag(current_thread_info(), flag) 109 110 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) 111 112 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES 113 static inline int arch_within_stack_frames(const void * const stack, 114 const void * const stackend, 115 const void *obj, unsigned long len) 116 { 117 return 0; 118 } 119 #endif 120 121 #ifdef CONFIG_HARDENED_USERCOPY 122 extern void __check_object_size(const void *ptr, unsigned long n, 123 bool to_user); 124 125 static __always_inline void check_object_size(const void *ptr, unsigned long n, 126 bool to_user) 127 { 128 if (!__builtin_constant_p(n)) 129 __check_object_size(ptr, n, to_user); 130 } 131 #else 132 static inline void check_object_size(const void *ptr, unsigned long n, 133 bool to_user) 134 { } 135 #endif /* CONFIG_HARDENED_USERCOPY */ 136 137 #endif /* __KERNEL__ */ 138 139 #endif /* _LINUX_THREAD_INFO_H */ 140