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