1 /* thread_info.h: common low-level thread information accessors
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds
7 #ifndef _LINUX_THREAD_INFO_H
8 #define _LINUX_THREAD_INFO_H
10 #include <linux/types.h>
11 #include <linux/bug.h>
14 struct compat_timespec;
16 #ifdef CONFIG_THREAD_INFO_IN_TASK
18 unsigned long flags; /* low level flags */
21 #define INIT_THREAD_INFO(tsk) \
27 #ifdef CONFIG_THREAD_INFO_IN_TASK
28 #define current_thread_info() ((struct thread_info *)current)
32 * System call restart block.
34 struct restart_block {
35 long (*fn)(struct restart_block *);
37 /* For futex_wait and futex_wait_requeue_pi */
49 struct timespec __user *rmtp;
51 struct compat_timespec __user *compat_rmtp;
57 struct pollfd __user *ufds;
61 unsigned long tv_nsec;
66 extern long do_no_restart_syscall(struct restart_block *parm);
68 #include <linux/bitops.h>
69 #include <asm/thread_info.h>
73 #ifdef CONFIG_DEBUG_STACK_USAGE
74 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
77 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
81 * flag set/clear/test wrappers
82 * - pass TIF_xxxx constants to these functions
85 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
87 set_bit(flag, (unsigned long *)&ti->flags);
90 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
92 clear_bit(flag, (unsigned long *)&ti->flags);
95 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
97 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
100 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
102 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
105 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
107 return test_bit(flag, (unsigned long *)&ti->flags);
110 #define set_thread_flag(flag) \
111 set_ti_thread_flag(current_thread_info(), flag)
112 #define clear_thread_flag(flag) \
113 clear_ti_thread_flag(current_thread_info(), flag)
114 #define test_and_set_thread_flag(flag) \
115 test_and_set_ti_thread_flag(current_thread_info(), flag)
116 #define test_and_clear_thread_flag(flag) \
117 test_and_clear_ti_thread_flag(current_thread_info(), flag)
118 #define test_thread_flag(flag) \
119 test_ti_thread_flag(current_thread_info(), flag)
121 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
123 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
124 static inline int arch_within_stack_frames(const void * const stack,
125 const void * const stackend,
126 const void *obj, unsigned long len)
132 #ifdef CONFIG_HARDENED_USERCOPY
133 extern void __check_object_size(const void *ptr, unsigned long n,
136 static __always_inline void check_object_size(const void *ptr, unsigned long n,
139 if (!__builtin_constant_p(n))
140 __check_object_size(ptr, n, to_user);
143 static inline void check_object_size(const void *ptr, unsigned long n,
146 #endif /* CONFIG_HARDENED_USERCOPY */
148 #endif /* __KERNEL__ */
150 #endif /* _LINUX_THREAD_INFO_H */