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>
12 #include <linux/restart_block.h>
14 #ifdef CONFIG_THREAD_INFO_IN_TASK
16 * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the
17 * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels,
18 * including <asm/current.h> can cause a circular dependency on some platforms.
20 #include <asm/current.h>
21 #define current_thread_info() ((struct thread_info *)current)
24 #include <linux/bitops.h>
27 * For per-arch arch_within_stack_frames() implementations, defined in
37 #include <asm/thread_info.h>
41 #ifdef CONFIG_DEBUG_STACK_USAGE
42 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
45 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
49 * flag set/clear/test wrappers
50 * - pass TIF_xxxx constants to these functions
53 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
55 set_bit(flag, (unsigned long *)&ti->flags);
58 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
60 clear_bit(flag, (unsigned long *)&ti->flags);
63 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
65 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
68 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
70 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
73 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
75 return test_bit(flag, (unsigned long *)&ti->flags);
78 #define set_thread_flag(flag) \
79 set_ti_thread_flag(current_thread_info(), flag)
80 #define clear_thread_flag(flag) \
81 clear_ti_thread_flag(current_thread_info(), flag)
82 #define test_and_set_thread_flag(flag) \
83 test_and_set_ti_thread_flag(current_thread_info(), flag)
84 #define test_and_clear_thread_flag(flag) \
85 test_and_clear_ti_thread_flag(current_thread_info(), flag)
86 #define test_thread_flag(flag) \
87 test_ti_thread_flag(current_thread_info(), flag)
89 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
91 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
92 static inline int arch_within_stack_frames(const void * const stack,
93 const void * const stackend,
94 const void *obj, unsigned long len)
100 #ifdef CONFIG_HARDENED_USERCOPY
101 extern void __check_object_size(const void *ptr, unsigned long n,
104 static __always_inline void check_object_size(const void *ptr, unsigned long n,
107 if (!__builtin_constant_p(n))
108 __check_object_size(ptr, n, to_user);
111 static inline void check_object_size(const void *ptr, unsigned long n,
114 #endif /* CONFIG_HARDENED_USERCOPY */
116 #ifndef arch_setup_new_exec
117 static inline void arch_setup_new_exec(void) { }
120 #endif /* __KERNEL__ */
122 #endif /* _LINUX_THREAD_INFO_H */