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 #include <linux/restart_block.h>
13
14 #ifdef CONFIG_THREAD_INFO_IN_TASK
15 /*
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.
19 */
20 #include <asm/current.h>
21 #define current_thread_info() ((struct thread_info *)current)
22 #endif
23
24 #include <linux/bitops.h>
25 #include <asm/thread_info.h>
26
27 #ifdef __KERNEL__
28
29 #ifdef CONFIG_DEBUG_STACK_USAGE
30 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
31 __GFP_ZERO)
32 #else
33 # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
34 #endif
35
36 /*
37 * flag set/clear/test wrappers
38 * - pass TIF_xxxx constants to these functions
39 */
40
set_ti_thread_flag(struct thread_info * ti,int flag)41 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
42 {
43 set_bit(flag, (unsigned long *)&ti->flags);
44 }
45
clear_ti_thread_flag(struct thread_info * ti,int flag)46 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
47 {
48 clear_bit(flag, (unsigned long *)&ti->flags);
49 }
50
test_and_set_ti_thread_flag(struct thread_info * ti,int flag)51 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
52 {
53 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
54 }
55
test_and_clear_ti_thread_flag(struct thread_info * ti,int flag)56 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
57 {
58 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
59 }
60
test_ti_thread_flag(struct thread_info * ti,int flag)61 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
62 {
63 return test_bit(flag, (unsigned long *)&ti->flags);
64 }
65
66 #define set_thread_flag(flag) \
67 set_ti_thread_flag(current_thread_info(), flag)
68 #define clear_thread_flag(flag) \
69 clear_ti_thread_flag(current_thread_info(), flag)
70 #define test_and_set_thread_flag(flag) \
71 test_and_set_ti_thread_flag(current_thread_info(), flag)
72 #define test_and_clear_thread_flag(flag) \
73 test_and_clear_ti_thread_flag(current_thread_info(), flag)
74 #define test_thread_flag(flag) \
75 test_ti_thread_flag(current_thread_info(), flag)
76
77 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
78
79 #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
arch_within_stack_frames(const void * const stack,const void * const stackend,const void * obj,unsigned long len)80 static inline int arch_within_stack_frames(const void * const stack,
81 const void * const stackend,
82 const void *obj, unsigned long len)
83 {
84 return 0;
85 }
86 #endif
87
88 #ifdef CONFIG_HARDENED_USERCOPY
89 extern void __check_object_size(const void *ptr, unsigned long n,
90 bool to_user);
91
check_object_size(const void * ptr,unsigned long n,bool to_user)92 static __always_inline void check_object_size(const void *ptr, unsigned long n,
93 bool to_user)
94 {
95 if (!__builtin_constant_p(n))
96 __check_object_size(ptr, n, to_user);
97 }
98 #else
check_object_size(const void * ptr,unsigned long n,bool to_user)99 static inline void check_object_size(const void *ptr, unsigned long n,
100 bool to_user)
101 { }
102 #endif /* CONFIG_HARDENED_USERCOPY */
103
104 #endif /* __KERNEL__ */
105
106 #endif /* _LINUX_THREAD_INFO_H */
107