Commit | Line | Data |
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1da177e4 LT |
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 | ||
ce6bd420 | 10 | #include <linux/types.h> |
edd63a27 | 11 | #include <linux/bug.h> |
53d74d05 | 12 | #include <linux/restart_block.h> |
a332d86d | 13 | |
c65eacbe | 14 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
dc3d2a67 MR |
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> | |
c65eacbe AL |
21 | #define current_thread_info() ((struct thread_info *)current) |
22 | #endif | |
23 | ||
1da177e4 | 24 | #include <linux/bitops.h> |
96dc4f9f S |
25 | |
26 | /* | |
27 | * For per-arch arch_within_stack_frames() implementations, defined in | |
28 | * asm/thread_info.h. | |
29 | */ | |
30 | enum { | |
31 | BAD_STACK = -1, | |
32 | NOT_STACK = 0, | |
33 | GOOD_FRAME, | |
34 | GOOD_STACK, | |
35 | }; | |
36 | ||
1da177e4 LT |
37 | #include <asm/thread_info.h> |
38 | ||
39 | #ifdef __KERNEL__ | |
40 | ||
2889f608 | 41 | #ifdef CONFIG_DEBUG_STACK_USAGE |
5d097056 VD |
42 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ |
43 | __GFP_ZERO) | |
2889f608 | 44 | #else |
5d097056 | 45 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) |
2889f608 TG |
46 | #endif |
47 | ||
1da177e4 LT |
48 | /* |
49 | * flag set/clear/test wrappers | |
50 | * - pass TIF_xxxx constants to these functions | |
51 | */ | |
52 | ||
1da177e4 LT |
53 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
54 | { | |
5548fecd | 55 | set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
56 | } |
57 | ||
58 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) | |
59 | { | |
5548fecd | 60 | clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
61 | } |
62 | ||
63 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) | |
64 | { | |
5548fecd | 65 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
66 | } |
67 | ||
68 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) | |
69 | { | |
5548fecd | 70 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
71 | } |
72 | ||
73 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) | |
74 | { | |
5548fecd | 75 | return test_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
76 | } |
77 | ||
3b66a1ed RZ |
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) | |
88 | ||
ea811747 PZ |
89 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
90 | ||
0f60a8ef KC |
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) | |
95 | { | |
96 | return 0; | |
97 | } | |
98 | #endif | |
99 | ||
f5509cc1 KC |
100 | #ifdef CONFIG_HARDENED_USERCOPY |
101 | extern void __check_object_size(const void *ptr, unsigned long n, | |
102 | bool to_user); | |
103 | ||
a85d6b82 KC |
104 | static __always_inline void check_object_size(const void *ptr, unsigned long n, |
105 | bool to_user) | |
f5509cc1 | 106 | { |
81409e9e KC |
107 | if (!__builtin_constant_p(n)) |
108 | __check_object_size(ptr, n, to_user); | |
f5509cc1 KC |
109 | } |
110 | #else | |
111 | static inline void check_object_size(const void *ptr, unsigned long n, | |
112 | bool to_user) | |
113 | { } | |
114 | #endif /* CONFIG_HARDENED_USERCOPY */ | |
115 | ||
e9ea1e7f KH |
116 | #ifndef arch_setup_new_exec |
117 | static inline void arch_setup_new_exec(void) { } | |
118 | #endif | |
119 | ||
4e4c22c7 | 120 | #endif /* __KERNEL__ */ |
1da177e4 LT |
121 | |
122 | #endif /* _LINUX_THREAD_INFO_H */ |