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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
41static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
42{
43 set_bit(flag, (unsigned long *)&ti->flags);
44}
45
46static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
47{
48 clear_bit(flag, (unsigned long *)&ti->flags);
49}
50
51static 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
56static 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
61static 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
80static 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
89extern void __check_object_size(const void *ptr, unsigned long n,
90 bool to_user);
91
92static __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
99static 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 */