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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
13struct timespec;
14struct compat_timespec;
15
16/*
17 * System call restart block.
18 */
19struct restart_block {
20 long (*fn)(struct restart_block *);
21 union {
22 /* For futex_wait and futex_wait_requeue_pi */
23 struct {
24 u32 __user *uaddr;
25 u32 val;
26 u32 flags;
27 u32 bitset;
28 u64 time;
29 u32 __user *uaddr2;
30 } futex;
31 /* For nanosleep */
32 struct {
33 clockid_t clockid;
34 struct timespec __user *rmtp;
35#ifdef CONFIG_COMPAT
36 struct compat_timespec __user *compat_rmtp;
37#endif
38 u64 expires;
39 } nanosleep;
40 /* For poll */
41 struct {
42 struct pollfd __user *ufds;
43 int nfds;
44 int has_timeout;
45 unsigned long tv_sec;
46 unsigned long tv_nsec;
47 } poll;
48 };
49};
50
51extern long do_no_restart_syscall(struct restart_block *parm);
52
53#include <linux/bitops.h>
54#include <asm/thread_info.h>
55
56#ifdef __KERNEL__
57
58#ifdef CONFIG_DEBUG_STACK_USAGE
59# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
60#else
61# define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK)
62#endif
63
64#define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG)
65
66/*
67 * flag set/clear/test wrappers
68 * - pass TIF_xxxx constants to these functions
69 */
70
71static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
72{
73 set_bit(flag, (unsigned long *)&ti->flags);
74}
75
76static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
77{
78 clear_bit(flag, (unsigned long *)&ti->flags);
79}
80
81static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
82{
83 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
84}
85
86static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
87{
88 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
89}
90
91static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
92{
93 return test_bit(flag, (unsigned long *)&ti->flags);
94}
95
96#define set_thread_flag(flag) \
97 set_ti_thread_flag(current_thread_info(), flag)
98#define clear_thread_flag(flag) \
99 clear_ti_thread_flag(current_thread_info(), flag)
100#define test_and_set_thread_flag(flag) \
101 test_and_set_ti_thread_flag(current_thread_info(), flag)
102#define test_and_clear_thread_flag(flag) \
103 test_and_clear_ti_thread_flag(current_thread_info(), flag)
104#define test_thread_flag(flag) \
105 test_ti_thread_flag(current_thread_info(), flag)
106
107static inline __deprecated void set_need_resched(void)
108{
109 /*
110 * Use of this function in deprecated.
111 *
112 * As of this writing there are only a few users in the DRM tree left
113 * all of which are wrong and can be removed without causing too much
114 * grief.
115 *
116 * The DRM people are aware and are working on removing the last few
117 * instances.
118 */
119}
120
121#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
122
123#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
124/*
125 * An arch can define its own version of set_restore_sigmask() to get the
126 * job done however works, with or without TIF_RESTORE_SIGMASK.
127 */
128#define HAVE_SET_RESTORE_SIGMASK 1
129
130/**
131 * set_restore_sigmask() - make sure saved_sigmask processing gets done
132 *
133 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
134 * will run before returning to user mode, to process the flag. For
135 * all callers, TIF_SIGPENDING is already set or it's no harm to set
136 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
137 * arch code will notice on return to user mode, in case those bits
138 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
139 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
140 */
141static inline void set_restore_sigmask(void)
142{
143 set_thread_flag(TIF_RESTORE_SIGMASK);
144 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
145}
146static inline void clear_restore_sigmask(void)
147{
148 clear_thread_flag(TIF_RESTORE_SIGMASK);
149}
150static inline bool test_restore_sigmask(void)
151{
152 return test_thread_flag(TIF_RESTORE_SIGMASK);
153}
154static inline bool test_and_clear_restore_sigmask(void)
155{
156 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
157}
158#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
159
160#ifndef HAVE_SET_RESTORE_SIGMASK
161#error "no set_restore_sigmask() provided and default one won't work"
162#endif
163
164#endif /* __KERNEL__ */
165
166#endif /* _LINUX_THREAD_INFO_H */