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
13 struct timespec;
14 struct compat_timespec;
15
16 /*
17 * System call restart block.
18 */
19 struct 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
51 extern 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
set_ti_thread_flag(struct thread_info * ti,int flag)71 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
72 {
73 set_bit(flag, (unsigned long *)&ti->flags);
74 }
75
clear_ti_thread_flag(struct thread_info * ti,int flag)76 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
77 {
78 clear_bit(flag, (unsigned long *)&ti->flags);
79 }
80
test_and_set_ti_thread_flag(struct thread_info * ti,int flag)81 static 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
test_and_clear_ti_thread_flag(struct thread_info * ti,int flag)86 static 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
test_ti_thread_flag(struct thread_info * ti,int flag)91 static 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
107 #define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
108 #define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
109
110 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
111 /*
112 * An arch can define its own version of set_restore_sigmask() to get the
113 * job done however works, with or without TIF_RESTORE_SIGMASK.
114 */
115 #define HAVE_SET_RESTORE_SIGMASK 1
116
117 /**
118 * set_restore_sigmask() - make sure saved_sigmask processing gets done
119 *
120 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
121 * will run before returning to user mode, to process the flag. For
122 * all callers, TIF_SIGPENDING is already set or it's no harm to set
123 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
124 * arch code will notice on return to user mode, in case those bits
125 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
126 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
127 */
set_restore_sigmask(void)128 static inline void set_restore_sigmask(void)
129 {
130 set_thread_flag(TIF_RESTORE_SIGMASK);
131 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
132 }
clear_restore_sigmask(void)133 static inline void clear_restore_sigmask(void)
134 {
135 clear_thread_flag(TIF_RESTORE_SIGMASK);
136 }
test_restore_sigmask(void)137 static inline bool test_restore_sigmask(void)
138 {
139 return test_thread_flag(TIF_RESTORE_SIGMASK);
140 }
test_and_clear_restore_sigmask(void)141 static inline bool test_and_clear_restore_sigmask(void)
142 {
143 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
144 }
145 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
146
147 #ifndef HAVE_SET_RESTORE_SIGMASK
148 #error "no set_restore_sigmask() provided and default one won't work"
149 #endif
150
151 #endif /* __KERNEL__ */
152
153 #endif /* _LINUX_THREAD_INFO_H */
154