Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 10 | #include <linux/types.h> |
Al Viro | edd63a2 | 2012-04-27 13:42:45 -0400 | [diff] [blame] | 11 | #include <linux/bug.h> |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 12 | |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 13 | struct timespec; |
| 14 | struct compat_timespec; |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | /* |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 17 | * System call restart block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | struct restart_block { |
| 20 | long (*fn)(struct restart_block *); |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 21 | union { |
Darren Hart | 52400ba | 2009-04-03 13:40:49 -0700 | [diff] [blame] | 22 | /* For futex_wait and futex_wait_requeue_pi */ |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 23 | struct { |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 24 | u32 __user *uaddr; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 25 | u32 val; |
| 26 | u32 flags; |
Thomas Gleixner | cd68998 | 2008-02-01 17:45:14 +0100 | [diff] [blame] | 27 | u32 bitset; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 28 | u64 time; |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 29 | u32 __user *uaddr2; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 30 | } futex; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 31 | /* For nanosleep */ |
| 32 | struct { |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 33 | clockid_t clockid; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 34 | struct timespec __user *rmtp; |
| 35 | #ifdef CONFIG_COMPAT |
| 36 | struct compat_timespec __user *compat_rmtp; |
| 37 | #endif |
| 38 | u64 expires; |
| 39 | } nanosleep; |
Thomas Gleixner | be5dad2 | 2008-08-31 08:19:15 -0700 | [diff] [blame] | 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; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 48 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Thomas Gleixner | 2889f60 | 2012-05-05 15:05:41 +0000 | [diff] [blame] | 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 | |
Glauber Costa | 2ad306b | 2012-12-18 14:22:18 -0800 | [diff] [blame^] | 64 | #define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG) |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | /* |
| 67 | * flag set/clear/test wrappers |
| 68 | * - pass TIF_xxxx constants to these functions |
| 69 | */ |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| 72 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 73 | set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 77 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 78 | clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| 82 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 83 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 87 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 88 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| 92 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 93 | return test_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
Roman Zippel | 3b66a1e | 2005-11-13 16:06:59 -0800 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Roman Zippel | 3b66a1e | 2005-11-13 16:06:59 -0800 | [diff] [blame] | 107 | #define set_need_resched() set_thread_flag(TIF_NEED_RESCHED) |
| 108 | #define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Roland McGrath | f3de272 | 2008-04-30 00:53:09 -0700 | [diff] [blame] | 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 | |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 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 |
Roland McGrath | 7648d96 | 2008-04-30 00:53:07 -0700 | [diff] [blame] | 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. |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 127 | */ |
| 128 | static inline void set_restore_sigmask(void) |
| 129 | { |
| 130 | set_thread_flag(TIF_RESTORE_SIGMASK); |
Al Viro | edd63a2 | 2012-04-27 13:42:45 -0400 | [diff] [blame] | 131 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 132 | } |
Al Viro | 4ebefe3 | 2012-04-26 22:29:20 -0400 | [diff] [blame] | 133 | static inline void clear_restore_sigmask(void) |
| 134 | { |
| 135 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 136 | } |
| 137 | static inline bool test_restore_sigmask(void) |
| 138 | { |
| 139 | return test_thread_flag(TIF_RESTORE_SIGMASK); |
| 140 | } |
| 141 | static inline bool test_and_clear_restore_sigmask(void) |
| 142 | { |
| 143 | return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 144 | } |
Roland McGrath | f3de272 | 2008-04-30 00:53:09 -0700 | [diff] [blame] | 145 | #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 146 | |
Al Viro | 754421c | 2012-04-26 18:31:00 -0400 | [diff] [blame] | 147 | #ifndef HAVE_SET_RESTORE_SIGMASK |
| 148 | #error "no set_restore_sigmask() provided and default one won't work" |
| 149 | #endif |
| 150 | |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 151 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | |
| 153 | #endif /* _LINUX_THREAD_INFO_H */ |