LXR linux/include/linux/thread

   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#ifdef CONFIG_THREAD_INFO_IN_TASK
  17#define current_thread_info() ((struct thread_info *)current)
  18#endif
  19
  20/*
  21 * System call restart block.
  22 */
  23struct restart_block {
  24        long (*fn)(struct restart_block *);
  25        union {
  26                /* For futex_wait and futex_wait_requeue_pi */
  27                struct {
  28                        u32 __user *uaddr;
  29                        u32 val;
  30                        u32 flags;
  31                        u32 bitset;
  32                        u64 time;
  33                        u32 __user *uaddr2;
  34                } futex;
  35                /* For nanosleep */
  36                struct {
  37                        clockid_t clockid;
  38                        struct timespec __user *rmtp;
  39#ifdef CONFIG_COMPAT
  40                        struct compat_timespec __user *compat_rmtp;
  41#endif
  42                        u64 expires;
  43                } nanosleep;
  44                /* For poll */
  45                struct {
  46                        struct pollfd __user *ufds;
  47                        int nfds;
  48                        int has_timeout;
  49                        unsigned long tv_sec;
  50                        unsigned long tv_nsec;
  51                } poll;
  52        };
  53};
  54
  55extern long do_no_restart_syscall(struct restart_block *parm);
  56
  57#include <linux/bitops.h>
  58#include <asm/thread_info.h>
  59
  60#ifdef __KERNEL__
  61
  62#ifdef CONFIG_DEBUG_STACK_USAGE
  63# define THREADINFO_GFP         (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
  64                                 __GFP_ZERO)
  65#else
  66# define THREADINFO_GFP         (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
  67#endif
  68
  69/*
  70 * flag set/clear/test wrappers
  71 * - pass TIF_xxxx constants to these functions
  72 */
  73
  74static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  75{
  76        set_bit(flag, (unsigned long *)&ti->flags);
  77}
  78
  79static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  80{
  81        clear_bit(flag, (unsigned long *)&ti->flags);
  82}
  83
  84static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
  85{
  86        return test_and_set_bit(flag, (unsigned long *)&ti->flags);
  87}
  88
  89static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
  90{
  91        return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
  92}
  93
  94static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  95{
  96        return test_bit(flag, (unsigned long *)&ti->flags);
  97}
  98
  99#define set_thread_flag(flag) \
 100        set_ti_thread_flag(current_thread_info(), flag)
 101#define clear_thread_flag(flag) \
 102        clear_ti_thread_flag(current_thread_info(), flag)
 103#define test_and_set_thread_flag(flag) \
 104        test_and_set_ti_thread_flag(current_thread_info(), flag)
 105#define test_and_clear_thread_flag(flag) \
 106        test_and_clear_ti_thread_flag(current_thread_info(), flag)
 107#define test_thread_flag(flag) \
 108        test_ti_thread_flag(current_thread_info(), flag)
 109
 110#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
 111
 112#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
 113static inline int arch_within_stack_frames(const void * const stack,
 114                                           const void * const stackend,
 115                                           const void *obj, unsigned long len)
 116{
 117        return 0;
 118}
 119#endif
 120
 121#ifdef CONFIG_HARDENED_USERCOPY
 122extern void __check_object_size(const void *ptr, unsigned long n,
 123                                        bool to_user);
 124
 125static __always_inline void check_object_size(const void *ptr, unsigned long n,
 126                                              bool to_user)
 127{
 128        if (!__builtin_constant_p(n))
 129                __check_object_size(ptr, n, to_user);
 130}
 131#else
 132static inline void check_object_size(const void *ptr, unsigned long n,
 133                                     bool to_user)
 134{ }
 135#endif /* CONFIG_HARDENED_USERCOPY */
 136
 137#endif  /* __KERNEL__ */
 138
 139#endif /* _LINUX_THREAD_INFO_H */
 140