[mirror_ubuntu-artful-kernel.git] / include / linux / thread_info.h

/* thread_info.h: common low-level thread information accessors
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds
 */

#ifndef _LINUX_THREAD_INFO_H
#define _LINUX_THREAD_INFO_H

#include <linux/types.h>
#include <linux/bug.h>

struct timespec;
struct compat_timespec;

/*
 * System call restart block.
 */
struct restart_block {
	long (*fn)(struct restart_block *);
	union {
		/* For futex_wait and futex_wait_requeue_pi */
		struct {
			u32 __user *uaddr;
			u32 val;
			u32 flags;
			u32 bitset;
			u64 time;
			u32 __user *uaddr2;
		} futex;
		/* For nanosleep */
		struct {
			clockid_t clockid;
			struct timespec __user *rmtp;
#ifdef CONFIG_COMPAT
			struct compat_timespec __user *compat_rmtp;
#endif
			u64 expires;
		} nanosleep;
		/* For poll */
		struct {
			struct pollfd __user *ufds;
			int nfds;
			int has_timeout;
			unsigned long tv_sec;
			unsigned long tv_nsec;
		} poll;
	};
};

extern long do_no_restart_syscall(struct restart_block *parm);

#include <linux/bitops.h>
#include <asm/thread_info.h>

#ifdef __KERNEL__

#ifdef CONFIG_DEBUG_STACK_USAGE
# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
#else
# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK)
#endif

#define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG)

/*
 * flag set/clear/test wrappers
 * - pass TIF_xxxx constants to these functions
 */

static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
{
	set_bit(flag, (unsigned long *)&ti->flags);
}

static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
{
	clear_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
{
	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
{
	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
{
	return test_bit(flag, (unsigned long *)&ti->flags);
}

#define set_thread_flag(flag) \
	set_ti_thread_flag(current_thread_info(), flag)
#define clear_thread_flag(flag) \
	clear_ti_thread_flag(current_thread_info(), flag)
#define test_and_set_thread_flag(flag) \
	test_and_set_ti_thread_flag(current_thread_info(), flag)
#define test_and_clear_thread_flag(flag) \
	test_and_clear_ti_thread_flag(current_thread_info(), flag)
#define test_thread_flag(flag) \
	test_ti_thread_flag(current_thread_info(), flag)

static inline __deprecated void set_need_resched(void)
{
	/*
	 * Use of this function in deprecated.
	 *
	 * As of this writing there are only a few users in the DRM tree left
	 * all of which are wrong and can be removed without causing too much
	 * grief.
	 *
	 * The DRM people are aware and are working on removing the last few
	 * instances.
	 */
}

#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)

#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
/*
 * An arch can define its own version of set_restore_sigmask() to get the
 * job done however works, with or without TIF_RESTORE_SIGMASK.
 */
#define HAVE_SET_RESTORE_SIGMASK	1

/**
 * set_restore_sigmask() - make sure saved_sigmask processing gets done
 *
 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
 * will run before returning to user mode, to process the flag.  For
 * all callers, TIF_SIGPENDING is already set or it's no harm to set
 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
 * arch code will notice on return to user mode, in case those bits
 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
 */
static inline void set_restore_sigmask(void)
{
	set_thread_flag(TIF_RESTORE_SIGMASK);
	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
}
static inline void clear_restore_sigmask(void)
{
	clear_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_restore_sigmask(void)
{
	return test_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_and_clear_restore_sigmask(void)
{
	return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
}
#endif	/* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */

#ifndef HAVE_SET_RESTORE_SIGMASK
#error "no set_restore_sigmask() provided and default one won't work"
#endif

#endif	/* __KERNEL__ */

#endif /* _LINUX_THREAD_INFO_H */
Commit	Line	Data
	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
	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
	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
	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
	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
	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	static 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	*/
	141	static inline void set_restore_sigmask(void)
	142	{
	143	set_thread_flag(TIF_RESTORE_SIGMASK);
	144	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
	145	}
	146	static inline void clear_restore_sigmask(void)
	147	{
	148	clear_thread_flag(TIF_RESTORE_SIGMASK);
	149	}
	150	static inline bool test_restore_sigmask(void)
	151	{
	152	return test_thread_flag(TIF_RESTORE_SIGMASK);
	153	}
	154	static 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 */