[deliverable/linux.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_ACCOUNT | __GFP_NOTRACK | \
				 __GFP_ZERO)
#else
# define THREADINFO_GFP		(GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
#endif

/*
 * 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)

#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)

#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
static inline int arch_within_stack_frames(const void * const stack,
					   const void * const stackend,
					   const void *obj, unsigned long len)
{
	return 0;
}
#endif

#ifdef CONFIG_HARDENED_USERCOPY
extern void __check_object_size(const void *ptr, unsigned long n,
					bool to_user);

static inline void check_object_size(const void *ptr, unsigned long n,
				     bool to_user)
{
	__check_object_size(ptr, n, to_user);
}
#else
static inline void check_object_size(const void *ptr, unsigned long n,
				     bool to_user)
{ }
#endif /* CONFIG_HARDENED_USERCOPY */

#endif	/* __KERNEL__ */

#endif /* _LINUX_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	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
ce6bd420	10	#include <linux/types.h>
edd63a27	11	#include <linux/bug.h>
ce6bd420	12
a332d86d TG	13	struct timespec;
	14	struct compat_timespec;
	15
1da177e4	16	/*
ce6bd420	17	* System call restart block.
1da177e4 LT	18	*/
	19	struct restart_block {
	20	long (fn)(struct restart_block );
ce6bd420	21	union {
52400ba9	22	/* For futex_wait and futex_wait_requeue_pi */
ce6bd420	23	struct {
a3c74c52	24	u32 __user *uaddr;
ce6bd420 SR	25	u32 val;
ce6bd420 SR	26	u32 flags;
cd689985	27	u32 bitset;
ce6bd420	28	u64 time;
a3c74c52	29	u32 __user *uaddr2;
ce6bd420	30	} futex;
a332d86d TG	31	/* For nanosleep */
a332d86d TG	32	struct {
ab8177bc	33	clockid_t clockid;
a332d86d TG	34	struct timespec __user *rmtp;
	35	#ifdef CONFIG_COMPAT
	36	struct compat_timespec __user *compat_rmtp;
	37	#endif
	38	u64 expires;
	39	} nanosleep;
be5dad20 TG	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;
ce6bd420	48	};
1da177e4 LT	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
2889f608	58	#ifdef CONFIG_DEBUG_STACK_USAGE
5d097056 VD	59	# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT \| __GFP_NOTRACK \| \
5d097056 VD	60	__GFP_ZERO)
2889f608	61	#else
5d097056	62	# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT \| __GFP_NOTRACK)
2889f608 TG	63	#endif
2889f608 TG	64
1da177e4 LT	65	/*
	66	* flag set/clear/test wrappers
	67	* - pass TIF_xxxx constants to these functions
	68	*/
	69
1da177e4 LT	70	static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
1da177e4 LT	71	{
5548fecd	72	set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	73	}
	74
	75	static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
	76	{
5548fecd	77	clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	78	}
	79
	80	static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
	81	{
5548fecd	82	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	83	}
	84
	85	static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
	86	{
5548fecd	87	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	88	}
	89
	90	static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
	91	{
5548fecd	92	return test_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	93	}
1da177e4 LT	94
3b66a1ed RZ	95	#define set_thread_flag(flag) \
	96	set_ti_thread_flag(current_thread_info(), flag)
	97	#define clear_thread_flag(flag) \
	98	clear_ti_thread_flag(current_thread_info(), flag)
	99	#define test_and_set_thread_flag(flag) \
	100	test_and_set_ti_thread_flag(current_thread_info(), flag)
	101	#define test_and_clear_thread_flag(flag) \
	102	test_and_clear_ti_thread_flag(current_thread_info(), flag)
	103	#define test_thread_flag(flag) \
	104	test_ti_thread_flag(current_thread_info(), flag)
	105
ea811747 PZ	106	#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
ea811747 PZ	107
0f60a8ef KC	108	#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
	109	static inline int arch_within_stack_frames(const void * const stack,
	110	const void * const stackend,
	111	const void *obj, unsigned long len)
	112	{
	113	return 0;
	114	}
	115	#endif
	116
f5509cc1 KC	117	#ifdef CONFIG_HARDENED_USERCOPY
	118	extern void __check_object_size(const void *ptr, unsigned long n,
	119	bool to_user);
	120
	121	static inline void check_object_size(const void *ptr, unsigned long n,
	122	bool to_user)
	123	{
	124	__check_object_size(ptr, n, to_user);
	125	}
	126	#else
	127	static inline void check_object_size(const void *ptr, unsigned long n,
	128	bool to_user)
	129	{ }
	130	#endif /* CONFIG_HARDENED_USERCOPY */
	131
4e4c22c7	132	#endif /* __KERNEL__ */
1da177e4 LT	133
1da177e4 LT	134	#endif /* _LINUX_THREAD_INFO_H */