[deliverable/linux.git] / include / linux / rwlock_api_smp.h

#ifndef __LINUX_RWLOCK_API_SMP_H
#define __LINUX_RWLOCK_API_SMP_H

#ifndef __LINUX_SPINLOCK_API_SMP_H
# error "please don't include this file directly"
#endif

/*
 * include/linux/rwlock_api_smp.h
 *
 * spinlock API declarations on SMP (and debug)
 * (implemented in kernel/spinlock.c)
 *
 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
 * Released under the General Public License (GPL).
 */

void __lockfunc _raw_read_lock(rwlock_t *lock)		__acquires(lock);
void __lockfunc _raw_write_lock(rwlock_t *lock)		__acquires(lock);
void __lockfunc _raw_read_lock_bh(rwlock_t *lock)	__acquires(lock);
void __lockfunc _raw_write_lock_bh(rwlock_t *lock)	__acquires(lock);
void __lockfunc _raw_read_lock_irq(rwlock_t *lock)	__acquires(lock);
void __lockfunc _raw_write_lock_irq(rwlock_t *lock)	__acquires(lock);
unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
							__acquires(lock);
unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
							__acquires(lock);
int __lockfunc _raw_read_trylock(rwlock_t *lock);
int __lockfunc _raw_write_trylock(rwlock_t *lock);
void __lockfunc _raw_read_unlock(rwlock_t *lock)	__releases(lock);
void __lockfunc _raw_write_unlock(rwlock_t *lock)	__releases(lock);
void __lockfunc _raw_read_unlock_bh(rwlock_t *lock)	__releases(lock);
void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)	__releases(lock);
void __lockfunc _raw_read_unlock_irq(rwlock_t *lock)	__releases(lock);
void __lockfunc _raw_write_unlock_irq(rwlock_t *lock)	__releases(lock);
void __lockfunc
_raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
							__releases(lock);
void __lockfunc
_raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
							__releases(lock);

#ifdef CONFIG_INLINE_READ_LOCK
#define _raw_read_lock(lock) __raw_read_lock(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_LOCK
#define _raw_write_lock(lock) __raw_write_lock(lock)
#endif

#ifdef CONFIG_INLINE_READ_LOCK_BH
#define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_LOCK_BH
#define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
#endif

#ifdef CONFIG_INLINE_READ_LOCK_IRQ
#define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
#define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
#endif

#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
#define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
#define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
#endif

#ifdef CONFIG_INLINE_READ_TRYLOCK
#define _raw_read_trylock(lock) __raw_read_trylock(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_TRYLOCK
#define _raw_write_trylock(lock) __raw_write_trylock(lock)
#endif

#ifdef CONFIG_INLINE_READ_UNLOCK
#define _raw_read_unlock(lock) __raw_read_unlock(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_UNLOCK
#define _raw_write_unlock(lock) __raw_write_unlock(lock)
#endif

#ifdef CONFIG_INLINE_READ_UNLOCK_BH
#define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
#define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
#endif

#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
#define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
#endif

#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
#define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
#endif

#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
#define _raw_read_unlock_irqrestore(lock, flags) \
	__raw_read_unlock_irqrestore(lock, flags)
#endif

#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
#define _raw_write_unlock_irqrestore(lock, flags) \
	__raw_write_unlock_irqrestore(lock, flags)
#endif

static inline int __raw_read_trylock(rwlock_t *lock)
{
	preempt_disable();
	if (do_raw_read_trylock(lock)) {
		rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

static inline int __raw_write_trylock(rwlock_t *lock)
{
	preempt_disable();
	if (do_raw_write_trylock(lock)) {
		rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
		return 1;
	}
	preempt_enable();
	return 0;
}

/*
 * If lockdep is enabled then we use the non-preemption spin-ops
 * even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
 * not re-enabled during lock-acquire (which the preempt-spin-ops do):
 */
#if !defined(CONFIG_GENERIC_LOCKBREAK) || defined(CONFIG_DEBUG_LOCK_ALLOC)

static inline void __raw_read_lock(rwlock_t *lock)
{
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
}

static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED_FLAGS(lock, do_raw_read_trylock, do_raw_read_lock,
			     do_raw_read_lock_flags, &flags);
	return flags;
}

static inline void __raw_read_lock_irq(rwlock_t *lock)
{
	local_irq_disable();
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
}

static inline void __raw_read_lock_bh(rwlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
}

static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
{
	unsigned long flags;

	local_irq_save(flags);
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED_FLAGS(lock, do_raw_write_trylock, do_raw_write_lock,
			     do_raw_write_lock_flags, &flags);
	return flags;
}

static inline void __raw_write_lock_irq(rwlock_t *lock)
{
	local_irq_disable();
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
}

static inline void __raw_write_lock_bh(rwlock_t *lock)
{
	local_bh_disable();
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
}

static inline void __raw_write_lock(rwlock_t *lock)
{
	preempt_disable();
	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
}

#endif /* CONFIG_PREEMPT */

static inline void __raw_write_unlock(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_write_unlock(lock);
	preempt_enable();
}

static inline void __raw_read_unlock(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_read_unlock(lock);
	preempt_enable();
}

static inline void
__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_read_unlock(lock);
	local_irq_restore(flags);
	preempt_enable();
}

static inline void __raw_read_unlock_irq(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_read_unlock(lock);
	local_irq_enable();
	preempt_enable();
}

static inline void __raw_read_unlock_bh(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_read_unlock(lock);
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}

static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
					     unsigned long flags)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_write_unlock(lock);
	local_irq_restore(flags);
	preempt_enable();
}

static inline void __raw_write_unlock_irq(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_write_unlock(lock);
	local_irq_enable();
	preempt_enable();
}

static inline void __raw_write_unlock_bh(rwlock_t *lock)
{
	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	do_raw_write_unlock(lock);
	preempt_enable_no_resched();
	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
}

#endif /* __LINUX_RWLOCK_API_SMP_H */
Commit	Line	Data
	1	#ifndef __LINUX_RWLOCK_API_SMP_H
	2	#define __LINUX_RWLOCK_API_SMP_H
	3
	4	#ifndef __LINUX_SPINLOCK_API_SMP_H
	5	# error "please don't include this file directly"
	6	#endif
	7
	8	/*
	9	* include/linux/rwlock_api_smp.h
	10	*
	11	* spinlock API declarations on SMP (and debug)
	12	* (implemented in kernel/spinlock.c)
	13	*
	14	* portions Copyright 2005, Red Hat, Inc., Ingo Molnar
	15	* Released under the General Public License (GPL).
	16	*/
	17
	18	void __lockfunc _raw_read_lock(rwlock_t *lock) __acquires(lock);
	19	void __lockfunc _raw_write_lock(rwlock_t *lock) __acquires(lock);
	20	void __lockfunc _raw_read_lock_bh(rwlock_t *lock) __acquires(lock);
	21	void __lockfunc _raw_write_lock_bh(rwlock_t *lock) __acquires(lock);
	22	void __lockfunc _raw_read_lock_irq(rwlock_t *lock) __acquires(lock);
	23	void __lockfunc _raw_write_lock_irq(rwlock_t *lock) __acquires(lock);
	24	unsigned long __lockfunc _raw_read_lock_irqsave(rwlock_t *lock)
	25	__acquires(lock);
	26	unsigned long __lockfunc _raw_write_lock_irqsave(rwlock_t *lock)
	27	__acquires(lock);
	28	int __lockfunc _raw_read_trylock(rwlock_t *lock);
	29	int __lockfunc _raw_write_trylock(rwlock_t *lock);
	30	void __lockfunc _raw_read_unlock(rwlock_t *lock) __releases(lock);
	31	void __lockfunc _raw_write_unlock(rwlock_t *lock) __releases(lock);
	32	void __lockfunc _raw_read_unlock_bh(rwlock_t *lock) __releases(lock);
	33	void __lockfunc _raw_write_unlock_bh(rwlock_t *lock) __releases(lock);
	34	void __lockfunc _raw_read_unlock_irq(rwlock_t *lock) __releases(lock);
	35	void __lockfunc _raw_write_unlock_irq(rwlock_t *lock) __releases(lock);
	36	void __lockfunc
	37	_raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
	38	__releases(lock);
	39	void __lockfunc
	40	_raw_write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
	41	__releases(lock);
	42
	43	#ifdef CONFIG_INLINE_READ_LOCK
	44	#define _raw_read_lock(lock) __raw_read_lock(lock)
	45	#endif
	46
	47	#ifdef CONFIG_INLINE_WRITE_LOCK
	48	#define _raw_write_lock(lock) __raw_write_lock(lock)
	49	#endif
	50
	51	#ifdef CONFIG_INLINE_READ_LOCK_BH
	52	#define _raw_read_lock_bh(lock) __raw_read_lock_bh(lock)
	53	#endif
	54
	55	#ifdef CONFIG_INLINE_WRITE_LOCK_BH
	56	#define _raw_write_lock_bh(lock) __raw_write_lock_bh(lock)
	57	#endif
	58
	59	#ifdef CONFIG_INLINE_READ_LOCK_IRQ
	60	#define _raw_read_lock_irq(lock) __raw_read_lock_irq(lock)
	61	#endif
	62
	63	#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
	64	#define _raw_write_lock_irq(lock) __raw_write_lock_irq(lock)
	65	#endif
	66
	67	#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
	68	#define _raw_read_lock_irqsave(lock) __raw_read_lock_irqsave(lock)
	69	#endif
	70
	71	#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
	72	#define _raw_write_lock_irqsave(lock) __raw_write_lock_irqsave(lock)
	73	#endif
	74
	75	#ifdef CONFIG_INLINE_READ_TRYLOCK
	76	#define _raw_read_trylock(lock) __raw_read_trylock(lock)
	77	#endif
	78
	79	#ifdef CONFIG_INLINE_WRITE_TRYLOCK
	80	#define _raw_write_trylock(lock) __raw_write_trylock(lock)
	81	#endif
	82
	83	#ifdef CONFIG_INLINE_READ_UNLOCK
	84	#define _raw_read_unlock(lock) __raw_read_unlock(lock)
	85	#endif
	86
	87	#ifdef CONFIG_INLINE_WRITE_UNLOCK
	88	#define _raw_write_unlock(lock) __raw_write_unlock(lock)
	89	#endif
	90
	91	#ifdef CONFIG_INLINE_READ_UNLOCK_BH
	92	#define _raw_read_unlock_bh(lock) __raw_read_unlock_bh(lock)
	93	#endif
	94
	95	#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
	96	#define _raw_write_unlock_bh(lock) __raw_write_unlock_bh(lock)
	97	#endif
	98
	99	#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
	100	#define _raw_read_unlock_irq(lock) __raw_read_unlock_irq(lock)
	101	#endif
	102
	103	#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
	104	#define _raw_write_unlock_irq(lock) __raw_write_unlock_irq(lock)
	105	#endif
	106
	107	#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
	108	#define _raw_read_unlock_irqrestore(lock, flags) \
	109	__raw_read_unlock_irqrestore(lock, flags)
	110	#endif
	111
	112	#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
	113	#define _raw_write_unlock_irqrestore(lock, flags) \
	114	__raw_write_unlock_irqrestore(lock, flags)
	115	#endif
	116
	117	static inline int __raw_read_trylock(rwlock_t *lock)
	118	{
	119	preempt_disable();
	120	if (do_raw_read_trylock(lock)) {
	121	rwlock_acquire_read(&lock->dep_map, 0, 1, _RET_IP_);
	122	return 1;
	123	}
	124	preempt_enable();
	125	return 0;
	126	}
	127
	128	static inline int __raw_write_trylock(rwlock_t *lock)
	129	{
	130	preempt_disable();
	131	if (do_raw_write_trylock(lock)) {
	132	rwlock_acquire(&lock->dep_map, 0, 1, _RET_IP_);
	133	return 1;
	134	}
	135	preempt_enable();
	136	return 0;
	137	}
	138
	139	/*
	140	* If lockdep is enabled then we use the non-preemption spin-ops
	141	* even on CONFIG_PREEMPT, because lockdep assumes that interrupts are
	142	* not re-enabled during lock-acquire (which the preempt-spin-ops do):
	143	*/
	144	#if !defined(CONFIG_GENERIC_LOCKBREAK) \|\| defined(CONFIG_DEBUG_LOCK_ALLOC)
	145
	146	static inline void __raw_read_lock(rwlock_t *lock)
	147	{
	148	preempt_disable();
	149	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	150	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
	151	}
	152
	153	static inline unsigned long __raw_read_lock_irqsave(rwlock_t *lock)
	154	{
	155	unsigned long flags;
	156
	157	local_irq_save(flags);
	158	preempt_disable();
	159	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	160	LOCK_CONTENDED_FLAGS(lock, do_raw_read_trylock, do_raw_read_lock,
	161	do_raw_read_lock_flags, &flags);
	162	return flags;
	163	}
	164
	165	static inline void __raw_read_lock_irq(rwlock_t *lock)
	166	{
	167	local_irq_disable();
	168	preempt_disable();
	169	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	170	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
	171	}
	172
	173	static inline void __raw_read_lock_bh(rwlock_t *lock)
	174	{
	175	local_bh_disable();
	176	preempt_disable();
	177	rwlock_acquire_read(&lock->dep_map, 0, 0, _RET_IP_);
	178	LOCK_CONTENDED(lock, do_raw_read_trylock, do_raw_read_lock);
	179	}
	180
	181	static inline unsigned long __raw_write_lock_irqsave(rwlock_t *lock)
	182	{
	183	unsigned long flags;
	184
	185	local_irq_save(flags);
	186	preempt_disable();
	187	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	188	LOCK_CONTENDED_FLAGS(lock, do_raw_write_trylock, do_raw_write_lock,
	189	do_raw_write_lock_flags, &flags);
	190	return flags;
	191	}
	192
	193	static inline void __raw_write_lock_irq(rwlock_t *lock)
	194	{
	195	local_irq_disable();
	196	preempt_disable();
	197	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	198	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
	199	}
	200
	201	static inline void __raw_write_lock_bh(rwlock_t *lock)
	202	{
	203	local_bh_disable();
	204	preempt_disable();
	205	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	206	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
	207	}
	208
	209	static inline void __raw_write_lock(rwlock_t *lock)
	210	{
	211	preempt_disable();
	212	rwlock_acquire(&lock->dep_map, 0, 0, _RET_IP_);
	213	LOCK_CONTENDED(lock, do_raw_write_trylock, do_raw_write_lock);
	214	}
	215
	216	#endif /* CONFIG_PREEMPT */
	217
	218	static inline void __raw_write_unlock(rwlock_t *lock)
	219	{
	220	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	221	do_raw_write_unlock(lock);
	222	preempt_enable();
	223	}
	224
	225	static inline void __raw_read_unlock(rwlock_t *lock)
	226	{
	227	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	228	do_raw_read_unlock(lock);
	229	preempt_enable();
	230	}
	231
	232	static inline void
	233	__raw_read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
	234	{
	235	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	236	do_raw_read_unlock(lock);
	237	local_irq_restore(flags);
	238	preempt_enable();
	239	}
	240
	241	static inline void __raw_read_unlock_irq(rwlock_t *lock)
	242	{
	243	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	244	do_raw_read_unlock(lock);
	245	local_irq_enable();
	246	preempt_enable();
	247	}
	248
	249	static inline void __raw_read_unlock_bh(rwlock_t *lock)
	250	{
	251	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	252	do_raw_read_unlock(lock);
	253	preempt_enable_no_resched();
	254	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
	255	}
	256
	257	static inline void __raw_write_unlock_irqrestore(rwlock_t *lock,
	258	unsigned long flags)
	259	{
	260	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	261	do_raw_write_unlock(lock);
	262	local_irq_restore(flags);
	263	preempt_enable();
	264	}
	265
	266	static inline void __raw_write_unlock_irq(rwlock_t *lock)
	267	{
	268	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	269	do_raw_write_unlock(lock);
	270	local_irq_enable();
	271	preempt_enable();
	272	}
	273
	274	static inline void __raw_write_unlock_bh(rwlock_t *lock)
	275	{
	276	rwlock_release(&lock->dep_map, 1, _RET_IP_);
	277	do_raw_write_unlock(lock);
	278	preempt_enable_no_resched();
	279	local_bh_enable_ip((unsigned long)__builtin_return_address(0));
	280	}
	281
	282	#endif /* __LINUX_RWLOCK_API_SMP_H */