[net-next-2.6.git] / include / linux / spinlock.h

#ifndef __LINUX_SPINLOCK_H
#define __LINUX_SPINLOCK_H

/*
 * include/linux/spinlock.h - generic spinlock/rwlock declarations
 *
 * here's the role of the various spinlock/rwlock related include files:
 *
 * on SMP builds:
 *
 *  asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
 *                        initializers
 *
 *  linux/spinlock_types.h:
 *                        defines the generic type and initializers
 *
 *  asm/spinlock.h:       contains the __raw_spin_*()/etc. lowlevel
 *                        implementations, mostly inline assembly code
 *
 *   (also included on UP-debug builds:)
 *
 *  linux/spinlock_api_smp.h:
 *                        contains the prototypes for the _spin_*() APIs.
 *
 *  linux/spinlock.h:     builds the final spin_*() APIs.
 *
 * on UP builds:
 *
 *  linux/spinlock_type_up.h:
 *                        contains the generic, simplified UP spinlock type.
 *                        (which is an empty structure on non-debug builds)
 *
 *  linux/spinlock_types.h:
 *                        defines the generic type and initializers
 *
 *  linux/spinlock_up.h:
 *                        contains the __raw_spin_*()/etc. version of UP
 *                        builds. (which are NOPs on non-debug, non-preempt
 *                        builds)
 *
 *   (included on UP-non-debug builds:)
 *
 *  linux/spinlock_api_up.h:
 *                        builds the _spin_*() APIs.
 *
 *  linux/spinlock.h:     builds the final spin_*() APIs.
 */

#include <linux/preempt.h>
#include <linux/linkage.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
#include <linux/kernel.h>
#include <linux/stringify.h>
#include <linux/irqflags.h>

#include <asm/system.h>

/*
 * Must define these before including other files, inline functions need them
 */
#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME

#define LOCK_SECTION_START(extra)               \
        ".subsection 1\n\t"                     \
        extra                                   \
        ".ifndef " LOCK_SECTION_NAME "\n\t"     \
        LOCK_SECTION_NAME ":\n\t"               \
        ".endif\n"

#define LOCK_SECTION_END                        \
        ".previous\n\t"

#define __lockfunc fastcall __attribute__((section(".spinlock.text")))

/*
 * Pull the raw_spinlock_t and raw_rwlock_t definitions:
 */
#include <linux/spinlock_types.h>

extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);

/*
 * Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
 */
#ifdef CONFIG_SMP
# include <asm/spinlock.h>
#else
# include <linux/spinlock_up.h>
#endif

#ifdef CONFIG_DEBUG_SPINLOCK
  extern void __spin_lock_init(spinlock_t *lock, const char *name,
			       struct lock_class_key *key);
# define spin_lock_init(lock)					\
do {								\
	static struct lock_class_key __key;			\
								\
	__spin_lock_init((lock), #lock, &__key);		\
} while (0)

#else
# define spin_lock_init(lock)					\
	do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
#endif

#ifdef CONFIG_DEBUG_SPINLOCK
  extern void __rwlock_init(rwlock_t *lock, const char *name,
			    struct lock_class_key *key);
# define rwlock_init(lock)					\
do {								\
	static struct lock_class_key __key;			\
								\
	__rwlock_init((lock), #lock, &__key);			\
} while (0)
#else
# define rwlock_init(lock)					\
	do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
#endif

#define spin_is_locked(lock)	__raw_spin_is_locked(&(lock)->raw_lock)

/**
 * spin_unlock_wait - wait until the spinlock gets unlocked
 * @lock: the spinlock in question.
 */
#define spin_unlock_wait(lock)	__raw_spin_unlock_wait(&(lock)->raw_lock)

/*
 * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
 */
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
# include <linux/spinlock_api_smp.h>
#else
# include <linux/spinlock_api_up.h>
#endif

#ifdef CONFIG_DEBUG_SPINLOCK
 extern void _raw_spin_lock(spinlock_t *lock);
#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
 extern int _raw_spin_trylock(spinlock_t *lock);
 extern void _raw_spin_unlock(spinlock_t *lock);
 extern void _raw_read_lock(rwlock_t *lock);
 extern int _raw_read_trylock(rwlock_t *lock);
 extern void _raw_read_unlock(rwlock_t *lock);
 extern void _raw_write_lock(rwlock_t *lock);
 extern int _raw_write_trylock(rwlock_t *lock);
 extern void _raw_write_unlock(rwlock_t *lock);
#else
# define _raw_spin_lock(lock)		__raw_spin_lock(&(lock)->raw_lock)
# define _raw_spin_lock_flags(lock, flags) \
		__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
# define _raw_spin_trylock(lock)	__raw_spin_trylock(&(lock)->raw_lock)
# define _raw_spin_unlock(lock)		__raw_spin_unlock(&(lock)->raw_lock)
# define _raw_read_lock(rwlock)		__raw_read_lock(&(rwlock)->raw_lock)
# define _raw_read_trylock(rwlock)	__raw_read_trylock(&(rwlock)->raw_lock)
# define _raw_read_unlock(rwlock)	__raw_read_unlock(&(rwlock)->raw_lock)
# define _raw_write_lock(rwlock)	__raw_write_lock(&(rwlock)->raw_lock)
# define _raw_write_trylock(rwlock)	__raw_write_trylock(&(rwlock)->raw_lock)
# define _raw_write_unlock(rwlock)	__raw_write_unlock(&(rwlock)->raw_lock)
#endif

#define read_can_lock(rwlock)		__raw_read_can_lock(&(rwlock)->raw_lock)
#define write_can_lock(rwlock)		__raw_write_can_lock(&(rwlock)->raw_lock)

/*
 * Define the various spin_lock and rw_lock methods.  Note we define these
 * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
 * methods are defined as nops in the case they are not required.
 */
#define spin_trylock(lock)		__cond_lock(lock, _spin_trylock(lock))
#define read_trylock(lock)		__cond_lock(lock, _read_trylock(lock))
#define write_trylock(lock)		__cond_lock(lock, _write_trylock(lock))

#define spin_lock(lock)			_spin_lock(lock)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
#else
# define spin_lock_nested(lock, subclass) _spin_lock(lock)
#endif

#define write_lock(lock)		_write_lock(lock)
#define read_lock(lock)			_read_lock(lock)

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
#define spin_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		flags = _spin_lock_irqsave(lock);	\
	} while (0)
#define read_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		flags = _read_lock_irqsave(lock);	\
	} while (0)
#define write_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		flags = _write_lock_irqsave(lock);	\
	} while (0)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define spin_lock_irqsave_nested(lock, flags, subclass)			\
	do {								\
		BUILD_CHECK_IRQ_FLAGS(flags);				\
		flags = _spin_lock_irqsave_nested(lock, subclass);	\
	} while (0)
#else
#define spin_lock_irqsave_nested(lock, flags, subclass)			\
	do {								\
		BUILD_CHECK_IRQ_FLAGS(flags);				\
		flags = _spin_lock_irqsave(lock);			\
	} while (0)
#endif

#else
#define spin_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_spin_lock_irqsave(lock, flags);	\
	} while (0)
#define read_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_read_lock_irqsave(lock, flags);	\
	} while (0)
#define write_lock_irqsave(lock, flags)			\
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_write_lock_irqsave(lock, flags);	\
	} while (0)
#define spin_lock_irqsave_nested(lock, flags, subclass)	\
	spin_lock_irqsave(lock, flags)

#endif

#define spin_lock_irq(lock)		_spin_lock_irq(lock)
#define spin_lock_bh(lock)		_spin_lock_bh(lock)

#define read_lock_irq(lock)		_read_lock_irq(lock)
#define read_lock_bh(lock)		_read_lock_bh(lock)

#define write_lock_irq(lock)		_write_lock_irq(lock)
#define write_lock_bh(lock)		_write_lock_bh(lock)

/*
 * We inline the unlock functions in the nondebug case:
 */
#if defined(CONFIG_DEBUG_SPINLOCK) || defined(CONFIG_PREEMPT) || \
	!defined(CONFIG_SMP)
# define spin_unlock(lock)		_spin_unlock(lock)
# define read_unlock(lock)		_read_unlock(lock)
# define write_unlock(lock)		_write_unlock(lock)
# define spin_unlock_irq(lock)		_spin_unlock_irq(lock)
# define read_unlock_irq(lock)		_read_unlock_irq(lock)
# define write_unlock_irq(lock)		_write_unlock_irq(lock)
#else
# define spin_unlock(lock)		__raw_spin_unlock(&(lock)->raw_lock)
# define read_unlock(lock)		__raw_read_unlock(&(lock)->raw_lock)
# define write_unlock(lock)		__raw_write_unlock(&(lock)->raw_lock)
# define spin_unlock_irq(lock) \
    do { __raw_spin_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
# define read_unlock_irq(lock) \
    do { __raw_read_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
# define write_unlock_irq(lock) \
    do { __raw_write_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
#endif

#define spin_unlock_irqrestore(lock, flags) \
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_spin_unlock_irqrestore(lock, flags);	\
	} while (0)
#define spin_unlock_bh(lock)		_spin_unlock_bh(lock)

#define read_unlock_irqrestore(lock, flags) \
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_read_unlock_irqrestore(lock, flags);	\
	} while (0)
#define read_unlock_bh(lock)		_read_unlock_bh(lock)

#define write_unlock_irqrestore(lock, flags) \
	do {						\
		BUILD_CHECK_IRQ_FLAGS(flags);		\
		_write_unlock_irqrestore(lock, flags);	\
	} while (0)
#define write_unlock_bh(lock)		_write_unlock_bh(lock)

#define spin_trylock_bh(lock)	__cond_lock(lock, _spin_trylock_bh(lock))

#define spin_trylock_irq(lock) \
({ \
	local_irq_disable(); \
	spin_trylock(lock) ? \
	1 : ({ local_irq_enable(); 0;  }); \
})

#define spin_trylock_irqsave(lock, flags) \
({ \
	BUILD_CHECK_IRQ_FLAGS(flags); \
	local_irq_save(flags); \
	spin_trylock(lock) ? \
	1 : ({ local_irq_restore(flags); 0; }); \
})

/*
 * Pull the atomic_t declaration:
 * (asm-mips/atomic.h needs above definitions)
 */
#include <asm/atomic.h>
/**
 * atomic_dec_and_lock - lock on reaching reference count zero
 * @atomic: the atomic counter
 * @lock: the spinlock in question
 */
extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
#define atomic_dec_and_lock(atomic, lock) \
		__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))

/**
 * spin_can_lock - would spin_trylock() succeed?
 * @lock: the spinlock in question.
 */
#define spin_can_lock(lock)	(!spin_is_locked(lock))

#endif /* __LINUX_SPINLOCK_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_SPINLOCK_H
	2	#define __LINUX_SPINLOCK_H
	3
	4	/*
fb1c8f93 IM	5	* include/linux/spinlock.h - generic spinlock/rwlock declarations
	6	*
	7	* here's the role of the various spinlock/rwlock related include files:
	8	*
	9	* on SMP builds:
	10	*
	11	* asm/spinlock_types.h: contains the raw_spinlock_t/raw_rwlock_t and the
	12	* initializers
	13	*
	14	* linux/spinlock_types.h:
	15	* defines the generic type and initializers
	16	*
	17	* asm/spinlock.h: contains the __raw_spin_*()/etc. lowlevel
	18	* implementations, mostly inline assembly code
	19	*
	20	* (also included on UP-debug builds:)
	21	*
	22	* linux/spinlock_api_smp.h:
	23	* contains the prototypes for the _spin_*() APIs.
	24	*
	25	* linux/spinlock.h: builds the final spin_*() APIs.
	26	*
	27	* on UP builds:
	28	*
	29	* linux/spinlock_type_up.h:
	30	* contains the generic, simplified UP spinlock type.
	31	* (which is an empty structure on non-debug builds)
	32	*
	33	* linux/spinlock_types.h:
	34	* defines the generic type and initializers
	35	*
	36	* linux/spinlock_up.h:
	37	* contains the __raw_spin_*()/etc. version of UP
	38	* builds. (which are NOPs on non-debug, non-preempt
	39	* builds)
	40	*
	41	* (included on UP-non-debug builds:)
	42	*
	43	* linux/spinlock_api_up.h:
	44	* builds the _spin_*() APIs.
	45	*
	46	* linux/spinlock.h: builds the final spin_*() APIs.
1da177e4 LT	47	*/
1da177e4 LT	48
1da177e4 LT	49	#include <linux/preempt.h>
	50	#include <linux/linkage.h>
	51	#include <linux/compiler.h>
	52	#include <linux/thread_info.h>
	53	#include <linux/kernel.h>
	54	#include <linux/stringify.h>
ee3ce191	55	#include <linux/irqflags.h>
1da177e4	56
1da177e4 LT	57	#include <asm/system.h>
	58
	59	/*
	60	* Must define these before including other files, inline functions need them
	61	*/
f83b5e32	62	#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME
1da177e4 LT	63
	64	#define LOCK_SECTION_START(extra) \
	65	".subsection 1\n\t" \
	66	extra \
	67	".ifndef " LOCK_SECTION_NAME "\n\t" \
	68	LOCK_SECTION_NAME ":\n\t" \
	69	".endif\n"
	70
	71	#define LOCK_SECTION_END \
	72	".previous\n\t"
	73
	74	#define __lockfunc fastcall __attribute__((section(".spinlock.text")))
	75
	76	/*
fb1c8f93	77	* Pull the raw_spinlock_t and raw_rwlock_t definitions:
1da177e4	78	*/
fb1c8f93	79	#include <linux/spinlock_types.h>
1da177e4	80
fb1c8f93	81	extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
1da177e4	82
1da177e4	83	/*
fb1c8f93	84	* Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
1da177e4	85	*/
8a25d5de	86	#ifdef CONFIG_SMP
fb1c8f93	87	# include <asm/spinlock.h>
1da177e4	88	#else
fb1c8f93	89	# include <linux/spinlock_up.h>
1da177e4 LT	90	#endif
1da177e4 LT	91
8a25d5de IM	92	#ifdef CONFIG_DEBUG_SPINLOCK
	93	extern void __spin_lock_init(spinlock_t lock, const char name,
	94	struct lock_class_key *key);
	95	# define spin_lock_init(lock) \
	96	do { \
	97	static struct lock_class_key __key; \
	98	\
	99	__spin_lock_init((lock), #lock, &__key); \
	100	} while (0)
	101
	102	#else
	103	# define spin_lock_init(lock) \
	104	do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
	105	#endif
	106
	107	#ifdef CONFIG_DEBUG_SPINLOCK
	108	extern void __rwlock_init(rwlock_t lock, const char name,
	109	struct lock_class_key *key);
	110	# define rwlock_init(lock) \
	111	do { \
	112	static struct lock_class_key __key; \
	113	\
	114	__rwlock_init((lock), #lock, &__key); \
	115	} while (0)
	116	#else
	117	# define rwlock_init(lock) \
	118	do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
	119	#endif
fb1c8f93 IM	120
	121	#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
	122
	123	/**
	124	* spin_unlock_wait - wait until the spinlock gets unlocked
	125	* @lock: the spinlock in question.
	126	*/
	127	#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
	128
1da177e4	129	/*
fb1c8f93	130	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
1da177e4	131	*/
fb1c8f93 IM	132	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
fb1c8f93 IM	133	# include <linux/spinlock_api_smp.h>
1da177e4	134	#else
fb1c8f93	135	# include <linux/spinlock_api_up.h>
1da177e4 LT	136	#endif
1da177e4 LT	137
fb1c8f93 IM	138	#ifdef CONFIG_DEBUG_SPINLOCK
	139	extern void _raw_spin_lock(spinlock_t *lock);
	140	#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
	141	extern int _raw_spin_trylock(spinlock_t *lock);
	142	extern void _raw_spin_unlock(spinlock_t *lock);
fb1c8f93 IM	143	extern void _raw_read_lock(rwlock_t *lock);
	144	extern int _raw_read_trylock(rwlock_t *lock);
	145	extern void _raw_read_unlock(rwlock_t *lock);
	146	extern void _raw_write_lock(rwlock_t *lock);
	147	extern int _raw_write_trylock(rwlock_t *lock);
	148	extern void _raw_write_unlock(rwlock_t *lock);
	149	#else
fb1c8f93 IM	150	# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
	151	# define _raw_spin_lock_flags(lock, flags) \
	152	__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
8a25d5de IM	153	# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
8a25d5de IM	154	# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
fb1c8f93	155	# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
fb1c8f93	156	# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
8a25d5de IM	157	# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
8a25d5de IM	158	# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
fb1c8f93	159	# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
8a25d5de	160	# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
fb1c8f93	161	#endif
1da177e4	162
fb1c8f93 IM	163	#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
fb1c8f93 IM	164	#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
1da177e4 LT	165
	166	/*
	167	* Define the various spin_lock and rw_lock methods. Note we define these
	168	* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
	169	* methods are defined as nops in the case they are not required.
	170	*/
dcc8e559 JT	171	#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
	172	#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
	173	#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
1da177e4	174
fb1c8f93	175	#define spin_lock(lock) _spin_lock(lock)
8a25d5de IM	176
	177	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	178	# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
	179	#else
	180	# define spin_lock_nested(lock, subclass) _spin_lock(lock)
	181	#endif
	182
fb1c8f93 IM	183	#define write_lock(lock) _write_lock(lock)
fb1c8f93 IM	184	#define read_lock(lock) _read_lock(lock)
1da177e4	185
fb1c8f93	186	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
ee3ce191 AD	187	#define spin_lock_irqsave(lock, flags) \
	188	do { \
	189	BUILD_CHECK_IRQ_FLAGS(flags); \
	190	flags = _spin_lock_irqsave(lock); \
	191	} while (0)
	192	#define read_lock_irqsave(lock, flags) \
	193	do { \
	194	BUILD_CHECK_IRQ_FLAGS(flags); \
	195	flags = _read_lock_irqsave(lock); \
	196	} while (0)
	197	#define write_lock_irqsave(lock, flags) \
	198	do { \
	199	BUILD_CHECK_IRQ_FLAGS(flags); \
	200	flags = _write_lock_irqsave(lock); \
	201	} while (0)
cfd3ef23 AV	202
	203	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	204	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	205	do { \
	206	BUILD_CHECK_IRQ_FLAGS(flags); \
	207	flags = _spin_lock_irqsave_nested(lock, subclass); \
	208	} while (0)
	209	#else
	210	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	211	do { \
	212	BUILD_CHECK_IRQ_FLAGS(flags); \
	213	flags = _spin_lock_irqsave(lock); \
	214	} while (0)
	215	#endif
	216
1da177e4	217	#else
ee3ce191 AD	218	#define spin_lock_irqsave(lock, flags) \
	219	do { \
	220	BUILD_CHECK_IRQ_FLAGS(flags); \
	221	_spin_lock_irqsave(lock, flags); \
	222	} while (0)
	223	#define read_lock_irqsave(lock, flags) \
	224	do { \
	225	BUILD_CHECK_IRQ_FLAGS(flags); \
	226	_read_lock_irqsave(lock, flags); \
	227	} while (0)
	228	#define write_lock_irqsave(lock, flags) \
	229	do { \
	230	BUILD_CHECK_IRQ_FLAGS(flags); \
	231	_write_lock_irqsave(lock, flags); \
	232	} while (0)
cfd3ef23 AV	233	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	234	spin_lock_irqsave(lock, flags)
	235
1da177e4 LT	236	#endif
	237
	238	#define spin_lock_irq(lock) _spin_lock_irq(lock)
	239	#define spin_lock_bh(lock) _spin_lock_bh(lock)
	240
	241	#define read_lock_irq(lock) _read_lock_irq(lock)
	242	#define read_lock_bh(lock) _read_lock_bh(lock)
	243
	244	#define write_lock_irq(lock) _write_lock_irq(lock)
	245	#define write_lock_bh(lock) _write_lock_bh(lock)
	246
bda98685 IM	247	/*
	248	* We inline the unlock functions in the nondebug case:
	249	*/
8a25d5de IM	250	#if defined(CONFIG_DEBUG_SPINLOCK) \|\| defined(CONFIG_PREEMPT) \|\| \
8a25d5de IM	251	!defined(CONFIG_SMP)
bda98685 IM	252	# define spin_unlock(lock) _spin_unlock(lock)
	253	# define read_unlock(lock) _read_unlock(lock)
	254	# define write_unlock(lock) _write_unlock(lock)
bda98685 IM	255	# define spin_unlock_irq(lock) _spin_unlock_irq(lock)
	256	# define read_unlock_irq(lock) _read_unlock_irq(lock)
	257	# define write_unlock_irq(lock) _write_unlock_irq(lock)
	258	#else
8a25d5de IM	259	# define spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
	260	# define read_unlock(lock) __raw_read_unlock(&(lock)->raw_lock)
	261	# define write_unlock(lock) __raw_write_unlock(&(lock)->raw_lock)
bda98685 IM	262	# define spin_unlock_irq(lock) \
	263	do { __raw_spin_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
	264	# define read_unlock_irq(lock) \
	265	do { __raw_read_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
	266	# define write_unlock_irq(lock) \
	267	do { __raw_write_unlock(&(lock)->raw_lock); local_irq_enable(); } while (0)
	268	#endif
1da177e4	269
fb1c8f93	270	#define spin_unlock_irqrestore(lock, flags) \
ee3ce191 AD	271	do { \
	272	BUILD_CHECK_IRQ_FLAGS(flags); \
	273	_spin_unlock_irqrestore(lock, flags); \
	274	} while (0)
1da177e4 LT	275	#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
1da177e4 LT	276
fb1c8f93	277	#define read_unlock_irqrestore(lock, flags) \
ee3ce191 AD	278	do { \
	279	BUILD_CHECK_IRQ_FLAGS(flags); \
	280	_read_unlock_irqrestore(lock, flags); \
	281	} while (0)
fb1c8f93	282	#define read_unlock_bh(lock) _read_unlock_bh(lock)
1da177e4	283
fb1c8f93	284	#define write_unlock_irqrestore(lock, flags) \
ee3ce191 AD	285	do { \
	286	BUILD_CHECK_IRQ_FLAGS(flags); \
	287	_write_unlock_irqrestore(lock, flags); \
	288	} while (0)
fb1c8f93	289	#define write_unlock_bh(lock) _write_unlock_bh(lock)
1da177e4	290
dcc8e559	291	#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
1da177e4 LT	292
	293	#define spin_trylock_irq(lock) \
	294	({ \
	295	local_irq_disable(); \
303912e2	296	spin_trylock(lock) ? \
fb1c8f93	297	1 : ({ local_irq_enable(); 0; }); \
1da177e4 LT	298	})
	299
	300	#define spin_trylock_irqsave(lock, flags) \
	301	({ \
ee3ce191	302	BUILD_CHECK_IRQ_FLAGS(flags); \
1da177e4	303	local_irq_save(flags); \
303912e2	304	spin_trylock(lock) ? \
fb1c8f93	305	1 : ({ local_irq_restore(flags); 0; }); \
1da177e4 LT	306	})
1da177e4 LT	307
1da177e4	308	/*
fb1c8f93 IM	309	* Pull the atomic_t declaration:
fb1c8f93 IM	310	* (asm-mips/atomic.h needs above definitions)
1da177e4	311	*/
fb1c8f93 IM	312	#include <asm/atomic.h>
	313	/**
	314	* atomic_dec_and_lock - lock on reaching reference count zero
	315	* @atomic: the atomic counter
	316	* @lock: the spinlock in question
1da177e4	317	*/
fb1c8f93 IM	318	extern int _atomic_dec_and_lock(atomic_t atomic, spinlock_t lock);
fb1c8f93 IM	319	#define atomic_dec_and_lock(atomic, lock) \
dcc8e559	320	__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
1da177e4 LT	321
	322	/**
	323	* spin_can_lock - would spin_trylock() succeed?
	324	* @lock: the spinlock in question.
	325	*/
fb1c8f93	326	#define spin_can_lock(lock) (!spin_is_locked(lock))
1da177e4 LT	327
1da177e4 LT	328	#endif /* __LINUX_SPINLOCK_H */