[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/typecheck.h>
#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/bottom_half.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 __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)

#ifdef CONFIG_GENERIC_LOCKBREAK
#define spin_is_contended(lock) ((lock)->break_lock)
#else

#ifdef __raw_spin_is_contended
#define spin_is_contended(lock)	__raw_spin_is_contended(&(lock)->raw_lock)
#else
#define spin_is_contended(lock)	(((void)(lock), 0))
#endif /*__raw_spin_is_contended*/
#endif

/**
 * 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)
# define spin_lock_nest_lock(lock, nest_lock)				\
	 do {								\
		 typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
		 _spin_lock_nest_lock(lock, &(nest_lock)->dep_map);	\
	 } while (0)
#else
# define spin_lock_nested(lock, subclass) _spin_lock(lock)
# define spin_lock_nest_lock(lock, nest_lock) _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 {						\
		typecheck(unsigned long, flags);	\
		flags = _spin_lock_irqsave(lock);	\
	} while (0)
#define read_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		flags = _read_lock_irqsave(lock);	\
	} while (0)
#define write_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		flags = _write_lock_irqsave(lock);	\
	} while (0)

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

#else

#define spin_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		_spin_lock_irqsave(lock, flags);	\
	} while (0)
#define read_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		_read_lock_irqsave(lock, flags);	\
	} while (0)
#define write_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, 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) \
    do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define read_unlock(lock) \
    do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define write_unlock(lock) \
    do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
# define spin_unlock_irq(lock)			\
do {						\
	__raw_spin_unlock(&(lock)->raw_lock);	\
	__release(lock);			\
	local_irq_enable();			\
} while (0)
# define read_unlock_irq(lock)			\
do {						\
	__raw_read_unlock(&(lock)->raw_lock);	\
	__release(lock);			\
	local_irq_enable();			\
} while (0)
# define write_unlock_irq(lock)			\
do {						\
	__raw_write_unlock(&(lock)->raw_lock);	\
	__release(lock);			\
	local_irq_enable();			\
} while (0)
#endif

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

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

#define write_unlock_irqrestore(lock, flags)		\
	do {						\
		typecheck(unsigned long, 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) \
({ \
	local_irq_save(flags); \
	spin_trylock(lock) ? \
	1 : ({ local_irq_restore(flags); 0; }); \
})

#define write_trylock_irqsave(lock, flags) \
({ \
	local_irq_save(flags); \
	write_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
 *
 * Decrements @atomic by 1.  If the result is 0, returns true and locks
 * @lock.  Returns false for all other cases.
 */
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
3f307891	49	#include <linux/typecheck.h>
1da177e4 LT	50	#include <linux/preempt.h>
	51	#include <linux/linkage.h>
	52	#include <linux/compiler.h>
	53	#include <linux/thread_info.h>
	54	#include <linux/kernel.h>
	55	#include <linux/stringify.h>
676dcb8b	56	#include <linux/bottom_half.h>
1da177e4	57
1da177e4 LT	58	#include <asm/system.h>
	59
	60	/*
	61	* Must define these before including other files, inline functions need them
	62	*/
f83b5e32	63	#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME
1da177e4 LT	64
	65	#define LOCK_SECTION_START(extra) \
	66	".subsection 1\n\t" \
	67	extra \
	68	".ifndef " LOCK_SECTION_NAME "\n\t" \
	69	LOCK_SECTION_NAME ":\n\t" \
	70	".endif\n"
	71
	72	#define LOCK_SECTION_END \
	73	".previous\n\t"
	74
ec701584	75	#define __lockfunc __attribute__((section(".spinlock.text")))
1da177e4 LT	76
1da177e4 LT	77	/*
fb1c8f93	78	* Pull the raw_spinlock_t and raw_rwlock_t definitions:
1da177e4	79	*/
fb1c8f93	80	#include <linux/spinlock_types.h>
1da177e4	81
fb1c8f93	82	extern int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock);
1da177e4	83
1da177e4	84	/*
fb1c8f93	85	* Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
1da177e4	86	*/
8a25d5de	87	#ifdef CONFIG_SMP
fb1c8f93	88	# include <asm/spinlock.h>
1da177e4	89	#else
fb1c8f93	90	# include <linux/spinlock_up.h>
1da177e4 LT	91	#endif
1da177e4 LT	92
8a25d5de IM	93	#ifdef CONFIG_DEBUG_SPINLOCK
	94	extern void __spin_lock_init(spinlock_t lock, const char name,
	95	struct lock_class_key *key);
	96	# define spin_lock_init(lock) \
	97	do { \
	98	static struct lock_class_key __key; \
	99	\
	100	__spin_lock_init((lock), #lock, &__key); \
	101	} while (0)
	102
	103	#else
	104	# define spin_lock_init(lock) \
	105	do { *(lock) = SPIN_LOCK_UNLOCKED; } while (0)
	106	#endif
	107
	108	#ifdef CONFIG_DEBUG_SPINLOCK
	109	extern void __rwlock_init(rwlock_t lock, const char name,
	110	struct lock_class_key *key);
	111	# define rwlock_init(lock) \
	112	do { \
	113	static struct lock_class_key __key; \
	114	\
	115	__rwlock_init((lock), #lock, &__key); \
	116	} while (0)
	117	#else
	118	# define rwlock_init(lock) \
	119	do { *(lock) = RW_LOCK_UNLOCKED; } while (0)
	120	#endif
fb1c8f93 IM	121
	122	#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
	123
95c354fe NP	124	#ifdef CONFIG_GENERIC_LOCKBREAK
	125	#define spin_is_contended(lock) ((lock)->break_lock)
	126	#else
a5ef7ca0 KM	127
a5ef7ca0 KM	128	#ifdef __raw_spin_is_contended
95c354fe	129	#define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock)
a5ef7ca0 KM	130	#else
	131	#define spin_is_contended(lock) (((void)(lock), 0))
	132	#endif /__raw_spin_is_contended/
95c354fe NP	133	#endif
95c354fe NP	134
fb1c8f93 IM	135	/**
	136	* spin_unlock_wait - wait until the spinlock gets unlocked
	137	* @lock: the spinlock in question.
	138	*/
	139	#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
	140
1da177e4	141	/*
fb1c8f93	142	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
1da177e4	143	*/
fb1c8f93 IM	144	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
fb1c8f93 IM	145	# include <linux/spinlock_api_smp.h>
1da177e4	146	#else
fb1c8f93	147	# include <linux/spinlock_api_up.h>
1da177e4 LT	148	#endif
1da177e4 LT	149
fb1c8f93 IM	150	#ifdef CONFIG_DEBUG_SPINLOCK
	151	extern void _raw_spin_lock(spinlock_t *lock);
	152	#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
	153	extern int _raw_spin_trylock(spinlock_t *lock);
	154	extern void _raw_spin_unlock(spinlock_t *lock);
fb1c8f93 IM	155	extern void _raw_read_lock(rwlock_t *lock);
	156	extern int _raw_read_trylock(rwlock_t *lock);
	157	extern void _raw_read_unlock(rwlock_t *lock);
	158	extern void _raw_write_lock(rwlock_t *lock);
	159	extern int _raw_write_trylock(rwlock_t *lock);
	160	extern void _raw_write_unlock(rwlock_t *lock);
	161	#else
fb1c8f93 IM	162	# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
	163	# define _raw_spin_lock_flags(lock, flags) \
	164	__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
8a25d5de IM	165	# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
8a25d5de IM	166	# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
fb1c8f93	167	# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
fb1c8f93	168	# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
8a25d5de IM	169	# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
8a25d5de IM	170	# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
fb1c8f93	171	# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
8a25d5de	172	# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
fb1c8f93	173	#endif
1da177e4	174
fb1c8f93 IM	175	#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
fb1c8f93 IM	176	#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
1da177e4 LT	177
	178	/*
	179	* Define the various spin_lock and rw_lock methods. Note we define these
	180	* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
	181	* methods are defined as nops in the case they are not required.
	182	*/
dcc8e559 JT	183	#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
	184	#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
	185	#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
1da177e4	186
fb1c8f93	187	#define spin_lock(lock) _spin_lock(lock)
8a25d5de IM	188
	189	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	190	# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
b7d39aff PZ	191	# define spin_lock_nest_lock(lock, nest_lock) \
	192	do { \
	193	typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
	194	_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
	195	} while (0)
8a25d5de IM	196	#else
8a25d5de IM	197	# define spin_lock_nested(lock, subclass) _spin_lock(lock)
b7d39aff	198	# define spin_lock_nest_lock(lock, nest_lock) _spin_lock(lock)
8a25d5de IM	199	#endif
8a25d5de IM	200
fb1c8f93 IM	201	#define write_lock(lock) _write_lock(lock)
fb1c8f93 IM	202	#define read_lock(lock) _read_lock(lock)
1da177e4	203
fb1c8f93	204	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
b8e6ec86	205
3f307891 SR	206	#define spin_lock_irqsave(lock, flags) \
	207	do { \
	208	typecheck(unsigned long, flags); \
	209	flags = _spin_lock_irqsave(lock); \
	210	} while (0)
	211	#define read_lock_irqsave(lock, flags) \
	212	do { \
	213	typecheck(unsigned long, flags); \
	214	flags = _read_lock_irqsave(lock); \
	215	} while (0)
	216	#define write_lock_irqsave(lock, flags) \
	217	do { \
	218	typecheck(unsigned long, flags); \
	219	flags = _write_lock_irqsave(lock); \
	220	} while (0)
cfd3ef23 AV	221
cfd3ef23 AV	222	#ifdef CONFIG_DEBUG_LOCK_ALLOC
3f307891 SR	223	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	224	do { \
	225	typecheck(unsigned long, flags); \
	226	flags = _spin_lock_irqsave_nested(lock, subclass); \
	227	} while (0)
cfd3ef23	228	#else
3f307891 SR	229	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	230	do { \
	231	typecheck(unsigned long, flags); \
	232	flags = _spin_lock_irqsave(lock); \
	233	} while (0)
cfd3ef23 AV	234	#endif
cfd3ef23 AV	235
1da177e4	236	#else
b8e6ec86	237
3f307891 SR	238	#define spin_lock_irqsave(lock, flags) \
	239	do { \
	240	typecheck(unsigned long, flags); \
	241	_spin_lock_irqsave(lock, flags); \
	242	} while (0)
	243	#define read_lock_irqsave(lock, flags) \
	244	do { \
	245	typecheck(unsigned long, flags); \
	246	_read_lock_irqsave(lock, flags); \
	247	} while (0)
	248	#define write_lock_irqsave(lock, flags) \
	249	do { \
	250	typecheck(unsigned long, flags); \
	251	_write_lock_irqsave(lock, flags); \
	252	} while (0)
cfd3ef23 AV	253	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	254	spin_lock_irqsave(lock, flags)
	255
1da177e4 LT	256	#endif
	257
	258	#define spin_lock_irq(lock) _spin_lock_irq(lock)
	259	#define spin_lock_bh(lock) _spin_lock_bh(lock)
	260
	261	#define read_lock_irq(lock) _read_lock_irq(lock)
	262	#define read_lock_bh(lock) _read_lock_bh(lock)
	263
	264	#define write_lock_irq(lock) _write_lock_irq(lock)
	265	#define write_lock_bh(lock) _write_lock_bh(lock)
	266
bda98685 IM	267	/*
	268	* We inline the unlock functions in the nondebug case:
	269	*/
8a25d5de IM	270	#if defined(CONFIG_DEBUG_SPINLOCK) \|\| defined(CONFIG_PREEMPT) \|\| \
8a25d5de IM	271	!defined(CONFIG_SMP)
bda98685 IM	272	# define spin_unlock(lock) _spin_unlock(lock)
	273	# define read_unlock(lock) _read_unlock(lock)
	274	# define write_unlock(lock) _write_unlock(lock)
bda98685 IM	275	# define spin_unlock_irq(lock) _spin_unlock_irq(lock)
	276	# define read_unlock_irq(lock) _read_unlock_irq(lock)
	277	# define write_unlock_irq(lock) _write_unlock_irq(lock)
	278	#else
c75fb88d PR	279	# define spin_unlock(lock) \
	280	do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	281	# define read_unlock(lock) \
	282	do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	283	# define write_unlock(lock) \
	284	do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	285	# define spin_unlock_irq(lock) \
	286	do { \
	287	__raw_spin_unlock(&(lock)->raw_lock); \
	288	__release(lock); \
	289	local_irq_enable(); \
	290	} while (0)
	291	# define read_unlock_irq(lock) \
	292	do { \
	293	__raw_read_unlock(&(lock)->raw_lock); \
	294	__release(lock); \
	295	local_irq_enable(); \
	296	} while (0)
	297	# define write_unlock_irq(lock) \
	298	do { \
	299	__raw_write_unlock(&(lock)->raw_lock); \
	300	__release(lock); \
	301	local_irq_enable(); \
	302	} while (0)
bda98685	303	#endif
1da177e4	304
3f307891 SR	305	#define spin_unlock_irqrestore(lock, flags) \
	306	do { \
	307	typecheck(unsigned long, flags); \
	308	_spin_unlock_irqrestore(lock, flags); \
	309	} while (0)
1da177e4 LT	310	#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
1da177e4 LT	311
3f307891 SR	312	#define read_unlock_irqrestore(lock, flags) \
	313	do { \
	314	typecheck(unsigned long, flags); \
	315	_read_unlock_irqrestore(lock, flags); \
	316	} while (0)
fb1c8f93	317	#define read_unlock_bh(lock) _read_unlock_bh(lock)
1da177e4	318
3f307891 SR	319	#define write_unlock_irqrestore(lock, flags) \
	320	do { \
	321	typecheck(unsigned long, flags); \
	322	_write_unlock_irqrestore(lock, flags); \
	323	} while (0)
fb1c8f93	324	#define write_unlock_bh(lock) _write_unlock_bh(lock)
1da177e4	325
dcc8e559	326	#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
1da177e4 LT	327
	328	#define spin_trylock_irq(lock) \
	329	({ \
	330	local_irq_disable(); \
303912e2	331	spin_trylock(lock) ? \
fb1c8f93	332	1 : ({ local_irq_enable(); 0; }); \
1da177e4 LT	333	})
	334
	335	#define spin_trylock_irqsave(lock, flags) \
	336	({ \
	337	local_irq_save(flags); \
303912e2	338	spin_trylock(lock) ? \
fb1c8f93	339	1 : ({ local_irq_restore(flags); 0; }); \
1da177e4 LT	340	})
1da177e4 LT	341
e1f4a88c SS	342	#define write_trylock_irqsave(lock, flags) \
	343	({ \
	344	local_irq_save(flags); \
	345	write_trylock(lock) ? \
	346	1 : ({ local_irq_restore(flags); 0; }); \
	347	})
	348
1da177e4	349	/*
fb1c8f93 IM	350	* Pull the atomic_t declaration:
fb1c8f93 IM	351	* (asm-mips/atomic.h needs above definitions)
1da177e4	352	*/
fb1c8f93 IM	353	#include <asm/atomic.h>
	354	/**
	355	* atomic_dec_and_lock - lock on reaching reference count zero
	356	* @atomic: the atomic counter
	357	* @lock: the spinlock in question
dc07e721 BF	358	*
	359	* Decrements @atomic by 1. If the result is 0, returns true and locks
	360	* @lock. Returns false for all other cases.
1da177e4	361	*/
fb1c8f93 IM	362	extern int _atomic_dec_and_lock(atomic_t atomic, spinlock_t lock);
fb1c8f93 IM	363	#define atomic_dec_and_lock(atomic, lock) \
dcc8e559	364	__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
1da177e4 LT	365
	366	/**
	367	* spin_can_lock - would spin_trylock() succeed?
	368	* @lock: the spinlock in question.
	369	*/
fb1c8f93	370	#define spin_can_lock(lock) (!spin_is_locked(lock))
1da177e4 LT	371
1da177e4 LT	372	#endif /* __LINUX_SPINLOCK_H */