[deliverable/linux.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/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 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)

#ifdef CONFIG_GENERIC_LOCKBREAK
#define spin_is_contended(lock) ((lock)->break_lock)
#else
#define spin_is_contended(lock)	__raw_spin_is_contended(&(lock)->raw_lock)
#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)
#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)	flags = _spin_lock_irqsave(lock)
#define read_lock_irqsave(lock, flags)	flags = _read_lock_irqsave(lock)
#define write_lock_irqsave(lock, flags)	flags = _write_lock_irqsave(lock)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define spin_lock_irqsave_nested(lock, flags, subclass) \
	flags = _spin_lock_irqsave_nested(lock, subclass)
#else
#define spin_lock_irqsave_nested(lock, flags, subclass) \
	flags = _spin_lock_irqsave(lock)
#endif

#else

#define spin_lock_irqsave(lock, flags)	_spin_lock_irqsave(lock, flags)
#define read_lock_irqsave(lock, flags)	_read_lock_irqsave(lock, flags)
#define write_lock_irqsave(lock, flags)	_write_lock_irqsave(lock, flags)
#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) \
					_spin_unlock_irqrestore(lock, flags)
#define spin_unlock_bh(lock)		_spin_unlock_bh(lock)

#define read_unlock_irqrestore(lock, flags) \
					_read_unlock_irqrestore(lock, flags)
#define read_unlock_bh(lock)		_read_unlock_bh(lock)

#define write_unlock_irqrestore(lock, flags) \
					_write_unlock_irqrestore(lock, flags)
#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; }); \
})

/*
 * Locks two spinlocks l1 and l2.
 * l1_first indicates if spinlock l1 should be taken first.
 */
static inline void double_spin_lock(spinlock_t *l1, spinlock_t *l2,
				    bool l1_first)
	__acquires(l1)
	__acquires(l2)
{
	if (l1_first) {
		spin_lock(l1);
		spin_lock(l2);
	} else {
		spin_lock(l2);
		spin_lock(l1);
	}
}

/*
 * Unlocks two spinlocks l1 and l2.
 * l1_taken_first indicates if spinlock l1 was taken first and therefore
 * should be released after spinlock l2.
 */
static inline void double_spin_unlock(spinlock_t *l1, spinlock_t *l2,
				      bool l1_taken_first)
	__releases(l1)
	__releases(l2)
{
	if (l1_taken_first) {
		spin_unlock(l2);
		spin_unlock(l1);
	} else {
		spin_unlock(l1);
		spin_unlock(l2);
	}
}

/*
 * 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>
676dcb8b	55	#include <linux/bottom_half.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
95c354fe NP	123	#ifdef CONFIG_GENERIC_LOCKBREAK
	124	#define spin_is_contended(lock) ((lock)->break_lock)
	125	#else
	126	#define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock)
	127	#endif
	128
fb1c8f93 IM	129	/**
	130	* spin_unlock_wait - wait until the spinlock gets unlocked
	131	* @lock: the spinlock in question.
	132	*/
	133	#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
	134
1da177e4	135	/*
fb1c8f93	136	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
1da177e4	137	*/
fb1c8f93 IM	138	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
fb1c8f93 IM	139	# include <linux/spinlock_api_smp.h>
1da177e4	140	#else
fb1c8f93	141	# include <linux/spinlock_api_up.h>
1da177e4 LT	142	#endif
1da177e4 LT	143
fb1c8f93 IM	144	#ifdef CONFIG_DEBUG_SPINLOCK
	145	extern void _raw_spin_lock(spinlock_t *lock);
	146	#define _raw_spin_lock_flags(lock, flags) _raw_spin_lock(lock)
	147	extern int _raw_spin_trylock(spinlock_t *lock);
	148	extern void _raw_spin_unlock(spinlock_t *lock);
fb1c8f93 IM	149	extern void _raw_read_lock(rwlock_t *lock);
	150	extern int _raw_read_trylock(rwlock_t *lock);
	151	extern void _raw_read_unlock(rwlock_t *lock);
	152	extern void _raw_write_lock(rwlock_t *lock);
	153	extern int _raw_write_trylock(rwlock_t *lock);
	154	extern void _raw_write_unlock(rwlock_t *lock);
	155	#else
fb1c8f93 IM	156	# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
	157	# define _raw_spin_lock_flags(lock, flags) \
	158	__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
8a25d5de IM	159	# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
8a25d5de IM	160	# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
fb1c8f93	161	# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
fb1c8f93	162	# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
8a25d5de IM	163	# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
8a25d5de IM	164	# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
fb1c8f93	165	# define _raw_write_trylock(rwlock) __raw_write_trylock(&(rwlock)->raw_lock)
8a25d5de	166	# define _raw_write_unlock(rwlock) __raw_write_unlock(&(rwlock)->raw_lock)
fb1c8f93	167	#endif
1da177e4	168
fb1c8f93 IM	169	#define read_can_lock(rwlock) __raw_read_can_lock(&(rwlock)->raw_lock)
fb1c8f93 IM	170	#define write_can_lock(rwlock) __raw_write_can_lock(&(rwlock)->raw_lock)
1da177e4 LT	171
	172	/*
	173	* Define the various spin_lock and rw_lock methods. Note we define these
	174	* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
	175	* methods are defined as nops in the case they are not required.
	176	*/
dcc8e559 JT	177	#define spin_trylock(lock) __cond_lock(lock, _spin_trylock(lock))
	178	#define read_trylock(lock) __cond_lock(lock, _read_trylock(lock))
	179	#define write_trylock(lock) __cond_lock(lock, _write_trylock(lock))
1da177e4	180
fb1c8f93	181	#define spin_lock(lock) _spin_lock(lock)
8a25d5de IM	182
	183	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	184	# define spin_lock_nested(lock, subclass) _spin_lock_nested(lock, subclass)
	185	#else
	186	# define spin_lock_nested(lock, subclass) _spin_lock(lock)
	187	#endif
	188
fb1c8f93 IM	189	#define write_lock(lock) _write_lock(lock)
fb1c8f93 IM	190	#define read_lock(lock) _read_lock(lock)
1da177e4	191
fb1c8f93	192	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
b8e6ec86 LT	193
	194	#define spin_lock_irqsave(lock, flags) flags = _spin_lock_irqsave(lock)
	195	#define read_lock_irqsave(lock, flags) flags = _read_lock_irqsave(lock)
	196	#define write_lock_irqsave(lock, flags) flags = _write_lock_irqsave(lock)
cfd3ef23 AV	197
cfd3ef23 AV	198	#ifdef CONFIG_DEBUG_LOCK_ALLOC
b8e6ec86 LT	199	#define spin_lock_irqsave_nested(lock, flags, subclass) \
b8e6ec86 LT	200	flags = _spin_lock_irqsave_nested(lock, subclass)
cfd3ef23	201	#else
b8e6ec86 LT	202	#define spin_lock_irqsave_nested(lock, flags, subclass) \
b8e6ec86 LT	203	flags = _spin_lock_irqsave(lock)
cfd3ef23 AV	204	#endif
cfd3ef23 AV	205
1da177e4	206	#else
b8e6ec86 LT	207
	208	#define spin_lock_irqsave(lock, flags) _spin_lock_irqsave(lock, flags)
	209	#define read_lock_irqsave(lock, flags) _read_lock_irqsave(lock, flags)
	210	#define write_lock_irqsave(lock, flags) _write_lock_irqsave(lock, flags)
cfd3ef23 AV	211	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	212	spin_lock_irqsave(lock, flags)
	213
1da177e4 LT	214	#endif
	215
	216	#define spin_lock_irq(lock) _spin_lock_irq(lock)
	217	#define spin_lock_bh(lock) _spin_lock_bh(lock)
	218
	219	#define read_lock_irq(lock) _read_lock_irq(lock)
	220	#define read_lock_bh(lock) _read_lock_bh(lock)
	221
	222	#define write_lock_irq(lock) _write_lock_irq(lock)
	223	#define write_lock_bh(lock) _write_lock_bh(lock)
	224
bda98685 IM	225	/*
	226	* We inline the unlock functions in the nondebug case:
	227	*/
8a25d5de IM	228	#if defined(CONFIG_DEBUG_SPINLOCK) \|\| defined(CONFIG_PREEMPT) \|\| \
8a25d5de IM	229	!defined(CONFIG_SMP)
bda98685 IM	230	# define spin_unlock(lock) _spin_unlock(lock)
	231	# define read_unlock(lock) _read_unlock(lock)
	232	# define write_unlock(lock) _write_unlock(lock)
bda98685 IM	233	# define spin_unlock_irq(lock) _spin_unlock_irq(lock)
	234	# define read_unlock_irq(lock) _read_unlock_irq(lock)
	235	# define write_unlock_irq(lock) _write_unlock_irq(lock)
	236	#else
c75fb88d PR	237	# define spin_unlock(lock) \
	238	do {__raw_spin_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	239	# define read_unlock(lock) \
	240	do {__raw_read_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	241	# define write_unlock(lock) \
	242	do {__raw_write_unlock(&(lock)->raw_lock); __release(lock); } while (0)
	243	# define spin_unlock_irq(lock) \
	244	do { \
	245	__raw_spin_unlock(&(lock)->raw_lock); \
	246	__release(lock); \
	247	local_irq_enable(); \
	248	} while (0)
	249	# define read_unlock_irq(lock) \
	250	do { \
	251	__raw_read_unlock(&(lock)->raw_lock); \
	252	__release(lock); \
	253	local_irq_enable(); \
	254	} while (0)
	255	# define write_unlock_irq(lock) \
	256	do { \
	257	__raw_write_unlock(&(lock)->raw_lock); \
	258	__release(lock); \
	259	local_irq_enable(); \
	260	} while (0)
bda98685	261	#endif
1da177e4	262
fb1c8f93	263	#define spin_unlock_irqrestore(lock, flags) \
b8e6ec86	264	_spin_unlock_irqrestore(lock, flags)
1da177e4 LT	265	#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
1da177e4 LT	266
fb1c8f93	267	#define read_unlock_irqrestore(lock, flags) \
b8e6ec86	268	_read_unlock_irqrestore(lock, flags)
fb1c8f93	269	#define read_unlock_bh(lock) _read_unlock_bh(lock)
1da177e4	270
fb1c8f93	271	#define write_unlock_irqrestore(lock, flags) \
b8e6ec86	272	_write_unlock_irqrestore(lock, flags)
fb1c8f93	273	#define write_unlock_bh(lock) _write_unlock_bh(lock)
1da177e4	274
dcc8e559	275	#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
1da177e4 LT	276
	277	#define spin_trylock_irq(lock) \
	278	({ \
	279	local_irq_disable(); \
303912e2	280	spin_trylock(lock) ? \
fb1c8f93	281	1 : ({ local_irq_enable(); 0; }); \
1da177e4 LT	282	})
	283
	284	#define spin_trylock_irqsave(lock, flags) \
	285	({ \
	286	local_irq_save(flags); \
303912e2	287	spin_trylock(lock) ? \
fb1c8f93	288	1 : ({ local_irq_restore(flags); 0; }); \
1da177e4 LT	289	})
1da177e4 LT	290
e1f4a88c SS	291	#define write_trylock_irqsave(lock, flags) \
	292	({ \
	293	local_irq_save(flags); \
	294	write_trylock(lock) ? \
	295	1 : ({ local_irq_restore(flags); 0; }); \
	296	})
	297
e81ce1f7 HC	298	/*
	299	* Locks two spinlocks l1 and l2.
	300	* l1_first indicates if spinlock l1 should be taken first.
	301	*/
	302	static inline void double_spin_lock(spinlock_t l1, spinlock_t l2,
	303	bool l1_first)
	304	__acquires(l1)
	305	__acquires(l2)
	306	{
	307	if (l1_first) {
	308	spin_lock(l1);
	309	spin_lock(l2);
	310	} else {
	311	spin_lock(l2);
	312	spin_lock(l1);
	313	}
	314	}
	315
	316	/*
	317	* Unlocks two spinlocks l1 and l2.
	318	* l1_taken_first indicates if spinlock l1 was taken first and therefore
	319	* should be released after spinlock l2.
	320	*/
	321	static inline void double_spin_unlock(spinlock_t l1, spinlock_t l2,
	322	bool l1_taken_first)
	323	__releases(l1)
	324	__releases(l2)
	325	{
	326	if (l1_taken_first) {
	327	spin_unlock(l2);
	328	spin_unlock(l1);
	329	} else {
	330	spin_unlock(l1);
	331	spin_unlock(l2);
	332	}
	333	}
	334
1da177e4	335	/*
fb1c8f93 IM	336	* Pull the atomic_t declaration:
fb1c8f93 IM	337	* (asm-mips/atomic.h needs above definitions)
1da177e4	338	*/
fb1c8f93 IM	339	#include <asm/atomic.h>
	340	/**
	341	* atomic_dec_and_lock - lock on reaching reference count zero
	342	* @atomic: the atomic counter
	343	* @lock: the spinlock in question
1da177e4	344	*/
fb1c8f93 IM	345	extern int _atomic_dec_and_lock(atomic_t atomic, spinlock_t lock);
fb1c8f93 IM	346	#define atomic_dec_and_lock(atomic, lock) \
dcc8e559	347	__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
1da177e4 LT	348
	349	/**
	350	* spin_can_lock - would spin_trylock() succeed?
	351	* @lock: the spinlock in question.
	352	*/
fb1c8f93	353	#define spin_can_lock(lock) (!spin_is_locked(lock))
1da177e4 LT	354
1da177e4 LT	355	#endif /* __LINUX_SPINLOCK_H */