[mirror_ubuntu-bionic-kernel.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>

/*
 * 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(lock); } 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(lock); } 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

/* The lock does not imply full memory barrier. */
#ifndef ARCH_HAS_SMP_MB_AFTER_LOCK
static inline void smp_mb__after_lock(void) { smp_mb(); }
#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)

#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);
#define _raw_read_lock_flags(lock, flags) _raw_read_lock(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);
#define _raw_write_lock_flags(lock, flags) _raw_write_lock(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_lock_flags(lock, flags) \
		__raw_read_lock_flags(&(lock)->raw_lock, *(flags))
# 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_lock_flags(lock, flags) \
		__raw_write_lock_flags(&(lock)->raw_lock, *(flags))
# 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)
#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)

#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))

/*
 * 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

#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
1da177e4	82	/*
fb1c8f93	83	* Pull the __raw*() functions/declarations (UP-nondebug doesnt need them):
1da177e4	84	*/
8a25d5de	85	#ifdef CONFIG_SMP
fb1c8f93	86	# include <asm/spinlock.h>
1da177e4	87	#else
fb1c8f93	88	# include <linux/spinlock_up.h>
1da177e4 LT	89	#endif
1da177e4 LT	90
8a25d5de IM	91	#ifdef CONFIG_DEBUG_SPINLOCK
	92	extern void __spin_lock_init(spinlock_t lock, const char name,
	93	struct lock_class_key *key);
	94	# define spin_lock_init(lock) \
	95	do { \
	96	static struct lock_class_key __key; \
	97	\
	98	__spin_lock_init((lock), #lock, &__key); \
	99	} while (0)
	100
	101	#else
	102	# define spin_lock_init(lock) \
a49ed0bf	103	do { *(lock) = __SPIN_LOCK_UNLOCKED(lock); } while (0)
8a25d5de IM	104	#endif
	105
	106	#ifdef CONFIG_DEBUG_SPINLOCK
	107	extern void __rwlock_init(rwlock_t lock, const char name,
	108	struct lock_class_key *key);
	109	# define rwlock_init(lock) \
	110	do { \
	111	static struct lock_class_key __key; \
	112	\
	113	__rwlock_init((lock), #lock, &__key); \
	114	} while (0)
	115	#else
	116	# define rwlock_init(lock) \
a49ed0bf	117	do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
8a25d5de	118	#endif
fb1c8f93 IM	119
	120	#define spin_is_locked(lock) __raw_spin_is_locked(&(lock)->raw_lock)
	121
95c354fe NP	122	#ifdef CONFIG_GENERIC_LOCKBREAK
	123	#define spin_is_contended(lock) ((lock)->break_lock)
	124	#else
a5ef7ca0 KM	125
a5ef7ca0 KM	126	#ifdef __raw_spin_is_contended
95c354fe	127	#define spin_is_contended(lock) __raw_spin_is_contended(&(lock)->raw_lock)
a5ef7ca0 KM	128	#else
	129	#define spin_is_contended(lock) (((void)(lock), 0))
	130	#endif /__raw_spin_is_contended/
95c354fe NP	131	#endif
95c354fe NP	132
ad462769 JO	133	/* The lock does not imply full memory barrier. */
	134	#ifndef ARCH_HAS_SMP_MB_AFTER_LOCK
	135	static inline void smp_mb__after_lock(void) { smp_mb(); }
	136	#endif
	137
fb1c8f93 IM	138	/**
	139	* spin_unlock_wait - wait until the spinlock gets unlocked
	140	* @lock: the spinlock in question.
	141	*/
	142	#define spin_unlock_wait(lock) __raw_spin_unlock_wait(&(lock)->raw_lock)
	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	149	extern void _raw_read_lock(rwlock_t *lock);
f5f7eac4	150	#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
fb1c8f93 IM	151	extern int _raw_read_trylock(rwlock_t *lock);
	152	extern void _raw_read_unlock(rwlock_t *lock);
	153	extern void _raw_write_lock(rwlock_t *lock);
f5f7eac4	154	#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
fb1c8f93 IM	155	extern int _raw_write_trylock(rwlock_t *lock);
	156	extern void _raw_write_unlock(rwlock_t *lock);
	157	#else
fb1c8f93 IM	158	# define _raw_spin_lock(lock) __raw_spin_lock(&(lock)->raw_lock)
	159	# define _raw_spin_lock_flags(lock, flags) \
	160	__raw_spin_lock_flags(&(lock)->raw_lock, *(flags))
8a25d5de IM	161	# define _raw_spin_trylock(lock) __raw_spin_trylock(&(lock)->raw_lock)
8a25d5de IM	162	# define _raw_spin_unlock(lock) __raw_spin_unlock(&(lock)->raw_lock)
fb1c8f93	163	# define _raw_read_lock(rwlock) __raw_read_lock(&(rwlock)->raw_lock)
f5f7eac4 RH	164	# define _raw_read_lock_flags(lock, flags) \
f5f7eac4 RH	165	__raw_read_lock_flags(&(lock)->raw_lock, *(flags))
fb1c8f93	166	# define _raw_read_trylock(rwlock) __raw_read_trylock(&(rwlock)->raw_lock)
8a25d5de IM	167	# define _raw_read_unlock(rwlock) __raw_read_unlock(&(rwlock)->raw_lock)
8a25d5de IM	168	# define _raw_write_lock(rwlock) __raw_write_lock(&(rwlock)->raw_lock)
f5f7eac4 RH	169	# define _raw_write_lock_flags(lock, flags) \
f5f7eac4 RH	170	__raw_write_lock_flags(&(lock)->raw_lock, *(flags))
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)
1da177e4 LT	260	#define read_lock_irq(lock) _read_lock_irq(lock)
1da177e4 LT	261	#define read_lock_bh(lock) _read_lock_bh(lock)
1da177e4 LT	262	#define write_lock_irq(lock) _write_lock_irq(lock)
1da177e4 LT	263	#define write_lock_bh(lock) _write_lock_bh(lock)
bb7bed08 HC	264	#define spin_unlock(lock) _spin_unlock(lock)
	265	#define read_unlock(lock) _read_unlock(lock)
	266	#define write_unlock(lock) _write_unlock(lock)
	267	#define spin_unlock_irq(lock) _spin_unlock_irq(lock)
	268	#define read_unlock_irq(lock) _read_unlock_irq(lock)
	269	#define write_unlock_irq(lock) _write_unlock_irq(lock)
1da177e4	270
3f307891 SR	271	#define spin_unlock_irqrestore(lock, flags) \
	272	do { \
	273	typecheck(unsigned long, flags); \
	274	_spin_unlock_irqrestore(lock, flags); \
	275	} while (0)
1da177e4 LT	276	#define spin_unlock_bh(lock) _spin_unlock_bh(lock)
1da177e4 LT	277
3f307891 SR	278	#define read_unlock_irqrestore(lock, flags) \
	279	do { \
	280	typecheck(unsigned long, flags); \
	281	_read_unlock_irqrestore(lock, flags); \
	282	} while (0)
fb1c8f93	283	#define read_unlock_bh(lock) _read_unlock_bh(lock)
1da177e4	284
3f307891 SR	285	#define write_unlock_irqrestore(lock, flags) \
	286	do { \
	287	typecheck(unsigned long, flags); \
	288	_write_unlock_irqrestore(lock, flags); \
	289	} while (0)
fb1c8f93	290	#define write_unlock_bh(lock) _write_unlock_bh(lock)
1da177e4	291
dcc8e559	292	#define spin_trylock_bh(lock) __cond_lock(lock, _spin_trylock_bh(lock))
1da177e4 LT	293
	294	#define spin_trylock_irq(lock) \
	295	({ \
	296	local_irq_disable(); \
303912e2	297	spin_trylock(lock) ? \
fb1c8f93	298	1 : ({ local_irq_enable(); 0; }); \
1da177e4 LT	299	})
	300
	301	#define spin_trylock_irqsave(lock, flags) \
	302	({ \
	303	local_irq_save(flags); \
303912e2	304	spin_trylock(lock) ? \
fb1c8f93	305	1 : ({ local_irq_restore(flags); 0; }); \
1da177e4 LT	306	})
1da177e4 LT	307
e1f4a88c SS	308	#define write_trylock_irqsave(lock, flags) \
	309	({ \
	310	local_irq_save(flags); \
	311	write_trylock(lock) ? \
	312	1 : ({ local_irq_restore(flags); 0; }); \
	313	})
	314
1da177e4	315	/*
fb1c8f93 IM	316	* Pull the atomic_t declaration:
fb1c8f93 IM	317	* (asm-mips/atomic.h needs above definitions)
1da177e4	318	*/
fb1c8f93 IM	319	#include <asm/atomic.h>
	320	/**
	321	* atomic_dec_and_lock - lock on reaching reference count zero
	322	* @atomic: the atomic counter
	323	* @lock: the spinlock in question
dc07e721 BF	324	*
	325	* Decrements @atomic by 1. If the result is 0, returns true and locks
	326	* @lock. Returns false for all other cases.
1da177e4	327	*/
fb1c8f93 IM	328	extern int _atomic_dec_and_lock(atomic_t atomic, spinlock_t lock);
fb1c8f93 IM	329	#define atomic_dec_and_lock(atomic, lock) \
dcc8e559	330	__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
1da177e4 LT	331
	332	/**
	333	* spin_can_lock - would spin_trylock() succeed?
	334	* @lock: the spinlock in question.
	335	*/
fb1c8f93	336	#define spin_can_lock(lock) (!spin_is_locked(lock))
1da177e4	337
69d0ee73 HC	338	/*
	339	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
	340	*/
	341	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
	342	# include <linux/spinlock_api_smp.h>
	343	#else
	344	# include <linux/spinlock_api_up.h>
	345	#endif
	346
1da177e4	347	#endif /* __LINUX_SPINLOCK_H */