[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / include / linux / spinlock.h

/* SPDX-License-Identifier: GPL-2.0 */
#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 arch_spinlock_t/arch_rwlock_t and the
 *                        initializers
 *
 *  linux/spinlock_types.h:
 *                        defines the generic type and initializers
 *
 *  asm/spinlock.h:       contains the arch_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 arch_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/irqflags.h>
#include <linux/thread_info.h>
#include <linux/kernel.h>
#include <linux/stringify.h>
#include <linux/bottom_half.h>
#include <asm/barrier.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 arch_spinlock_t and arch_rwlock_t definitions:
 */
#include <linux/spinlock_types.h>

/*
 * Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):
 */
#ifdef CONFIG_SMP
# include <asm/spinlock.h>
#else
# include <linux/spinlock_up.h>
#endif

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

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

#define raw_spin_is_locked(lock)	arch_spin_is_locked(&(lock)->raw_lock)

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

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

/*
 * This barrier must provide two things:
 *
 *   - it must guarantee a STORE before the spin_lock() is ordered against a
 *     LOAD after it, see the comments at its two usage sites.
 *
 *   - it must ensure the critical section is RCsc.
 *
 * The latter is important for cases where we observe values written by other
 * CPUs in spin-loops, without barriers, while being subject to scheduling.
 *
 * CPU0			CPU1			CPU2
 *
 *			for (;;) {
 *			  if (READ_ONCE(X))
 *			    break;
 *			}
 * X=1
 *			<sched-out>
 *						<sched-in>
 *						r = X;
 *
 * without transitivity it could be that CPU1 observes X!=0 breaks the loop,
 * we get migrated and CPU2 sees X==0.
 *
 * Since most load-store architectures implement ACQUIRE with an smp_mb() after
 * the LL/SC loop, they need no further barriers. Similarly all our TSO
 * architectures imply an smp_mb() for each atomic instruction and equally don't
 * need more.
 *
 * Architectures that can implement ACQUIRE better need to take care.
 */
#ifndef smp_mb__after_spinlock
#define smp_mb__after_spinlock()	do { } while (0)
#endif

#ifdef CONFIG_DEBUG_SPINLOCK
 extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock)
 extern int do_raw_spin_trylock(raw_spinlock_t *lock);
 extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
#else
static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)
{
	__acquire(lock);
	arch_spin_lock(&lock->raw_lock);
}

static inline void
do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock)
{
	__acquire(lock);
	arch_spin_lock_flags(&lock->raw_lock, *flags);
}

static inline int do_raw_spin_trylock(raw_spinlock_t *lock)
{
	return arch_spin_trylock(&(lock)->raw_lock);
}

static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
{
	arch_spin_unlock(&lock->raw_lock);
	__release(lock);
}
#endif

/*
 * Define the various spin_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 raw_spin_trylock(lock)	__cond_lock(lock, _raw_spin_trylock(lock))

#define raw_spin_lock(lock)	_raw_spin_lock(lock)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define raw_spin_lock_nested(lock, subclass) \
	_raw_spin_lock_nested(lock, subclass)

# define raw_spin_lock_nest_lock(lock, nest_lock)			\
	 do {								\
		 typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
		 _raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map);	\
	 } while (0)
#else
/*
 * Always evaluate the 'subclass' argument to avoid that the compiler
 * warns about set-but-not-used variables when building with
 * CONFIG_DEBUG_LOCK_ALLOC=n and with W=1.
 */
# define raw_spin_lock_nested(lock, subclass)		\
	_raw_spin_lock(((void)(subclass), (lock)))
# define raw_spin_lock_nest_lock(lock, nest_lock)	_raw_spin_lock(lock)
#endif

#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)

#define raw_spin_lock_irqsave(lock, flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		flags = _raw_spin_lock_irqsave(lock);	\
	} while (0)

#ifdef CONFIG_DEBUG_LOCK_ALLOC
#define raw_spin_lock_irqsave_nested(lock, flags, subclass)		\
	do {								\
		typecheck(unsigned long, flags);			\
		flags = _raw_spin_lock_irqsave_nested(lock, subclass);	\
	} while (0)
#else
#define raw_spin_lock_irqsave_nested(lock, flags, subclass)		\
	do {								\
		typecheck(unsigned long, flags);			\
		flags = _raw_spin_lock_irqsave(lock);			\
	} while (0)
#endif

#else

#define raw_spin_lock_irqsave(lock, flags)		\
	do {						\
		typecheck(unsigned long, flags);	\
		_raw_spin_lock_irqsave(lock, flags);	\
	} while (0)

#define raw_spin_lock_irqsave_nested(lock, flags, subclass)	\
	raw_spin_lock_irqsave(lock, flags)

#endif

#define raw_spin_lock_irq(lock)		_raw_spin_lock_irq(lock)
#define raw_spin_lock_bh(lock)		_raw_spin_lock_bh(lock)
#define raw_spin_unlock(lock)		_raw_spin_unlock(lock)
#define raw_spin_unlock_irq(lock)	_raw_spin_unlock_irq(lock)

#define raw_spin_unlock_irqrestore(lock, flags)		\
	do {							\
		typecheck(unsigned long, flags);		\
		_raw_spin_unlock_irqrestore(lock, flags);	\
	} while (0)
#define raw_spin_unlock_bh(lock)	_raw_spin_unlock_bh(lock)

#define raw_spin_trylock_bh(lock) \
	__cond_lock(lock, _raw_spin_trylock_bh(lock))

#define raw_spin_trylock_irq(lock) \
({ \
	local_irq_disable(); \
	raw_spin_trylock(lock) ? \
	1 : ({ local_irq_enable(); 0;  }); \
})

#define raw_spin_trylock_irqsave(lock, flags) \
({ \
	local_irq_save(flags); \
	raw_spin_trylock(lock) ? \
	1 : ({ local_irq_restore(flags); 0; }); \
})

/**
 * raw_spin_can_lock - would raw_spin_trylock() succeed?
 * @lock: the spinlock in question.
 */
#define raw_spin_can_lock(lock)	(!raw_spin_is_locked(lock))

/* Include rwlock functions */
#include <linux/rwlock.h>

/*
 * 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

/*
 * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
 */

static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
{
	return &lock->rlock;
}

#define spin_lock_init(_lock)				\
do {							\
	spinlock_check(_lock);				\
	raw_spin_lock_init(&(_lock)->rlock);		\
} while (0)

static __always_inline void spin_lock(spinlock_t *lock)
{
	raw_spin_lock(&lock->rlock);
}

static __always_inline void spin_lock_bh(spinlock_t *lock)
{
	raw_spin_lock_bh(&lock->rlock);
}

static __always_inline int spin_trylock(spinlock_t *lock)
{
	return raw_spin_trylock(&lock->rlock);
}

#define spin_lock_nested(lock, subclass)			\
do {								\
	raw_spin_lock_nested(spinlock_check(lock), subclass);	\
} while (0)

#define spin_lock_nest_lock(lock, nest_lock)				\
do {									\
	raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock);	\
} while (0)

static __always_inline void spin_lock_irq(spinlock_t *lock)
{
	raw_spin_lock_irq(&lock->rlock);
}

#define spin_lock_irqsave(lock, flags)				\
do {								\
	raw_spin_lock_irqsave(spinlock_check(lock), flags);	\
} while (0)

#define spin_lock_irqsave_nested(lock, flags, subclass)			\
do {									\
	raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
} while (0)

static __always_inline void spin_unlock(spinlock_t *lock)
{
	raw_spin_unlock(&lock->rlock);
}

static __always_inline void spin_unlock_bh(spinlock_t *lock)
{
	raw_spin_unlock_bh(&lock->rlock);
}

static __always_inline void spin_unlock_irq(spinlock_t *lock)
{
	raw_spin_unlock_irq(&lock->rlock);
}

static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
	raw_spin_unlock_irqrestore(&lock->rlock, flags);
}

static __always_inline int spin_trylock_bh(spinlock_t *lock)
{
	return raw_spin_trylock_bh(&lock->rlock);
}

static __always_inline int spin_trylock_irq(spinlock_t *lock)
{
	return raw_spin_trylock_irq(&lock->rlock);
}

#define spin_trylock_irqsave(lock, flags)			\
({								\
	raw_spin_trylock_irqsave(spinlock_check(lock), flags); \
})

static __always_inline int spin_is_locked(spinlock_t *lock)
{
	return raw_spin_is_locked(&lock->rlock);
}

static __always_inline int spin_is_contended(spinlock_t *lock)
{
	return raw_spin_is_contended(&lock->rlock);
}

static __always_inline int spin_can_lock(spinlock_t *lock)
{
	return raw_spin_can_lock(&lock->rlock);
}

#define assert_spin_locked(lock)	assert_raw_spin_locked(&(lock)->rlock)

/*
 * Pull the atomic_t declaration:
 * (asm-mips/atomic.h needs above definitions)
 */
#include <linux/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))

#endif /* __LINUX_SPINLOCK_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef __LINUX_SPINLOCK_H
	3	#define __LINUX_SPINLOCK_H
	4
	5	/*
	6	* include/linux/spinlock.h - generic spinlock/rwlock declarations
	7	*
	8	* here's the role of the various spinlock/rwlock related include files:
	9	*
	10	* on SMP builds:
	11	*
	12	* asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the
	13	* initializers
	14	*
	15	* linux/spinlock_types.h:
	16	* defines the generic type and initializers
	17	*
	18	* asm/spinlock.h: contains the arch_spin_*()/etc. lowlevel
	19	* implementations, mostly inline assembly code
	20	*
	21	* (also included on UP-debug builds:)
	22	*
	23	* linux/spinlock_api_smp.h:
	24	* contains the prototypes for the _spin_*() APIs.
	25	*
	26	* linux/spinlock.h: builds the final spin_*() APIs.
	27	*
	28	* on UP builds:
	29	*
	30	* linux/spinlock_type_up.h:
	31	* contains the generic, simplified UP spinlock type.
	32	* (which is an empty structure on non-debug builds)
	33	*
	34	* linux/spinlock_types.h:
	35	* defines the generic type and initializers
	36	*
	37	* linux/spinlock_up.h:
	38	* contains the arch_spin_*()/etc. version of UP
	39	* builds. (which are NOPs on non-debug, non-preempt
	40	* builds)
	41	*
	42	* (included on UP-non-debug builds:)
	43	*
	44	* linux/spinlock_api_up.h:
	45	* builds the _spin_*() APIs.
	46	*
	47	* linux/spinlock.h: builds the final spin_*() APIs.
	48	*/
	49
	50	#include <linux/typecheck.h>
	51	#include <linux/preempt.h>
	52	#include <linux/linkage.h>
	53	#include <linux/compiler.h>
	54	#include <linux/irqflags.h>
	55	#include <linux/thread_info.h>
	56	#include <linux/kernel.h>
	57	#include <linux/stringify.h>
	58	#include <linux/bottom_half.h>
	59	#include <asm/barrier.h>
	60
	61
	62	/*
	63	* Must define these before including other files, inline functions need them
	64	*/
	65	#define LOCK_SECTION_NAME ".text..lock."KBUILD_BASENAME
	66
	67	#define LOCK_SECTION_START(extra) \
	68	".subsection 1\n\t" \
	69	extra \
	70	".ifndef " LOCK_SECTION_NAME "\n\t" \
	71	LOCK_SECTION_NAME ":\n\t" \
	72	".endif\n"
	73
	74	#define LOCK_SECTION_END \
	75	".previous\n\t"
	76
	77	#define __lockfunc __attribute__((section(".spinlock.text")))
	78
	79	/*
	80	* Pull the arch_spinlock_t and arch_rwlock_t definitions:
	81	*/
	82	#include <linux/spinlock_types.h>
	83
	84	/*
	85	* Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):
	86	*/
	87	#ifdef CONFIG_SMP
	88	# include <asm/spinlock.h>
	89	#else
	90	# include <linux/spinlock_up.h>
	91	#endif
	92
	93	#ifdef CONFIG_DEBUG_SPINLOCK
	94	extern void __raw_spin_lock_init(raw_spinlock_t lock, const char name,
	95	struct lock_class_key *key);
	96	# define raw_spin_lock_init(lock) \
	97	do { \
	98	static struct lock_class_key __key; \
	99	\
	100	__raw_spin_lock_init((lock), #lock, &__key); \
	101	} while (0)
	102
	103	#else
	104	# define raw_spin_lock_init(lock) \
	105	do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0)
	106	#endif
	107
	108	#define raw_spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock)
	109
	110	#ifdef CONFIG_GENERIC_LOCKBREAK
	111	#define raw_spin_is_contended(lock) ((lock)->break_lock)
	112	#else
	113
	114	#ifdef arch_spin_is_contended
	115	#define raw_spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock)
	116	#else
	117	#define raw_spin_is_contended(lock) (((void)(lock), 0))
	118	#endif /arch_spin_is_contended/
	119	#endif
	120
	121	/*
	122	* This barrier must provide two things:
	123	*
	124	* - it must guarantee a STORE before the spin_lock() is ordered against a
	125	* LOAD after it, see the comments at its two usage sites.
	126	*
	127	* - it must ensure the critical section is RCsc.
	128	*
	129	* The latter is important for cases where we observe values written by other
	130	* CPUs in spin-loops, without barriers, while being subject to scheduling.
	131	*
	132	* CPU0 CPU1 CPU2
	133	*
	134	* for (;;) {
	135	* if (READ_ONCE(X))
	136	* break;
	137	* }
	138	* X=1
	139	* <sched-out>
	140	* <sched-in>
	141	* r = X;
	142	*
	143	* without transitivity it could be that CPU1 observes X!=0 breaks the loop,
	144	* we get migrated and CPU2 sees X==0.
	145	*
	146	* Since most load-store architectures implement ACQUIRE with an smp_mb() after
	147	* the LL/SC loop, they need no further barriers. Similarly all our TSO
	148	* architectures imply an smp_mb() for each atomic instruction and equally don't
	149	* need more.
	150	*
	151	* Architectures that can implement ACQUIRE better need to take care.
	152	*/
	153	#ifndef smp_mb__after_spinlock
	154	#define smp_mb__after_spinlock() do { } while (0)
	155	#endif
	156
	157	#ifdef CONFIG_DEBUG_SPINLOCK
	158	extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
	159	#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock)
	160	extern int do_raw_spin_trylock(raw_spinlock_t *lock);
	161	extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
	162	#else
	163	static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)
	164	{
	165	__acquire(lock);
	166	arch_spin_lock(&lock->raw_lock);
	167	}
	168
	169	static inline void
	170	do_raw_spin_lock_flags(raw_spinlock_t lock, unsigned long flags) __acquires(lock)
	171	{
	172	__acquire(lock);
	173	arch_spin_lock_flags(&lock->raw_lock, *flags);
	174	}
	175
	176	static inline int do_raw_spin_trylock(raw_spinlock_t *lock)
	177	{
	178	return arch_spin_trylock(&(lock)->raw_lock);
	179	}
	180
	181	static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
	182	{
	183	arch_spin_unlock(&lock->raw_lock);
	184	__release(lock);
	185	}
	186	#endif
	187
	188	/*
	189	* Define the various spin_lock methods. Note we define these
	190	* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
	191	* various methods are defined as nops in the case they are not
	192	* required.
	193	*/
	194	#define raw_spin_trylock(lock) __cond_lock(lock, _raw_spin_trylock(lock))
	195
	196	#define raw_spin_lock(lock) _raw_spin_lock(lock)
	197
	198	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	199	# define raw_spin_lock_nested(lock, subclass) \
	200	_raw_spin_lock_nested(lock, subclass)
	201
	202	# define raw_spin_lock_nest_lock(lock, nest_lock) \
	203	do { \
	204	typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
	205	_raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
	206	} while (0)
	207	#else
	208	/*
	209	* Always evaluate the 'subclass' argument to avoid that the compiler
	210	* warns about set-but-not-used variables when building with
	211	* CONFIG_DEBUG_LOCK_ALLOC=n and with W=1.
	212	*/
	213	# define raw_spin_lock_nested(lock, subclass) \
	214	_raw_spin_lock(((void)(subclass), (lock)))
	215	# define raw_spin_lock_nest_lock(lock, nest_lock) _raw_spin_lock(lock)
	216	#endif
	217
	218	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
	219
	220	#define raw_spin_lock_irqsave(lock, flags) \
	221	do { \
	222	typecheck(unsigned long, flags); \
	223	flags = _raw_spin_lock_irqsave(lock); \
	224	} while (0)
	225
	226	#ifdef CONFIG_DEBUG_LOCK_ALLOC
	227	#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
	228	do { \
	229	typecheck(unsigned long, flags); \
	230	flags = _raw_spin_lock_irqsave_nested(lock, subclass); \
	231	} while (0)
	232	#else
	233	#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
	234	do { \
	235	typecheck(unsigned long, flags); \
	236	flags = _raw_spin_lock_irqsave(lock); \
	237	} while (0)
	238	#endif
	239
	240	#else
	241
	242	#define raw_spin_lock_irqsave(lock, flags) \
	243	do { \
	244	typecheck(unsigned long, flags); \
	245	_raw_spin_lock_irqsave(lock, flags); \
	246	} while (0)
	247
	248	#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
	249	raw_spin_lock_irqsave(lock, flags)
	250
	251	#endif
	252
	253	#define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock)
	254	#define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock)
	255	#define raw_spin_unlock(lock) _raw_spin_unlock(lock)
	256	#define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock)
	257
	258	#define raw_spin_unlock_irqrestore(lock, flags) \
	259	do { \
	260	typecheck(unsigned long, flags); \
	261	_raw_spin_unlock_irqrestore(lock, flags); \
	262	} while (0)
	263	#define raw_spin_unlock_bh(lock) _raw_spin_unlock_bh(lock)
	264
	265	#define raw_spin_trylock_bh(lock) \
	266	__cond_lock(lock, _raw_spin_trylock_bh(lock))
	267
	268	#define raw_spin_trylock_irq(lock) \
	269	({ \
	270	local_irq_disable(); \
	271	raw_spin_trylock(lock) ? \
	272	1 : ({ local_irq_enable(); 0; }); \
	273	})
	274
	275	#define raw_spin_trylock_irqsave(lock, flags) \
	276	({ \
	277	local_irq_save(flags); \
	278	raw_spin_trylock(lock) ? \
	279	1 : ({ local_irq_restore(flags); 0; }); \
	280	})
	281
	282	/**
	283	* raw_spin_can_lock - would raw_spin_trylock() succeed?
	284	* @lock: the spinlock in question.
	285	*/
	286	#define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
	287
	288	/* Include rwlock functions */
	289	#include <linux/rwlock.h>
	290
	291	/*
	292	* Pull the _spin_()/_read_()/_write_*() functions/declarations:
	293	*/
	294	#if defined(CONFIG_SMP) \|\| defined(CONFIG_DEBUG_SPINLOCK)
	295	# include <linux/spinlock_api_smp.h>
	296	#else
	297	# include <linux/spinlock_api_up.h>
	298	#endif
	299
	300	/*
	301	* Map the spin_lock functions to the raw variants for PREEMPT_RT=n
	302	*/
	303
	304	static __always_inline raw_spinlock_t spinlock_check(spinlock_t lock)
	305	{
	306	return &lock->rlock;
	307	}
	308
	309	#define spin_lock_init(_lock) \
	310	do { \
	311	spinlock_check(_lock); \
	312	raw_spin_lock_init(&(_lock)->rlock); \
	313	} while (0)
	314
	315	static __always_inline void spin_lock(spinlock_t *lock)
	316	{
	317	raw_spin_lock(&lock->rlock);
	318	}
	319
	320	static __always_inline void spin_lock_bh(spinlock_t *lock)
	321	{
	322	raw_spin_lock_bh(&lock->rlock);
	323	}
	324
	325	static __always_inline int spin_trylock(spinlock_t *lock)
	326	{
	327	return raw_spin_trylock(&lock->rlock);
	328	}
	329
	330	#define spin_lock_nested(lock, subclass) \
	331	do { \
	332	raw_spin_lock_nested(spinlock_check(lock), subclass); \
	333	} while (0)
	334
	335	#define spin_lock_nest_lock(lock, nest_lock) \
	336	do { \
	337	raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \
	338	} while (0)
	339
	340	static __always_inline void spin_lock_irq(spinlock_t *lock)
	341	{
	342	raw_spin_lock_irq(&lock->rlock);
	343	}
	344
	345	#define spin_lock_irqsave(lock, flags) \
	346	do { \
	347	raw_spin_lock_irqsave(spinlock_check(lock), flags); \
	348	} while (0)
	349
	350	#define spin_lock_irqsave_nested(lock, flags, subclass) \
	351	do { \
	352	raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
	353	} while (0)
	354
	355	static __always_inline void spin_unlock(spinlock_t *lock)
	356	{
	357	raw_spin_unlock(&lock->rlock);
	358	}
	359
	360	static __always_inline void spin_unlock_bh(spinlock_t *lock)
	361	{
	362	raw_spin_unlock_bh(&lock->rlock);
	363	}
	364
	365	static __always_inline void spin_unlock_irq(spinlock_t *lock)
	366	{
	367	raw_spin_unlock_irq(&lock->rlock);
	368	}
	369
	370	static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
	371	{
	372	raw_spin_unlock_irqrestore(&lock->rlock, flags);
	373	}
	374
	375	static __always_inline int spin_trylock_bh(spinlock_t *lock)
	376	{
	377	return raw_spin_trylock_bh(&lock->rlock);
	378	}
	379
	380	static __always_inline int spin_trylock_irq(spinlock_t *lock)
	381	{
	382	return raw_spin_trylock_irq(&lock->rlock);
	383	}
	384
	385	#define spin_trylock_irqsave(lock, flags) \
	386	({ \
	387	raw_spin_trylock_irqsave(spinlock_check(lock), flags); \
	388	})
	389
	390	static __always_inline int spin_is_locked(spinlock_t *lock)
	391	{
	392	return raw_spin_is_locked(&lock->rlock);
	393	}
	394
	395	static __always_inline int spin_is_contended(spinlock_t *lock)
	396	{
	397	return raw_spin_is_contended(&lock->rlock);
	398	}
	399
	400	static __always_inline int spin_can_lock(spinlock_t *lock)
	401	{
	402	return raw_spin_can_lock(&lock->rlock);
	403	}
	404
	405	#define assert_spin_locked(lock) assert_raw_spin_locked(&(lock)->rlock)
	406
	407	/*
	408	* Pull the atomic_t declaration:
	409	* (asm-mips/atomic.h needs above definitions)
	410	*/
	411	#include <linux/atomic.h>
	412	/**
	413	* atomic_dec_and_lock - lock on reaching reference count zero
	414	* @atomic: the atomic counter
	415	* @lock: the spinlock in question
	416	*
	417	* Decrements @atomic by 1. If the result is 0, returns true and locks
	418	* @lock. Returns false for all other cases.
	419	*/
	420	extern int _atomic_dec_and_lock(atomic_t atomic, spinlock_t lock);
	421	#define atomic_dec_and_lock(atomic, lock) \
	422	__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
	423
	424	#endif /* __LINUX_SPINLOCK_H */