[deliverable/linux.git] / arch / arm / include / asm / mcs_spinlock.h

#ifndef __ASM_MCS_LOCK_H
#define __ASM_MCS_LOCK_H

#ifdef CONFIG_SMP
#include <asm/spinlock.h>

/* MCS spin-locking. */
#define arch_mcs_spin_lock_contended(lock)				\
do {									\
	/* Ensure prior stores are observed before we enter wfe. */	\
	smp_mb();							\
	while (!(smp_load_acquire(lock)))				\
		wfe();							\
} while (0)								\

#define arch_mcs_spin_unlock_contended(lock)				\
do {									\
	smp_store_release(lock, 1);					\
	dsb_sev();							\
} while (0)

#endif	/* CONFIG_SMP */
#endif	/* __ASM_MCS_LOCK_H */
Commit	Line	Data
bf67fd31 WD	1	#ifndef __ASM_MCS_LOCK_H
	2	#define __ASM_MCS_LOCK_H
	3
	4	#ifdef CONFIG_SMP
	5	#include <asm/spinlock.h>
	6
	7	/* MCS spin-locking. */
	8	#define arch_mcs_spin_lock_contended(lock) \
	9	do { \
	10	/* Ensure prior stores are observed before we enter wfe. */ \
	11	smp_mb(); \
	12	while (!(smp_load_acquire(lock))) \
	13	wfe(); \
	14	} while (0) \
	15
	16	#define arch_mcs_spin_unlock_contended(lock) \
	17	do { \
	18	smp_store_release(lock, 1); \
	19	dsb_sev(); \
	20	} while (0)
	21
	22	#endif /* CONFIG_SMP */
	23	#endif /* __ASM_MCS_LOCK_H */