[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / include / asm / mutex.h

/*
 * arch/arm/include/asm/mutex.h
 *
 * ARM optimized mutex locking primitives
 *
 * Please look into asm-generic/mutex-xchg.h for a formal definition.
 */
#ifndef _ASM_MUTEX_H
#define _ASM_MUTEX_H
/*
 * On pre-ARMv6 hardware this results in a swp-based implementation,
 * which is the most efficient. For ARMv6+, we have exclusive memory
 * accessors and use atomic_dec to avoid the extra xchg operations
 * on the locking slowpaths.
 */
#if __LINUX_ARM_ARCH__ < 6
#include <asm-generic/mutex-xchg.h>
#else
#include <asm-generic/mutex-dec.h>
#endif
#endif	/* _ASM_MUTEX_H */
Commit	Line	Data
823d0f4f	1	/*
4baa9922	2	* arch/arm/include/asm/mutex.h
823d0f4f NP	3	*
	4	* ARM optimized mutex locking primitives
	5	*
	6	* Please look into asm-generic/mutex-xchg.h for a formal definition.
	7	*/
	8	#ifndef _ASM_MUTEX_H
	9	#define _ASM_MUTEX_H
823d0f4f	10	/*
a76d7bd9	11	* On pre-ARMv6 hardware this results in a swp-based implementation,
08928e7a WD	12	* which is the most efficient. For ARMv6+, we have exclusive memory
	13	* accessors and use atomic_dec to avoid the extra xchg operations
	14	* on the locking slowpaths.
823d0f4f	15	*/
08928e7a	16	#if __LINUX_ARM_ARCH__ < 6
a76d7bd9	17	#include <asm-generic/mutex-xchg.h>
08928e7a WD	18	#else
08928e7a WD	19	#include <asm-generic/mutex-dec.h>
823d0f4f	20	#endif
08928e7a	21	#endif /* _ASM_MUTEX_H */