1/*
 2 * arch/arm/include/asm/mutex.h
 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
10/*
11 * On pre-ARMv6 hardware this results in a swp-based implementation,
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.
15 */
16#if __LINUX_ARM_ARCH__ < 6
17#include <asm-generic/mutex-xchg.h>
18#else
19#include <asm-generic/mutex-dec.h>
20#endif
21#endif	/* _ASM_MUTEX_H */