/* | |
* 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 */ |