| /* |
| * 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 */ |
