diff options
Diffstat (limited to 'arch/arm/include/asm/mutex.h')
| -rw-r--r-- | arch/arm/include/asm/mutex.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm/include/asm/mutex.h b/arch/arm/include/asm/mutex.h index b1479fd04a95..87c044910fe0 100644 --- a/arch/arm/include/asm/mutex.h +++ b/arch/arm/include/asm/mutex.h | |||
| @@ -9,8 +9,13 @@ | |||
| 9 | #define _ASM_MUTEX_H | 9 | #define _ASM_MUTEX_H |
| 10 | /* | 10 | /* |
| 11 | * On pre-ARMv6 hardware this results in a swp-based implementation, | 11 | * On pre-ARMv6 hardware this results in a swp-based implementation, |
| 12 | * which is the most efficient. For ARMv6+, we emit a pair of exclusive | 12 | * which is the most efficient. For ARMv6+, we have exclusive memory |
| 13 | * accesses instead. | 13 | * accessors and use atomic_dec to avoid the extra xchg operations |
| 14 | * on the locking slowpaths. | ||
| 14 | */ | 15 | */ |
| 16 | #if __LINUX_ARM_ARCH__ < 6 | ||
| 15 | #include <asm-generic/mutex-xchg.h> | 17 | #include <asm-generic/mutex-xchg.h> |
| 18 | #else | ||
| 19 | #include <asm-generic/mutex-dec.h> | ||
| 16 | #endif | 20 | #endif |
| 21 | #endif /* _ASM_MUTEX_H */ | ||