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-rw-r--r--arch/arm/include/asm/mutex.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm/include/asm/mutex.h b/arch/arm/include/asm/mutex.h
index b1479fd..6e813d9 100644
--- a/arch/arm/include/asm/mutex.h
+++ b/arch/arm/include/asm/mutex.h
@@ -9,8 +9,13 @@
#define _ASM_MUTEX_H
/*
* On pre-ARMv6 hardware this results in a swp-based implementation,
- * which is the most efficient. For ARMv6+, we emit a pair of exclusive
- * accesses instead.
+ * 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