[PATCH] ARM SMP: Add ARMv6 memory barriers

Convert explicit gcc asm-based memory barriers into smp_mb() calls.
These change between barrier() and the ARMv6 data memory barrier
instruction depending on whether ARMv6 SMP is enabled.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h
index 4edd4dc40c5b..c1adc6b3e86d 100644
--- a/include/asm-arm/bitops.h
+++ b/include/asm-arm/bitops.h
@@ -21,8 +21,8 @@
 
 #include <asm/system.h>
 
-#define smp_mb__before_clear_bit()      do { } while (0)
-#define smp_mb__after_clear_bit()       do { } while (0)
+#define smp_mb__before_clear_bit()      mb()
+#define smp_mb__after_clear_bit()       mb()
 
 /*
  * These functions are the basis of our bit ops.