[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>
diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h
index 4edd4dc..c1adc6b 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.