[Xen-devel] [PATCH=v3 5/8] xen: arm: Use dmb for smp barriers

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

The full power of dsb is not required in this context.

Also change wmb() to be dsb() directly instead of indirectly via mb(), for
clarity.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
---
 xen/include/asm-arm/system.h |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/include/asm-arm/system.h b/xen/include/asm-arm/system.h
index e003624..89c61ef 100644
--- a/xen/include/asm-arm/system.h
+++ b/xen/include/asm-arm/system.h
@@ -18,11 +18,11 @@
 
 #define mb()            dsb()
 #define rmb()           dsb()
-#define wmb()           mb()
+#define wmb()           dsb()
 
-#define smp_mb()        mb()
-#define smp_rmb()       rmb()
-#define smp_wmb()       wmb()
+#define smp_mb()        dmb()
+#define smp_rmb()       dmb()
+#define smp_wmb()       dmb()
 
 #define xchg(ptr,x) \
         ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
-- 
1.7.10.4


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