[PATCH v5 5/5] ufs: wmb is not implemented in x86.

[Raz Ben Yehuda via B4 Relay]

From: Raz Ben Yehuda <raz.benyehuda at mobileye.com>

sfence: All stores (writes) issued before the fence become
globally visible before any store issued after the fence
memory: Compiler barrier

Signed-off-by: Raz Ben Yehuda <raz.benyehuda at mobileye.com>
---
 arch/x86/include/asm/io.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 1390193f09c..9293588c9d7 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -241,6 +241,8 @@ static inline void sync(void)
  */
 #define dmb()		__asm__ __volatile__ ("" : : : "memory")
 #define mb()		__asm__ __volatile__ ("mfence" : : : "memory")
+#define wmb()		__asm__ __volatile__ ("sfence" ::: "memory") /* store mem barrier */
+
 #define __iormb()	dmb()
 #define __iowmb()	dmb()
 

-- 
2.43.0