From: François Tigeot <ftigeot@wolfpond.org>
Date: Fri, 17 Mar 2017 07:13:38 +0000 (+0100)
Subject: drm/linux: Add smp_store_mb()
X-Git-Tag: v5.1.0~760
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/1bc7ad412684a2c4eaef2f6de1cef9bd6baba3d5

drm/linux: Add smp_store_mb()
---

diff --git a/sys/dev/drm/include/asm/barrier.h b/sys/dev/drm/include/asm/barrier.h
index 0c54f5d972..7b083e59c6 100644
--- a/sys/dev/drm/include/asm/barrier.h
+++ b/sys/dev/drm/include/asm/barrier.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 François Tigeot
+ * Copyright (c) 2015-2017 François Tigeot
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -35,4 +35,9 @@
 #define smp_rmb()	rmb()
 #define smp_wmb()	barrier()
 
+#define smp_store_mb(var, value) do {	\
+	WRITE_ONCE(var, value);		\
+	cpu_mfence();			\
+} while (0)
+
 #endif	/* _ASM_BARRIER_H_ */