Author: hselasky
Date: Mon Aug 14 13:15:13 2017
New Revision: 322501
URL: https://svnweb.freebsd.org/changeset/base/322501
Log:
MFC r292537 and r314878:
Implement ACCESS_ONCE(), WRITE_ONCE() and READ_ONCE().
Sponsored by: Mellanox Technologies
Modified:
stable/9/sys/ofed/include/linux/compiler.h
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/ofed/include/linux/compiler.h
==============================================================================
--- stable/9/sys/ofed/include/linux/compiler.h Mon Aug 14 12:59:14 2017
(r322500)
+++ stable/9/sys/ofed/include/linux/compiler.h Mon Aug 14 13:15:13 2017
(r322501)
@@ -63,4 +63,21 @@
#define uninitialized_var(x) x = x
+#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x))
+
+#define WRITE_ONCE(x,v) do { \
+ barrier(); \
+ ACCESS_ONCE(x) = (v); \
+ barrier(); \
+} while (0)
+
+#define READ_ONCE(x) ({ \
+ __typeof(x) __var = ({ \
+ barrier(); \
+ ACCESS_ONCE(x); \
+ }); \
+ barrier(); \
+ __var; \
+})
+
#endif /* _LINUX_COMPILER_H_ */
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