From: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/backport-include/linux/compiler-gccN.h | 4 ++++
backport/backport-include/linux/compiler.h | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/backport/backport-include/linux/compiler-gccN.h b/backport/backport-include/linux/compiler-gccN.h
index 23ad803dce0b..97e7541d1ab1 100644
--- a/backport/backport-include/linux/compiler-gccN.h
+++ b/backport/backport-include/linux/compiler-gccN.h
@@ -120,3 +120,7 @@
#endif
#endif /* gcc version >= 40000 specific checks */
+
+#ifndef OPTIMIZER_HIDE_VAR
+#define OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "=r" (var) : "0" (var))
+#endif
diff --git a/backport/backport-include/linux/compiler.h b/backport/backport-include/linux/compiler.h
index e5af565b13dc..53c069df10a8 100644
--- a/backport/backport-include/linux/compiler.h
+++ b/backport/backport-include/linux/compiler.h
@@ -88,4 +88,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
})
#endif
+#ifndef OPTIMIZER_HIDE_VAR
+#define OPTIMIZER_HIDE_VAR(var) barrier()
+#endif
+
#endif /* __BACKPORT_LINUX_COMPILER_H */
--
2.14.2
--
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