>From e61f1ef20186fe24d7cec92b43f41a5efda524cb Mon Sep 17 00:00:00 2001
From: Akira Yokosawa <akiyks@xxxxxxxxx>
Date: Mon, 22 May 2017 23:42:06 +0900
Subject: [PATCH 1/2] toolsoftrade: Update definition of READ_ONCE()
Reflect the change in commit 85747990ec80 ("count: Don't in-place
increment a READ_ONCE()").
Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx>
---
toolsoftrade/toolsoftrade.tex | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/toolsoftrade/toolsoftrade.tex b/toolsoftrade/toolsoftrade.tex
index cecb2d3..9ccd4bc 100644
--- a/toolsoftrade/toolsoftrade.tex
+++ b/toolsoftrade/toolsoftrade.tex
@@ -1258,7 +1258,8 @@ but may be implemented straightforwardly as follows:
\scriptsize
\begin{verbatim}
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
-#define READ_ONCE(x) ACCESS_ONCE(x)
+#define READ_ONCE(x) \
+ ({ typeof(x) ___x = ACCESS_ONCE(x); ___x; })
#define WRITE_ONCE(x, val) ({ ACCESS_ONCE(x) = (val); })
#define barrier() __asm__ __volatile__("": : :"memory")
\end{verbatim}
--
2.7.4
--
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