>From 13fa1b9b162483df5d88b7aefe408a4e17e83338 Mon Sep 17 00:00:00 2001
From: Akira Yokosawa <akiyks@xxxxxxxxx>
Date: Wed, 12 Sep 2018 19:27:41 +0900
Subject: [PATCH] CodeSamples/count: Use READ_ONCE/WRITE_ONCE in count_nonatomic.c
Without them, inlined accesses can be optimized away by "-O3".
Signed-off-by: Akira Yokosawa <akiyks@xxxxxxxxx>
---
CodeSamples/count/count_nonatomic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/CodeSamples/count/count_nonatomic.c b/CodeSamples/count/count_nonatomic.c
index 90979c5..50df475 100644
--- a/CodeSamples/count/count_nonatomic.c
+++ b/CodeSamples/count/count_nonatomic.c
@@ -25,12 +25,12 @@ unsigned long counter = 0;
__inline__ void inc_count(void)
{
- counter++;
+ WRITE_ONCE(counter, READ_ONCE(counter) + 1);
}
__inline__ unsigned long read_count(void)
{
- return counter;
+ return READ_ONCE(counter);
}
__inline__ void count_init(void)
--
2.7.4
