From: Chris Metcalf <cmetcalf@tilera.com>
Date: Fri, 25 Feb 2011 13:46:38 +0000 (-0500)
Subject: arch/tile: Fix atomic_read() definition to use ACCESS_ONCE
X-Git-Tag: firefly_0821_release~7613^2~2159^2~22
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d356b595e5a95c0c2305ec0a7d1cdb3e26f57716;p=firefly-linux-kernel-4.4.55.git

arch/tile: Fix atomic_read() definition to use ACCESS_ONCE

This adds the volatile cast which forces the compiler to emit the load.
Suggested by Peter Zijlstra <peterz@infradead.org>.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
---

diff --git a/arch/tile/include/asm/atomic.h b/arch/tile/include/asm/atomic.h
index b8c49f98a44c..75a16028a952 100644
--- a/arch/tile/include/asm/atomic.h
+++ b/arch/tile/include/asm/atomic.h
@@ -32,7 +32,7 @@
  */
 static inline int atomic_read(const atomic_t *v)
 {
-       return v->counter;
+	return ACCESS_ONCE(v->counter);
 }
 
 /**