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 b8c49f9..75a1602 100644 (file)
--- 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);
 }
 
 /**