Commit-ID: 9d162cd06349dfee6b4f254b3abf1355cf0aee43
Gitweb: http://git.kernel.org/tip/9d162cd06349dfee6b4f254b3abf1355cf0aee43
Author: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
AuthorDate: Sun, 1 Sep 2013 16:42:52 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Thu, 12 Dec 2013 12:19:22 -0800
rcu: Make rcu_assign_pointer's assignment volatile and type-safe
The rcu_assign_pointer() primitive needs to use ACCESS_ONCE to make
the assignment to the destination pointer volatile, to protect against
compilers too clever for their own good.
Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
include/linux/rcupdate.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 00ad281..97853cd 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -551,7 +551,7 @@ static inline void rcu_preempt_sleep_check(void)
#define __rcu_assign_pointer(p, v, space) \
do { \
smp_wmb(); \
- (p) = (typeof(*v) __force space *)(v); \
+ ACCESS_ONCE(p) = (typeof(*(v)) __force space *)(v); \
} while (0)
--
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