Commit 9d162cd0 authored Sep 01, 2013 by Josh Triplett Committed by Paul E. McKenney Dec 12, 2013

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@joshtriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent 36708b89

include/linux/rcupdate.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)