diff --git a/[refs] b/[refs]
index ef4df6ad0261..6a58f9eb1054 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c96ea7cfdd88d0a67c970502bc5313fede34b86b
+refs/heads/master: fdab649b1aa732cd6e79654349088465cdff49af
diff --git a/trunk/kernel/rcutree.c b/trunk/kernel/rcutree.c
index 98f275296c6d..ba4f4b4c2382 100644
--- a/trunk/kernel/rcutree.c
+++ b/trunk/kernel/rcutree.c
@@ -1922,8 +1922,6 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
 	head->func = func;
 	head->next = NULL;
 
-	smp_mb(); /* Ensure RCU update seen before callback registry. */
-
 	/*
 	 * Opportunistically note grace-period endings and beginnings.
 	 * Note that we might see a beginning right after we see an