1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 44245ae4c1c2..a905d3ba8673 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3299,6 +3299,7 @@ static void rcu_exp_gp_seq_start(struct rcu_state *rsp)
 static void rcu_exp_gp_seq_end(struct rcu_state *rsp)
 {
         rcu_seq_end(&rsp->expedited_sequence);
+        smp_mb(); /* Ensure that consecutive grace periods serialize. */
 }
 static unsigned long rcu_exp_gp_seq_snap(struct rcu_state *rsp)
 {
@@ -3431,7 +3432,6 @@ void synchronize_sched_expedited(void)
 
         rcu_exp_gp_seq_end(rsp);
         mutex_unlock(&rnp->exp_funnel_mutex);
-        smp_mb(); /* ensure subsequent action seen after grace period. */
 
         put_online_cpus();
 }