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-rw-r--r--kernel/rcu/srcutree.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/rcu/srcutree.c b/kernel/rcu/srcutree.c
index 94bd6ed43ea3..c1c0ee3cce3b 100644
--- a/kernel/rcu/srcutree.c
+++ b/kernel/rcu/srcutree.c
@@ -897,6 +897,15 @@ static void __synchronize_srcu(struct srcu_struct *sp, bool do_norm)
__call_srcu(sp, &rcu.head, wakeme_after_rcu, do_norm);
wait_for_completion(&rcu.completion);
destroy_rcu_head_on_stack(&rcu.head);
+
+ /*
+ * Make sure that later code is ordered after the SRCU grace
+ * period. This pairs with the raw_spin_lock_irq_rcu_node()
+ * in srcu_invoke_callbacks(). Unlike Tree RCU, this is needed
+ * because the current CPU might have been totally uninvolved with
+ * (and thus unordered against) that grace period.
+ */
+ smp_mb();
}
/**