rcu: Delay rcu_barrier() wait until beginning of next CPU-hotunplug operation.

[safe/jmp/linux-2.6] / kernel / rcupdate.c

diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 8df1156..bd5d5c8 100644 (file)
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -238,7 +238,8 @@ static int __cpuinit rcu_barrier_cpu_hotplug(struct notifier_block *self,
                call_rcu_bh(rcu_migrate_head, rcu_migrate_callback);
                call_rcu_sched(rcu_migrate_head + 1, rcu_migrate_callback);
                call_rcu(rcu_migrate_head + 2, rcu_migrate_callback);
-       } else if (action == CPU_POST_DEAD) {
+       } else if (action == CPU_DOWN_PREPARE) {
+               /* Don't need to wait until next removal operation. */
                /* rcu_migrate_head is protected by cpu_add_remove_lock */
                wait_migrated_callbacks();
        }