cgroups: Replace synchronize_sched() with synchronize_rcu()

Now that synchronize_rcu() waits for preempt-disable regions of code
as well as RCU read-side critical sections, synchronize_sched() can be
replaced by synchronize_rcu().  This commit therefore makes this change,
even though it is but a comment.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: "Dennis Zhou (Facebook)" <dennisszhou@gmail.com>
Acked-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 6aaf5dd5383bba294719772bc76b7c1664d54ea9..7a8429f8e2803fe89b337143ea181fe7f7907913 100644 (file)
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5343,7 +5343,7 @@ int __init cgroup_init(void)
        cgroup_rstat_boot();
 
        /*
-        * The latency of the synchronize_sched() is too high for cgroups,
+        * The latency of the synchronize_rcu() is too high for cgroups,
         * avoid it at the cost of forcing all readers into the slow path.
         */
        rcu_sync_enter_start(&cgroup_threadgroup_rwsem.rss);