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-rw-r--r--kernel/cgroup/rstat.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/kernel/cgroup/rstat.c b/kernel/cgroup/rstat.c
index 6f87352f8219..41ca996568df 100644
--- a/kernel/cgroup/rstat.c
+++ b/kernel/cgroup/rstat.c
@@ -33,12 +33,9 @@ void cgroup_rstat_updated(struct cgroup *cgrp, int cpu)
return;
/*
- * Paired with the one in cgroup_rstat_cpu_pop_updated(). Either we
- * see NULL updated_next or they see our updated stat.
- */
- smp_mb();
-
- /*
+ * Speculative already-on-list test. This may race leading to
+ * temporary inaccuracies, which is fine.
+ *
* Because @parent's updated_children is terminated with @parent
* instead of NULL, we can tell whether @cgrp is on the list by
* testing the next pointer for NULL.
@@ -134,13 +131,6 @@ static struct cgroup *cgroup_rstat_cpu_pop_updated(struct cgroup *pos,
*nextp = rstatc->updated_next;
rstatc->updated_next = NULL;
- /*
- * Paired with the one in cgroup_rstat_cpu_updated().
- * Either they see NULL updated_next or we see their
- * updated stat.
- */
- smp_mb();
-
return pos;
}