cgroup: properly init u64_stats

Lockdep complains that the stats update is trying to register a non-static
key. This is because u64_stats are using a seqlock on 32bit arches, which
needs to be initialized before usage.

Fixes: 041cd640b2f3 (cgroup: Implement cgroup2 basic CPU usage accounting)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup/stat.c b/kernel/cgroup/stat.c
index 133b465691d6fe82462c33215639b6b7f97f04b7..1e111dd455c49cd9f8e3e7619fb4f11eaffb3c71 100644 (file)
--- a/kernel/cgroup/stat.c
+++ b/kernel/cgroup/stat.c
@@ -296,8 +296,12 @@ int cgroup_stat_init(struct cgroup *cgrp)
        }
 
        /* ->updated_children list is self terminated */
-       for_each_possible_cpu(cpu)
-               cgroup_cpu_stat(cgrp, cpu)->updated_children = cgrp;
+       for_each_possible_cpu(cpu) {
+               struct cgroup_cpu_stat *cstat = cgroup_cpu_stat(cgrp, cpu);
+
+               cstat->updated_children = cgrp;
+               u64_stats_init(&cstat->sync);
+       }
 
        prev_cputime_init(&cgrp->stat.prev_cputime);