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-rw-r--r--include/linux/cgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index e4e8e117d27..499900d0cee 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -378,6 +378,7 @@ struct cgroup_subsys {
* - initiating hotplug events
*/
struct mutex hierarchy_mutex;
+ struct lock_class_key subsys_key;
/*
* Link to parent, and list entry in parent's children.