1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 79993ac066c5..7e9fa505b7bb 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -250,6 +250,9 @@ enum {
          *
          * - "cgroup.clone_children" is removed.
          *
+         * - If mount is requested with sane_behavior but without any
+         *   subsystem, the default unified hierarchy is mounted.
+         *
          * - cpuset: tasks will be kept in empty cpusets when hotplug happens
          *   and take masks of ancestors with non-empty cpus/mems, instead of
          *   being moved to an ancestor.
@@ -468,6 +471,13 @@ struct cftype {
 #endif
 };
 
+extern struct cgroup_root cgrp_dfl_root;
+
+static inline bool cgroup_on_dfl(const struct cgroup *cgrp)
+{
+        return cgrp->root == &cgrp_dfl_root;
+}
+
 /*
  * See the comment above CGRP_ROOT_SANE_BEHAVIOR for details.  This
  * function can be called as long as @cgrp is accessible.