1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f2a3f5c9936c..382109b5baeb 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -3405,7 +3405,7 @@ unsigned short css_depth(struct cgroup_subsys_state *css)
 }
 
 bool css_is_ancestor(struct cgroup_subsys_state *child,
-                    struct cgroup_subsys_state *root)
+                    const struct cgroup_subsys_state *root)
 {
         struct css_id *child_id = rcu_dereference(child->id);
         struct css_id *root_id = rcu_dereference(root->id);