cgroup: remove now unused css_depth()

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 0 insertions, 12 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index bc53d5014b28..d4a329f5874c 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5227,18 +5227,6 @@ unsigned short css_id(struct cgroup_subsys_state *css)
 }
 EXPORT_SYMBOL_GPL(css_id);
 
-unsigned short css_depth(struct cgroup_subsys_state *css)
-{
-        struct css_id *cssid;
-
-        cssid = rcu_dereference_check(css->id, css_refcnt(css));
-
-        if (cssid)
-                return cssid->depth;
-        return 0;
-}
-EXPORT_SYMBOL_GPL(css_depth);
-
 /**
  *  css_is_ancestor - test "root" css is an ancestor of "child"
  * @child: the css to be tested.