cgroup: add css_parent()

[cascardo/linux.git] / mm / hugetlb_cgroup.c

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 95585a0..57ecb5d 100644 (file)
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -59,11 +59,7 @@ static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
 static inline struct hugetlb_cgroup *
 parent_hugetlb_cgroup(struct hugetlb_cgroup *h_cg)
 {
-       struct cgroup *parent = h_cg->css.cgroup->parent;
-
-       if (!parent)
-               return NULL;
-       return hugetlb_cgroup_from_cgroup(parent);
+       return hugetlb_cgroup_from_css(css_parent(&h_cg->css));
 }
 
 static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg)