cgroup: add/update accessors which obtain subsys specific data from css

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

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index d2f9fc0b186e3965cc43cb17906f348bfeefb5ce..95585a0b9c8da8b1582d2341720a944b3b47a0b7 100644 (file)
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -36,7 +36,7 @@ static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
 static inline
 struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
 {
-       return container_of(s, struct hugetlb_cgroup, css);
+       return s ? container_of(s, struct hugetlb_cgroup, css) : NULL;
 }
 
 static inline