mm: vmscan: detect file thrashing at the reclaim root

[platform/kernel/linux-rpi.git] / include / linux / memcontrol.h

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d9b3592..d13d697 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -913,6 +913,11 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
        return &pgdat->__lruvec;
 }
 
+static inline struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
+{
+       return NULL;
+}
+
 static inline bool mm_match_cgroup(struct mm_struct *mm,
                struct mem_cgroup *memcg)
 {