From 18eec587c6697c3f483675bfde72d12ebe32eac0 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 25 Apr 2012 11:03:38 +1000
Subject: [PATCH] 
 memcg-move-hugetlb-resource-count-to-parent-cgroup-on-memcg-removal-fix-fix

Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/hugetlb.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 828b073a9f70..a2e45ab1c489 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -343,8 +343,15 @@ static inline unsigned int pages_per_huge_page(struct hstate *h)
 #define hstate_index(h) 0
 #endif
 
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
 #ifdef CONFIG_MEM_RES_CTLR_HUGETLB
 extern int hugetlb_force_memcg_empty(struct cgroup *cgroup);
+#else
+static inline int hugetlb_force_memcg_empty(struct cgroup *cgroup)
+{
+	return 0;
+}
+#endif
 #endif
 
 #endif /* _LINUX_HUGETLB_H */
-- 
2.39.5