From: Andrew Morton <akpm@linux-foundation.org>

mm/memcontrol.c: In function 'mem_cgroup_charge':
mm/memcontrol.c:337: error: implicit declaration of function 'congestion_wait'

Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Paul Menage <menage@google.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memcontrol.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN mm/memcontrol.c~memory-controller-add-per-cgroup-lru-and-reclaim-v7-fix mm/memcontrol.c
--- a/mm/memcontrol.c~memory-controller-add-per-cgroup-lru-and-reclaim-v7-fix
+++ a/mm/memcontrol.c
@@ -22,6 +22,7 @@
 #include <linux/cgroup.h>
 #include <linux/mm.h>
 #include <linux/page-flags.h>
+#include <linux/backing-dev.h>
 #include <linux/bit_spinlock.h>
 #include <linux/rcupdate.h>
 #include <linux/swap.h>
_