[PATCH -mmotm] build fix for memcg-move-charges-of-anonymous-swap.patch

[Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>]

build fix in !CONFIG_SWAP case.

  CC      mm/memcontrol.o
mm/memcontrol.c: In function 'is_target_pte_for_mc':
mm/memcontrol.c:3648: error: implicit declaration of function 'mem_cgroup_count_swap_user'
make[1]: *** [mm/memcontrol.o] Error 1
make: *** [mm] Error 2

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
---
This can be applied after memcg-move-charges-of-anonymous-swap.patch.

 include/linux/swap.h |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index d9b06f7..2e1d5c9 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -287,6 +287,10 @@ extern int shmem_unuse(swp_entry_t entry, struct page *page);
 
 extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
 
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+extern int mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep);
+#endif
+
 #ifdef CONFIG_SWAP
 /* linux/mm/page_io.c */
 extern int swap_readpage(struct page *);
@@ -356,7 +360,6 @@ static inline void disable_swap_token(void)
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
 extern void
 mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout);
-extern int mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep);
 #else
 static inline void
 mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
-- 
1.5.6.1

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