[PATCH v2 4/6] memcg: export nr_swap_files

[Jeff Liu <jeff.liu@oracle.com>]

Export nr_swap_files which would be used for initializing and destorying
swap cgroup structures in the coming patch.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
CC: Glauber Costa <glommer@parallels.com>
CC: Michal Hocko <mhocko@suse.cz>
CC: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Johannes Weiner <hannes@cmpxchg.org>
CC: Mel Gorman <mgorman@suse.de>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Sha Zhengju <handai.szj@taobao.com>

---
 include/linux/swap.h |    1 +
 mm/swapfile.c        |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 68df9c1..6de44c9 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -348,6 +348,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t,
 /* linux/mm/swapfile.c */
 extern long nr_swap_pages;
 extern long total_swap_pages;
+extern unsigned int nr_swapfiles;
 extern void si_swapinfo(struct sysinfo *);
 extern swp_entry_t get_swap_page(void);
 extern swp_entry_t get_swap_page_of_type(int);
diff --git a/mm/swapfile.c b/mm/swapfile.c
index e97a0e5..89cebcf 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -46,7 +46,7 @@ static void free_swap_count_continuations(struct swap_info_struct *);
 static sector_t map_swap_entry(swp_entry_t, struct block_device**);
 
 DEFINE_SPINLOCK(swap_lock);
-static unsigned int nr_swapfiles;
+unsigned int nr_swapfiles;
 long nr_swap_pages;
 long total_swap_pages;
 static int least_priority;
-- 
1.7.9.5

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