alinux: mm: memcontrol: memcg_wmark_wq can be static

Fixes: 8b371635 ("alinux: mm: memcontrol: support background async page reclaim")
Signed-off-by: Nkbuild test robot <lkp@intel.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Xunlei Pang <xlpang@linux.alibaba.com>
Acked-by: NJoseph Qi <joseph.qi@linux.alibaba.com>

mm/memcontrol.c

@@ -95,7 +95,7 @@ int do_swap_account __read_mostly;
 #define do_swap_account		0
 #endif
 
-struct workqueue_struct *memcg_wmark_wq;
+static struct workqueue_struct *memcg_wmark_wq;
 
 /* Whether legacy memory+swap accounting is active */
 static bool do_memsw_account(void)