1 files changed, 9 insertions, 9 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9ed760dc7448..f4ede99c8b9b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1359,16 +1359,19 @@ void mem_cgroup_update_file_mapped(struct page *page, int val)
 
         lock_page_cgroup(pc);
         mem = pc->mem_cgroup;
-        if (!mem)
-                goto done;
-
-        if (!PageCgroupUsed(pc))
+        if (!mem || !PageCgroupUsed(pc))
                 goto done;
 
         /*
          * Preemption is already disabled. We can use __this_cpu_xxx
          */
-        __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val);
+        if (val > 0) {
+                __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
+                SetPageCgroupFileMapped(pc);
+        } else {
+                __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);
+                ClearPageCgroupFileMapped(pc);
+        }
 
 done:
         unlock_page_cgroup(pc);
@@ -1801,16 +1804,13 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
 static void __mem_cgroup_move_account(struct page_cgroup *pc,
         struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge)
 {
-        struct page *page;
-
         VM_BUG_ON(from == to);
         VM_BUG_ON(PageLRU(pc->page));
         VM_BUG_ON(!PageCgroupLocked(pc));
         VM_BUG_ON(!PageCgroupUsed(pc));
         VM_BUG_ON(pc->mem_cgroup != from);
 
-        page = pc->page;
-        if (page_mapped(page) && !PageAnon(page)) {
+        if (PageCgroupFileMapped(pc)) {
                 /* Update mapped_file data for mem_cgroup */
                 preempt_disable();
                 __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]);