diff options
| -rw-r--r-- | mm/memcontrol.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 9be3cf8a5da..0e3fdbd809c 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1485,7 +1485,8 @@ void mem_cgroup_update_file_mapped(struct page *page, int val) SetPageCgroupFileMapped(pc); } else { __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); - ClearPageCgroupFileMapped(pc); + if (!page_mapped(page)) /* for race between dec->inc counter */ + ClearPageCgroupFileMapped(pc); } done: |