1 files changed, 4 insertions, 3 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a7ecf23150c5..0ed61e27d526 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1169,10 +1169,11 @@ void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
         /*
          * Now swap is on-memory. This means this page may be
          * counted both as mem and swap....double count.
-         * Fix it by uncharging from memsw. This SwapCache is stable
-         * because we're still under lock_page().
+         * Fix it by uncharging from memsw. Basically, this SwapCache is stable
+         * under lock_page(). But in do_swap_page()::memory.c, reuse_swap_page()
+         * may call delete_from_swap_cache() before reach here.
          */
-        if (do_swap_account) {
+        if (do_swap_account && PageSwapCache(page)) {
                 swp_entry_t ent = {.val = page_private(page)};
                 struct mem_cgroup *memcg;
                 memcg = swap_cgroup_record(ent, NULL);