memcg: fix GPF when cgroup removal races with last exit

[can-eth-gw-linux.git] / mm / swap.c

diff --git a/mm/swap.c b/mm/swap.c
index fff1ff7fb9ada36fca1be10d33dec593486f50a6..14380e9fbe3380b927cb58d75c5a950a5ec14f77 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -652,7 +652,7 @@ EXPORT_SYMBOL(__pagevec_release);
 void lru_add_page_tail(struct zone* zone,
                       struct page *page, struct page *page_tail)
 {
-       int active;
+       int uninitialized_var(active);
        enum lru_list lru;
        const int file = 0;
 
@@ -672,7 +672,6 @@ void lru_add_page_tail(struct zone* zone,
                        active = 0;
                        lru = LRU_INACTIVE_ANON;
                }
-               update_page_reclaim_stat(zone, page_tail, file, active);
        } else {
                SetPageUnevictable(page_tail);
                lru = LRU_UNEVICTABLE;
@@ -693,6 +692,9 @@ void lru_add_page_tail(struct zone* zone,
                list_head = page_tail->lru.prev;
                list_move_tail(&page_tail->lru, list_head);
        }
+
+       if (!PageUnevictable(page))
+               update_page_reclaim_stat(zone, page_tail, file, active);
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
@@ -710,8 +712,8 @@ static void __pagevec_lru_add_fn(struct page *page, void *arg)
        SetPageLRU(page);
        if (active)
                SetPageActive(page);
-       update_page_reclaim_stat(zone, page, file, active);
        add_page_to_lru_list(zone, page, lru);
+       update_page_reclaim_stat(zone, page, file, active);
 }
 
 /*