memcg: fix deadlock between lock_page_cgroup and mapping tree_lock

[pandora-kernel.git] / mm / swap_state.c

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 3ecea98..1416e7e 100644 (file)
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -109,8 +109,6 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
  */
 void __delete_from_swap_cache(struct page *page)
 {
-       swp_entry_t ent = {.val = page_private(page)};
-
        VM_BUG_ON(!PageLocked(page));
        VM_BUG_ON(!PageSwapCache(page));
        VM_BUG_ON(PageWriteback(page));
@@ -121,7 +119,6 @@ void __delete_from_swap_cache(struct page *page)
        total_swapcache_pages--;
        __dec_zone_page_state(page, NR_FILE_PAGES);
        INC_CACHE_INFO(del_total);
-       mem_cgroup_uncharge_swapcache(page, ent);
 }
 
 /**
@@ -191,6 +188,7 @@ void delete_from_swap_cache(struct page *page)
        __delete_from_swap_cache(page);
        spin_unlock_irq(&swapper_space.tree_lock);
 
+       mem_cgroup_uncharge_swapcache(page, entry);
        swap_free(entry);
        page_cache_release(page);
 }