Merge commit 'origin/master' into next

1 files changed, 9 insertions, 8 deletions

diff --git a/mm/swap_state.c b/mm/swap_state.c
index 1416e7e9e02..42cd38eba79 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -124,7 +124,6 @@ void __delete_from_swap_cache(struct page *page)
 /**
  * add_to_swap - allocate swap space for a page
  * @page: page we want to move to swap
- * @gfp_mask: memory allocation flags
  *
  * Allocate swap space for the page and add the page to the
  * swap cache.  Caller needs to hold the page lock. 
@@ -162,11 +161,11 @@ int add_to_swap(struct page *page)
 			return 1;
 		case -EEXIST:
 			/* Raced with "speculative" read_swap_cache_async */
-			swap_free(entry);
+			swapcache_free(entry, NULL);
 			continue;
 		default:
 			/* -ENOMEM radix-tree allocation failure */
-			swap_free(entry);
+			swapcache_free(entry, NULL);
 			return 0;
 		}
 	}
@@ -188,8 +187,7 @@ 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);
+	swapcache_free(entry, page);
 	page_cache_release(page);
 }
 
@@ -293,7 +291,10 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
 		/*
 		 * Swap entry may have been freed since our caller observed it.
 		 */
-		if (!swap_duplicate(entry))
+		err = swapcache_prepare(entry);
+		if (err == -EEXIST) /* seems racy */
+			continue;
+		if (err)           /* swp entry is obsolete ? */
 			break;
 
 		/*
@@ -312,12 +313,12 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
 			 * Initiate read into locked page and return.
 			 */
 			lru_cache_add_anon(new_page);
-			swap_readpage(NULL, new_page);
+			swap_readpage(new_page);
 			return new_page;
 		}
 		ClearPageSwapBacked(new_page);
 		__clear_page_locked(new_page);
-		swap_free(entry);
+		swapcache_free(entry, NULL);
 	} while (err != -ENOMEM);
 
 	if (new_page)