[PATCH] remove SWAP_ERROR

From: Hugh Dickins <hugh@veritas.com>

Delete unused SWAP_ERROR and non-existent page_over_rsslimit().

include/linux/swap.h

@@ -177,13 +177,11 @@ struct pte_chain *FASTCALL(page_add_rmap(struct page *, pte_t *,
 					struct pte_chain *));
 void FASTCALL(page_remove_rmap(struct page *, pte_t *));
 int FASTCALL(try_to_unmap(struct page *));
-int FASTCALL(page_over_rsslimit(struct page *));
 
 /* return values of try_to_unmap */
 #define	SWAP_SUCCESS	0
 #define	SWAP_AGAIN	1
 #define	SWAP_FAIL	2
-#define	SWAP_ERROR	3
 
 /* linux/mm/shmem.c */
 extern int shmem_unuse(swp_entry_t entry, struct page *page);

mm/rmap.c

@@ -415,7 +415,6 @@ static int try_to_unmap_one(struct page * page, pte_addr_t paddr)
  * SWAP_SUCCESS	- we succeeded in removing all mappings
  * SWAP_AGAIN	- we missed a trylock, try again later
  * SWAP_FAIL	- the page is unswappable
- * SWAP_ERROR	- an error occurred
  */
 int try_to_unmap(struct page * page)
 {
@@ -483,9 +482,6 @@ int try_to_unmap(struct page * page)
 			case SWAP_FAIL:
 				ret = SWAP_FAIL;
 				goto out;
-			case SWAP_ERROR:
-				ret = SWAP_ERROR;
-				goto out;
 			}
 		}
 	}

mm/vmscan.c

@@ -284,7 +284,6 @@ shrink_list(struct list_head *page_list, unsigned int gfp_mask,
 		 */
 		if (page_mapped(page) && mapping) {
 			switch (try_to_unmap(page)) {
-			case SWAP_ERROR:
 			case SWAP_FAIL:
 				pte_chain_unlock(page);
 				goto activate_locked;