[PATCH][mmtom] remove file arguement of swap_readpage

[Minchan Kim]

The file argument resulted from address_space's readpage
long time ago.

Now we don't use it any more. Let's remove unnecessary
argement.

This patch cleans up swap_readpage.
It doesn't affect behavior of function.

Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx>
Cc: Hugh Dickins <hugh.dickins@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
---
 include/linux/swap.h |    2 +-
 mm/page_io.c         |    2 +-
 mm/swap_state.c      |    2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 2dedc2d..c88b366 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -256,7 +256,7 @@ extern void swap_unplug_io_fn(struct backing_dev_info *, struct page *);
 
 #ifdef CONFIG_SWAP
 /* linux/mm/page_io.c */
-extern int swap_readpage(struct file *, struct page *);
+extern int swap_readpage(struct page *);
 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
 extern void end_swap_bio_read(struct bio *bio, int err);
 
diff --git a/mm/page_io.c b/mm/page_io.c
index 3023c47..c6f3e50 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -120,7 +120,7 @@ out:
 	return ret;
 }
 
-int swap_readpage(struct file *file, struct page *page)
+int swap_readpage(struct page *page)
 {
 	struct bio *bio;
 	int ret = 0;
diff --git a/mm/swap_state.c b/mm/swap_state.c
index b62e7f5..42cd38e 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -313,7 +313,7 @@ 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);
-- 
1.5.6.5

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