linux-kernel - [RFC 4/5] swap: Remove unnecessary page release

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Message-Id: <7b8f65cb0e08556bdb48c459cb1f72500f6aa61d.1292604746.git.minchan.kim@gmail.com>
Date:	Sat, 18 Dec 2010 02:13:39 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: [RFC 4/5] swap: Remove unnecessary page release

This patch series changes remove_from_page_cache's page ref counting
rule. page cache ref count is decreased in remove_from_page_cache.
So we don't need call again in caller context.

Cc:Hugh Dickins <hughd@...gle.com>
Cc: linux-mm@...ck.org
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/shmem.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index fa9acc9..16800f2 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1091,7 +1091,6 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
 		spin_unlock(&info->lock);
 		swap_shmem_alloc(swap);
 		BUG_ON(page_mapped(page));
-		page_cache_release(page);	/* pagecache ref */
 		swap_writepage(page, wbc);
 		if (inode) {
 			mutex_lock(&shmem_swaplist_mutex);
-- 
1.7.0.4

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