linux-kernel - [PATCH] fs/buffer.c: use lowmem_page_address instead of page

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Date:	Tue, 13 Aug 2013 11:37:55 +0900
From:	Heesub Shin <heesub.shin@...sung.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Heesub Shin <heesub.shin@...sung.com>,
	Dongjun Shin <d.j.shin@...sung.com>
Subject: [PATCH] fs/buffer.c: use lowmem_page_address instead of page_address

Here, the page has been identified as lowmem already. So, calling
lowmem_page_address() directly is a little cheaper than page_address().

Signed-off-by: Heesub Shin <heesub.shin@...sung.com>
Cc: Dongjun Shin <d.j.shin@...sung.com>
---
 fs/buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 695eb14..ccc2c7b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1464,7 +1464,7 @@ void set_bh_page(struct buffer_head *bh,
 		 */
 		bh->b_data = (char *)(0 + offset);
 	else
-		bh->b_data = page_address(page) + offset;
+		bh->b_data = lowmem_page_address(page) + offset;
 }
 EXPORT_SYMBOL(set_bh_page);
 
-- 
1.8.3.2

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