linux-kernel - [PATCH 3/7] fs/buffer.c: change type of max_buffer

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Date:	Wed, 06 Feb 2013 13:17:21 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>, mgorman@...e.de,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com
CC:	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/7] fs/buffer.c: change type of max_buffer_heads to unsigned
 long

max_buffer_heads is calculated from nr_free_buffer_pages(), so
change its type to unsigned long in case of overflow.

Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 fs/buffer.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 7a75c3e..3eb675b 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3227,7 +3227,7 @@ static struct kmem_cache *bh_cachep __read_mostly;
  * Once the number of bh's in the machine exceeds this level, we start
  * stripping them in writeback.
  */
-static int max_buffer_heads;
+static unsigned long max_buffer_heads;
 
 int buffer_heads_over_limit;
 
@@ -3343,7 +3343,7 @@ EXPORT_SYMBOL(bh_submit_read);
 
 void __init buffer_init(void)
 {
-	int nrpages;
+	unsigned long nrpages;
 
 	bh_cachep = kmem_cache_create("buffer_head",
 			sizeof(struct buffer_head), 0,
-- 
1.7.1

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