linux-kernel - [-mm][PATCH 1/5] fix overflow problem of do_try_to_free

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Message-Id: <20080504215331.8F55.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Sun, 04 May 2008 21:55:57 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [-mm][PATCH 1/5] fix overflow problem of do_try_to_free_page()

this patch is not part of reclaim throttle series.
it is merely hotfixs.

---------------------------------------
"Smarter retry of costly-order allocations" patch series change 
behaver of do_try_to_free_pages().
but unfortunately ret variable type unchanged.

thus, overflow problem is possible.



Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Nishanth Aravamudan <nacc@...ibm.com>

---
 mm/vmscan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c	2008-05-03 00:02:52.000000000 +0900
+++ b/mm/vmscan.c	2008-05-03 00:05:08.000000000 +0900
@@ -1317,7 +1317,7 @@ static unsigned long do_try_to_free_page
 					struct scan_control *sc)
 {
 	int priority;
-	int ret = 0;
+	unsigned long ret = 0;
 	unsigned long total_scanned = 0;
 	unsigned long nr_reclaimed = 0;
 	struct reclaim_state *reclaim_state = current->reclaim_state;


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