linux-kernel - trivial clean up to zlc

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Message-Id: <20080229151057.66ED.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 29 Feb 2008 15:19:39 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Paul Jackson <pj@....com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: trivial clean up to zlc_setup

Hi

I found very small bug during review mel's 2 zonelist patch series.

this patch is trivial clean up.
jiffies subtraction may cause overflow problem.
it shold be used time_after().

Thanks.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Lee Schermerhorn <Lee.Schermerhorn@...com>
CC: Paul Jackson <pj@....com>
---
 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: b/mm/page_alloc.c
===================================================================
--- a/mm/page_alloc.c   2008-02-18 17:17:25.000000000 +0900
+++ b/mm/page_alloc.c   2008-02-29 15:17:03.000000000 +0900
@@ -1294,7 +1294,7 @@ static nodemask_t *zlc_setup(struct zone
        if (!zlc)
                return NULL;

-       if (jiffies - zlc->last_full_zap > 1 * HZ) {
+       if (time_after(jiffies, zlc->last_full_zap + HZ)) {
                bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
                zlc->last_full_zap = jiffies;
        }





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