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@xxxxxxxxxxxxxx>
CC: Lee Schermerhorn <Lee.Schermerhorn@xxxxxx>
CC: Paul Jackson <pj@xxxxxxx>
---
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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