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zlc_setup(): handle jiffies wraparound 

jiffies subtraction may cause an overflow problem.  It should be using
time_after().

[akpm@linux-foundation.org: include jiffies.h]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2008-03-04 14:28:32 -08:00 committed by Linus Torvalds
parent d9d4fcfe51
commit 10ed273f50
1 changed files with 2 additions and 1 deletions
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3
mm/page_alloc.c
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@ -19,6 +19,7 @@
#include <linux/swap.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/jiffies.h>
#include <linux/bootmem.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
@ -1276,7 +1277,7 @@ static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags)
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;
}