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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2008-03-04 14:28:32 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:10 -0800
commit10ed273f5016c582413dfbc468dd084957d847e1 (patch)
tree58f76f68e57866c4124dc09e956103e9093c8d32
parentd9d4fcfe515d7cece1b26decd75f5d41544a287b (diff)
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>
-rw-r--r--mm/page_alloc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8896e874a67d..e76cf94725c9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -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;
}