linux-kernel - [PATCH 7/7] Fix the case of jiffies wrapping in mm/pdflush.c

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Date:	Tue, 01 Jul 2008 11:57:04 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, hirofumi@...l.parknet.co.jp
Subject: [PATCH 7/7] Fix the case of jiffies wrapping in mm/pdflush.c



Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
---

 mm/pdflush.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN mm/pdflush.c~pdfluh-jiffies-check-fix mm/pdflush.c
--- linux-2.6/mm/pdflush.c~pdfluh-jiffies-check-fix	2008-07-01 10:19:07.000000000 +0900
+++ linux-2.6-hirofumi/mm/pdflush.c	2008-07-01 10:19:07.000000000 +0900
@@ -130,7 +130,7 @@ static int __pdflush(struct pdflush_work
 		 * Thread creation: For how long have there been zero
 		 * available threads?
 		 */
-		if (jiffies - last_empty_jifs > 1 * HZ) {
+		if (time_after(jiffies, last_empty_jifs + 1 * HZ)) {
 			/* unlocked list_empty() test is OK here */
 			if (list_empty(&pdflush_list)) {
 				/* unlocked test is OK here */
@@ -151,7 +151,7 @@ static int __pdflush(struct pdflush_work
 		if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS)
 			continue;
 		pdf = list_entry(pdflush_list.prev, struct pdflush_work, list);
-		if (jiffies - pdf->when_i_went_to_sleep > 1 * HZ) {
+		if (time_after(jiffies, pdf->when_i_went_to_sleep + 1 * HZ)) {
 			/* Limit exit rate */
 			pdf->when_i_went_to_sleep = jiffies;
 			break;					/* exeunt */
_
--
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