linux-kernel - [tip:core/urgent] softlockup: Stop spurious softlockup messages due to overflow

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Message-ID: <tip-8c2eb4805d422bdbf60ba00ff233c794d23c3c00@git.kernel.org>
Date:	Mon, 22 Mar 2010 07:45:51 GMT
From:	tip-bot for Colin Ian King <colin.king@...onical.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	eric.dumazet@...il.com, a.p.zijlstra@...llo.nl, stable@...nel.org,
	colin.king@...onical.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/urgent] softlockup: Stop spurious softlockup messages due to overflow

Commit-ID:  8c2eb4805d422bdbf60ba00ff233c794d23c3c00
Gitweb:     http://git.kernel.org/tip/8c2eb4805d422bdbf60ba00ff233c794d23c3c00
Author:     Colin Ian King <colin.king@...onical.com>
AuthorDate: Fri, 19 Mar 2010 10:28:02 +0000
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 21 Mar 2010 19:30:13 +0100

softlockup: Stop spurious softlockup messages due to overflow

Ensure additions on touch_ts do not overflow.  This can occur
when the top 32 bits of the TSC reach 0xffffffff causing
additions to touch_ts to overflow and this in turn generates
spurious softlockup warnings.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: <stable@...nel.org>
LKML-Reference: <1268994482.1798.6.camel@...ovo>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/softlockup.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 0d4c789..4b493f6 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -155,11 +155,11 @@ void softlockup_tick(void)
 	 * Wake up the high-prio watchdog task twice per
 	 * threshold timespan.
 	 */
-	if (now > touch_ts + softlockup_thresh/2)
+	if (time_after(now - softlockup_thresh/2, touch_ts))
 		wake_up_process(per_cpu(softlockup_watchdog, this_cpu));
 
 	/* Warn about unreasonable delays: */
-	if (now <= (touch_ts + softlockup_thresh))
+	if (time_before_eq(now - softlockup_thresh, touch_ts))
 		return;
 
 	per_cpu(softlockup_print_ts, this_cpu) = touch_ts;
--
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