linux-kernel - [PATCH] softlockup: stop spurious softlockup messages due to overflow

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Date:	Mon, 15 Mar 2010 14:01:13 +0000
From:	Colin Ian King <colin.king@...onical.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] 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>
---
 kernel/softlockup.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 0d4c789..90d9aa0 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -111,10 +111,10 @@ int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
 void softlockup_tick(void)
 {
 	int this_cpu = smp_processor_id();
-	unsigned long touch_ts = per_cpu(softlockup_touch_ts, this_cpu);
+	unsigned long long touch_ts = per_cpu(softlockup_touch_ts, this_cpu);
 	unsigned long print_ts;
 	struct pt_regs *regs = get_irq_regs();
-	unsigned long now;
+	unsigned long long now;
 
 	/* Is detection switched off? */
 	if (!per_cpu(softlockup_watchdog, this_cpu) || softlockup_thresh <= 0) {
@@ -165,7 +165,7 @@ void softlockup_tick(void)
 	per_cpu(softlockup_print_ts, this_cpu) = touch_ts;
 
 	spin_lock(&print_lock);
-	printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
+	printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %llus! [%s:%d]\n",
 			this_cpu, now - touch_ts,
 			current->comm, task_pid_nr(current));
 	print_modules();
-- 
1.6.3.3

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