linux-kernel - [PATCH] NMI: fix watchdog failure message

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Message-ID: <20080815123610.GU7154@redhat.com>
Date:	Fri, 15 Aug 2008 08:36:14 -0400
From:	Aristeu Rozanski <arozansk@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, jvillalo@...hat.com
Subject: [PATCH] NMI: fix watchdog failure message

> it just won't work at boot time - the second logic unit will be stuck:
> 
> Booting processor 1/2 APIC 0x1
> Initializing CPU#1
> Calibrating delay using timer specific routine.. 5586.12 BogoMIPS (lpj=2793063)
> CPU: Trace cache: 12K uops, L1 D cache: 16K
> CPU: L2 cache: 1024K
> CPU: Physical Processor ID: 0
> CPU: Processor Core ID: 1
> CPU1: Thermal monitoring enabled (TM1)
>               Intel(R) Pentium(R) D CPU 2.80GHz stepping 04
> Brought up 2 CPUs
> testing NMI watchdog ... <4>WARNING: CPU#1: NMI appears to be stuck (0->0)!
while at it...

Signed-off-by: Aristeu Rozanski <aris@...hat.com>

---
 arch/x86/kernel/nmi.c |    4 ++++
 1 file changed, 4 insertions(+)

--- linus-2.6.orig/arch/x86/kernel/nmi.c	2008-08-12 11:13:35.000000000 -0400
+++ linus-2.6/arch/x86/kernel/nmi.c	2008-08-15 08:33:57.000000000 -0400
@@ -142,11 +142,15 @@ int __init check_nmi_watchdog(void)
 		if (!per_cpu(wd_enabled, cpu))
 			continue;
 		if (get_nmi_count(cpu) - prev_nmi_count[cpu] <= 5) {
+			printk("\n");
 			printk(KERN_WARNING "WARNING: CPU#%d: NMI "
 				"appears to be stuck (%d->%d)!\n",
 				cpu,
 				prev_nmi_count[cpu],
 				get_nmi_count(cpu));
+			printk(KERN_WARNING "Please report this to "
+			       "linux-kernel@...r.kernel.org and attach "
+			       "the output of 'dmesg' command.\n");
 			per_cpu(wd_enabled, cpu) = 0;
 			atomic_dec(&nmi_active);
 		}
--
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