linux-kernel - Re: In many cases softlockup can not be reported after disabling IRQ for long time

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Message-ID: <4F291935.2030205@gmail.com>
Date:	Wed, 01 Feb 2012 18:51:33 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	TAO HU <tghk48@...orola.com>
CC:	Don Zickus <dzickus@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	linux-arm-kernel@...ts.infradead.org,
	linux-omap <linux-omap@...r.kernel.org>
Subject: Re: In many cases softlockup can not be reported after disabling
 IRQ for long time

(Please don't top-reply.)

On 02/01/2012 10:18 AM, TAO HU wrote:
> Hi, Don
>
> Thanks for your feedback!
>
> Unfortunately, the hardlockup depends on NMI which is not available on
> ARM (Cortex-A9) per my understanding.
> Our system uses OMAP4430. Any more suggestions?

When there is no NMI, touch_nmi_watchdog() actually touches softlockup 
watchdog:

#if defined(ARCH_HAS_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
#include <asm/nmi.h>
extern void touch_nmi_watchdog(void);
#else
static inline void touch_nmi_watchdog(void)
{
         touch_softlockup_watchdog();
}
#endif

so you need to check if other places calling touch_nmi_watchdog() 
especially on ARM.
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