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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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