linux-kernel - Re: how can I touch softlockup watchdog on all cpus?

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Date:	Thu, 22 Mar 2007 21:16:17 -0400
From:	Dave Jones <davej@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"Cestonaro, Thilo (external)" 
	<Thilo.Cestonaro.external@...itsu-siemens.com>,
	Lee Revell <rlrevell@...-job.com>, linux-kernel@...r.kernel.org
Subject: Re: how can I touch softlockup watchdog on all cpus?

On Thu, Mar 22, 2007 at 03:46:54PM -0700, Jeremy Fitzhardinge wrote:
 > Cestonaro, Thilo (external) wrote:
 > > It's a condition of a customer of us, so I can't change it.
 > >
 > > But it happens not often that my part is used. So I thought there is a mechanism to disable or reset the watchdog
 > > because it is a legal pause for it. And there is one "touch_softlockup_watchdog()", that does what I want,
 > > BUT just for the current cpu. And so the watchdog blats from the other cpu.
 > >   
 > 
 > on_each_cpu(touch_softlockup_watchdog, NULL, 0, 0)?

He wants to do this with interrupts off. on_each_cpu won't work in
that situation.

 > Or patch the softlockup watchdog to add a way to temporarily disable it.

Seems pretty much the only way you could make this work.

	Dave

-- 
http://www.codemonkey.org.uk
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