linux-kernel - Re: Possible hang inside interrupt handler on sata

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Date:	Thu, 13 Sep 2007 18:20:45 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Robin Holt <holt@....com>
cc:	Chuck Ebbert <cebbert@...hat.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org
Subject: Re: Possible hang inside interrupt handler on sata_promise.

On Thu, 13 Sep 2007, Robin Holt wrote:

> Is there any way on typical motherboards to send an NMI?  On Altix boxes,
> we can use the system controller to send an NMI.  I have found some
> motherboards appear to have an NMI line.  Is there anything like that
> on i386?  Maybe I am missing the issue entirely.  Does deadlock inside
> an IRQ handler seem plausible?

 There are various ways possible to send an NMI on a typical i386 box of 
these days; the easiest is probably the NMI watchdog -- see the 
"nmi_watchdog" kernel option.

  Maciej
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