linux-kernel - Re: [PATCH 1/2] watchdog, hpwdt: Remove priority option for NMI callback

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Message-ID: <20120309181404.GK24378@redhat.com>
Date:	Fri, 9 Mar 2012 13:14:04 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	"Mingarelli, Thomas" <Thomas.Mingarelli@...com>
Cc:	"x86@...nel.org" <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: Re: [PATCH 1/2] watchdog, hpwdt: Remove priority option for NMI
 callback

On Fri, Mar 09, 2012 at 05:28:15PM +0000, Mingarelli, Thomas wrote:
> Can I register for more than one type? Like NMI_UNKNOWN | NMI_DIE (or something like that)?

There are only two queues, NMI_LOCAL and NMI_UNKNOWN.  The difference is
NMI_LOCAL has handlers that can determine if they are the NMI source,
which is needed because _every_ handler is executed on every NMI.
NMI_UNKNOWN is reserved for handlers that just assume the NMI is theirs.

Cheers,
Don
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