linux-kernel - Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI

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Date:	Mon, 20 Feb 2012 16:34:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine
 nested NMI


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 2012-02-20 at 09:10 +0100, Ingo Molnar wrote:
> > > 
> > > Note, it does not seem to cause any destruction, but screw up 
> > > profiling.
> > 
> > Except if the source of the NMI was not profiling, right?
> 
> Well, what else are NMIs used for? [...]

There's various (legacy) diagnostics NMIs on various x86 
platforms, mostly signalling some sort of deep trouble
with the hw.

Thanks,

	Ingo
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