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 09:07:47 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH][GIT PULL][v3.3] x86: Test saved %rip in NMI to determine nested NMI

Not even all that legacy.

Ingo Molnar <mingo@...e.hu> wrote:

>
>* 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

-- 
Sent from my mobile phone. Please excuse my brevity and lack of formatting.
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