linux-kernel - Re: [RFC 0/9] mce recovery for Sandy Bridge server

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Message-ID: <BANLkTi=BrrwL=gzn7H6O1rAGJpe=VPAQRQ@mail.gmail.com>
Date:	Tue, 24 May 2011 14:30:41 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...64.org>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [RFC 0/9] mce recovery for Sandy Bridge server

On Tue, May 24, 2011 at 2:24 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> Right, so you can't do things like that from NMI context, but what perf
> can do is raise a self-IPI and continue from IRQ context (question for
> the HW folks, can there be cycles between the NMI iret and IRQ assert
> from whatever context was before the NMI hit?)

Of course there can be - the code where the NMI hit may have
interrupts disabled.

                                Linus
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