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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 24 May 2011 14:30:41 -0700
Message-ID: <BANLkTi=BrrwL=gzn7H6O1rAGJpe=VPAQRQ@mail.gmail.com>
Subject: Re: [RFC 0/9] mce recovery for Sandy Bridge server
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tony Luck <tony.luck@intel.com>, Borislav Petkov <bp@amd64.org>,
        Ingo Molnar <mingo@elte.hu>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Huang, Ying" <ying.huang@intel.com>, Andi Kleen <andi@firstfloor.org>,
        Borislav Petkov <bp@alien8.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mauro Carvalho Chehab <mchehab@redhat.com>
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On Tue, May 24, 2011 at 2:24 PM, Peter Zijlstra <a.p.zijlstra@chello.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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