Date: Sat, 17 Jul 2010 00:41:40 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>, Avi Kivity <avi@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Steven Rostedt <rostedt@rostedt.homelinux.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>, Christoph Hellwig <hch@lst.de>,
        Li Zefan <lizf@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Tom Zanussi <tzanussi@gmail.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Jeremy Fitzhardinge <jeremy@goop.org>,
        "Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault
Message-ID: <20100716224140.GI7338@basil.fritz.box>
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On Fri, Jul 16, 2010 at 03:26:32PM -0700, Linus Torvalds wrote:
> On Fri, Jul 16, 2010 at 3:07 PM, Andi Kleen <andi@firstfloor.org> wrote:
> >
> > One issue I have with nesting NMIs is that you need
> > a nesting limit, otherwise you'll overflow the NMI stack.
> 
> Have you actually looked at the suggestion I (and now Mathieu)
> suggested code for?

Maybe I'm misunderstanding everything (and it has been a lot of emails
in the thread), but the case I was thinking of would be if the second NMI 
faults too, and then another one comes in after the IRET etc.

-Andi
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