linux-kernel - Re: [PATCH -v3 3/6] x86, NMI, Rewrite NMI handler

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Message-ID: <1286813635.2336.617.camel@twins>
Date:	Mon, 11 Oct 2010 18:13:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>
Subject: Re: [PATCH -v3 3/6] x86, NMI, Rewrite NMI handler

On Sat, 2010-10-09 at 14:49 +0800, Huang Ying wrote:
> notify_die(DIE_NMI_IPI);
> notify_die(DIE_NMI);
> /* process io port 0x61 */
> nmi_watchdog_touch();
> unknown_nmi(); 

Why keep NMI_IPI? What the heck is it for?

I'd like to see:

 DIE_NMI
 DIE_NMI_UNKNOWN

In DIE_NMI we walk the chain and deal with NMIs, in DIE_NMI_UNKNOWN we
try to consume extra NMIs where possible (like the much discussed extra
PMU interrupts).


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