linux-kernel - Re: [PATCH] x86, UV: Fix NMI handler for UV platforms

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Date:	Mon, 21 Mar 2011 20:55:21 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Jack Steiner <steiner@....com>
CC:	Ingo Molnar <mingo@...e.hu>, Don Zickus <dzickus@...hat.com>,
	tglx@...utronix.de, hpa@...or.com, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [PATCH] x86, UV: Fix NMI handler for UV platforms

On 03/21/2011 08:48 PM, Cyrill Gorcunov wrote:
...
>>>   Another option might be to add pre-nmi notifier chain, which of course
>>> not much differ from platform ops but I guess platform ops stands mostly
>>> for one-shot events while chain might be more flexible. Ie I mean something
>>> like
>>>
>>> 	if (notify_pre_die(DIE_NMI, "nmi", regs, 0, 2, SIGINT) == NOTIFY_STOP)
>>> 		return;
>>
>> You still need to process both chains in order to handle the case where both
>> hw_perf & the SGI BMC raise NMIs at about the same time.
>>
>> --- jack
> 
> yes, but I meant to simply call this chain before the regular notify_die. Anyway
> it would look ugly as hell too.
> 

And if I'm not missing something kgdb still might call IPI inside NMI handler
which is look somehow strange to me...

-- 
    Cyrill
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