linux-kernel - RE: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option

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Message-ID: <04EAB7311EE43145B2D3536183D1A844549C18A9@GSjpTKYDCembx31.service.hitachi.net>
Date:	Fri, 16 Oct 2015 02:02:06 +0000
From:	河合英宏 / KAWAI，HIDEHIRO 
	<hidehiro.kawai.ez@...achi.com>
To:	"'Thomas Gleixner'" <tglx@...utronix.de>
CC:	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
Subject: RE: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option

> > By the way, I have a pending patch which expands this option like
> > this:
> >
> > 	apic_extnmi={ bsp | all | none }
> >
> > If apic_extnmi=all is specified, external NMIs are broadcast to
> > all CPUs.  This raises the successful rate of kernel panic in the case
> > where an external NMI to CPU 0 is swallowed by other NMI handlers or
> > blocked due to hang-up in NMI context.  The patch works without any
> > problems, but I'm going to drop the feature if it will cause long
> > discussion.  I'd like to settle this patch set down once.  At least,
> > I'm going to change this option to apic_extnmi={bsp|none} style for
> > the future expansion.
> >
> > How do you think about this?
> 
> Do it right away with all three variants. They make a lot of sense to
> me.

OK. I'll do that.

Regards,

--
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group