linux-kernel - Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI

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Date:	Wed, 01 Dec 2010 19:53:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>, ying.huang@...el.com,
	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] x86, NMI: Remove DIE_NMI_IPI and add priorties to
 handlers

On Wed, 2010-12-01 at 21:41 +0300, Cyrill Gorcunov wrote:
> On Tue, Nov 30, 2010 at 05:27:25PM -0500, Don Zickus wrote:
> > When re-ordering how the NMI handles its callbacks, a conversation started
> > asking what DIE_NMI_IPI meant.  No one could answer it.
> 
> It should have came from commit
> 
>  | commit c4b2bffee2a4115fed2825530f2b906ee2f17bd7
>  | Author: Andi Kleen <ak@...e.de>
>  | Date:   Fri Jan 23 18:46:40 2004 -0800
>  |
>  |   [PATCH] x86-64 merge
>  |   
>  |   Mainly lots of bug fixes and a few minor features. One change is that
>  |   it uses drivers/Kconfig now like i386. This requires a few minor changes in
>  |   outside Kconfig files which I am sending separately.
>  ...
> 
> Andi do you remember what the initial idea was? Didn't find any user of it
> even in this old commit. Just curious.
> 
> > 
> > Noticing that is was wasteful to call the die_chain a second time with just
> > another argument, DIE_NMI_IPI, it was decided to nuke it and add priorities
> > to the die_chain handlers to maintain existing behaviour.
> > 
> > This patch replaces DIE_NMI_IPI with the appropriate option, mostly DIE_NMI.
> > Then it adds priorities to those handlers, using a globally defined set of
> > priorities for NMI.
> > 
> > The thought is eventually we will just switch the nmi handlers from the
> > die_chain to something more nmi specific.
> > 
> > Signed-off-by: Don Zickus <dzickus@...hat.com>
> > ---
> 
>  Don, maybe switching to say new chains like chain_perf and friends would be
> more readable/clean? I'm not against this patch by any means, but just a thought ;)

Its a single event (NMI) so we only need a single notifier list, the
current one seems to be just fine.

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