linux-kernel - Re: [RFC] x86: merge nmi

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Date:	Sun, 18 May 2008 13:07:37 +0100
From:	"Tom Spink" <tspink@...il.com>
To:	"Cyrill Gorcunov" <gorcunov@...il.com>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	"Ingo Molnar" <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Jiri Slaby" <jirislaby@...il.com>,
	"Sam Ravnborg" <sam@...nborg.org>
Subject: Re: [RFC] x86: merge nmi_32-64 to nmi.c

2008/5/18 Cyrill Gorcunov <gorcunov@...il.com>:
> [Andi Kleen - Sun, May 18, 2008 at 12:25:42PM +0200]
> | Cyrill Gorcunov wrote:
> |
> | > yes, but what to do with absence of __nmi_count on 32bit and die_nmi
> | > uses different number of args? gcc follows both pathes anyway trying
> | > to evaluate where I prefer it would not... I mean I've got errors
> | > on compiling procedue 'cause of different number of args for die_nmi
> | > used in 32bit mode. That is why I've asked Thomas if it possible to
> | > add "panic" boot option for 32bit mode and make it familiar with 64bit
> | > mode and merge them eventually.
> |
> | Sorry just pointed out why the Kconfig idea doesn't work, nothing more.
> |
> | If you want to avoid ifdefs then you have to unify the functionality
> | first. Putting syntactical sugar on ifdefs doesn't make sense.
> |
> | I haven't kept track of the exact state of the code, but if the per cpu
> | data macros are finally as efficient as the PDA you could move the
> | nmi_count to per_cpu in both for once.
> |
> | -Andi
> |
>
> ok, thanks
>
>                - Cyrill -
>

It looks, though, that the unification of traps_{32,64}.c might help
eliminate some of these conditionals.  After a quick glance, at the
traps source, certainly the __die_nmi helper might even be eliminated.

-- 
Regards,
Tom Spink
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