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

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Message-ID: <20080518121009.GK6948@cvg>
Date:	Sun, 18 May 2008 16:10:09 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Tom Spink <tspink@...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

[Tom Spink - Sun, May 18, 2008 at 01:07:37PM +0100]
| 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
| 

yes, I've already unified them so I use single form for both cases. I'll
send updated version on the week probably.

		- Cyrill -
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