linux-kernel - Re: [PATCH 1/1] [x86] Configuration options to compile out x86 CPU support code

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Message-ID: <20080815141855.GB12954@elte.hu>
Date:	Fri, 15 Aug 2008 16:18:55 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	michael@...e-electrons.com
Subject: Re: [PATCH 1/1] [x86] Configuration options to compile out x86 CPU
	support code


* Thomas Petazzoni <thomas.petazzoni@...e-electrons.com> wrote:

> This patch adds some configuration options that allow to compile out 
> CPU vendor-specific code in x86 kernels (in arch/x86/kernel/cpu). The 
> new configuration options are only visible when CONFIG_EMBEDDED is 
> selected, as they are mostly interesting for space savings reasons.
> 
> An example of size saving, on x86 with only Intel CPU support:
> 
>    text	   data	    bss	    dec	    hex	filename
> 1125479	 118760	 212992	1457231	 163c4f	vmlinux.old
> 1121355	 116536	 212992	1450883	 162383	vmlinux
>   -4124   -2224       0   -6348   -18CC +/-
> 
> However, I'm not exactly sure that the Kconfig wording is correct with 
> regard to !64BIT / 64BIT.

applied to tip/x86/cpu, thanks Thomas. (I've done a trivial cleanup: 
converted the macro to an inline.)

Peter, do you like this version of the patch or would you like further 
improvements?

	Ingo
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