linux-kernel - Re: Kconfig: ARCH=x86 causes wrong utsname.machine

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Date:	Fri, 16 Nov 2007 07:20:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andreas Herrmann <aherrman@...or.de>
CC:	Sam Ravnborg <sam@...nborg.org>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Kconfig: ARCH=x86 causes wrong utsname.machine

Andreas Herrmann wrote:
> The new ARCH=x86 kernel build causes weired machine strings on 32-bit.
> For a cross-compiled kernel I have
> 
> 	 $ uname -m
> 	 x66_64
> 
> For a kernel natively built on a 32 bit machine I have
> 
> 	$ uname -m  
> 	x66
> 
> Looking at the sources, I think that utsname->machine was initially
> set as "x86_64" and "x86", respectively.
> But in arch/x86/kernel/cpu/bugs.c in check_bugs() the second character
> is set to '6' on my K7.
> 
> I think the right solution for that problem is to use "x86_64" as the
> machine name for 64-bit and to keep the old "i[3456]86" strings for
> 32-bit kernels.

Absolutely.  This would be userspace-visible ABI breakage.

	-hpa
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