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

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Message-ID: <20071116221535.GA1810@uranus.ravnborg.org>
Date:	Fri, 16 Nov 2007 23:15:35 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andreas Herrmann <aherrman@...or.de>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Kconfig: ARCH=x86 causes wrong utsname.machine

On Fri, Nov 16, 2007 at 07:20:15AM -0800, H. Peter Anvin wrote:
> 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.

Any good suggestions here???
UTS_MACHINE is set in top-level Makefile and if we specify
make ARCH=x86
we do not know if i386 or x86_&4 is correct until the configuration
has been read.

Should we report a "make ARCH=x86" as uname -m == x86??

	Sam
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