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

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Date:	Fri, 16 Nov 2007 13:37:47 +0100
From:	Andreas Herrmann <aherrman@...or.de>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Kconfig: ARCH=x86 causes wrong utsname.machine

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.

Several tools (e.g. the kernel build itself) will be confused
otherwise (*).

Regards,

Andreas

(*) Example:
$ uname -m
x66_64
$ make menuconfig
Makefile:425: /projects/linux-2.6-x86/arch/x66_64/Makefile: No such file or directory
make: *** No rule to make target `/projects/linux-2.6-x86/arch/x66_64/Makefile'.  Stop.

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