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Date:   Thu, 26 Sep 2013 16:24:44 +0200
From:   Richard Weinberger <richard@nod.at>
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To:     Geert Uytterhoeven <geert@linux-m68k.org>
CC:     Ramkumar Ramachandra <artagnon@gmail.com>,
        Linux-Arch <linux-arch@vger.kernel.org>,
        Michal Marek <mmarek@suse.cz>,
        Ralf Baechle <ralf@linux-mips.org>,
        Paul Mundt <lethal@linux-sh.org>,
        Jeff Dike <jdike@addtoit.com>,
        Guan Xuetao <gxt@mprc.pku.edu.cn>,
        Thomas Gleixner <tglx@linutronix.de>,
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Subject: Re: [PATCH 2/8] um: Do not use SUBARCH
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Am 26.09.2013 15:26, schrieb Geert Uytterhoeven:
> On Thu, Sep 26, 2013 at 3:13 PM, Ramkumar Ramachandra
> <artagnon@gmail.com> wrote:
>> Ramkumar Ramachandra wrote:
>>> Richard Weinberger wrote:
>>>> I told you already that "make defconfig ARCH=um SUBARCH=x86" will spuriously
>>>> create a x86_64 config on x86_64.
>>>> This breaks existing setups.
>>>
>>> I'll fix this and resubmit soon.
>>
>> Wait a minute. You're now arguing about whether the generic "x86"
>> means i386 or x86_64. Its meaning is already defined in
>> arch/x86/Kconfig and arch/x86/um/Kconfig: see the config 64BIT. Unless
>> i386 is explicitly specified, the default is to build a 64-bit kernel.
>> That is already defined for a normal Linux kernel, and user-mode Linux
>> should not break that convention. So, in the example you pulled out of
>> your hat:
>>
>>   $ make defconfig ARCH=um SUBARCH=x86
>>
>> the user should expect a 64-bit build, and not an i386 build as you
>> say. Both my patches are correct, and the "regression" that you
>> pointed out is a red herring.
> 
> Sorry for chiming in, but... what about cross compiling?
> SUBARCH=x86 should give you a 32-bit ia32 kernel, right?

Correct.
Users expect from SUBARCH=x86 a i386 32bit UML kernel.

Thanks,
//richard