linux-kernel - Re: [PATCH 2/8] um: Do not use SUBARCH

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Date:	Thu, 26 Sep 2013 15:26:06 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Ramkumar Ramachandra <artagnon@...il.com>
Cc:	Richard Weinberger <richard@....at>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jeff Dike <jdike@...toit.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 2/8] um: Do not use SUBARCH

On Thu, Sep 26, 2013 at 3:13 PM, Ramkumar Ramachandra
<artagnon@...il.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?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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