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

To: Geert Uytterhoeven <geert@linux-m68k.org>, Ramkumar Ramachandra <artagnon@gmail.com>
Subject: Re: [PATCH 2/8] um: Do not use SUBARCH
From: Richard Weinberger <richard@nod.at>
Date: Thu, 26 Sep 2013 15:56:07 +0200
Cc: 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>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, linux-kbuild <linux-kbuild@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>, linux-m68k <linux-m68k@lists.linux-m68k.org>, Linux MIPS Mailing List <linux-mips@linux-mips.org>, Linux-sh list <linux-sh@vger.kernel.org>, uml-devel <user-mode-linux-devel@lists.sourceforge.net>
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Correct. Users expect Form SUBARCH=x86 a 32bit kernel.



Geert Uytterhoeven <geert@linux-m68k.org> schrieb:
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?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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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