linux-kernel - Re: [RFC] Get rid of SUBARCH

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Message-ID: <CAMuHMdWk-EPTNmPB1O1+F7YVQLjhQsFJznYwA3t6UCGUU1T9PQ@mail.gmail.com>
Date:	Wed, 21 Aug 2013 14:07:33 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Richard Weinberger <richard@....at>
Cc:	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>,
	"linux-kernel@...r.kernel.org" <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: [RFC] Get rid of SUBARCH

On Wed, Aug 21, 2013 at 10:19 AM, Richard Weinberger <richard@....at> wrote:
> This series is an attempt to remove the SUBARCH make parameter.
> It as introduced at the times of Linux 2.5 for UML to tell the UML
> build system what the real architecture is.
>
> But we actually don't need SUBARCH, we can store this information
> in the .config file.

Haha, now you have OS_ARCH (shouldn't that be called HOST_ARCH?) instead,
which is available only for UM?

> The series touches also m68k, sh, mips and unicore32.
> These architectures magically select a cross compiler if ARCH != SUBARCH.
> Do really need that behavior?

This does remove functionality.
It allows to build a kernel using e.g. "make ARCH=m68k".

Perhaps this can be moved to generic code? Most (not all!) cross-toolchains
are called $ARCH-{unknown-,}linux{,-gnu}.
Exceptions are e.g. am33_2.0-linux and bfin-uclinux.

> [PATCH 1/8] um: Create defconfigs for i386 and x86_64
> [PATCH 3/8] um: Remove old defconfig

Why not merge these two, so git copy/rename detection will show only the real
changes?

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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