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Re: [RFC] Get rid of SUBARCH

To: Richard Weinberger <>
Subject: Re: [RFC] Get rid of SUBARCH
From: Geert Uytterhoeven <>
Date: Wed, 21 Aug 2013 14:07:33 +0200
Cc: Linux-Arch <>, Michal Marek <>, Ralf Baechle <>, Paul Mundt <>, Jeff Dike <>, Guan Xuetao <>, Thomas Gleixner <>, Ingo Molnar <>, "H. Peter Anvin" <>, "the arch/x86 maintainers" <>, linux-kbuild <>, "" <>, linux-m68k <>, Linux MIPS Mailing List <>, Linux-sh list <>, uml-devel <>
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On Wed, Aug 21, 2013 at 10:19 AM, Richard Weinberger <> 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



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

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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