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

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Message-ID: <CALkWK0kcd03t9W4O24wiVBQ8SZQ8ZcrbvQaUkcCm+y5n=d1wPw@mail.gmail.com>
Date:	Thu, 26 Sep 2013 20:06:01 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	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

Richard Weinberger wrote:
>> 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.

This is an insane expectation. This is kernel convention (it has
nothing to do with uml):

SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
 -e s/sun4u/sparc64/ \
 -e s/arm.*/arm/ -e s/sa110/arm/ \
 -e s/s390x/s390/ -e s/parisc64/parisc/ \
 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )

config 64BIT
bool "64-bit kernel" if ARCH = "x86"
default ARCH != "i386"
---help---
 Say yes to build a 64-bit kernel - formerly known as x86_64
 Say no to build a 32-bit kernel - formerly known as i386

If you want to stand on your head and demand that all these
conventions be changed against all reason, I have nothing further to
say.
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