linux-kernel - Re: [PATCH 1/2] arch/um: make it work with defconfig and x86

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Date:	Fri, 27 Sep 2013 07:41:33 +0200
From:	Richard Weinberger <richard@....at>
To:	Ramkumar Ramachandra <artagnon@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, Michal Marek <mmarek@...e.cz>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	Jeff Dike <jdike@...toit.com>
Subject: Re: [PATCH 1/2] arch/um: make it work with defconfig and x86_64

Am 27.09.2013 06:14, schrieb Ramkumar Ramachandra:
> arch/um/defconfig only lists one default configuration, and that applies
> only to the i386 architecture.  Replace it with two minimal
> configuration files generated using `make savedefconfig`:
> 
>   i386_defconfig and x86_64_defconfig
> 
> The build scripts now require two updates:
> 
> 1. um's Kconfig (arch/x86/um/Kconfig) should specify an ARCH_DEFCONFIG
>    section explicitly pointing to these scripts if the required
>    variables are set.  Take care to remove the DEFCONFIG_LIST section
>    defined in the included file arch/um/Kconfig.common.
> 
> 2. um's Makefile (arch/um/Makefile) should set KBUILD_DEFCONFIG properly
>    for the top-level Makefile to pick up.  Copy the logic in
>    arch/x86/Makefile to properly pick the defconfig file depending on
>    the actual architecture; except we're working with $SUBARCH here,
>    instead of $ARCH.
> 
> Now, you can do:
> 
>   $ ARCH=um make defconfig
>   $ ARCH=um make
> 
> and successfully build User-Mode Linux on an x86_64 box in default
> configuration.

I don't much like the commit message, but I will amend it myself.
I.e. defconfig worked always on x86_64, you have to specify SUBARCH=x86_64.
Your patch adds the handy feature that make defconfig will use the host arch
automatically.

Patch queued for 3.13-rc1.

Thanks,
//richard
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