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SubjectRe: [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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