[PATCH] kbuild: Enable building defconfigs from Kconfig files

Michal Marek mmarek at suse.cz
Wed Jul 14 06:22:52 EST 2010

On 07/13/2010 03:43 AM, Stephen Rothwell wrote:
> After this change, doing a "make xxx_defconfig" will check first for
> a file called arch/<arch>/configs/Kconfig.xxx and use that to generate
> the .config (effectively starting from an allnoconfig).  If that file
> doesn't exist, it will use arch/<ARCH>/configs/xxx_defconfig as now.
> Signed-off-by: Stephen Rothwell <sfr at canb.auug.org.au>
> ---
>  scripts/kconfig/Makefile |   14 +++++++++++++-
>  1 files changed, 13 insertions(+), 1 deletions(-)
> Hi Linus,
> Is this more the direction you want to take?
> There are still 2 main problems with is approach:
> 	- there are some config options that are globally and
> unconditionally enabled that some platforms may not want.  The only way
> currently to turn them off is to reproduce the config entry with the
> different default.  I am not sure if we need a wa to turn them off or to
> just change them to being neede to be selected by those that do want them.
> 	- we have no way to select options that are neither bool or
> tristate to suitable values.  Again the only way to do that currently is
> to reproduce the config entry with a different default value.

Hi Stephen,

how are these Kconfig.xxx files going look like? A list of 'select FOO'
 and 'include "Kconfig.other"' statements?

What about adding support for an include statement to the .config file
format and using that in the defconfigs instead? The VARIABLE=VALUE
grammar seems much more suitable for this than the kconfig language.


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