linux-kernel - Re: ARM defconfig files

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Date:	Sat, 5 Jun 2010 16:47:50 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Russell King <rmk@....linux.org.uk>,
	Daniel Walker <dwalker@...eaurora.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: ARM defconfig files

On Thu, Jun 3, 2010 at 11:31 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, 3 Jun 2010, Linus Torvalds wrote:
>>
>> I apparently haven't explained myself enough, because what you keep on
>> harping on is not something I consider acceptable.
>>
>> STD_CONFIG is pointless. It's pointless because the solution to what
>> you call STD_CONFIG would be to just NOT USING the special Kconfig.xyz
>> file at all.
>
> To make this _really_ concrete, let me actually give you an example (but
> broken and pointless) example Kconfig file, in order to _avoid_ having a
> def_config file.
>
> I do it by generating it. Let's say that I want a x86 configuration that
> has USB enabled. I can basically _ask_ the Kconfig machinery to generate
> that with something like this:
>
>  - create a "Mykconfig" file:
>
>        config MYCONFIG
>                bool
>                default y
>                select USB
>
>        source arch/x86/Kconfig
>
> and then I just do
>
>        KBUILD_KCONFIG=Mykconfig make allnoconfig
>
> and look what appears in the .config file. In fact, do this:
>
>        make allnoconfig
>        cp .config no-config
>        KBUILD_KCONFIG=Mykconfig make allnoconfig
>        cp .config my-config
>        diff -u no-config my-config
>
> to see the point of it all.
>
> Now, the above is a _trivial_ one. And it's actually broken, because I
> should not have forced CONFIG_USB (it depends on CONFIG_USB_SUPPORT).

And that's precisely the problem that his approach doesn't solve: dependencies.

---
config MYCONFIG
	bool
	default y
	select MACH_OMAP3_BEAGLE

source arch/arm/Kconfig
---

Is the same as:
---
source arch/arm/Kconfig
---

With the SAT resolver it would be possible to have a .satconfig:
CONFIG_MACH_OMAP3_BEAGLE=y

And let the resolver figure everything out back from there.

-- 
Felipe Contreras
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