linux-kernel - Re: [RFC PATCH] Kconfig: Enable Kconfig fragments to be used for defconfig

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Message-ID: <AANLkTilSHe2KD-2LJeUZp-I30LgfjCCPuJnObVzG4Bzo@mail.gmail.com>
Date:	Fri, 16 Jul 2010 12:52:29 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Nicolas Pitre <nico@...xnic.net>,
	Catalin Marinas <catalin.marinas@....com>,
	linuxppc-dev@...ts.ozlabs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tony Lindgren <tony@...mide.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [RFC PATCH] Kconfig: Enable Kconfig fragments to be used for 
	defconfig

On Fri, Jul 16, 2010 at 12:30 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Jul 16, 2010 at 02:19:31PM -0400, Nicolas Pitre wrote:
>> For example, if I want CONFIG_MTD_CMDLINE_PARTS=y, the system may be
>> smart enough to notice and automatically enable CONFIG_MTD and
>> CONFIG_MTD_PARTITIONS without having to carry those in the defconfig.
>
> How do you sort out something like this:
>
> config FOO
>        bool "Foo"
>        depends on (A && B) || C
>
> Do you enable A and B, A, B and C or just C?
>
> Bear in mind that A could be 'X86', 'M68K' or any other arch specific
> symbol.
>
> I prefer the warning method because it prompts you to investigate what's
> changed and sort out the problem by ensuring that the appropriate symbols
> are also selected.  The automatic selection of dependencies method carries
> the risk that it'll do the wrong thing with the above scenario.

Good point.

g.
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