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

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Message-Id: <201007162211.31973.arnd@arndb.de>
Date:	Fri, 16 Jul 2010 22:11:31 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nicolas Pitre <nico@...xnic.net>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...retlab.ca>,
	Catalin Marinas <catalin.marinas@....com>,
	linuxppc-dev@...ts.ozlabs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kbuild@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.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 Friday 16 July 2010 20:46:17 Linus Torvalds wrote:
> Maybe a full "solver" is unnecessary, for example, but just a simple
> "automatically enable the direct dependencies and scream when it's not
> simple any more" would take care of 99% of the common cases, and then
> warn when it needs some manual help.

I think the recursion should also be limited to cases where the
dependency is a valid selectable option, i.e. not for

# this architecture does not support MMIO
config HAS_IOMEM 
	def_bool 'n'

config PCI
	bool "PCI Device drivers"
	depends on HAS_IOMEM

config FOO
	tristate "Some device driver"
	depends on PCI

In this case, it would be straightforward for the solver to enable PCI
for when something selects CONFIG_FOO, but it should print a warning
if this is attempted while HAS_IOMEM is unconditionally disabled,
since that puts it into the "not simple" category.

	Arnd
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