linux-kernel - Re: RFC: kconfig select warnings bogus?

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Date:	Sun, 20 May 2007 17:08:52 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Stefan Richter" <stefanr@...6.in-berlin.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Sam Ravnborg" <sam@...nborg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Roman Zippel" <zippel@...ux-m68k.org>,
	"Kumar Gala" <galak@...nel.crashing.org>,
	"Simon Horman" <horms@...ge.net.au>, "Adrian Bunk" <bunk@...sta.de>
Subject: Re: RFC: kconfig select warnings bogus?

On 5/20/07, Stefan Richter <stefanr@...6.in-berlin.de> wrote:
> Satyam Sharma wrote:
> > You'll learn about the "default .. if .." Kconfig idiom after you try
> > this,
>
> I have seen these in the rest of the patch which I didn't quote.
>
> However you fix it --- don't remove "depends on" or "select".  You can
> interchange them, but not remove them, unless there wasn't a dependency
> to begin with.

They _can_ be removed, with absolutely no build failures at all, because
of the "default y if ..." on the dependency that is defined in some
arch/.../Kconfig.

In fact the whole _idea_ is to remove any mention of the arch-specific
dependency from arch-agnostic stuff in drivers/.../Kconfig's (be it
"depends" or "select") so as not to generate those "unknown symbols"
warnings that would come on other archs. Hence, the normal practice to
use the "default y if ..." idiom (for "bool" helper code like the original
examples on this thread) in arch/.../Kconfig files.
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