linux-kernel - Re: [RFC PATCH] kconfig: introduce KCONFIG

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Message-Id: <20080524134815.116feb9d.akpm@linux-foundation.org>
Date:	Sat, 24 May 2008 13:48:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kbuild <linux-kbuild@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [RFC PATCH] kconfig: introduce KCONFIG_* symbols for .c files

On Sat, 24 May 2008 22:24:27 +0200 Sam Ravnborg <sam@...nborg.org> wrote:

> > It could help to get us out of the occasional sticky situation, but it
> > does seem a bit risky.  What happens with Kconfig variables which are
> > just not known about at all with some .configs?
> > 
> > Silly example, one could add
> > 
> > 	if (KCONFIG_DVB_VES1820)
> > 
> > to kernel/sched.c and that would work happily until someone sets DVB=n,
> > in which case I assume KCONFIG_DVB_VES1820 doesn't get defined
> > anywhere?
> It would have helped if I had applied the correct patch...
> All boolean and tristate symbols in the konfiguration have
> their symbols defined as KCONFIG_* no matter their values.
> So KCONFIG_DVB_VES1820 would get defined.

But there are still holes - KCONFIG_ARCH_FOOTBRIDGE wouldn't be defined
on x86, for example.  Anything which is inside an `if' or inside an
if/source/endif will not be known about?  I assume?

It's all probably not a big problem in practice - we'd need to be
more-than-usually-silly to trip over things like this.

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