linux-kernel - Re: [PATCH 0/5] RFC: strip 15,000 lines from a typical autoconf.h

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Date:	Thu, 12 Apr 2012 13:10:37 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, tony@...eyournoodle.com, mmarek@...e.cz,
	lacombar@...il.com
Subject: Re: [PATCH 0/5] RFC: strip 15,000 lines from a typical autoconf.h

Hi Linus,

On Wed, 11 Apr 2012 18:55:10 -0700 Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
> On Wed, Apr 11, 2012 at 6:45 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> >
> > So we shouldn't call it IS_DEFINED() - that would cause confusion with
> > the old version.
> 
> Yeah. Maybe we should call it "config_enabled()" - the lower-case
> hopefully makes it clear that it acts as a C function, not a
> preprocessor one.
> 
> Code like "if (config_enabled(IPV6))" looks reasonably readable to me.
> 
> I asked G+ if they can come up with a better trick. They did well on
> the whole bitmask calculations, maybe somebody can figure out how to
> make the same macro work for both preprocessor and C code...

Can we leave the CONFIG_ part in the caller, so they are still grepable, please?

So:

	#define	config_enabled(x)	(__stringify(x)[0] == '1')

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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