linux-kernel - Re: [v4l-dvb-maintainer] 2.6.25 regression: VIDEO

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Date:	Mon, 28 Jan 2008 14:12:45 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Trent Piepho <xyzzy@...akeasy.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	v4l-dvb-maintainer@...uxtv.org,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [v4l-dvb-maintainer] 2.6.25 regression: VIDEO_DEV=y/m, I2C=n
	compile error

On Mon, Jan 28, 2008 at 09:49:12AM -0200, Mauro Carvalho Chehab wrote:
> > Maybe the kernel headers should provide a couple macros for testing
> > configs, since people get it wrong over and over again?
> > 
> > #define CONFIG_ON(x) (defined(CONFIG_##x) || defined(CONFIG_##x##_MODULE))
> > #define CONFIG_AVAIABLE(x) (defined(CONFIG_##x) || (defined(MODULE) && defined(CONFIG_##x##_MODULE)))
> 
> Seems a good idea to me.
> > 
> > Not sure what to do about VIDEO_DEV=y, I2C=m.  It should be possible except
> > for this function.
> 
> I don't see much sense on allowing v4l2-common being in-kernel, while having
> I2C as module. Also, creating a separate module for just a single function
> seems to be overkill.
> 
> IMO, in this specific case, v4l2-common should also be a module. Not sure,
> however,the better syntax on Kconfig. Once, someone suggested a very weird
> syntax, like:
> 
> 	depends on I2C if I2C

Why does anyone want to introduce such a weird syntax for something 
that already works with the simple

	depends on I2C || I2C=n

?

> Cheers,
> Mauro

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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