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

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Date:	Mon, 28 Jan 2008 14:25:23 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Trent Piepho <xyzzy@...akeasy.org>,
	Mauro Carvalho Chehab <mchehab@...radead.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 01:17:10PM +0100, Jan Engelhardt wrote:
> 
> On Jan 28 2008 01:05, Trent Piepho 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)))
>                ^AVAILABLE(x)
> 
> What's the difference between these two?
> 
> CONFIG_x_MODULE will never be defined if MODULE is not, so defined(MODULE)
> seems redundant.
>...

It's not redundant - x is the module you want to use something from, and 
MODULE is defined when the code you are working on gets compiled as a 
module.

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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