linux-kernel - Re: [patch] video: build fix for drivers/media/video/mt9v022.c

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Date:	Sat, 3 May 2008 19:58:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [patch] video: build fix for drivers/media/video/mt9v022.c


* Guennadi Liakhovetski <g.liakhovetski@....de> wrote:

> > with this config:
> > 
> >    http://redhat.com/~mingo/misc/config-Sat_May__3_16_08_39_CEST_2008.bad
> > 
> > the bug was that the driver uses GPIO functionality but only 
> > includes the GPIO interface definitions for the 
> > CONFIG_MT9M001_PCA9536_SWITCH case, which was not set in this 
> > config.
> 
> Ok, once again a good catch and a wrong fix, sorry :-) The bug is that 
> not CONFIG_MT9M001_PCA9536_SWITCH but CONFIG_MT9V022_PCA9536_SWITCH 
> shall be checked for, of course. Copy-paste:-( I'll prepare a correct 
> patch and submit it. As for the "cleanup" side - don't know. Would it 
> be better to unconditionally include it? It won't hurt of course, 
> looks better, but is unneeded when the GPIO is not used. And, although 
> grep reports most drivers including asm/gpio.h, including linux/gpio.h 
> seems indeed better.

No. If you look at the core kernel you wont see it sprinkled with things 
like:

 #ifdef CONFIG_LOCKDEP
 #include <linux/lockdep.h>
 #endif

why? Because we have put all such things into the include file 
themselves and do not want to sprinkle .c files with ugly #ifdefs. This 
is a basic cleanliness issue.

Furthermore, if anyone _else_ copy & pastes your driver, this bug wont 
hit him anymore.

so please keep that #include <linux/gpio.h>.

	Ingo
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