linux-kernel - Re: [origin tree build failure] [PATCH] media: video: Fix build in saa7164

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Date:	Mon, 21 Sep 2009 20:57:54 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [origin tree build failure] [PATCH] media: video: Fix build in
 saa7164

Em Mon, 21 Sep 2009 20:23:45 +0200
Ingo Molnar <mingo@...e.hu> escreveu:

> 
> * Mauro Carvalho Chehab <mchehab@...hat.com> wrote:
> 
> > This series also contains several new drivers:
> > 
> >    - new driver for NXP saa7164;
> 
> -tip testing found that an allyesconfig build buglet found its way into 
> this driver - find the fix below.
> 

> diff --git a/drivers/media/video/saa7164/saa7164-core.c b/drivers/media/video/saa7164/saa7164-core.c
> index f0dbead..60f3214 100644
> --- a/drivers/media/video/saa7164/saa7164-core.c
> +++ b/drivers/media/video/saa7164/saa7164-core.c
> @@ -45,8 +45,8 @@ MODULE_LICENSE("GPL");
>   32 bus
>   */
>  
> -unsigned int debug;
> -module_param(debug, int, 0644);
> +unsigned int saa_debug;
> +module_param(saa_debug, int, 0644);

Hmm... it is better to use module_param_named(debug, saa_debug, int, 0644), to
keep presenting the parameter as just "debug" to userspace.

> This is because recent saa7164 changes introduced a global symbol
> named 'debug'. The x86 platform code already defines a 'debug'
> symbol. (which is named in a too generic way as well - but it
> can be used nicely to weed out too generic symbols in drivers ;-

Agreed.

Btw, I suggest to do a similar patch also for x86, to avoid such future conflicts.

-- 

Cheers,
Mauro
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