linux-kernel - Re: [PATCH v2] [media] v4l: omap4iss: Add DEBUG compiler flag

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Message-ID: <3032500.9J1uSX3lel@avalon>
Date:	Thu, 06 Mar 2014 02:27:46 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Paul Bolle <pebolle@...cali.nl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] [media] v4l: omap4iss: Add DEBUG compiler flag

Hi Joe,

On Wednesday 05 March 2014 17:00:37 Joe Perches wrote:
> On Thu, 2014-03-06 at 01:48 +0100, Laurent Pinchart wrote:
> > Would you recommend to drop driver-specific Kconfig options related to
> > debugging and use CONFIG_DYNAMIC_DEBUG instead ?
> 
> For development, sure, if there's sufficient memory.
> 
> For embedded systems with limited memory, using dynamic_debug isn't always
> possible or effective.
> 
> Also, there are sometimes reasons to have debugging messages always enabled
> or emitted.
> 
> For those cases, either adding #define DEBUG or using printk(KERN_DEBUG
> would be fine.

My goal here is to offer an easy way for users to enable debugging without 
requiring changes to the source code. The driver includes various dev_dbg() 
messages, I don't want to ask people reporting problems to turn them into 
printk() calls :-) Even adding #define DEBUG at the beginning of the source 
files is likely too error prone for users without much programming experience.

-- 
Regards,

Laurent Pinchart

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