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

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Message-ID: <1394069742.12070.39.camel@joe-AO722>
Date:	Wed, 05 Mar 2014 17:35:42 -0800
From:	Joe Perches <joe@...ches.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.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

On Thu, 2014-03-06 at 02:27 +0100, Laurent Pinchart wrote:
> 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.

Dynamic debugging works, but various distributions don't
have it enabled.

> 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.

I think your best bet is to add #define DEBUG to a common
header file like iss.h or omap4iss.h




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