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

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Date:	Thu, 06 Mar 2014 01:48:29 +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 16:28:03 Joe Perches wrote:
> On Thu, 2014-03-06 at 00:50 +0100, Laurent Pinchart wrote:
> > Please note that -DDEBUG is equivalent to '#define DEBUG', not to '#define
> > CONFIG_DEBUG'. 'DEBUG' needs to be defined for dev_dbg() to have any
> > effect.
>
> Not quite.  If CONFIG_DYNAMIC_DEBUG is set, these
> dev_dbg statements are compiled in but not by default
> set to emit output.  Output can be enabled by using
> dynamic_debug controls like:
> 
> # echo -n 'file omap4iss/* +p' > <debugfs>/dynamic_debug/control
> 
> See Documentation/dynamic-debug-howto.txt for more details.

Thank you for the additional information.

Would you recommend to drop driver-specific Kconfig options related to 
debugging and use CONFIG_DYNAMIC_DEBUG instead ?

-- 
Regards,

Laurent Pinchart

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