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

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Date:	Wed, 05 Mar 2014 16:28:03 -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 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.


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