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

[Joe Perches]

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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