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There is no documentation, but it's possible it was done deliberately because when you have debugging enabled that's linux specific hence the GPL? I wouldn't encourage you to send this as a first patch... 1) Patches need to be inline (not as attachment) 2) Need a subsystem prefix in the subject. 3) The Rationale needs to be in the commit message. 4) Send the patch to the people from ./scripts/get_maintainer.pl regards, dan carpenter