Hi Roberto,
Those were added in 040a0a371005 ("mutex: Add support for wound/wait
style locks"). 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
