Quoting Oren Laadan (orenl-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org):

From: Sukadev Bhattiprolu <redacted>

This parameter is currently NULL, but will be used in a follow-on patch.

Note that patches 1-4 of the clone_with_pid() patchset should
also be useful if we decide to re-create process trees in-kernel
and not export clone_with_pid().  (Though maybe not immediately
applicable to Alexey's current kthread_run()-based approach).

-serge
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