On Mon, Sep 23, 2019 at 09:27:42PM +0200, Peter Zijlstra wrote: > Also, is anything actually using wait_queue_entry::private ? I'm > not finding any in a hurry. That is; outside of default_wake_function(). I don't see a sensible reason for that field to be 'void *' nor for the name 'private'. But _that_ is something we can fix later.