On Tue, May 15, 2018 at 09:57:44AM -0400, Waiman Long wrote: > > Afaict the whole .owner=NULL thing in release already stops the spinners > > dead, and the above 'fixes' the debug splat. And this avoids exposing > > that horrible interface and keeps the mucking private to > > rwsem/percpu_rwsem. > > Actually setting owner to NULL does not stop spinning. The code just > assume that the lock is going to be freed and spin in the outer loop. We > need some special value to indicate that spinning should be stopped. How > about just exposing a special value for that in linux/rwsem.h? Any > suggestion for a good name?
RWSEM_NO_OWNER
