Merge tag 'io_uring-5.9-2020-08-21' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - Make sure the head link cancelation includes async work

 - Get rid of kiocb_wait_page_queue_init(), makes no sense to have it as
   a separate function since you moved it into io_uring itself

 - io_import_iovec cleanups (Pavel, me)

 - Use system_unbound_wq for ring exit work, to avoid spawning tons of
   these if we have tons of rings exiting at the same time

 - Fix req->flags overflow flag manipulation (Pavel)

* tag 'io_uring-5.9-2020-08-21' of git://git.kernel.dk/linux-block:
  io_uring: kill extra iovec=NULL in import_iovec()
  io_uring: comment on kfree(iovec) checks
  io_uring: fix racy req->flags modification
  io_uring: use system_unbound_wq for ring exit work
  io_uring: cleanup io_import_iovec() of pre-mapped request
  io_uring: get rid of kiocb_wait_page_queue_init()
  io_uring: find and cancel head link async work on files exit