[PATCHSET for-next 0/9] Poll improvements

[Jens Axboe <axboe@kernel.dk>]

Hi,

Here's a series that implements:

- Support for multi-shot poll. This allows arming a poll request for a
  given event mask, and then have it trigger multiple times. The default
  behavior for io_uring POLL_ADD has been one-shot, where one SQE issued
  will result in one CQE filled (when the event triggers) and termination
  of the poll request after that. With multi-shot, one POLL_ADD will
  generate a CQE every time the event triggers.

- Support for POLL_ADD updates. This allows updating the event mask (only)
  of an existing poll request, both one-shot and multi-shot.

Outside of that, just a few cleanups, and Pavel's change how overflowed
CQEs are handled.

-- 
Jens Axboe