[PATCH 0/4] sqpoll fixes

[Pavel Begunkov <asml.silence@gmail.com>]

1-3 are relatively easy. 2/3 is rather a cleanup, but it's better to
throw it out of the equation, makes life easier.

4/4 removes the park/unpark dance for cancellations, and fixes a couple
of issues (will send one test later).
Signals in io_sq_thread() add troubles adding more cases to think about
and care about races b/w dying SQPOLL task, dying ctxs and going away
userspace tasks.

Pavel Begunkov (4):
  io_uring: cancel deferred requests in try_cancel
  io_uring: remove useless ->startup completion
  io_uring: prevent racy sqd->thread checks
  io_uring: cancel sqpoll via task_work

 fs/io_uring.c | 195 +++++++++++++++++++++++++-------------------------
 1 file changed, 99 insertions(+), 96 deletions(-)

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2.24.0