io_uring: clean R_DISABLED startup mess
There are enough of problems with IORING_SETUP_R_DISABLED, including the burden of checking and kicking off the SQO task all over the codebase -- for exit/cancel/etc. Rework it, always start the thread but don't do submit unless the flag is gone, that's much easier. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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