Polling on an io_uring file descriptor

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Subject: Polling on an io_uring file descriptor
From: "Drew DeVault" <sir@xxxxxxxxx>
Date: Wed, 20 Oct 2021 11:21:43 +0200

I would like to poll on an io_uring file descriptor to be notified when
CQE's are available, either via poll(2) or IORING_OP_POLL_ADD. This
doesn't seem to work on 5.10. Is this feasible to add support for?

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