io_uring: don't cache number of dropped SQEs
Kill ->cached_sq_dropped and wire DRAIN sequence number correction via ->cq_extra, which is there exactly for that purpose. User visible dropped counter will be populated by incrementing it instead of keeping a copy, similarly as it was done not so long ago with cq_overflow. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/088aceb2707a534d531e2770267c4498e0507cc1.1623709150.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>
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