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Returning buffers via a ring is performant and convenient, but it becomes a problem when/if the user misconfigured the ring size and it becomes full. Add a synchronous way to return buffers back to the page pool via a new register opcode. It's supposed to be a reliable slow path for refilling. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>