linux-kernel - cleanup ubd gendisk registration

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Date:   Mon, 14 Jun 2021 08:07:57 +0200
From:   Christoph Hellwig <hch@....de>
To:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: cleanup ubd gendisk registration

Hi all,

this series sits on top of Jens' for-5.14/block branch and tries to
convert ubd to the new gendisk and request_queue registration helpers.
As part of that I found that the ide emulation code currently registers
two gendisk for a request_queue which leads to a bunch of problems we've
avoided in other drivers (only the mmc subsystem has a similar issue).
Given that the legacy IDE driver isn't practically used any more and
modern userspace doesn't hard code specific block drivers, so I think
we can just drop it.  Let me know if this is ok.