Re: [GIT PULL] two more s390 bug fixes for 4.17

[Christoph Hellwig]

> -	req->completion_data = cqr;
> +	*((struct dasd_ccw_req **) blk_mq_rq_to_pdu(req)) = cqr;
> +

Please don't play such tricks.  In general your driver structure
should have struct request embedded.  If for some reason
struct dasd_ccw_req has a different life time please create a new
structure instead of these hacks.

In either way this really doesn't look like a post-rc7 change.