simplify queue allocation

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: simplify queue allocation
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 27 Mar 2020 09:30:07 +0100
Cc: linux-bcache@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx

Hi Jens,

this series ensures all allocated queues have a valid ->make_request_fn
and also nicely consolidates the code for allocating queues.

Follow-Ups:
- Re: simplify queue allocation
  - From: Jens Axboe
- [PATCH 5/5] Revert "blkdev: check for valid request queue before issuing flush"
  - From: Christoph Hellwig
- [PATCH 4/5] block: simplify queue allocation
  - From: Christoph Hellwig
- [PATCH 3/5] bcache: pass the make_request methods to blk_queue_make_request
  - From: Christoph Hellwig
- [PATCH 2/5] null_blk: use blk_mq_init_queue_data
  - From: Christoph Hellwig
- [PATCH 1/5] block: add a blk_mq_init_queue_data helper
  - From: Christoph Hellwig

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