avoid the ->make_request_fn indirect for blk-mq drivers

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To: Jens Axboe <axboe@xxxxxxxxx>
Subject: avoid the ->make_request_fn indirect for blk-mq drivers
From: Christoph Hellwig <hch@xxxxxx>
Date: Sat, 25 Apr 2020 09:53:33 +0200
Cc: dm-devel@xxxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx

Hi Jens,

this small series avoids an indirect call for every submitted bio that
eventually ends up being handled by blk-mq drivers.  Let me know what
you think.

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Follow-Ups:
- Re: avoid the ->make_request_fn indirect for blk-mq drivers
  - From: Jens Axboe
- [PATCH 3/3] block: bypass ->make_request_fn for blk-mq drivers
  - From: Christoph Hellwig
- [PATCH 2/3] dm: remove the make_request_fn check in device_area_is_invalid
  - From: Christoph Hellwig
- [PATCH 1/3] bcache: remove a duplicate ->make_request_fn assignment
  - From: Christoph Hellwig

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