blk-cgroup cleanups

To: Jens Axboe <axboe@xxxxxxxxx>
Subject: blk-cgroup cleanups
From: Christoph Hellwig <hch@xxxxxx>
Date: Thu, 6 Jun 2019 12:26:18 +0200
Cc: Paolo Valente <paolo.valente@xxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

below are a couple of cleanups I came up with when trying to understand
the blk-cgroup code.

Follow-Ups:
- Re: blk-cgroup cleanups
  - From: Jens Axboe
- Re: blk-cgroup cleanups
  - From: Christoph Hellwig
- Re: blk-cgroup cleanups
  - From: Tejun Heo
- [PATCH 2/6] blk-cgroup: pass blkg_rwstat structures by reference
  - From: Christoph Hellwig
- [PATCH 6/6] block: rename CONFIG_DEBUG_BLK_CGROUP to CONFIG_BFQ_CGROUP_DEBUG
  - From: Christoph Hellwig
- [PATCH 5/6] bfq-iosched: move bfq_stat_recursive_sum into the only caller
  - From: Christoph Hellwig
- [PATCH 4/6] blk-cgroup: move struct blkg_stat to bfq
  - From: Christoph Hellwig
- [PATCH 3/6] blk-cgroup: introduce a new struct blkg_rwstat_sample
  - From: Christoph Hellwig
- [PATCH 1/6] blk-cgroup: factor out a helper to read rwstat counter
  - From: Christoph Hellwig