[PATCHSET v2 block/for-4.3] blkcg: blkcg_policy methods cleanup

[Tejun Heo]

This is v2 of blkcg_policy methods cleanup patchset.  Changes from the
last take [L] are

* Rebased on top of v4.2-rc1 and other pending patches.  v4.2-rc1
  added a patch to add per-blkcg policy data which is allocated by
  blkcg core as per-blkcg_gq policy data was before this patchset
  making the two inconsistent.  I'll follow up with per-blkcg policy
  data update.

This patchset contains assorted cleanups for blkcg_policy methods.

* alloc/free are added.  exit is dropped.

* blk-throttle's async percpu allocation is replaced with direct
  allocation.

* all methods now take blkcg_policy_data instead of blkcg_gq.

Nothing too controversial.

Jens, as we're at the beginning of the 4.2 merge window, I'll ping /
repost this patchset along with other pending patchsets once -rc1
drops.

This patchset contains the following seven patches.

 0001-blkcg-remove-unnecessary-request_list-blkg-NULL-test.patch
 0002-blkcg-use-blkg_free-in-blkcg_init_queue-failure-path.patch
 0003-blkcg-make-blkcg_activate_policy-allow-NULL-pd_init_.patch
 0004-blkcg-replace-blkcg_policy-pd_size-with-pd_alloc-fre.patch
 0005-blk-throttle-remove-asynchrnous-percpu-stats-allocat.patch
 0006-blk-throttle-clean-up-blkg_policy_data-alloc-init-ex.patch
 0007-blkcg-make-blkcg_policy-methods-take-a-pointer-to-bl.patch

0001-0003 are misc cleanups.  0004-0006 add alloc/free methods and
remove blk-throttle's async percpu allocation mechanism.  0007 makes
all methods take blkcg_policy_data.

This patchset is also available in the following git branch.

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-blkcg-methods-cleanup

and is on top of

  d770e558e219 ("Linux 4.2-rc1")
+ [1] [PATCHSET block/for-4.3] writeback: cgroup writeback updates
+ [2] [PATCHSET v2 block/for-4.3] block, cgroup: make cfq charge async IOs to the appropriate blkcgs

diffstat follows, thanks.

 block/blk-cgroup.c         |   52 +++++--------
 block/blk-throttle.c       |  173 +++++++++++++--------------------------------
 block/cfq-iosched.c        |   38 +++++++--
 include/linux/blk-cgroup.h |   31 +++-----
 4 files changed, 116 insertions(+), 178 deletions(-)

--
tejun

[L] http://lkml.kernel.org/g/1435113853-12053-1-git-send-email-tj@xxxxxxxxxx
[1] http://lkml.kernel.org/g/1436281823-1947-1-git-send-email-tj@xxxxxxxxxx
[2] http://lkml.kernel.org/g/1436283361-3889-1-git-send-email-tj@xxxxxxxxxx
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