Merge tag 'cgroup-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup updates from Tejun Heo:

 - A write to cgroup.subtree_control or cgroup.type could hang in D
   state for as long as a task pinning a dying controller took to exit,
   as syzbot reported. The wait is now interruptible.

 - cpuset: the deadline bandwidth check ran on cpusets that weren't
   valid partition roots, failing cpuset writes with -EBUSY while
   deadline tasks existed. The CPU count the fair class takes from
   cpuset assumed a shared hierarchy that cgroup1 may not have.

 - Finding a cgroup's effective controller state no longer walks up the
   hierarchy, for per-I/O users such as nvmet. io.stat reads of cgroups
   without block devices skip the stat flush.

 - cpuset v1-only code moved to the v1 file and the exclusive flag
   dropped from v2, with documentation corrections for partition roots
   and boot-isolated CPUs.

 - Dead cgroups fail writes with -ENODEV consistently, plus small
   cleanups.

 - Selftest fixes, most visibly for tests that skipped on machines with
   many mounts, and a new pids.events notification test.

* tag 'cgroup-for-7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (27 commits)
  selftests/cgroup: test pids.events notification
  selftests: cgroup: make test_memcg_sock check flushed sock stats
  selftests: cgroup: skip test_memcg_sock under cgroup.memory=nosocket
  selftests/cgroup: Free the paths returned by cg_control()
  selftests: memcg: Don't close an uninitialized fd
  cgroup: Track the effective css in each cgroup
  cgroup/cpuset: Move cpuset_update_flag() to cpuset-v1.c
  selftests: cgroup: Preserve command arguments in with_stress.sh
  selftests: cgroup: Enable the cpu controller in test_cpu
  cgroup/cpuset: Use cpuset_v2() in cpuset_num_cpus()
  selftests/cgroup: add settings file with a longer timeout
  cgroup/cpuset: Remove CS_CPU_EXCLUSIVE handling code from v2
  cgroup/cpuset: Run SCHED_DEADLINE shrink test on valid partition root only
  docs: cgroup-v2: Describe effective CPUs of partition roots
  docs: cgroup-v2: Describe boot-isolated CPUs in cpuset.cpus.isolated
  cgroup/cpuset: Remove redundant sched domain rebuild from update_prstate()
  selftests/cgroup: don't crash on a truncated mount entry in cg_find_root()
  selftests/cgroup: read the entire file in read_text()
  blk-cgroup: skip rstat flush for cgroups without blkgs
  cgroup: use assign_bit() where applicable
  ...

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