Merge tag 'cgroup-for-7.2-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fixes from Tejun Heo:

 - A pressure trigger's poll timer could be re-armed while the last
   trigger was being torn down and then fire after the cgroup was freed.

   Tie the timer to the cgroup's lifetime and shut it down when the
   cgroup is freed.

 - Writing to a pressure file forked a worker kthread while holding the
   cgroup mutex, creating lock dependencies from the mutex to the whole
   fork path. A pressure write racing a sched_ext scheduler enable,
   which blocks forks before grabbing the mutex, deadlocked.

   Fork the worker with the mutex dropped.

 - Documentation fix for io.latency behavior on non-rotational devices.

* tag 'cgroup-for-7.2-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  Docs/admin-guide/cgroup-v2: document io.latency rotational vs non-rotational behavior
  sched/psi: Shut down rtpoll_timer in psi_cgroup_free()
  sched/psi: Create the psimon kthread outside of cgroup_mutex

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