Merge tag 'cgroup-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroupHEADtorvalds/mastertorvalds/HEADmaster

Pull cgroup updates from Tejun Heo:

 - Extensive cpuset code cleanup and refactoring work with no functional
   changes: CPU mask computation logic refactoring, introducing new
   helpers, removing redundant code paths, and improving error handling
   for better maintainability.

 - A few bug fixes to cpuset including fixes for partition creation
   failures when isolcpus is in use, missing error returns, and null
   pointer access prevention in free_tmpmasks().

 - Core cgroup changes include replacing the global percpu_rwsem with
   per-threadgroup rwsem when writing to cgroup.procs for better
   scalability, workqueue conversions to use WQ_PERCPU and
   system_percpu_wq to prepare for workqueue default switching from
   percpu to unbound, and removal of unused code including the
   post_attach callback.

 - New cgroup.stat.local time accounting feature that tracks frozen time
   duration.

 - Misc changes including selftests updates (new freezer time tests and
   backward compatibility fixes), documentation sync, string function
   safety improvements, and 64-bit division fixes.

* tag 'cgroup-for-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (39 commits)
  cpuset: remove is_prs_invalid helper
  cpuset: remove impossible warning in update_parent_effective_cpumask
  cpuset: remove redundant special case for null input in node mask update
  cpuset: fix missing error return in update_cpumask
  cpuset: Use new excpus for nocpu error check when enabling root partition
  cpuset: fix failure to enable isolated partition when containing isolcpus
  Documentation: cgroup-v2: Sync manual toctree
  cpuset: use partition_cpus_change for setting exclusive cpus
  cpuset: use parse_cpulist for setting cpus.exclusive
  cpuset: introduce partition_cpus_change
  cpuset: refactor cpus_allowed_validate_change
  cpuset: refactor out validate_partition
  cpuset: introduce cpus_excl_conflict and mems_excl_conflict helpers
  cpuset: refactor CPU mask buffer parsing logic
  cpuset: Refactor exclusive CPU mask computation logic
  cpuset: change return type of is_partition_[in]valid to bool
  cpuset: remove unused assignment to trialcs->partition_root_state
  cpuset: move the root cpuset write check earlier
  cgroup/cpuset: Remove redundant rcu_read_lock/unlock() in spin_lock
  cgroup: Remove redundant rcu_read_lock/unlock() in spin_lock
  ...

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