[GIT PULL] cgroup: Fixes for v7.4-rc2

[Tejun Heo <tj@kernel.org>]

Hello,

The following changes since commit 518cec2def9992192291f5028edc077fb2e475e9:

  cgroup/cpuset: Integrate compute_partition_effective_cpumask() into compute_effective_cpumask() (2026-10-26 07:44:43 -1000)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git tags/cgroup-for-7.4-rc2-fixes

for you to fetch changes up to acec9637e03ca54bd3c3a0c1a6ad5c6dfa07c0df:

  cgroup/cpuset: Don't revive invalid partition without active CPU on hotplug (2026-11-15 10:15:12 -1000)

----------------------------------------------------------------
cgroup: Fixes for v7.4-rc2

- A file notification racing the file's removal could re-arm the
  notification timer after it was shut down, corrupting the timer wheel or
  firing on freed memory.

- The v1 freezer could leave an exiting task frozen forever after its cgroup
  was thawed or removed.

- With memcg built without the block cgroup controller, memcg reclaim waited
  on writeback and could deadlock against a filesystem freeze. memcg now
  selects the controller.

- cpuset partition state could go wrong when CPUs move between nested
  partitions or go offline: isolated CPUs leaked or went missing, invalid
  partitions kept exclusive CPUs or came back with no usable CPU, and
  expanding a remote partition could fail. Separately, a forked child could
  inherit a corrupted memory node mask.

----------------------------------------------------------------
Chen Ridong (1):
      cpuset: add early empty cpumask check in partition_xcpus_add/del

Christian Brauner (1):
      memcg: make MEMCG select BLK_CGROUP

Mani Tofigh (2):
      cgroup: arm the notify timer only while the file exists
      cgroup/freezer: walk exiting tasks in the v1 freezer

Ridong Chen (5):
      cgroup/cpuset: Reset partition data when an invalid partition stays invalid
      cpuset: settle isolation state when CPUs are given back to parent
      cpuset: generalize the validate_partition() interface
      cgroup/cpuset: Remove redundant WARN_ON_ONCE() in remote_cpus_update()
      cgroup/cpuset: Don't revive invalid partition without active CPU on hotplug

Tejun Heo (1):
      cgroup/freezer: Fix exiting tasks left frozen forever after rmdir

Waiman Long (6):
      cgroup/cpuset: Fix incorrect CPU accounting with parent's effective_xcpus expansion
      cgroup/cpuset: Recompute effective cpumask in update_cpumasks_hier() after calling update_parent_effective_cpumask()
      cgroup/cpuset: Do housekeeping check when isolated child with root parent may get more xcpus
      selftests/cgroup: Fix "test_cpuset_prs.sh -v" failures
      cgroup/cpuset: Protect current->mems_allowed read in cpuset_fork()
      cgroup/cpuset: Correctly set isolated_cpus when switching partition state

 init/Kconfig                                      |   1 +
 kernel/cgroup/cgroup.c                            |  22 +-
 kernel/cgroup/cpuset.c                            | 316 +++++++++++-----------
 kernel/cgroup/legacy_freezer.c                    |  40 ++-
 tools/testing/selftests/cgroup/test_cpuset_prs.sh |  46 +++-
 5 files changed, 251 insertions(+), 174 deletions(-)

-- 
tejun