Pull cgroup updates from Tejun Heo:
- Attach path bug fixes: migrations spanning multiple source or
destination cpusets were mishandled, most visibly leaving thread
affinities stale when the controller is disabled in a threaded
subtree. Configuration writes could also race an in-flight attach and
apply stale state, and the deadline task count could get corrupted by
concurrent updates, skewing SCHED_DEADLINE admission decisions.
- Memory binding bug fixes: which node masks get applied differed
between the binding update paths, and tasks cloned with
CLONE_INTO_CGROUP skipped rebinding entirely. Rebinding also now runs
once per process instead of repeating for every thread sharing the
mm.
- Overhead removals with no behavior change: CPU hotplug iterated tasks
of cpusets that just inherit the parent's effective masks, and the
slab-spreading task flag was still being maintained although the SLAB
allocator that consumed it is long gone.
- Data-race annotations for benign races so that KCSAN reports stay
meaningful, selftest coverage for the fixes above along with
flakiness and portability fixes, and documentation corrections.
* tag 'cgroup-for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: (34 commits)
selftests/cgroup: Remove redundant chown in test_cgcore_lesser_ns_open
selftests/cgroup: Preserve CPU hotplug write errors
cgroup/cpuset: Add test for partition root invalidation returning wrong CPUs
cgroup/cpuset: Remove obsolete PFA_SPREAD_SLAB task flag
docs: cgroup-v2: fix stale "io" controller introduction
selftests/cgroup: Avoid awk -e in cpuset tests
cgroup/cpuset: Use WRITE_ONCE() for shared prs_err updates
selftests/cgroup: add user_usec sanity check in test_cpucg_nice
cgroup: drop unneeded semicolon
docs: cgroup-v2: mark memory.pressure and io.pressure as read-write
selftests/cgroup: Fix minor defects in test_cpuset
Docs/admin-guide/cgroup-v2: fix delay_nsec unit in io.latency doc
selftests/cgroup: Remove redundant cg_enter_current() call in test_core
selftests/cgroup: Add test for cpuset affinity on controller disable
cgroup/cpuset: Handle the special case of non-moving tasks in cpuset_can_attach()
cgroup/cpuset: Support multiple destination cpusets for cpuset_*attach()
selftests/cgroup: fix missing TAP output in test_hugetlb_memcg
cgroup/cpuset: Support multiple source cpusets for cpuset_*attach()
cgroup/cpuset: Move mpol_rebind_mm/cpuset_migrate_mm() calls inside cpuset_attach_task()
cgroup/cpuset: Make attach_ctx.old_cs track task group leader
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