Waiman Long 866f587e9c cgroup/cpuset: Avoid unnecessary cpus & mems update in cpuset_hotplug_update_tasks() ... As reported by sashiko [1], cpuset_hotplug_update_tasks() may perform unnecessary task iteration and updating of tasks' CPU and node masks when mems_allowed and/or cpus_allowed are not set in cpuset v2. It is due to the fact that the temporary new_cpus and new_mems masks do not inherit parent's effective_cpus/mems when they are empty which is the expected behavior for cpuset v2 since commit 4ec22e9c5a ("cpuset: Enable cpuset controller in default hierarchy"). Fix that and avoid unnecessary work by enhancing compute_effective_cpumask() to add the empty cpumask check and inheriting the parent's versions if empty when in v2. A new compute_effective_nodemask() helper is also added to perform a similar function for new effective_mems. Add new test_cpuset_prs.sh test cases to confirm that effective_cpus will inherit the parent's version if cpuset.cpus is empty. [1] https://sashiko.dev/#/patchset/20260621032816.1806773-1-longman%40redhat.com Suggested-by: Ridong Chen <ridong.chen@linux.dev> Fixes: 4ec22e9c5a ("cpuset: Enable cpuset controller in default hierarchy") Signed-off-by: Waiman Long <longman@redhat.com> Reviewed-by: Ridong Chen <ridong.chen@linux.dev> Signed-off-by: Tejun Heo <tj@kernel.org>		2026-06-24 09:41:37 -10:00
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crypto/chacha20-s390	crypto: drbg - Fold include/crypto/drbg.h into crypto/drbg.c	2026-05-07 16:09:59 +08:00
cxl	Merge branch 'for-7.2/cxl-type2-attach-region' into cxl-for-next	2026-06-12 13:47:53 -07:00
fault-injection
ktest	ktest: Add logfile to failure directory	2026-04-20 15:23:13 -04:00
kunit	kunit:tool: Don't write to stdout when it should be disabled	2026-06-07 20:10:30 -06:00
memblock	liveupdate: updates for 7.2-rc1	2026-06-21 09:46:14 -07:00
nvdimm
radix-tree	MAINTAINERS: update Liam's email address	2026-04-27 05:54:25 -07:00
rbtree
scatterlist
selftests	cgroup/cpuset: Avoid unnecessary cpus & mems update in cpuset_hotplug_update_tasks()	2026-06-24 09:41:37 -10:00
shared	mm/slab: improve kmem_cache_alloc_bulk	2026-06-03 18:20:43 +02:00
vma	mm/vma: eliminate mmap_action->error_hook, introduce error_override	2026-06-04 14:45:00 -07:00
vsock	vsock/test: add MSG_PEEK after partial recv test	2026-04-16 19:34:22 -07:00