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Waiman Long 6e4f700343 cgroup/cpuset: Fix incorrect use of cpuset_update_tasks_cpumask() in update_cpumasks_hier()

[ Upstream commit 68230aac8b ]

Commit e2ffe502ba ("cgroup/cpuset: Add cpuset.cpus.exclusive for v2")
incorrectly changed the 2nd parameter of cpuset_update_tasks_cpumask()
from tmp->new_cpus to cp->effective_cpus. This second parameter is just
a temporary cpumask for internal use. The cpuset_update_tasks_cpumask()
function was originally called update_tasks_cpumask() before commit
381b53c3b5 ("cgroup/cpuset: rename functions shared between v1
and v2").

This mistake can incorrectly change the effective_cpus of the
cpuset when it is the top_cpuset or in arm64 architecture where
task_cpu_possible_mask() may differ from cpu_possible_mask.  So far
top_cpuset hasn't been passed to update_cpumasks_hier() yet, but arm64
arch can still be impacted. Fix it by reverting the incorrect change.

Fixes: e2ffe502ba ("cgroup/cpuset: Add cpuset.cpus.exclusive for v2")
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-03-13 17:20:17 +01:00

cgroup-internal.h

mm, memcg: cg2 memory{.swap,}.peak write handlers

2024-09-01 20:25:53 -07:00

cgroup-v1.c

cgroup: Do not report unavailable v1 controllers in /proc/cgroups

2024-09-10 10:04:28 -10:00

cgroup.c

cgroup: Fix kernfs_node UAF in css_free_rwork_fn

2026-02-06 16:55:49 +01:00

cpuset-internal.h

cgroup/cpuset: Don't allow creation of local partition over a remote one