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cgroup: A fix for v6.15-rc6 

One low-risk patch to fix a cpuset bug where it over-eagerly tries to modify
 CPU affinity of kernel threads.
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Merge tag 'cgroup-for-6.15-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

Pull cgroup fix from Tejun Heo:
 "One low-risk patch to fix a cpuset bug where it over-eagerly tries to
  modify CPU affinity of kernel threads"

* tag 'cgroup-for-6.15-rc6-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup/cpuset: Extend kthread_is_per_cpu() check to all PF_NO_SETAFFINITY tasks
This commit is contained in:
Linus Torvalds 2025-05-12 17:58:57 -07:00
parent 7a8bdc7fe0 39b5ef791d
commit d471045e75
1 changed files with 4 additions and 2 deletions
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6
kernel/cgroup/cpuset.c
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@ -1116,9 +1116,11 @@ void cpuset_update_tasks_cpumask(struct cpuset *cs, struct cpumask *new_cpus)
if (top_cs) {
/*
* Percpu kthreads in top_cpuset are ignored
* PF_NO_SETAFFINITY tasks are ignored.
* All per cpu kthreads should have PF_NO_SETAFFINITY
* flag set, see kthread_set_per_cpu().
*/
if (kthread_is_per_cpu(task))
if (task->flags & PF_NO_SETAFFINITY)
continue;
cpumask_andnot(new_cpus, possible_mask, subpartitions_cpus);
} else {