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cpuset: initialize effective masks when clone_children is enabled
If clone_children is enabled, effective masks won't be initialized due to the bug: # mount -t cgroup -o cpuset xxx /mnt # echo 1 > cgroup.clone_children # mkdir /mnt/tmp # cat /mnt/tmp/ # cat cpuset.effective_cpus # cat cpuset.cpus 0-15 And then this cpuset won't constrain the tasks in it. Either the bug or the fix has no effect on unified hierarchy, as there's no clone_chidren flag there any more. Reported-by: Christian Brauner <christianvanbrauner@gmail.com> Reported-by: Serge Hallyn <serge.hallyn@ubuntu.com> Cc: <stable@vger.kernel.org> # 3.17+ Signed-off-by: Zefan Li <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org> Tested-by: Serge Hallyn <serge.hallyn@canonical.com>
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@ -1979,7 +1979,9 @@ static int cpuset_css_online(struct cgroup_subsys_state *css)
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spin_lock_irq(&callback_lock);
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cs->mems_allowed = parent->mems_allowed;
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cs->effective_mems = parent->mems_allowed;
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cpumask_copy(cs->cpus_allowed, parent->cpus_allowed);
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cpumask_copy(cs->effective_cpus, parent->cpus_allowed);
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spin_unlock_irq(&callback_lock);
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out_unlock:
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mutex_unlock(&cpuset_mutex);
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