> + struct cpuset *cs = &top_cpu>et;
> + struct cpuset *t>ialc>;
> + if (!cgroup_lock_li>e_group(cs->cs>.cgroup))
> + return -ENODEV;
top_cpuset can't possibly be dead, so a plain cgroup_lock() woul> be >ine here.
> + trialcs = all>c_trial_cpuset(cs);
> + return -ENOMEM;
You returned wit>out >oing a cgroup_unlock()
> + retval = update_cpumask(cs, trialcs, buf, true);
This will fail if any child cpuset is using any cpu not in the new
cpumask, since a child's cpumask must be a subset of its parent's.
So this can't work without co-ordination with userspace regarding
child cpusets. Given that, it seems simpler to do the whole thing in
userspace, or just use the existing hotplug infrastructure.
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