On 01/07, Oleg Nesterov wrote:
> 
> How about:
> 
>       CPU_DEAD does nothing. After __cpu_disable() cwq->thread runs on
>       all CPUs and becomes idle when it flushes cwq->worklist: nobody
>       will add work_struct on that list.

Also, we can add cpu_workqueue_struct->should_exit_after_flush flag, but
we have to be careful to serialize with destroy_workqueue/CPU_UP.

>       CPU_UP:
>               if (!cwq->thread)
>                       create_workqueue_thread();
>               else
>                       set_cpus_allowed(newcpu);
> 
>       flush_workqueue:
>               for_each_possible_cpu()         // NOT online!
>                       if (cwq->thread)
>                               flush_cpu_workqueue()

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