Re: [PATCH] fix-flush_workqueue-vs-cpu_dead-race-update

[Oleg Nesterov <oleg@tv-sign.ru>]

On 01/07, Oleg Nesterov wrote:
>
> Thoughts?

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.

	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()

Oleg.

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