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