workqueue usage in vmpressure

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Hello, guys.

While auditing cgroup_subsys_state() usages, I noticed something weird
in vmpressure.  vmpressure() schedules vmpr->work where vmpr is
embedded in mem_cgroup but I can't find where it's flushed / canceled?
What prevents the memcg going away while the work item is pending or
in flight?

Thanks.

-- 
tejun
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