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kthread_worker: reimplement flush_kthread_work() to allow freeing the…
… work item being executed kthread_worker provides minimalistic workqueue-like interface for users which need a dedicated worker thread (e.g. for realtime priority). It has basic queue, flush_work, flush_worker operations which mostly match the workqueue counterparts; however, due to the way flush_work() is implemented, it has a noticeable difference of not allowing work items to be freed while being executed. While the current users of kthread_worker are okay with the current behavior, the restriction does impede some valid use cases. Also, removing this difference isn't difficult and actually makes the code easier to understand. This patch reimplements flush_kthread_work() such that it uses a flush_work item instead of queue/done sequence numbers. Signed-off-by: Tejun Heo <firstname.lastname@example.org>
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