workqueue: implement current_is_workqueue_rescuer()
Implement a function which queries whether it currently is running off a workqueue rescuer. This will be used to convert writeback to workqueue. Signed-off-by: Tejun Heo <tj@kernel.org>
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@@ -451,6 +451,7 @@ extern bool cancel_delayed_work_sync(struct delayed_work *dwork);
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extern void workqueue_set_max_active(struct workqueue_struct *wq,
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int max_active);
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extern bool current_is_workqueue_rescuer(void);
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extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
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extern unsigned int work_busy(struct work_struct *work);
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