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>

1 files changed, 13 insertions, 0 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c82feac0a878..f5c8bbb9ada3 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4072,6 +4072,19 @@ void workqueue_set_max_active(struct workqueue_struct *wq, int max_active)
 EXPORT_SYMBOL_GPL(workqueue_set_max_active);
 
 /**
+ * current_is_workqueue_rescuer - is %current workqueue rescuer?
+ *
+ * Determine whether %current is a workqueue rescuer.  Can be used from
+ * work functions to determine whether it's being run off the rescuer task.
+ */
+bool current_is_workqueue_rescuer(void)
+{
+        struct worker *worker = current_wq_worker();
+
+        return worker && worker == worker->current_pwq->wq->rescuer;
+}
+
+/**
  * workqueue_congested - test whether a workqueue is congested
  * @cpu: CPU in question
  * @wq: target workqueue