[PATCH] workqueue: Implement delayed_work_busy()

[Alex Naidis <alex.naidis@linux.com>]

This implements a variant of work_busy() for
delayed work.

CC: linux-kernel@vger.kernel.org
Signed-off-by: Alex Naidis <alex.naidis@linux.com>
---
 include/linux/workqueue.h | 1 +
 kernel/workqueue.c        | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index c102ef6..32ab046 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -467,6 +467,7 @@ extern void workqueue_set_max_active(struct workqueue_struct *wq,
 extern bool current_is_workqueue_rescuer(void);
 extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
 extern unsigned int work_busy(struct work_struct *work);
+extern unsigned int delayed_work_busy(struct delayed_work *dwork);
 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
 extern void show_workqueue_state(void);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c74bf39..658cc2e 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4224,6 +4224,15 @@ unsigned int work_busy(struct work_struct *work)
 }
 EXPORT_SYMBOL_GPL(work_busy);
 
+/*
+ * See work_busy()
+ */
+unsigned int delayed_work_busy(struct delayed_work *dwork)
+{
+	return work_busy(&dwork->work);
+}
+EXPORT_SYMBOL_GPL(delayed_work_busy);
+
 /**
  * set_worker_desc - set description for the current work item
  * @fmt: printf-style format string
-- 
2.7.4