The return values of timerqueue_add/del() are not documented in the kernel doc
comment. Add proper documentation.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org> 
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 lib/timerqueue.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Index: b/lib/timerqueue.c
===================================================================
--- a/lib/timerqueue.c
+++ b/lib/timerqueue.c
@@ -33,8 +33,9 @@
  * @head: head of timerqueue
  * @node: timer node to be added
  *
- * Adds the timer node to the timerqueue, sorted by the
- * node's expires value.
+ * Adds the timer node to the timerqueue, sorted by the node's expires
+ * value. Returns true if the newly added timer is the first expiring timer in
+ * the queue.
  */
 bool timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node)
 {
@@ -70,7 +71,8 @@ EXPORT_SYMBOL_GPL(timerqueue_add);
  * @head: head of timerqueue
  * @node: timer node to be removed
  *
- * Removes the timer node from the timerqueue.
+ * Removes the timer node from the timerqueue. Returns true if the queue is
+ * not empty after the remove.
  */
 bool timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node)
 {