llist: Return whether list is empty before adding in llist_add()

[pandora-kernel.git] / lib / llist.c

diff --git a/lib/llist.c b/lib/llist.c
index 6c69f1d..878985c 100644 (file)
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -34,8 +34,10 @@
  * @new_first: first entry in batch to be added
  * @new_last:  last entry in batch to be added
  * @head:      the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
  */
-void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
+bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
                     struct llist_head *head)
 {
        struct llist_node *entry, *old_entry;
@@ -49,6 +51,8 @@ void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
                        break;
                cpu_relax();
        }
+
+       return old_entry == NULL;
 }
 EXPORT_SYMBOL_GPL(llist_add_batch);