Add list_exactly_one() and list_more_than_one() utility functions

diff --git a/include/lib/list.h b/include/lib/list.h
index 41f3678..fda023c 100644 (file)
--- a/include/lib/list.h
+++ b/include/lib/list.h
@@ -132,6 +132,24 @@ static inline int list_empty(const struct list_head* head)
        return head->next == head;
 }
 
+/**
+ * list_exactly_one - tests whether a list has exactly one element
+ * @head: the list to test.
+ */
+static inline int list_exactly_one(const struct list_head* head)
+{
+       return head->next == head->prev;
+}
+
+/**
+ * list_more_than_one - tests whether a list has more than one element
+ * @head: the list to test.
+ */
+static inline int list_more_than_one(const struct list_head* head)
+{
+       return head->next != head->prev;
+}
+
 /**
  * list_rotate_left - rotate the list to the left
  * @head: the head of the list