---

yaml --- r: 376678 b: refs/heads/master c: 6d7581e h: refs/heads/master v: v3
git-mirror · Jun 1, 2013 · dc9c5fb · dc9c5fb
1 parent 209c416
commit dc9c5fb
Show file tree

Hide file tree

Showing 2 changed files with 12 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e4e8536f65b51ce91c30588b0925872bdfc60d03
+refs/heads/master: 6d7581e62f8be462440d7b22c6361f7c9fa4902b
diff --git a/trunk/include/linux/list.h b/trunk/include/linux/list.h
@@ -361,6 +361,17 @@ static inline void list_splice_tail_init(struct list_head *list,
 #define list_first_entry(ptr, type, member) \
 	list_entry((ptr)->next, type, member)
 
+/**
+ * list_first_entry_or_null - get the first element from a list
+ * @ptr:	the list head to take the element from.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Note that if the list is empty, it returns NULL.
+ */
+#define list_first_entry_or_null(ptr, type, member) \
+	(!list_empty(ptr) ? list_first_entry(ptr, type, member) : NULL)
+
 /**
  * list_for_each	-	iterate over a list
  * @pos:	the &struct list_head to use as a loop cursor.