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authorJiri Pirko <jiri@resnulli.us>2013-05-29 05:02:56 +0000
committerDavid S. Miller <davem@davemloft.net>2013-05-31 17:31:52 -0700
commit6d7581e62f8be462440d7b22c6361f7c9fa4902b (patch)
tree0f85824301b8a252ffe5a4e88288191c46cd98b2 /include/linux/list.h
parente4e8536f65b51ce91c30588b0925872bdfc60d03 (diff)
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list: introduce list_first_entry_or_null
non-rcu variant of list_first_or_null_rcu Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/list.h')
-rw-r--r--include/linux/list.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h
index 6a1f8df9144b..b83e5657365a 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -362,6 +362,17 @@ static inline void list_splice_tail_init(struct list_head *list,
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.
* @head: the head for your list.