[PATCH 1/4] list: introduce list_is_first()
From: Geliang Tang <hidden>
Date: 2015-12-10 14:21:28
Also in:
lkml, netfilter-devel
Subsystem:
the rest · Maintainer:
Linus Torvalds
We already have list_is_last(), it makes sense to also add list_is_first() for consistency. This list utility function to check for first element in a list. Signed-off-by: Geliang Tang <redacted> --- include/linux/list.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h
index 5356f4d..2c43ef4 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h@@ -170,6 +170,17 @@ static inline void list_move_tail(struct list_head *list, } /** + * list_is_first - tests whether @list is the first entry in list @head + * @list: the entry to test + * @head: the head of the list + */ +static inline int list_is_first(const struct list_head *list, + const struct list_head *head) +{ + return list->prev == head; +} + +/** * list_is_last - tests whether @list is the last entry in list @head * @list: the entry to test * @head: the head of the list
--
2.5.0