| From | Ben Hutchings <> | Date | Sat, 11 Mar 2017 15:15:48 +0000 | Subject | [PATCH 3.2 201/202] list: introduce list_first_entry_or_null |
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3.2.87-rc2 review patch. If anyone has any objections, please let me know.
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From: Jiri Pirko <jiri@resnulli.us>
commit 6d7581e62f8be462440d7b22c6361f7c9fa4902b upstream.
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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- include/linux/list.h | 11 +++++++++++ 1 file changed, 11 insertions(+)
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.
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