diff options
Diffstat (limited to 'include/linux/list.h')
| -rw-r--r-- | include/linux/list.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index e7e28afd28f8..7f7657e41620 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -637,6 +637,20 @@ static inline void list_splice_tail_init(struct list_head *list, }) /** + * list_last_entry_or_null - get the last 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_head within the struct. + * + * Note that if the list is empty, it returns NULL. + */ +#define list_last_entry_or_null(ptr, type, member) ({ \ + struct list_head *head__ = (ptr); \ + struct list_head *pos__ = READ_ONCE(head__->prev); \ + pos__ != head__ ? list_entry(pos__, type, member) : NULL; \ +}) + +/** * list_next_entry - get the next element in list * @pos: the type * to cursor * @member: the name of the list_head within the struct. |