diff options
Diffstat (limited to 'include/linux/list.h')
| -rw-r--r-- | include/linux/list.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/list.h b/include/linux/list.h index 58aa3adf94e6..d3b4db895340 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -151,6 +151,23 @@ static inline void list_replace_init(struct list_head *old, } /** + * list_swap - replace entry1 with entry2 and re-add entry1 at entry2's position + * @entry1: the location to place entry2 + * @entry2: the location to place entry1 + */ +static inline void list_swap(struct list_head *entry1, + struct list_head *entry2) +{ + struct list_head *pos = entry2->prev; + + list_del(entry2); + list_replace(entry1, entry2); + if (pos == entry1) + pos = entry2; + list_add(entry1, pos); +} + +/** * list_del_init - deletes entry from list and reinitialize it. * @entry: the element to delete from the list. */ @@ -271,6 +288,24 @@ static inline void list_rotate_left(struct list_head *head) } /** + * list_rotate_to_front() - Rotate list to specific item. + * @list: The desired new front of the list. + * @head: The head of the list. + * + * Rotates list so that @list becomes the new front of the list. + */ +static inline void list_rotate_to_front(struct list_head *list, + struct list_head *head) +{ + /* + * Deletes the list head from the list denoted by @head and + * places it as the tail of @list, this effectively rotates the + * list so that @list is at the front. + */ + list_move_tail(head, list); +} + +/** * list_is_singular - tests whether a list has just one entry. * @head: the list to test. */ |