On Thu, Sep 13, 2018 at 01:22:07PM +0200, Christian König wrote:
Move all entries between @first and including @last before @head.
This is useful for LRU lists where a whole block of entries should be moved to the end of an list.
Signed-off-by: Christian König christian.koenig@amd.com
Bulk move helper is useful for TTM driver to improve the LRU moving efficiency. Please go on with my RB.
Series are Reviewed-and-Tested-by: Huang Rui ray.huang@amd.com
include/linux/list.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/include/linux/list.h b/include/linux/list.h index de04cc5ed536..edb7628e46ed 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -183,6 +183,29 @@ static inline void list_move_tail(struct list_head *list, list_add_tail(list, head); }
+/**
- list_bulk_move_tail - move a subsection of a list to its tail
- @head: the head that will follow our entry
- @first: first entry to move
- @last: last entry to move, can be the same as first
- Move all entries between @first and including @last before @head.
- All three entries must belong to the same linked list.
- */
+static inline void list_bulk_move_tail(struct list_head *head,
struct list_head *first,struct list_head *last)+{
- first->prev->next = last->next;
- last->next->prev = first->prev;
- head->prev->next = first;
- first->prev = head->prev;
- last->next = head;
- head->prev = last;
+}
/**
- list_is_last - tests whether @list is the last entry in list @head
- @list: the entry to test
-- 2.14.1
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