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list: introduce list_bulk_move_tail helper

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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 the list.

Used as a band aid in TTM, but better placed in the common list headers.

Acked-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-09-13 11:17:23 +02:00 • committed by Alex Deucher
parent a553c19d15
commit df2fc43d09
2 changed files with 28 additions and 20 deletions
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23
include/linux/list.h
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@ -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