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author | Christian König <christian.koenig@amd.com> | 2018-09-13 11:17:23 +0200 |
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committer | Alex Deucher <alexander.deucher@amd.com> | 2018-10-10 15:20:54 -0500 |
commit | df2fc43d09d3ee5ede82cab9299df5e78aa427b5 (patch) | |
tree | cb487e12ebde6c70e8877d99871296fe1947c331 /include/linux/list.h | |
parent | a553c19d158535a62b513f5a9ef9f036a54b511f (diff) | |
download | linux-df2fc43d09d3ee5ede82cab9299df5e78aa427b5.tar.gz linux-df2fc43d09d3ee5ede82cab9299df5e78aa427b5.tar.bz2 linux-df2fc43d09d3ee5ede82cab9299df5e78aa427b5.zip |
list: introduce list_bulk_move_tail helper
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>
Diffstat (limited to 'include/linux/list.h')
-rw-r--r-- | include/linux/list.h | 23 |
1 files changed, 23 insertions, 0 deletions
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 @@ -184,6 +184,29 @@ static inline void list_move_tail(struct list_head *list, } /** + * 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 * @head: the head of the list |