From mboxrd@z Thu Jan 1 00:00:00 1970 From: "=?UTF-8?q?Christian=20K=C3=B6nig?=" Subject: [PATCH 1/2] list: introduce list_bulk_move_tail helper Date: Thu, 13 Sep 2018 13:22:07 +0200 Message-ID: <20180913112208.1353-1-christian.koenig@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org List-Id: amd-gfx.lists.freedesktop.org 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 --- 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