From 8bf0cdfac7f8aa3fa6151b5c5f5eebdb44a64e89 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Thu, 21 Sep 2023 11:32:58 +0200 Subject: [PATCH] : Introduce the list_for_each_reverse() method The list_head counterpart of list_for_each_entry_reverse() was missing, add it to complete the list handling APIs in . [ This new API is also relied on by a WIP scheduler patch, so this variant is not a theoretical possibility only. ] Signed-off-by: Ingo Molnar Cc: Linus Torvalds Cc: linux-kernel@vger.kernel.org --- include/linux/list.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/list.h b/include/linux/list.h index 164b4d0e9d2ae..1837caedf7231 100644 --- a/include/linux/list.h +++ b/include/linux/list.h @@ -686,6 +686,14 @@ static inline void list_splice_tail_init(struct list_head *list, #define list_for_each(pos, head) \ for (pos = (head)->next; !list_is_head(pos, (head)); pos = pos->next) +/** + * list_for_each_reverse - iterate backwards over a list + * @pos: the &struct list_head to use as a loop cursor. + * @head: the head for your list. + */ +#define list_for_each_reverse(pos, head) \ + for (pos = (head)->prev; pos != (head); pos = pos->prev) + /** * list_for_each_rcu - Iterate over a list in an RCU-safe fashion * @pos: the &struct list_head to use as a loop cursor. -- 2.30.2