From 64a38525e6b00fa9bab704513b37adf8a89c3f03 Mon Sep 17 00:00:00 2001 From: Samuel Holland Date: Mon, 16 Jun 2025 20:21:35 -0700 Subject: [PATCH] lib: sbi_list: Add a helper for reverse list iteration Some use cases require iterating through a list in both directions. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel Tested-by: Anup Patel Link: https://lore.kernel.org/r/20250617032306.1494528-2-samuel.holland@sifive.com Signed-off-by: Anup Patel --- include/sbi/sbi_list.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/sbi/sbi_list.h b/include/sbi/sbi_list.h index be69fc43..587c655c 100644 --- a/include/sbi/sbi_list.h +++ b/include/sbi/sbi_list.h @@ -173,4 +173,15 @@ static inline void sbi_list_del_init(struct sbi_dlist *entry) &pos->member != (head); \ pos = n, n = sbi_list_entry(pos->member.next, typeof(*pos), member)) +/** + * Iterate over list of given type in reverse order + * @param pos the type * to use as a loop cursor. + * @param head the head for your list. + * @param member the name of the list_struct within the struct. + */ +#define sbi_list_for_each_entry_reverse(pos, head, member) \ + for (pos = sbi_list_entry((head)->prev, typeof(*pos), member); \ + &pos->member != (head); \ + pos = sbi_list_entry(pos->member.prev, typeof(*pos), member)) + #endif