From b862815c3ee7b49ec20a9ab25da55a5f0bcbb95e Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jiri@mellanox.com>
Date: Fri, 3 Feb 2017 10:29:05 +0100
Subject: [PATCH] list: introduce list_for_each_entry_from_reverse helper

Similar to list_for_each_entry_continue and its reverse variant
list_for_each_entry_continue_reverse, introduce reverse helper for
list_for_each_entry_from.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 include/linux/list.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index d1039ecaf94f..ae537fa46216 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -526,6 +526,19 @@ static inline void list_splice_tail_init(struct list_head *list,
 	for (; &pos->member != (head);					\
 	     pos = list_next_entry(pos, member))
 
+/**
+ * list_for_each_entry_from_reverse - iterate backwards over list of given type
+ *                                    from the current point
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_head within the struct.
+ *
+ * Iterate backwards over list of given type, continuing from current position.
+ */
+#define list_for_each_entry_from_reverse(pos, head, member)		\
+	for (; &pos->member != (head);					\
+	     pos = list_prev_entry(pos, member))
+
 /**
  * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
  * @pos:	the type * to use as a loop cursor.
-- 
2.30.2