netdev - [patch net-next 15/19] list: introduce list_for_each_entry_from

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Date:   Thu,  2 Feb 2017 16:12:55 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, eladr@...lanox.com,
        mlxsw@...lanox.com, ogerlitz@...lanox.com, jhs@...atatu.com,
        ivecera@...hat.com, jbenc@...hat.com
Subject: [patch net-next 15/19] list: introduce list_for_each_entry_from_reverse helper

From: Jiri Pirko <jiri@...lanox.com>

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@...lanox.com>
Acked-by: Ido Schimmel <idosch@...lanox.com>
---
 include/linux/list.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/list.h b/include/linux/list.h
index d1039ec..ae537fa 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -527,6 +527,19 @@ static inline void list_splice_tail_init(struct list_head *list,
 	     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.
  * @n:		another type * to use as temporary storage
-- 
2.7.4