[RFC PATCH 3/5] Add list_for_each_entry_reverse_from()

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

Introduce list_for_each_entry_reverse_from() needed by a subsequent patch.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
 include/linux/list.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -562,6 +562,19 @@ static inline void list_splice_init_rcu(
 	     pos = list_entry(pos->member.next, typeof(*pos), member))
 
 /**
+ * list_for_each_entry_reverse_from - 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_struct within the struct.
+ *
+ * Iterate backwards over list of given type, continuing from current position.
+ */
+#define list_for_each_entry_reverse_from(pos, head, member)		\
+	for (; prefetch(pos->member.prev), &pos->member != (head);	\
+	     pos = list_entry(pos->member.prev, typeof(*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