[LIST]: Introduce list_for_each_entry_safe_from

For iterate over list of given type from existing point safe against removal of
list entry.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/list.h b/include/linux/list.h
index 47208bd99f9e1c2ef6753e4b7d56739691531576..beb6e48e116ff5e0cef22f2109ace0d5335bc63d 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -437,6 +437,19 @@ static inline void list_splice_init(struct list_head *list,
             &pos->member != (head);                                            \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))
 
+/**
+ * list_for_each_entry_safe_from - iterate over list of given type
+ *                     from existing point safe against removal of list entry
+ * @pos:       the type * to use as a loop counter.
+ * @n:         another type * to use as temporary storage
+ * @head:      the head for your list.
+ * @member:    the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe_from(pos, n, head, member)                    \
+       for (n = list_entry(pos->member.next, typeof(*pos), member);            \
+            &pos->member != (head);                                            \
+            pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
 /**
  * list_for_each_entry_safe_reverse - iterate backwards over list of given type safe against
  *                                   removal of list entry