list: introduce list_for_each_continue()

As other *continue() helpers, this continues iteration from a given
position.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/include/linux/list.h b/include/linux/list.h
index 85c92555e31f85f019354e54d6efb8e79c2aee17..3c391bbd03c3fe5c76ad86d82da195d6f47bd8e2 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -538,6 +538,16 @@ static inline void list_splice_tail_init(struct list_head *list,
 #define list_for_each(pos, head) \
        for (pos = (head)->next; pos != (head); pos = pos->next)
 
+/**
+ * list_for_each_continue - continue iteration over a list
+ * @pos:       the &struct list_head to use as a loop cursor.
+ * @head:      the head for your list.
+ *
+ * Continue to iterate over a list, continuing after the current position.
+ */
+#define list_for_each_continue(pos, head) \
+       for (pos = pos->next; pos != (head); pos = pos->next)
+
 /**
  * list_for_each_prev  -       iterate over a list backwards
  * @pos:       the &struct list_head to use as a loop cursor.