[PATCH] list.h: add list_for_each_struct_entry macro

From: Jiri Pirko
Date: Mon Jan 18 2010 - 11:23:55 EST

When preparing to upcoming migration of mc_list (list of multicast MACs)
to list_head, the need of traversing the list over one structure member
appeared. I thought I'll do it locally but I decided that an intruduction
the macro in list.h would be much clearer. Please kindly for a review.


Signed-off-by: Jiri Pirko <jpirko@xxxxxxxxxx>

diff --git a/include/linux/list.h b/include/linux/list.h
index 969f6e9..8350a94 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -420,6 +420,22 @@ static inline void list_splice_tail_init(struct list_head *list,
pos = list_entry(pos->member.prev, typeof(*pos), member))

+ * list_for_each_struct_entry - iterate over list of given type using
+ * the struct member.
+ * @pos: the type * to use as a loop cursor.
+ * @head: the head for your list.
+ * @type: the type of the struct.
+ * @posmember: the name ot the loop cursor within the struct.
+ * @member: the name of the list_struct within the struct.
+ */
+#define list_for_each_struct_entry(pos, head, type, posmember, member) \
+ for (pos = list_entry((head)->next, type, member)->posmember; \
+ prefetch(container_of(pos, type, posmember)->member.next), \
+ &container_of(pos, type, posmember)->member != (head); \
+ pos = list_entry(container_of(pos, type, posmember)->member.next, \
+ type, member)->posmember)
* list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
* @pos: the type * to use as a start point
* @head: the head of the list
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