[PATCH -mm] [2/3] add list_merge to list.h
From: Nate Diller
Date: Thu Aug 03 2006 - 22:13:02 EST
list_merge behaves like list_splice, except it can be used with
headless lists. that is, the resulting list will have @head
immediately preceeding @list.
This is used by the contig list feature in the Elevator I/O scheduler
Signed-off-by: Nate Diller <nate.diller@xxxxxxxxx>
list.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff -urpN -X dontdiff linux-2.6.18-rc1-mm2/include/linux/list.h
--- linux-2.6.18-rc1-mm2/include/linux/list.h 2006-07-18
+++ linux-dput/include/linux/list.h 2006-08-03 18:42:00.000000000 -0700
@@ -357,6 +357,27 @@ static inline void list_splice_init(stru
+ * list_merge - merge two headless lists
+ * @list: the new list to merge.
+ * @head: the place to add it in the first list.
+ * This is similar to list_splice(), except it merges every item onto @list,
+ * not excluding @head itself. It is a noop if @head already immediately
+ * preceeds @list.
+static inline void list_merge(struct list_head *list, struct list_head *head)
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+ list->prev = head;
+ head->next = list;
+ last->next = at;
+ at->prev = last;
* list_entry - get the struct for this entry
* @ptr: the &struct list_head pointer.
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