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Subject[PATCH] [RSDL 1/6] lists: add list splice tail
Date
Add a list_splice_tail variant of list_splice.

Patch-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Con Kolivas <kernel@kolivas.org>

---
include/linux/list.h | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
Index: linux-2.6.20-rsdl/include/linux/list.h
===================================================================
--- linux-2.6.20-rsdl.orig/include/linux/list.h 2007-03-04 17:30:25.000000000 +1100
+++ linux-2.6.20-rsdl/include/linux/list.h 2007-03-04 17:30:30.000000000 +1100
@@ -332,6 +332,20 @@ static inline void __list_splice(struct
at->prev = last;
}

+static inline void __list_splice_tail(struct list_head *list,
+ struct list_head *head)
+{
+ struct list_head *first = list->next;
+ struct list_head *last = list->prev;
+ struct list_head *at = head->prev;
+
+ first->prev = at;
+ at->next = first;
+
+ last->next = head;
+ head->prev = last;
+}
+
/**
* list_splice - join two lists
* @list: the new list to add.
@@ -344,6 +358,18 @@ static inline void list_splice(struct li
}

/**
+ * list_splice_tail - join two lists at one's tail
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice_tail(struct list_head *list,
+ struct list_head *head)
+{
+ if (!list_empty(list))
+ __list_splice_tail(list, head);
+}
+
+/**
* list_splice_init - join two lists and reinitialise the emptied list.
* @list: the new list to add.
* @head: the place to add it in the first list.
@@ -360,6 +386,22 @@ static inline void list_splice_init(stru
}

/**
+ * list_splice_init - join two lists at one's tail and reinitialise emptied
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_tail_init(struct list_head *list,
+ struct list_head *head)
+{
+ if (!list_empty(list)) {
+ __list_splice_tail(list, head);
+ INIT_LIST_HEAD(list);
+ }
+}
+
+/**
* list_entry - get the struct for this entry
* @ptr: the &struct list_head pointer.
* @type: the type of the struct this is embedded in.
--
-ck
-
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