linux-kernel - [PATCH] [RSDL 1/6] lists: add list splice tail

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Message-Id: <200703041802.13991.kernel@kolivas.org>
Date:	Sun, 4 Mar 2007 18:02:13 +1100
From:	Con Kolivas <kernel@...ivas.org>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	ck list <ck@....kolivas.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH] [RSDL 1/6] lists: add list splice tail

Add a list_splice_tail variant of list_splice.

Patch-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Con Kolivas <kernel@...ivas.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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