summaryrefslogtreecommitdiff
path: root/include/linux/list.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/list.h')
-rw-r--r--include/linux/list.h47
1 files changed, 38 insertions, 9 deletions
diff --git a/include/linux/list.h b/include/linux/list.h
index 453916bc0412..a886f27a1181 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -215,21 +215,21 @@ static inline int list_is_singular(const struct list_head *head)
}
static inline void __list_splice(const struct list_head *list,
- struct list_head *head)
+ struct list_head *prev,
+ struct list_head *next)
{
struct list_head *first = list->next;
struct list_head *last = list->prev;
- struct list_head *at = head->next;
- first->prev = head;
- head->next = first;
+ first->prev = prev;
+ prev->next = first;
- last->next = at;
- at->prev = last;
+ last->next = next;
+ next->prev = last;
}
/**
- * list_splice - join two lists
+ * list_splice - join two lists, this is designed for stacks
* @list: the new list to add.
* @head: the place to add it in the first list.
*/
@@ -237,7 +237,19 @@ static inline void list_splice(const struct list_head *list,
struct list_head *head)
{
if (!list_empty(list))
- __list_splice(list, head);
+ __list_splice(list, head, head->next);
+}
+
+/**
+ * list_splice_tail - join two lists, each list being a queue
+ * @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(list, head->prev, head);
}
/**
@@ -251,7 +263,24 @@ static inline void list_splice_init(struct list_head *list,
struct list_head *head)
{
if (!list_empty(list)) {
- __list_splice(list, head);
+ __list_splice(list, head, head->next);
+ INIT_LIST_HEAD(list);
+ }
+}
+
+/**
+ * list_splice_tail_init - join two lists, each list being a queue, and
+ * reinitialise the emptied list.
+ * @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(list, head->prev, head);
INIT_LIST_HEAD(list);
}
}