Add three list helpers:
list_del_init
list_splice
list_splice_tail
Signed-off-by: Jingbo Xu <[email protected]>
---
include/erofs/list.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/include/erofs/list.h b/include/erofs/list.h
index 3f5da1a..7895ff0 100644
--- a/include/erofs/list.h
+++ b/include/erofs/list.h
@@ -65,11 +65,42 @@ static inline void list_del(struct list_head *entry)
entry->prev = entry->next = NULL;
}
+static inline void list_del_init(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+ init_list_head(entry);
+}
+
static inline int list_empty(struct list_head *head)
{
return head->next == head;
}
+static inline void __list_splice(struct list_head *list,
+ struct list_head *prev, struct list_head *next)
+{
+ struct list_head *first = list->next;
+ struct list_head *last = list->prev;
+
+ first->prev = prev;
+ prev->next = first;
+
+ last->next = next;
+ next->prev = last;
+}
+
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+ if (!list_empty(list))
+ __list_splice(list, head, head->next);
+}
+
+static inline void list_splice_tail(struct list_head *list, struct list_head
*head)
+{
+ if (!list_empty(list))
+ __list_splice(list, head->prev, head);
+}
+
#define list_entry(ptr, type, member) container_of(ptr, type, member)
#define list_first_entry(ptr, type, member)
\
--
2.19.1.6.gb485710b
