1 files changed, 12 insertions, 7 deletions

diff --git a/include/linux/list.h b/include/linux/list.h
index dac16f99c701..08cf4f651889 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -1,8 +1,6 @@
 #ifndef _LINUX_LIST_H
 #define _LINUX_LIST_H
 
-#ifdef __KERNEL__
-
 #include <linux/stddef.h>
 #include <linux/poison.h>
 #include <linux/prefetch.h>
@@ -319,7 +317,16 @@ static inline int list_empty_careful(const struct list_head *head)
         return (next == head) && (next == head->prev);
 }
 
-static inline void __list_splice(struct list_head *list,
+/**
+ * list_is_singular - tests whether a list has just one entry.
+ * @head: the list to test.
+ */
+static inline int list_is_singular(const struct list_head *head)
+{
+        return !list_empty(head) && (head->next == head->prev);
+}
+
+static inline void __list_splice(const struct list_head *list,
                                  struct list_head *head)
 {
         struct list_head *first = list->next;
@@ -338,7 +345,8 @@ static inline void __list_splice(struct list_head *list,
  * @list: the new list to add.
  * @head: the place to add it in the first list.
  */
-static inline void list_splice(struct list_head *list, struct list_head *head)
+static inline void list_splice(const struct list_head *list,
+                                struct list_head *head)
 {
         if (!list_empty(list))
                 __list_splice(list, head);
@@ -973,7 +981,4 @@ static inline void hlist_add_after_rcu(struct hlist_node *prev,
                 ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
              pos = rcu_dereference(pos->next))
 
-#else
-#warning "don't include kernel headers in userspace"
-#endif /* __KERNEL__ */
 #endif