kconfig: import list_move(_tail) and list_for_each_entry_reverse macros

Import more macros from include/linux/list.h.

These will be used in the next commit.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

diff --git a/scripts/kconfig/list.h b/scripts/kconfig/list.h
index 882859ddf9f4f94cba26f3d5ab41fe9be04448d4..409201cd495b5a06ef03d3ea087a3c5ef20af977 100644 (file)
--- a/scripts/kconfig/list.h
+++ b/scripts/kconfig/list.h
@@ -127,6 +127,29 @@ static inline void list_del(struct list_head *entry)
        entry->prev = LIST_POISON2;
 }
 
+/**
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+       __list_del_entry(list);
+       list_add(list, head);
+}
+
+/**
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+                                 struct list_head *head)
+{
+       __list_del_entry(list);
+       list_add_tail(list, head);
+}
+
 /**
  * list_is_head - tests whether @list is the list @head
  * @list: the entry to test
@@ -166,6 +189,17 @@ static inline int list_empty(const struct list_head *head)
 #define list_first_entry(ptr, type, member) \
        list_entry((ptr)->next, type, member)
 
+/**
+ * list_last_entry - get the last element from a list
+ * @ptr:       the list head to take the element from.
+ * @type:      the type of the struct this is embedded in.
+ * @member:    the name of the list_head within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define list_last_entry(ptr, type, member) \
+       list_entry((ptr)->prev, type, member)
+
 /**
  * list_next_entry - get the next element in list
  * @pos:       the type * to cursor
@@ -174,6 +208,14 @@ static inline int list_empty(const struct list_head *head)
 #define list_next_entry(pos, member) \
        list_entry((pos)->member.next, typeof(*(pos)), member)
 
+/**
+ * list_prev_entry - get the prev element in list
+ * @pos:       the type * to cursor
+ * @member:    the name of the list_head within the struct.
+ */
+#define list_prev_entry(pos, member) \
+       list_entry((pos)->member.prev, typeof(*(pos)), member)
+
 /**
  * list_entry_is_head - test if the entry points to the head of the list
  * @pos:       the type * to cursor
@@ -194,6 +236,17 @@ static inline int list_empty(const struct list_head *head)
             !list_entry_is_head(pos, head, member);                    \
             pos = list_next_entry(pos, member))
 
+/**
+ * list_for_each_entry_reverse - iterate backwards over list of given type.
+ * @pos:       the type * to use as a loop cursor.
+ * @head:      the head for your list.
+ * @member:    the name of the list_head within the struct.
+ */
+#define list_for_each_entry_reverse(pos, head, member)                 \
+       for (pos = list_last_entry(head, typeof(*pos), member);         \
+            !list_entry_is_head(pos, head, member);                    \
+            pos = list_prev_entry(pos, member))
+
 /**
  * list_for_each_entry_safe - iterate over list of given type. Safe against removal of list entry
  * @pos:       the type * to use as a loop cursor.