Commit c14a3046 authored by Sami Tolvanen's avatar Sami Tolvanen Committed by Masahiro Yamada
Browse files

scripts: import more list macros 



Import list_is_first, list_is_last, list_replace, and list_replace_init.

Signed-off-by: default avatarSami Tolvanen <samitolvanen@google.com>
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 984ed20e

scripts/include/list.h

+50 −0
Original line number Diff line number Diff line
@@ -127,6 +127,36 @@ static inline void list_del(struct list_head *entry) 
	entry->prev = LIST_POISON2;

}



/**

 * list_replace - replace old entry by new one

 * @old : the element to be replaced

 * @new : the new element to insert

 *

 * If @old was empty, it will be overwritten.

 */

static inline void list_replace(struct list_head *old,

				struct list_head *new)

{

	new->next = old->next;

	new->next->prev = new;

	new->prev = old->prev;

	new->prev->next = new;

}



/**

 * list_replace_init - replace old entry by new one and initialize the old one

 * @old : the element to be replaced

 * @new : the new element to insert

 *

 * If @old was empty, it will be overwritten.

 */

static inline void list_replace_init(struct list_head *old,

				     struct list_head *new)

{

	list_replace(old, new);

	INIT_LIST_HEAD(old);

}



/**

 * list_move - delete from one list and add as another's head

 * @list: the entry to move
@@ -150,6 +180,26 @@ static inline void list_move_tail(struct list_head *list, 
	list_add_tail(list, head);

}



/**

 * list_is_first -- tests whether @list is the first entry in list @head

 * @list: the entry to test

 * @head: the head of the list

 */

static inline int list_is_first(const struct list_head *list, const struct list_head *head)

{

	return list->prev == head;

}



/**

 * list_is_last - tests whether @list is the last entry in list @head

 * @list: the entry to test

 * @head: the head of the list

 */

static inline int list_is_last(const struct list_head *list, const struct list_head *head)

{

	return list->next == head;

}



/**

 * list_is_head - tests whether @list is the list @head

 * @list: the entry to test