diff options
Diffstat (limited to 'scripts/kconfig/list.h')
| -rw-r--r-- | scripts/kconfig/list.h | 91 | 
1 files changed, 91 insertions, 0 deletions
diff --git a/scripts/kconfig/list.h b/scripts/kconfig/list.h new file mode 100644 index 00000000000..0ae730be5f4 --- /dev/null +++ b/scripts/kconfig/list.h @@ -0,0 +1,91 @@ +#ifndef LIST_H +#define LIST_H + +/* + * Copied from include/linux/... + */ + +#undef offsetof +#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) + +/** + * container_of - cast a member of a structure out to the containing structure + * @ptr:        the pointer to the member. + * @type:       the type of the container struct this is embedded in. + * @member:     the name of the member within the struct. + * + */ +#define container_of(ptr, type, member) ({                      \ +	const typeof( ((type *)0)->member ) *__mptr = (ptr);    \ +	(type *)( (char *)__mptr - offsetof(type,member) );}) + + +struct list_head { +	struct list_head *next, *prev; +}; + + +#define LIST_HEAD_INIT(name) { &(name), &(name) } + +#define LIST_HEAD(name) \ +	struct list_head name = LIST_HEAD_INIT(name) + +/** + * list_entry - get the struct for this entry + * @ptr:	the &struct list_head pointer. + * @type:	the type of the struct this is embedded in. + * @member:	the name of the list_struct within the struct. + */ +#define list_entry(ptr, type, member) \ +	container_of(ptr, type, member) + +/** + * list_for_each_entry	-	iterate 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_struct within the struct. + */ +#define list_for_each_entry(pos, head, member)				\ +	for (pos = list_entry((head)->next, typeof(*pos), member);	\ +	     &pos->member != (head); 	\ +	     pos = list_entry(pos->member.next, typeof(*pos), member)) + +/** + * list_empty - tests whether a list is empty + * @head: the list to test. + */ +static inline int list_empty(const struct list_head *head) +{ +	return head->next == head; +} + +/* + * Insert a new entry between two known consecutive entries. + * + * This is only for internal list manipulation where we know + * the prev/next entries already! + */ +static inline void __list_add(struct list_head *_new, +			      struct list_head *prev, +			      struct list_head *next) +{ +	next->prev = _new; +	_new->next = next; +	_new->prev = prev; +	prev->next = _new; +} + +/** + * list_add_tail - add a new entry + * @new: new entry to be added + * @head: list head to add it before + * + * Insert a new entry before the specified head. + * This is useful for implementing queues. + */ +static inline void list_add_tail(struct list_head *_new, struct list_head *head) +{ +	__list_add(_new, head->prev, head); +} + +#endif  |