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/* SPDX-License-Identifier: GPL-2.0 */
struct list {
struct list *next, *prev;
};
static inline void
list_init(struct list *list)
{
list->next = list;
list->prev = list;
}
static inline int
list_empty(struct list *list)
{
return list->next == list;
}
static inline void
list_insert(struct list *link, struct list *new_link)
{
new_link->prev = link->prev;
new_link->next = link;
new_link->prev->next = new_link;
new_link->next->prev = new_link;
}
static inline void
list_append(struct list *list, struct list *new_link)
{
list_insert((struct list *)list, new_link);
}
static inline void
list_prepend(struct list *list, struct list *new_link)
{
list_insert(list->next, new_link);
}
static inline void
list_remove(struct list *link)
{
link->prev->next = link->next;
link->next->prev = link->prev;
}
#define list_entry(link, type, member) \
((type *)((char *)(link)-(unsigned long)(&((type *)0)->member)))
#define list_head(list, type, member) \
list_entry((list)->next, type, member)
#define list_tail(list, type, member) \
list_entry((list)->prev, type, member)
#define list_next(elm, member) \
list_entry((elm)->member.next, typeof(*elm), member)
#define list_for_each_entry(pos, list, member) \
for (pos = list_head(list, typeof(*pos), member); \
&pos->member != (list); \
pos = list_next(pos, member))
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