net: core: another layer of lists, around PF_MEMALLOC skb handling

		__list_cut_position(list, head, entry);

}

/**

 * list_cut_before - cut a list into two, before given entry

 * @list: a new list to add all removed entries

 * @head: a list with entries

 * @entry: an entry within head, could be the head itself

 *

 * This helper moves the initial part of @head, up to but

 * excluding @entry, from @head to @list.  You should pass

 * in @entry an element you know is on @head.  @list should

 * be an empty list or a list you do not care about losing

 * its data.

 * If @entry == @head, all entries on @head are moved to

 * @list.

 */

static inline void list_cut_before(struct list_head *list,

				   struct list_head *head,

				   struct list_head *entry)

{

	if (head->next == entry) {

		INIT_LIST_HEAD(list);

		return;

	}

	list->next = head->next;

	list->next->prev = list;

	list->prev = entry->prev;

	list->prev->next = list;

	head->next = entry;

	entry->prev = head;

}

static inline void __list_splice(const struct list_head *list,

				 struct list_head *prev,

				 struct list_head *next)