unplugged_pages
static LIST_HEAD(unplugged_pages);
struct unplugged_pages *unplugged;
if (list_empty(&unplugged_pages))
unplugged = list_entry(unplugged_pages.next,
struct unplugged_pages, list);
list_add(&unplugged->list, &unplugged_pages);
struct list_head *entry = unplugged_pages.next;
struct unplugged_pages,