__llist_add
__llist_add(&page->pcp_llist, free_pages);
__llist_add(obj, &c->free_llist);
if (__llist_add(llnode, &c->free_by_rcu))
__llist_add(llnode, &c->free_llist);
if (__llist_add(llnode, &c->free_by_rcu))
__llist_add(&ri->llist, ¤t->kretprobe_instances);
__llist_add(&node->llist, ¤t->rethooks);