order_objects
maxobj = order_objects(slab_order(slab), s->size);
max_objects = order_objects(slab_order(slab), s->size);
(order << OO_SHIFT) + order_objects(order, size)
max_objects = max(order_objects(slub_max_order, size), 1U);
if (order_objects(min_order, size) > MAX_OBJS_PER_PAGE)