BT_TYPE_SPAN_STATIC
rv = vmem_add1(vm, addr, size, flags, BT_TYPE_SPAN_STATIC);
[BT_TYPE_SPAN_STATIC] = "static span",
spanbttype == BT_TYPE_SPAN_STATIC);
KASSERT(bt->bt_type == BT_TYPE_SPAN_STATIC);
#define BT_ISSPAN_P(bt) ((bt)->bt_type <= BT_TYPE_SPAN_STATIC)