vm_object_busied
KASSERT(!vm_object_busied(object),
#define VM_OBJECT_ASSERT_BUSY(object) MPASS(vm_object_busied((object)))
if (obj != NULL && vm_object_busied(obj)) {
if (obj != NULL && vm_object_busied(obj))
if (obj != NULL && vm_object_busied(obj)) {
if (obj != NULL && vm_object_busied(obj)) {
!vm_object_busied(m->object))