vm_object_reference_locked
vm_object_reference_locked(mmap->bufobj); // kernel and userland both
vm_object_reference_locked(obj);
vm_object_reference_locked(obj);
vm_object_reference_locked(fs.first_object);
vm_object_reference_locked(src_object);
vm_object_reference_locked(result);
vm_object_reference_locked(backing_object);
void vm_object_reference_locked(vm_object_t);
vm_object_reference_locked(object);
vm_object_reference_locked(object);