102         Ok(())  in register()
311         Ok(num_pages)  in register_with_vma()
319             return Ok(());  in use_range()
343                     Ok(()) => {}  in use_range()
352         Ok(())  in use_range()
382             return Ok(());  in use_page_slow()
432         Ok(())  in use_page_slow()
467             return Ok(());  in iterate()
499         Ok(())  in iterate()
537                 Ok(())  in read()
541         Ok(unsafe { out.assume_init() })  in read()
559                 Ok(())  in write()