On Wed, May 17, 2023 at 06:14:03PM +0800, Hongyu Xie wrote: > --- /dev/null > +++ b/drivers/tty/serial/panic_serial_helper.h > @@ -0,0 +1,12 @@ > +/* SPDX-License-Identifier: GPL > + * > + * panic_serial_helper.h Debug through uart when panic. > + * > + * Copyright (C) 2023 Xie Hongyu <xiehongyu1@xxxxxxxxxx> > + * > + * Inspired by kgdboc. > + */ > +#ifndef __PANIC_SERIAL_HELPER_H > +#define __PANIC_SERIAL_HELPER_H > +/*TODO*/ > +#endif /* __PANIC_SERIAL_HELPER_H */ A whole file that does nothing? confused, greg k-h