reproduce (this is a W=1 build):
        git remote add tty https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
        git fetch tty tty-testing
        git checkout tty/tty-testing
        b4 shazam https://lore.kernel.org/r/20250819191314.3452283-1-adriana@arista.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/tty/serial/8250/