reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add atorgue-stm32 https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git
        git fetch atorgue-stm32 stm32-next
        git checkout atorgue-stm32/stm32-next
        b4 shazam https://lore.kernel.org/r/20240111152712.1842790-2-valentin.caron@foss.st.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/tty/serial/