reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        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/20230911120203.774632-10-gatien.chevallier@foss.st.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/char/hw_random/ drivers/gpu/drm/tiny/