reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev.git/commit/?id=6f366e86481a7503a821de82930df517dddd4047
        git remote add deller-fbdev https://git.kernel.org/pub/scm/linux/kernel/git/deller/linux-fbdev.git
        git fetch --no-tags deller-fbdev fbdev-7.0-2
        git checkout 6f366e86481a7503a821de82930df517dddd4047

        # install mips cross compiling tool for clang build
        # apt-get install binutils-mips64-linux-gnuabi64
        # clang-23 might not be officially released. Try a lower version if installation fails.
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/video/fbdev/