reproduce (this is a W=1 build):
        # https://github.com/masneyb/linux/commit/d29088009b4afdb7fc1f3cbb6ba3364e483b17d9
        git remote add masneyb https://github.com/masneyb/linux
        git fetch --no-tags masneyb clk-misc-round-two-for-v7.3
        git checkout d29088009b4afdb7fc1f3cbb6ba3364e483b17d9

        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # clang-24 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=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/clk/mediatek/