reproduce (this is a W=1 build):
        # https://github.com/omap-audio/linux-audio/commit/a00547a3d28f0c0c83cae73c54f82a569898abd2
        git remote add omap-audio https://github.com/omap-audio/linux-audio
        git fetch --no-tags omap-audio peter/linux-next-wip
        git checkout a00547a3d28f0c0c83cae73c54f82a569898abd2

        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # clang-22 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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash dtbs_check