reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/06196ddaa223ca1846bf133c6c24e1db2a82a962
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc ksyms-tune
        git checkout 06196ddaa223ca1846bf133c6c24e1db2a82a962

        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-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=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=riscv prepare