reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv-linux-gnu
        # clang-22 might not be officially released. Try a lower version if installation fails.
        # https://github.com/brauner/linux/commit/6e419228d8415c9fc1c6584af7f9ecd5a95bbb20
        git remote add brauner-github https://github.com/brauner/linux.git
        git fetch --no-tags brauner-github work.namespace.file_handles
        git checkout 6e419228d8415c9fc1c6584af7f9ecd5a95bbb20
        # 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