reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/riteshharjani/linux/commit/c8318dd2a63c230e5e731bc14750a466d7891ddc
        git remote add riteshharjani https://github.com/riteshharjani/linux
        git fetch --no-tags riteshharjani notmuch-cover.1708709155.git.john@groves.net
        git checkout c8318dd2a63c230e5e731bc14750a466d7891ddc
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-13.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash fs/