reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=a60eb2a07b5eb5064a5636204550c1df87d20751
        git remote add axboe-block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git
        git fetch --no-tags axboe-block rw_iter
        git checkout a60eb2a07b5eb5064a5636204550c1df87d20751
        # 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 arch/powerpc/kvm/ arch/powerpc/platforms/cell/spufs/ arch/powerpc/platforms/powernv/ arch/powerpc/platforms/pseries/ drivers/char/ drivers/edac/ drivers/macintosh/ drivers/misc/ocxl/ drivers/scsi/cxlflash/ virt/