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/torvalds/linux.git/commit/?id=79a4e91d1bb2a411a4ce2baa93680fa707567003
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 79a4e91d1bb2a411a4ce2baa93680fa707567003
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.4.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.4.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/lib/ drivers/clocksource/ drivers/hwmon/ drivers/hwtracing/intel_th/ drivers/i2c/busses/ drivers/input/joystick/ drivers/input/touchscreen/ drivers/leds/ drivers/power/supply/ drivers/thermal/ dtbs fs/gfs2/ kernel/ security/