reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?id=7451b3cd93b30f714efc83f6571abf8c50541839
        git remote add jaegeuk-f2fs https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git
        git fetch --no-tags jaegeuk-f2fs dev-test
        git checkout 7451b3cd93b30f714efc83f6571abf8c50541839

        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=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash fs/