reproduce (this is a W=1 build):
        git checkout dc1dea796b197aba2c3cae25bfef45f4b3ad46fe
        b4 shazam https://lore.kernel.org/r/20250924-mq-cake-sub-qdisc-v1-4-43a060d1112a@redhat.com
        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=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash