reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # clang-22 might not be officially released. Try a lower version if installation fails.
        # https://github.com/isilence/linux/commit/e129c6bdfceadeaa4f4fe17524ea24f3c3471be7
        git remote add isilence https://github.com/isilence/linux
        git fetch --no-tags isilence zcrx/large-buffers
        git checkout e129c6bdfceadeaa4f4fe17524ea24f3c3471be7
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/net/ethernet/broadcom/bnxt/