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-21 might not be officially released. Try a lower version if installation fails. git remote add arnd-asm-generic https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git git fetch arnd-asm-generic master git checkout arnd-asm-generic/master b4 shazam https://lore.kernel.org/r/20250620111610.52750-2-cp0613@linux.alibaba.com # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ drivers/net/ethernet/pensando/ionic/