reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64le-linux-gnu
        # clang-21 might not be officially released. Try a lower version if installation fails.
        git remote add staging https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
        git fetch staging staging-testing
        git checkout staging/staging-testing
        b4 shazam https://lore.kernel.org/r/fad83a7efb12c0f40dc2660cf9dd4c57422ecff9.1745007964.git.gshahrouzi@gmail.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 drivers/staging/iio/adc/