reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/1d815eeb63e9efc21b0e38b1ba5ab08cfb23bef1
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Joshua-Crofts/iio-frequency-ad9832-remove-kernel-h-proxy-header/20260412-132456
        git checkout 1d815eeb63e9efc21b0e38b1ba5ab08cfb23bef1

        # install powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # clang-23 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-23 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/staging/iio/frequency/