reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/70e38aef8fc8b80bc60e2249e5f2a38c2d1e604b
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhan-Xusheng/vdso-math64-Add-and-use-__iter_div64_u64_rem/20260901-100634
        git checkout 70e38aef8fc8b80bc60e2249e5f2a38c2d1e604b

        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=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-16.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=powerpc prepare