reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git/commit/?id=77c33c80f878010b8cf3f8c931c3b6e46397dc34
        git remote add vireshk https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git
        git fetch --no-tags vireshk rust/cpufreq-dt
        git checkout 77c33c80f878010b8cf3f8c931c3b6e46397dc34
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 prepare