reproduce (this is a W=1 build):
        # https://github.com/norov/linux/commit/7d76a9d1f1fd2047ddb095a1c698bd6b557d63b6
        git remote add norov https://github.com/norov/linux
        git fetch --no-tags norov fnb
        git checkout 7d76a9d1f1fd2047ddb095a1c698bd6b557d63b6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/