reproduce (this is a W=1 build):
        # https://github.com/alexshi/linux/commit/80997c8b66fd8d73a96cd681a473bacaf75b7d98
        git remote add alexshi https://github.com/alexshi/linux.git
        git fetch --no-tags alexshi master
        git checkout 80997c8b66fd8d73a96cd681a473bacaf75b7d98
        # 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 SHELL=/bin/bash arch/x86/kernel/