reproduce (this is a W=1 build):
        # https://github.com/davidhildenbrand/linux/commit/77eea7c11c7ddc881412df294d15467ed7cb57e6
        git remote add davidhildenbrand https://github.com/davidhildenbrand/linux
        git fetch --no-tags davidhildenbrand folio_walk
        git checkout 77eea7c11c7ddc881412df294d15467ed7cb57e6
        # 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 mm/