reproduce (this is a W=1 build):
        # https://github.com/davidhildenbrand/linux/commit/d80a4597b25823d1bcf9d253452fcbcbef4d5c68
        git remote add davidhildenbrand https://github.com/davidhildenbrand/linux
        git fetch --no-tags davidhildenbrand folio_walk
        git checkout d80a4597b25823d1bcf9d253452fcbcbef4d5c68
        # 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 mm/