reproduce (this is a W=1 build):
        # https://github.com/davidhildenbrand/linux/commit/19d9d3ad2c6e040da894b7ce0b8d610ad6d4fe8f
        git remote add davidhildenbrand https://github.com/davidhildenbrand/linux
        git fetch --no-tags davidhildenbrand migration
        git checkout 19d9d3ad2c6e040da894b7ce0b8d610ad6d4fe8f
        # 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/