reproduce (this is a W=1 build):
        git checkout 6ba59ff4227927d3a8530fc2973b80e94b54d58f
        b4 shazam https://lore.kernel.org/r/20240618-exclusive-gup-v1-2-30472a19c5d1@quicinc.com
        # 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/