reproduce (this is a W=1 build):
        # https://github.com/jimc/linux/commit/cfa6f73e601bea4f41eb0a637c9baa23eefd545e
        git remote add jimc https://github.com/jimc/linux.git
        git fetch --no-tags jimc dd-shrink-go
        git checkout cfa6f73e601bea4f41eb0a637c9baa23eefd545e

        # 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 drivers/iommu/intel/ lib/