reproduce (this is a W=1 build):
        # https://github.com/l1k/linux/commit/ef118934511b94533def9b11a34018b90d942cc9
        git remote add l1k https://github.com/l1k/linux
        git fetch --no-tags l1k spdm-future
        git checkout ef118934511b94533def9b11a34018b90d942cc9
        # 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 crypto/