reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/bristot/linux.git/commit/?id=46a04dc08aec247d43247d411da82c4c78d048c5
        git remote add bristot git://git.kernel.org/pub/scm/linux/kernel/git/bristot/linux
        git fetch --no-tags bristot dl_server_v6
        git checkout 46a04dc08aec247d43247d411da82c4c78d048c5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=x86_64 SHELL=/bin/bash