reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/jlelli/linux/commit/163cb6033def0fff4c9e9fefed7c675ec5a83b08
        git remote add jlelli https://github.com/jlelli/linux.git
        git fetch --no-tags jlelli upstream/dl-server-params
        git checkout 163cb6033def0fff4c9e9fefed7c675ec5a83b08
        # 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 kernel/