reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/rgushchin/linux/commit/aff3b6905c9323586157503a143c23c9fc5536b5
        git remote add rgushchin https://github.com/rgushchin/linux.git
        git fetch --no-tags rgushchin memcontrol_v1.rfc
        git checkout aff3b6905c9323586157503a143c23c9fc5536b5
        # 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=i386 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=i386 SHELL=/bin/bash mm/