reproduce:
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/intel-lab-lkp/linux/commit/cefc2232dba5db41bf3c25382c6dae03c8f71458
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Cristian-Ciocaltea/drm-bridge-synopsys-Add-DW-HDMI-QP-TX-Controller-support-library/20240906-092027
        git checkout cefc2232dba5db41bf3c25382c6dae03c8f71458
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        ~/lkp-tests/kbuild/make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=powerpc olddefconfig
        ~/lkp-tests/kbuild/make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/bridge/synopsys/