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/ambarus/linux-0day/commit/7ae3e681354fe887656fe3bc659c697b4e27006a
        git remote add ambarus https://github.com/ambarus/linux-0day
        git fetch --no-tags ambarus v6.12-rc3-acpm-v2
        git checkout 7ae3e681354fe887656fe3bc659c697b4e27006a
        # 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=mips olddefconfig
        ~/lkp-tests/kbuild/make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=mips SHELL=/bin/bash drivers/firmware/samsung/