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/5d5ac3a9931f82e82bd3abe0cab6c686e1090d67
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review WeiHao-Li/phy-rockchip-inno-usb2-Add-usb2-phy-support-for-RK3368/20250905-205804
        git checkout 5d5ac3a9931f82e82bd3abe0cab6c686e1090d67
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__ -fmax-errors=unlimited -fmax-warnings=unlimited' O=build_dir ARCH=arc SHELL=/bin/bash drivers/phy/rockchip/