reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-66-g0196afe1
        # https://github.com/intel-lab-lkp/linux/commit/94d8f5c58f361d5cabacbf5a33186b518c65b290
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Damien-Le-Moal/PCI-endpoint-Introduce-pci_epc_function_is_valid/20241004-130947
        git checkout 94d8f5c58f361d5cabacbf5a33186b518c65b290
        # 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 drivers/pci/endpoint/