reproduce (this is a W=1 build):
        # https://github.com/LuBaolu/intel-iommu/commit/97be44a4a870c923a373ab6ab955385daf5e949e
        git remote add lubaolu-intel-iommu https://github.com/LuBaolu/intel-iommu.git
        git fetch --no-tags lubaolu-intel-iommu cca/topics/cca-da-gmem-backend
        git checkout 97be44a4a870c923a373ab6ab955385daf5e949e

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash drivers/vfio/