tree:   https://github.com/luxis1999/iommufd iommufd-v5.16-rc2
head:   9821bacf94cee7dd38c9f919a0a38fd48a6f3ae7
commit: 06d2ba7660dd55a192ac5893a04fe30674236d2d [24/31] vifo_platform: Use vfio_alloc/put_device()
config: arc-buildonly-randconfig-r001-20211125 (https://download.01.org/0day-ci/archive/20211126/202111262210.xve6f7hZ-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/luxis1999/iommufd/commit/06d2ba7660dd55a192ac5893a04fe30674236d2d
        git remote add luxis1999-iommufd https://github.com/luxis1999/iommufd
        git fetch --no-tags luxis1999-iommufd iommufd-v5.16-rc2
        git checkout 06d2ba7660dd55a192ac5893a04fe30674236d2d
        # save the config file to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "vfio_platform_ops" [drivers/vfio/platform/vfio-platform.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org