[luxis1999-iommufd:iommufd-v5.17-rc1 14/28] ERROR: modpost: "vfio_platform_ops" [drivers/vfio/platform/vfio-amba.ko] undefined!

[kernel test robot]

tree:   https://github.com/luxis1999/iommufd iommufd-v5.17-rc1
head:   ebf68af0385d0d5c209e63e8065d31db938275d8
commit: 92b20d75d7b30d1c70dd13b1be97a7bb00d5910b [14/28] vifo_platform: Use vfio_alloc/put_device()
config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20220210/202202100548.m45ZFnHj-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-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/92b20d75d7b30d1c70dd13b1be97a7bb00d5910b
        git remote add luxis1999-iommufd https://github.com/luxis1999/iommufd
        git fetch --no-tags luxis1999-iommufd iommufd-v5.17-rc1
        git checkout 92b20d75d7b30d1c70dd13b1be97a7bb00d5910b
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash

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

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

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