Hi Xie, Thank you for the patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on linus/master next-20210818] [cannot apply to iommu/next lwn/docs-next v5.14-rc6] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Xie-Yongji/Introduce-VDUSE-vDPA-... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/0b6102bc9db2d526393eaf9e5b8412940... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xie-Yongji/Introduce-VDUSE-vDPA-Device-in-Userspace/20210818-201209 git checkout 0b6102bc9db2d526393eaf9e5b8412940445a34b # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 698 | .get_vq_num_max = vduse_vdpa_get_vq_num_max, | ^~~~~~~~~~~~~~~~~~~~~~~~~ drivers/vdpa/vdpa_user/vduse_dev.c:698:21: note: (near initialization for 'vduse_vdpa_config_ops.get_vq_num_max') cc1: some warnings being treated as errors vim +698 drivers/vdpa/vdpa_user/vduse_dev.c 684 685 static const struct vdpa_config_ops vduse_vdpa_config_ops = { 686 .set_vq_address = vduse_vdpa_set_vq_address, 687 .kick_vq = vduse_vdpa_kick_vq, 688 .set_vq_cb = vduse_vdpa_set_vq_cb, 689 .set_vq_num = vduse_vdpa_set_vq_num, 690 .set_vq_ready = vduse_vdpa_set_vq_ready, 691 .get_vq_ready = vduse_vdpa_get_vq_ready, 692 .set_vq_state = vduse_vdpa_set_vq_state, 693 .get_vq_state = vduse_vdpa_get_vq_state, 694 .get_vq_align = vduse_vdpa_get_vq_align, 695 .get_features = vduse_vdpa_get_features, 696 .set_features = vduse_vdpa_set_features, 697 .set_config_cb = vduse_vdpa_set_config_cb, 699 .get_device_id = vduse_vdpa_get_device_id, 700 .get_vendor_id = vduse_vdpa_get_vendor_id, 701 .get_status = vduse_vdpa_get_status, 702 .set_status = vduse_vdpa_set_status, 703 .get_config_size = vduse_vdpa_get_config_size, 704 .get_config = vduse_vdpa_get_config, 705 .set_config = vduse_vdpa_set_config, 706 .get_generation = vduse_vdpa_get_generation, 707 .reset = vduse_vdpa_reset, 708 .set_map = vduse_vdpa_set_map, 709 .free = vduse_vdpa_free, 710 }; 711 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org