Hi Thomas,

I love your patch! Yet something to improve:

[auto build test ERROR on next-20200519]
[cannot apply to sunxi/sunxi/for-next joel-aspeed/for-next shawnguo/for-next stm32/stm32-next linus/master pinchartl-media/drm/du/next v5.7-rc6 v5.7-rc5 v5.7-rc4 v5.7-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Thomas-Zimmermann/drm-Convert-most-CMA-based-drivers-to-GEM-object-functions/20200522-215754
base:    fb57b1fabcb28f358901b2df90abd2b48abc1ca8
config: arm64-randconfig-r032-20200524 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

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

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

>> drivers/gpu/drm/zte/zx_drm_drv.c:39:2: error: use of undeclared identifier 'DRM_GEM_CMA_VMAP_DRIVER_OPS'
DRM_GEM_CMA_VMAP_DRIVER_OPS,
^
1 error generated.

vim +/DRM_GEM_CMA_VMAP_DRIVER_OPS +39 drivers/gpu/drm/zte/zx_drm_drv.c

    36	
    37	static struct drm_driver zx_drm_driver = {
    38		.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  > 39		DRM_GEM_CMA_VMAP_DRIVER_OPS,
    40		.fops = &zx_drm_fops,
    41		.name = "zx-vou",
    42		.desc = "ZTE VOU Controller DRM",
    43		.date = "20160811",
    44		.major = 1,
    45		.minor = 0,
    46	};
    47	

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