Hi Thomas, I love your patch! Yet something to improve: [auto build test ERROR on next-20200915] [cannot apply to drm-intel/for-linux-next arm/drm-armada-devel linus/master arm/drm-armada-fixes anholt/for-next v5.9-rc5 v5.9-rc4 v5.9-rc3 v5.9-rc5] [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/Thomas-Zimmermann/Convert-all-re... base: 6b02addb1d1748d21dd1261e46029b264be4e5a0 config: arm64-randconfig-r015-20200916 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9e3842d60351f986d77dfe0a94f76e4fd895f188) 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: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): .gem_free_object_unlocked = drm_gem_cma_free_object, ^ .gem_vm_ops = &drm_gem_cma_vm_ops, ^ .gem_prime_export = drm_gem_prime_export, ^~~~~~~~~~~~~~~~ gem_prime_import include/drm/drm_drv.h:370:28: note: 'gem_prime_import' declared here struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev, ^ .gem_prime_export = drm_gem_prime_export, ^~~~~~~~~~~~~~~~~~~~ .gem_prime_export = drm_gem_prime_export, ^~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:37:22: note: previous initialization is here .gem_prime_import = drm_gem_prime_import, ^~~~~~~~~~~~~~~~~~~~ .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, ^~~~~~~~~~~~~~~~~~~~~~ gem_prime_import_sg_table include/drm/drm_drv.h:378:27: note: 'gem_prime_import_sg_table' declared here struct drm_gem_object *(*gem_prime_import_sg_table)( ^ .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:40:31: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides] .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:39:28: note: previous initialization is here .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .gem_prime_vmap = drm_gem_cma_prime_vmap, ^~~~~~~~~~~~~~ gem_prime_mmap include/drm/drm_drv.h:391:8: note: 'gem_prime_mmap' declared here int (*gem_prime_mmap)(struct drm_gem_object *obj, ^ .gem_prime_vmap = drm_gem_cma_prime_vmap, ^~~~~~~~~~~~~~~~~~~~~~ .gem_prime_vunmap = drm_gem_cma_prime_vunmap, ^~~~~~~~~~~~~~~~ gem_prime_mmap include/drm/drm_drv.h:391:8: note: 'gem_prime_mmap' declared here int (*gem_prime_mmap)(struct drm_gem_object *obj, ^ drivers/gpu/drm/imx/dcss/dcss-kms.c:42:22: error: incompatible function pointer types initializing 'int (*)(struct drm_gem_object *, struct vm_area_struct *)' with an expression of type 'void (struct drm_gem_object *, void *)' [-Werror,-Wincompatible-function-pointer-types] .gem_prime_vunmap = drm_gem_cma_prime_vunmap, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:42:22: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides] .gem_prime_vunmap = drm_gem_cma_prime_vunmap, ^~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:41:21: note: previous initialization is here .gem_prime_vmap = drm_gem_cma_prime_vmap, ^~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:43:21: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides] .gem_prime_mmap = drm_gem_cma_prime_mmap, ^~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/imx/dcss/dcss-kms.c:42:22: note: previous initialization is here .gem_prime_vunmap = drm_gem_cma_prime_vunmap, ^~~~~~~~~~~~~~~~~~~~~~~~ 4 warnings and 10 errors generated. # https://github.com/0day-ci/linux/commit/84300c9d089d60d5dc528a7bd6e287009... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Thomas-Zimmermann/Convert-all-remaining-drivers-to-GEM-object-functions/20200915-230157 git checkout 84300c9d089d60d5dc528a7bd6e2870090201f0e vim +31 drivers/gpu/drm/imx/dcss/dcss-kms.c 9021c317b77024f Laurentiu Palcu 2020-07-31 28 9021c317b77024f Laurentiu Palcu 2020-07-31 29 static struct drm_driver dcss_kms_driver = { 9021c317b77024f Laurentiu Palcu 2020-07-31 30 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 9021c317b77024f Laurentiu Palcu 2020-07-31 @31 .gem_free_object_unlocked = drm_gem_cma_free_object, 9021c317b77024f Laurentiu Palcu 2020-07-31 @32 .gem_vm_ops = &drm_gem_cma_vm_ops, 9021c317b77024f Laurentiu Palcu 2020-07-31 33 .dumb_create = drm_gem_cma_dumb_create, 9021c317b77024f Laurentiu Palcu 2020-07-31 34 9021c317b77024f Laurentiu Palcu 2020-07-31 35 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 9021c317b77024f Laurentiu Palcu 2020-07-31 36 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 9021c317b77024f Laurentiu Palcu 2020-07-31 37 .gem_prime_import = drm_gem_prime_import, 9021c317b77024f Laurentiu Palcu 2020-07-31 @38 .gem_prime_export = drm_gem_prime_export, 9021c317b77024f Laurentiu Palcu 2020-07-31 @39 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 9021c317b77024f Laurentiu Palcu 2020-07-31 40 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 9021c317b77024f Laurentiu Palcu 2020-07-31 @41 .gem_prime_vmap = drm_gem_cma_prime_vmap, 9021c317b77024f Laurentiu Palcu 2020-07-31 @42 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 9021c317b77024f Laurentiu Palcu 2020-07-31 43 .gem_prime_mmap = drm_gem_cma_prime_mmap, 9021c317b77024f Laurentiu Palcu 2020-07-31 44 .fops = &dcss_cma_fops, 9021c317b77024f Laurentiu Palcu 2020-07-31 45 .name = "imx-dcss", 9021c317b77024f Laurentiu Palcu 2020-07-31 46 .desc = "i.MX8MQ Display Subsystem", 9021c317b77024f Laurentiu Palcu 2020-07-31 47 .date = "20190917", 9021c317b77024f Laurentiu Palcu 2020-07-31 48 .major = 1, 9021c317b77024f Laurentiu Palcu 2020-07-31 49 .minor = 0, 9021c317b77024f Laurentiu Palcu 2020-07-31 50 .patchlevel = 0, 9021c317b77024f Laurentiu Palcu 2020-07-31 51 }; 9021c317b77024f Laurentiu Palcu 2020-07-31 52 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org