Hi Thomas, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on next-20200813] [cannot apply to drm-intel/for-linux-next linux-arm/drm-armada-devel linux-arm/drm-armada-fixes anholt/for-next v5.8] [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: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dc06fe51d26efc100ac74121607c01a454867c91 config: i386-randconfig-m021-20200811 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; New smatch warnings: drivers/gpu/drm/drm_prime.c:389 export_and_register_object() error: uninitialized symbol 'dmabuf'. Old smatch warnings: drivers/gpu/drm/drm_prime.c:359 drm_gem_prime_fd_to_handle() warn: inconsistent returns 'dev->object_name_lock'. vim +/dmabuf +389 drivers/gpu/drm/drm_prime.c 89177644a7b6306 Aaron Plattner 2013-01-15 374 319c933c71f3dbd Daniel Vetter 2013-08-15 375 static struct dma_buf *export_and_register_object(struct drm_device *dev, 319c933c71f3dbd Daniel Vetter 2013-08-15 376 struct drm_gem_object *obj, 319c933c71f3dbd Daniel Vetter 2013-08-15 377 uint32_t flags) 319c933c71f3dbd Daniel Vetter 2013-08-15 378 { 319c933c71f3dbd Daniel Vetter 2013-08-15 379 struct dma_buf *dmabuf; 319c933c71f3dbd Daniel Vetter 2013-08-15 380 319c933c71f3dbd Daniel Vetter 2013-08-15 381 /* prevent races with concurrent gem_close. */ 319c933c71f3dbd Daniel Vetter 2013-08-15 382 if (obj->handle_count == 0) { 319c933c71f3dbd Daniel Vetter 2013-08-15 383 dmabuf = ERR_PTR(-ENOENT); 319c933c71f3dbd Daniel Vetter 2013-08-15 384 return dmabuf; 319c933c71f3dbd Daniel Vetter 2013-08-15 385 } 319c933c71f3dbd Daniel Vetter 2013-08-15 386 b39b5394fabc79a Noralf Trønnes 2018-11-10 387 if (obj->funcs && obj->funcs->export) b39b5394fabc79a Noralf Trønnes 2018-11-10 388 dmabuf = obj->funcs->export(obj, flags); 319c933c71f3dbd Daniel Vetter 2013-08-15 @389 if (IS_ERR(dmabuf)) { 319c933c71f3dbd Daniel Vetter 2013-08-15 390 /* normally the created dma-buf takes ownership of the ref, 319c933c71f3dbd Daniel Vetter 2013-08-15 391 * but if that fails then drop the ref 319c933c71f3dbd Daniel Vetter 2013-08-15 392 */ 319c933c71f3dbd Daniel Vetter 2013-08-15 393 return dmabuf; 319c933c71f3dbd Daniel Vetter 2013-08-15 394 } 319c933c71f3dbd Daniel Vetter 2013-08-15 395 319c933c71f3dbd Daniel Vetter 2013-08-15 396 /* 319c933c71f3dbd Daniel Vetter 2013-08-15 397 * Note that callers do not need to clean up the export cache 319c933c71f3dbd Daniel Vetter 2013-08-15 398 * since the check for obj->handle_count guarantees that someone 319c933c71f3dbd Daniel Vetter 2013-08-15 399 * will clean it up. 319c933c71f3dbd Daniel Vetter 2013-08-15 400 */ 319c933c71f3dbd Daniel Vetter 2013-08-15 401 obj->dma_buf = dmabuf; 319c933c71f3dbd Daniel Vetter 2013-08-15 402 get_dma_buf(obj->dma_buf); 319c933c71f3dbd Daniel Vetter 2013-08-15 403 319c933c71f3dbd Daniel Vetter 2013-08-15 404 return dmabuf; 319c933c71f3dbd Daniel Vetter 2013-08-15 405 } 319c933c71f3dbd Daniel Vetter 2013-08-15 406 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org