Hi Thomas, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on next-20200813] [cannot apply to drm-intel/for-linux-next linux-arm/drm-armada-devel linux-arm/drm-armada-fixes 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: arc-allmodconfig (attached as .config) compiler: arc-elf-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 >>): drivers/gpu/drm/arm/malidp_planes.c: In function 'malidp_check_pages_threshold': 349 | sgt = obj->dev->driver->gem_prime_get_sg_table(obj); | ^~~~~~~~~~~~~~~~~~~~~~ | gem_prime_import_sg_table vim +349 drivers/gpu/drm/arm/malidp_planes.c 1f23a56a46b81d Jamie Fox 2018-10-01 325 1f23a56a46b81d Jamie Fox 2018-10-01 326 /* 1f23a56a46b81d Jamie Fox 2018-10-01 327 * Check if the framebuffer is entirely made up of pages at least pgsize in 1f23a56a46b81d Jamie Fox 2018-10-01 328 * size. Only a heuristic: assumes that each scatterlist entry has been aligned 1f23a56a46b81d Jamie Fox 2018-10-01 329 * to the largest page size smaller than its length and that the MMU maps to 1f23a56a46b81d Jamie Fox 2018-10-01 330 * the largest page size possible. 1f23a56a46b81d Jamie Fox 2018-10-01 331 */ 1f23a56a46b81d Jamie Fox 2018-10-01 332 static bool malidp_check_pages_threshold(struct malidp_plane_state *ms, 1f23a56a46b81d Jamie Fox 2018-10-01 333 u32 pgsize) 1f23a56a46b81d Jamie Fox 2018-10-01 334 { 1f23a56a46b81d Jamie Fox 2018-10-01 335 int i; 1f23a56a46b81d Jamie Fox 2018-10-01 336 1f23a56a46b81d Jamie Fox 2018-10-01 337 for (i = 0; i < ms->n_planes; i++) { 1f23a56a46b81d Jamie Fox 2018-10-01 338 struct drm_gem_object *obj; 1f23a56a46b81d Jamie Fox 2018-10-01 339 struct drm_gem_cma_object *cma_obj; 1f23a56a46b81d Jamie Fox 2018-10-01 340 struct sg_table *sgt; 1f23a56a46b81d Jamie Fox 2018-10-01 341 struct scatterlist *sgl; 1f23a56a46b81d Jamie Fox 2018-10-01 342 1f23a56a46b81d Jamie Fox 2018-10-01 343 obj = drm_gem_fb_get_obj(ms->base.fb, i); 1f23a56a46b81d Jamie Fox 2018-10-01 344 cma_obj = to_drm_gem_cma_obj(obj); 1f23a56a46b81d Jamie Fox 2018-10-01 345 1f23a56a46b81d Jamie Fox 2018-10-01 346 if (cma_obj->sgt) 1f23a56a46b81d Jamie Fox 2018-10-01 347 sgt = cma_obj->sgt; 1f23a56a46b81d Jamie Fox 2018-10-01 348 else 1f23a56a46b81d Jamie Fox 2018-10-01 @349 sgt = obj->dev->driver->gem_prime_get_sg_table(obj); 1f23a56a46b81d Jamie Fox 2018-10-01 350 1f23a56a46b81d Jamie Fox 2018-10-01 351 if (!sgt) 1f23a56a46b81d Jamie Fox 2018-10-01 352 return false; 1f23a56a46b81d Jamie Fox 2018-10-01 353 1f23a56a46b81d Jamie Fox 2018-10-01 354 sgl = sgt->sgl; 1f23a56a46b81d Jamie Fox 2018-10-01 355 1f23a56a46b81d Jamie Fox 2018-10-01 356 while (sgl) { 1f23a56a46b81d Jamie Fox 2018-10-01 357 if (sgl->length < pgsize) { 1f23a56a46b81d Jamie Fox 2018-10-01 358 if (!cma_obj->sgt) 1f23a56a46b81d Jamie Fox 2018-10-01 359 kfree(sgt); 1f23a56a46b81d Jamie Fox 2018-10-01 360 return false; 1f23a56a46b81d Jamie Fox 2018-10-01 361 } 1f23a56a46b81d Jamie Fox 2018-10-01 362 1f23a56a46b81d Jamie Fox 2018-10-01 363 sgl = sg_next(sgl); 1f23a56a46b81d Jamie Fox 2018-10-01 364 } 1f23a56a46b81d Jamie Fox 2018-10-01 365 if (!cma_obj->sgt) 1f23a56a46b81d Jamie Fox 2018-10-01 366 kfree(sgt); 1f23a56a46b81d Jamie Fox 2018-10-01 367 } 1f23a56a46b81d Jamie Fox 2018-10-01 368 1f23a56a46b81d Jamie Fox 2018-10-01 369 return true; 1f23a56a46b81d Jamie Fox 2018-10-01 370 } 1f23a56a46b81d Jamie Fox 2018-10-01 371 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org