tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-4.14 head: a567298cc2a7571c3a7c390cadcac9e1d54ca2d1 commit: 084247b52ffab163538f311e4e2d680da4968b8c [77/84] efi/arm: Defer probe of PCIe backed efifb on DT systems config: arm64-defconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 7.5.0 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 git checkout 084247b52ffab163538f311e4e2d680da4968b8c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 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 >>): drivers/firmware/efi/arm-init.c: In function 'efifb_add_links': sup_dev = get_dev_from_fwnode(&sup_np->fwnode); ^~~~~~~~~~~~~~~~~~~ set_primary_fwnode sup_dev = get_dev_from_fwnode(&sup_np->fwnode); ^ drivers/firmware/efi/arm-init.c: At top level: .add_links = efifb_add_links, ^~~~~~~~~ .add_links = efifb_add_links, ^~~~~~~~~~~~~~~ drivers/firmware/efi/arm-init.c:356:15: note: (near initialization for 'efifb_fwnode_ops.get') cc1: some warnings being treated as errors vim +331 drivers/firmware/efi/arm-init.c 308 309 /* 310 * If the efifb framebuffer is backed by a PCI graphics controller, we have 311 * to ensure that this relation is expressed using a device link when 312 * running in DT mode, or the probe order may be reversed, resulting in a 313 * resource reservation conflict on the memory window that the efifb 314 * framebuffer steals from the PCIe host bridge. 315 */ 316 static int efifb_add_links(const struct fwnode_handle *fwnode, 317 struct device *dev) 318 { 319 struct device_node *sup_np; 320 struct device *sup_dev; 321 322 sup_np = find_pci_overlap_node(); 323 324 /* 325 * If there's no PCI graphics controller backing the efifb, we are 326 * done here. 327 */ 328 if (!sup_np) 329 return 0; 330 332 of_node_put(sup_np); 333 334 /* 335 * Return -ENODEV if the PCI graphics controller device hasn't been 336 * registered yet. This ensures that efifb isn't allowed to probe 337 * and this function is retried again when new devices are 338 * registered. 339 */ 340 if (!sup_dev) 341 return -ENODEV; 342 343 /* 344 * If this fails, retrying this function at a later point won't 345 * change anything. So, don't return an error after this. 346 */ 347 if (!device_link_add(dev, sup_dev, 0)) 348 dev_warn(dev, "device_link_add() failed\n"); 349 350 put_device(sup_dev); 351 352 return 0; 353 } 354 355 static const struct fwnode_operations efifb_fwnode_ops = { 357 }; 358 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org