Hi Dmitry, I love your patch! Yet something to improve: [auto build test ERROR on tegra/for-next] [also build test ERROR on clk/clk-next] [cannot apply to robh/for-next tegra-drm/drm/tegra/for-next linus/master v5.7] [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/Dmitry-Osipenko/Introduce-memory... base: https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next config: arm64-randconfig-r012-20200607 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e429cffd4f228f70c1d9df0e5d77c08590dd9766) 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 errors (new ones prefixed by >>, old ones prefixed by <<): aarch64-linux-gnu-ld: drivers/memory/tegra/mc.o: in function `tegra_mc_interconnect_setup': aarch64-linux-gnu-ld: drivers/memory/tegra/mc.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `of_icc_xlate_onecell' which may bind externally can not be used when making a shared object; recompile with -fPIC drivers/memory/tegra/mc.c:657:(.text+0x6c8): dangerous relocation: unsupported relocation aarch64-linux-gnu-ld: drivers/memory/tegra/mc.c:680: undefined reference to `icc_node_create' aarch64-linux-gnu-ld: drivers/memory/tegra/mc.c:686: undefined reference to `icc_node_add' aarch64-linux-gnu-ld: drivers/memory/tegra/mc.c:689: undefined reference to `icc_link_create' vim +657 drivers/memory/tegra/mc.c 611 612 /* 613 * Memory Controller (MC) has few Memory Clients that are issuing memory 614 * bandwidth allocation requests to the MC interconnect provider. The MC 615 * provider aggregates the requests and then sends the aggregated request 616 * up to the External Memory Controller (EMC) interconnect provider which 617 * re-configures hardware interface to External Memory (EMEM) in accordance 618 * to the required bandwidth. Each MC interconnect node represents an 619 * individual Memory Client. 620 * 621 * Memory interconnect topology: 622 * 623 * +----+ 624 * +--------+ | | 625 * | TEXSRD +--->+ | 626 * +--------+ | | 627 * | | +-----+ +------+ 628 * ... | MC +--->+ EMC +--->+ EMEM | 629 * | | +-----+ +------+ 630 * +--------+ | | 631 * | DISP.. +--->+ | 632 * +--------+ | | 633 * +----+ 634 */ 635 static int tegra_mc_interconnect_setup(struct tegra_mc *mc) 636 { 637 struct icc_onecell_data *data; 638 struct icc_node *node; 639 unsigned int num_nodes; 640 unsigned int i; 641 int err; 642 643 /* older device-trees don't have interconnect properties */ 644 if (!of_find_property(mc->dev->of_node, "#interconnect-cells", NULL)) 645 return 0; 646 647 num_nodes = mc->soc->num_clients; 648 649 data = devm_kzalloc(mc->dev, struct_size(data, nodes, num_nodes), 650 GFP_KERNEL); 651 if (!data) 652 return -ENOMEM; 653 654 mc->provider.dev = mc->dev; 655 mc->provider.set = tegra_mc_icc_set; 656 mc->provider.data = data; 658 mc->provider.aggregate = tegra_mc_icc_aggregate; 659 661 if (err) 662 return err; 663 664 /* create Memory Controller node */ 666 err = PTR_ERR_OR_ZERO(node); 667 if (err) 668 goto del_provider; 669 670 node->name = "Memory Controller"; 672 673 /* link Memory Controller to External Memory Controller */ 675 if (err) 676 goto remove_nodes; 677 678 for (i = 0; i < num_nodes; i++) { 679 /* create MC client node */ 680 node = icc_node_create(mc->soc->clients[i].id); 681 err = PTR_ERR_OR_ZERO(node); 682 if (err) 683 goto remove_nodes; 684 685 node->name = mc->soc->clients[i].name; 686 icc_node_add(node, &mc->provider); 687 688 /* link Memory Client to Memory Controller */ 689 err = icc_link_create(node, TEGRA_ICC_MC); 690 if (err) 691 goto remove_nodes; 692 693 data->nodes[i] = node; 694 } 695 data->num_nodes = num_nodes; 696 697 return 0; 698 699 remove_nodes: 701 702 del_provider: 704 705 return err; 706 } 707 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org