Hi "Saheed, [FYI, it's a private test report for your RFC patch.] [auto build test ERROR on helgaas-pci/next] [also build test ERROR on v5.15 next-20211106] [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/Saheed-O-Bolarinwa/Remove-unnces... base: https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next config: powerpc-allyesconfig (attached as .config) compiler: powerpc-linux-gcc (GCC) 11.2.0 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 # https://github.com/0day-ci/linux/commit/d60048f94473e70fdbbe82d7e4c3df8ab... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Saheed-O-Bolarinwa/Remove-unncessary-linked-list-from-aspm-c/20211107-015558 git checkout d60048f94473e70fdbbe82d7e4c3df8ab7431416 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-review/Saheed-O-Bolarinwa/Remove-unncessary-linked-list-from-aspm-c/20211107-015558 HEAD 1363f09cfe46f62adad834d4ea2eb67fb29ab60a builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): drivers/pci/pcie/aspm.c: In function 'alloc_pcie_link_state': 886 | link->root = ulink_bridge->root; | ^~~~~~~~~~~~ | uplink_bridge drivers/pci/pcie/aspm.c:886:30: note: each undeclared identifier is reported only once for each function it appears in vim +886 drivers/pci/pcie/aspm.c 853 854 static struct pcie_link_state *alloc_pcie_link_state(struct pci_dev *pdev) 855 { 856 struct pcie_link_state *link; 857 858 link = kzalloc(sizeof(*link), GFP_KERNEL); 859 if (!link) 860 return NULL; 861 862 INIT_LIST_HEAD(&link->sibling); 863 link->pdev = pdev; 864 link->downstream = pci_function_0(pdev->subordinate); 865 866 /* 867 * Root Ports and PCI/PCI-X to PCIe Bridges are roots of PCIe 868 * hierarchies. Note that some PCIe host implementations omit 869 * the root ports entirely, in which case a downstream port on 870 * a switch may become the root of the link state chain for all 871 * its subordinate endpoints. 872 */ 873 if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT || 874 pci_pcie_type(pdev) == PCI_EXP_TYPE_PCIE_BRIDGE || 875 !pdev->bus->parent->self) { 876 link->root = link; 877 } else { 878 struct pcie_link_state *uplink_bridge; 879 880 uplink_bridge = pcie_upstream_link(pdev); 881 if (!uplink_bridge) { 882 kfree(link); 883 return NULL; 884 } 885 887 } 888 889 list_add(&link->sibling, &link_list); 890 pdev->link_state = link; 891 return link; 892 } 893 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org