tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git pci-probe-rework-20210320 head: 0f62dd81d92215e38f654f21e515888fbb2b580c commit: bd7acd0ea1bf0582ac58af1d1dc87c8cda0c7de1 [21/24] powerpc: rework PCI host allocation config: powerpc-mpc834x_itxgp_defconfig (attached as .config) compiler: powerpc-linux-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 # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground pci-probe-rework-20210320 git checkout bd7acd0ea1bf0582ac58af1d1dc87c8cda0c7de1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +1667 arch/powerpc/kernel/pci-common.c 98d9f30c820d50 Benjamin Herrenschmidt 2011-04-11 1661 0ed2c722c65051 Grant Likely 2009-08-28 1662 /** bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1663 * pci_scan_host_bridge - Given a pci_controller, setup and scan the PCI bus bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1664 * @bridge: Pointer to the PCI host controller instance structure 0ed2c722c65051 Grant Likely 2009-08-28 1665 */ bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1666 void pcibios_scan_host_bridge(struct pci_host_bridge *bridge) 0ed2c722c65051 Grant Likely 2009-08-28 @1667 { bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1668 struct pci_controller *hose = pci_host_bridge_priv(bridge); 0ed2c722c65051 Grant Likely 2009-08-28 1669 struct device_node *node = hose->dn; 0ed2c722c65051 Grant Likely 2009-08-28 1670 int mode; 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1671 int error; 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1672 b7c670d673d118 Rob Herring 2017-08-21 1673 pr_debug("PCI: Scanning PHB %pOF\n", node); 0ed2c722c65051 Grant Likely 2009-08-28 1674 45a709f890a7b8 Bjorn Helgaas 2011-10-28 1675 /* Get some IO space for the new PHB */ 45a709f890a7b8 Bjorn Helgaas 2011-10-28 1676 pcibios_setup_phb_io_space(hose); 45a709f890a7b8 Bjorn Helgaas 2011-10-28 1677 45a709f890a7b8 Bjorn Helgaas 2011-10-28 1678 /* Wire up PHB bus resources */ bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1679 pcibios_setup_phb_resources(hose); 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1680 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1681 bridge->sysdata = hose; 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1682 bridge->busnr = hose->first_busno; bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1683 bridge->custom_bus_scan = 1; 45a709f890a7b8 Bjorn Helgaas 2011-10-28 1684 be8e60d8bed118 Yinghai Lu 2012-05-17 1685 hose->busn.start = hose->first_busno; be8e60d8bed118 Yinghai Lu 2012-05-17 1686 hose->busn.end = hose->last_busno; be8e60d8bed118 Yinghai Lu 2012-05-17 1687 hose->busn.flags = IORESOURCE_BUS; 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1688 pci_add_resource(&bridge->windows, &hose->busn); be8e60d8bed118 Yinghai Lu 2012-05-17 1689 bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1690 mode = PCI_PROBE_NORMAL; bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1691 if (node && hose->controller_ops.probe_mode) bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1692 mode = hose->controller_ops.probe_mode(bridge->bus); bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1693 /* Get probe mode and perform scan */ bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1694 pr_debug(" probe mode: %d\n", mode); bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1695 if (mode == PCI_PROBE_DEVTREE) bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1696 bridge->custom_bus_scan = 1; bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1697 0ed2c722c65051 Grant Likely 2009-08-28 1698 /* Create an empty bus for the toplevel */ bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1699 error = pci_scan_root_bus_bridge(bridge); 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1700 if (error) { 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1701 pr_err("Failed to create bus for PCI domain %04x: %d\n", 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1702 hose->global_number, error); 6905e0abbe6f56 Arnd Bergmann 2020-12-18 1703 pci_free_host_bridge(bridge); 0ed2c722c65051 Grant Likely 2009-08-28 1704 return; 0ed2c722c65051 Grant Likely 2009-08-28 1705 } 0ed2c722c65051 Grant Likely 2009-08-28 1706 be8e60d8bed118 Yinghai Lu 2012-05-17 1707 if (mode == PCI_PROBE_DEVTREE) bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1708 of_scan_bus(node, bridge->bus); 781fb7a3e4cdca Benjamin Herrenschmidt 2011-09-19 1709 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1710 /* Platform gets a chance to do some global fixups before 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1711 * we proceed to resource allocation 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1712 */ 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1713 if (ppc_md.pcibios_fixup_phb) 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1714 ppc_md.pcibios_fixup_phb(hose); 491b98c315dbe3 Benjamin Herrenschmidt 2011-11-06 1715 781fb7a3e4cdca Benjamin Herrenschmidt 2011-09-19 1716 /* Configure PCI Express settings */ bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1717 if (bridge->bus && !pci_has_flag(PCI_PROBE_ONLY)) { 781fb7a3e4cdca Benjamin Herrenschmidt 2011-09-19 1718 struct pci_bus *child; bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1719 list_for_each_entry(child, &bridge->bus->children, node) a58674ff8383f5 Bjorn Helgaas 2013-08-22 1720 pcie_bus_configure_settings(child); 781fb7a3e4cdca Benjamin Herrenschmidt 2011-09-19 1721 } 0ed2c722c65051 Grant Likely 2009-08-28 1722 } bd7acd0ea1bf05 Arnd Bergmann 2020-12-19 1723 EXPORT_SYMBOL_GPL(pcibios_scan_host_bridge); c065488f1acfc0 Kumar Gala 2011-05-19 1724 :::::: The code at line 1667 was first introduced by commit :::::: 0ed2c722c650513ba4bce868c7a052e576c060e2 powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan() :::::: TO: Grant Likely <grant.likely(a)secretlab.ca&gt; :::::: CC: Benjamin Herrenschmidt <benh(a)kernel.crashing.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org