[arnd-playground:randconfig-v5.12 397/597] arch/powerpc/kernel/pci-common.c:1440:35: warning: 'b' is used uninitialized in this function

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git randconfig-v5.12
head:   fd21c2581b744639b5207c11651ab40abf13701a
commit: 130e1a398709fc631f3438fa57c450a4b392603e [397/597] pci: move PCI_PROBE_ONLY flag into host_bridge
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc64-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/commit/?id=130e1a398709fc631f3438fa57c450a4b392603e
        git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground randconfig-v5.12
        git checkout 130e1a398709fc631f3438fa57c450a4b392603e
        # 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@intel.com>

All warnings (new ones prefixed by >>):

   arch/powerpc/kernel/pci-common.c: In function 'pcibios_resource_survey':
>> arch/powerpc/kernel/pci-common.c:1440:35: warning: 'b' is used uninitialized in this function [-Wuninitialized]
    1440 |  struct pci_host_bridge *bridge = pci_find_host_bridge(b);
         |                                   ^~~~~~~~~~~~~~~~~~~~~~~


vim +/b +1440 arch/powerpc/kernel/pci-common.c

  1436	
  1437	void __init pcibios_resource_survey(void)
  1438	{
  1439		struct pci_bus *b;
> 1440		struct pci_host_bridge *bridge = pci_find_host_bridge(b);
  1441	
  1442		/* Allocate and assign resources */
  1443		list_for_each_entry(b, &pci_root_buses, node)
  1444			pcibios_allocate_bus_resources(b);
  1445		if (!pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
  1446			pcibios_allocate_resources(0);
  1447			pcibios_allocate_resources(1);
  1448		}
  1449	
  1450		/* Before we start assigning unassigned resource, we try to reserve
  1451		 * the low IO area and the VGA memory area if they intersect the
  1452		 * bus available resources to avoid allocating things on top of them
  1453		 */
  1454		if (!bridge->probe_only) {
  1455			list_for_each_entry(b, &pci_root_buses, node)
  1456				pcibios_reserve_legacy_regions(b);
  1457		}
  1458	
  1459		/* Now, if the platform didn't decide to blindly trust the firmware,
  1460		 * we proceed to assigning things that were left unassigned
  1461		 */
  1462		if (!bridge->probe_only) {
  1463			pr_debug("PCI: Assigning unassigned resources...\n");
  1464			pci_assign_unassigned_resources();
  1465		}
  1466	}
  1467	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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