Re: [PATCH 1/1] PCI: Support VF resizable BAR

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

Hi Lianjie,

kernel test robot noticed the following build errors:

[auto build test ERROR on cf87f46fd34d6c19283d9625a7822f20d90b64a4]

url:    https://github.com/intel-lab-lkp/linux/commits/Lianjie-Shi/PCI-Support-VF-resizable-BAR/20240516-173624
base:   cf87f46fd34d6c19283d9625a7822f20d90b64a4
patch link:    https://lore.kernel.org/r/20240516093334.2266599-2-Lianjie.Shi%40amd.com
patch subject: [PATCH 1/1] PCI: Support VF resizable BAR
config: i386-randconfig-014-20240518 (https://download.01.org/0day-ci/archive/20240518/202405180954.pffoQtM9-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240518/202405180954.pffoQtM9-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202405180954.pffoQtM9-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: drivers/pci/pci.o: in function `pci_restore_vf_rebar_state':
>> drivers/pci/pci.c:1895:(.text+0x3bff): undefined reference to `__udivdi3'


vim +1895 drivers/pci/pci.c

  1869	
  1870	static void pci_restore_vf_rebar_state(struct pci_dev *pdev)
  1871	{
  1872	#ifdef CONFIG_PCI_IOV
  1873		unsigned int pos, nbars, i;
  1874		u32 ctrl;
  1875		u16 total;
  1876	
  1877		pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_VF_REBAR);
  1878		if (!pos)
  1879			return;
  1880	
  1881		pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
  1882		nbars = FIELD_GET(PCI_REBAR_CTRL_NBAR_MASK, ctrl);
  1883	
  1884		for (i = 0; i < nbars; i++, pos += 8) {
  1885			struct resource *res;
  1886			int bar_idx, size;
  1887	
  1888			pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
  1889			bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX;
  1890			total = pdev->sriov->total_VFs;
  1891			if (!total)
  1892				return;
  1893	
  1894			res = pdev->resource + bar_idx + PCI_IOV_RESOURCES;
> 1895			size = pci_rebar_bytes_to_size(resource_size(res) / total);
  1896			ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
  1897			ctrl |= FIELD_PREP(PCI_REBAR_CTRL_BAR_SIZE, size);
  1898			pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
  1899		}
  1900	#endif
  1901	}
  1902	

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