Re: [PATCH v2 1/3] PCI: Add support for VF Resizable Bar extended cap

Re: [PATCH v2 1/3] PCI: Add support for VF Resizable Bar extended cap

[kernel test robot]

Hi Michał,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/for-linus]
[also build test WARNING on drm-xe/drm-xe-next drm/drm-next drm-exynos/exynos-drm-next drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-misc/drm-misc-next drm-tip/drm-tip linus/master v6.11 next-20240919]
[cannot apply to pci/next]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Micha-Winiarski/PCI-Add-support-for-VF-Resizable-Bar-extended-cap/20240920-064112
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git for-linus
patch link:    https://lore.kernel.org/r/20240919223557.1897608-2-michal.winiarski%40intel.com
patch subject: [PATCH v2 1/3] PCI: Add support for VF Resizable Bar extended cap
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20240920/202409201629.QlC0MRbn-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240920/202409201629.QlC0MRbn-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/202409201629.QlC0MRbn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/pci/pci.c:1920:20: warning: variable 'res' set but not used [-Wunused-but-set-variable]
    1920 |                 struct resource *res;
         |                                  ^
   1 warning generated.


vim +/res +1920 drivers/pci/pci.c

  1903	
  1904	static void pci_restore_vf_rebar_state(struct pci_dev *pdev)
  1905	{
  1906		unsigned int pos, nbars, i;
  1907		u32 ctrl;
  1908	
  1909		if (!pdev->is_physfn)
  1910			return;
  1911	
  1912		pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_VF_REBAR);
  1913		if (!pos)
  1914			return;
  1915	
  1916		pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
  1917		nbars = FIELD_GET(PCI_REBAR_CTRL_NBAR_MASK, ctrl);
  1918	
  1919		for (i = 0; i < nbars; i++, pos += 8) {
> 1920			struct resource *res;
  1921			int bar_idx, size;
  1922	
  1923			pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl);
  1924			bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX;
  1925			res = pdev->resource + bar_idx;
  1926			size = pci_rebar_bytes_to_size(pdev->sriov->barsz[bar_idx]);
  1927			ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE;
  1928			ctrl |= FIELD_PREP(PCI_REBAR_CTRL_BAR_SIZE, size);
  1929			pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl);
  1930		}
  1931	}
  1932	

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