[PATCH 4/4] PCI: add a REBAR size quirk for Sapphire RX 5600 XT Pulse.

[kernel test robot]

Hi "Christian,

I love your patch! Perhaps something to improve:

[auto build test WARNING on pci/next]
[also build test WARNING on linus/master v5.11-rc2 next-20210104]
[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/Christian-K-nig/pci-export-pci_rebar_get_possible_sizes/20210105-224446
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: arm64-randconfig-r006-20210105 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5c951623bc8965fa1e89660f2f5f4a2944e4981a)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/6838a45fc2394ec88455e1fb3998ac865a077168
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Christian-K-nig/pci-export-pci_rebar_get_possible_sizes/20210105-224446
        git checkout 6838a45fc2394ec88455e1fb3998ac865a077168
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/pci/pci.c:3611:7: warning: equality comparison result unused [-Wunused-comparison]
                   cap == 0x7f00;
                   ~~~~^~~~~~~~~
   drivers/pci/pci.c:3611:7: note: use '=' to turn this equality comparison into an assignment
                   cap == 0x7f00;
                       ^~
                       =
   1 warning generated.


vim +3611 drivers/pci/pci.c

  3587	
  3588	/**
  3589	 * pci_rebar_get_possible_sizes - get possible sizes for BAR
  3590	 * @pdev: PCI device
  3591	 * @bar: BAR to query
  3592	 *
  3593	 * Get the possible sizes of a resizable BAR as bitmask defined in the spec
  3594	 * (bit 0=1MB, bit 19=512GB). Returns 0 if BAR isn't resizable.
  3595	 */
  3596	u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
  3597	{
  3598		int pos;
  3599		u32 cap;
  3600	
  3601		pos = pci_rebar_find_pos(pdev, bar);
  3602		if (pos < 0)
  3603			return 0;
  3604	
  3605		pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap);
  3606		cap = (cap & PCI_REBAR_CAP_SIZES) >> 4;
  3607	
  3608		/* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */
  3609		if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f &&
  3610		    bar == 0 && cap == 0x700)
> 3611			cap == 0x7f00;
  3612	
  3613		return cap;
  3614	}
  3615	EXPORT_SYMBOL(pci_rebar_get_possible_sizes);
  3616	

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