Re: [PATCH v4 08/10] vfio-pci/zdev: Add a device feature for error information

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

Hi Farhan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pci/next]
[also build test WARNING on pci/for-linus awilliam-vfio/next s390/features linus/master v6.17-rc7]
[cannot apply to awilliam-vfio/for-linus]
[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/Farhan-Ali/PCI-Avoid-saving-error-values-for-config-space/20250925-012105
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20250924171628.826-9-alifm%40linux.ibm.com
patch subject: [PATCH v4 08/10] vfio-pci/zdev: Add a device feature for error information
config: csky-randconfig-002-20250925 (https://download.01.org/0day-ci/archive/20250925/202509251506.Z5Ov6pYQ-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250925/202509251506.Z5Ov6pYQ-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/202509251506.Z5Ov6pYQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/vfio/pci/vfio_pci_config.c:29:
>> drivers/vfio/pci/vfio_pci_priv.h:106:12: warning: 'vfio_pci_zdev_feature_err' defined but not used [-Wunused-function]
     106 | static int vfio_pci_zdev_feature_err(struct vfio_device *device, u32 flags,
         |            ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/vfio_pci_zdev_feature_err +106 drivers/vfio/pci/vfio_pci_priv.h

   105	
 > 106	static int vfio_pci_zdev_feature_err(struct vfio_device *device, u32 flags,
   107					     void __user *arg, size_t argsz)
   108	{
   109		return -ENODEV;
   110	}
   111	#endif
   112	

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