[yiliu1765-iommufd:vfio_device_cdev_v5 13/24] drivers/vfio/pci/vfio_pci_core.c:1350:7: warning: variable 'slot' set but not used

[yiliu1765-iommufd:vfio_device_cdev_v5 13/24] drivers/vfio/pci/vfio_pci_core.c:1350:7: warning: variable 'slot' set but not used

[kernel test robot]

tree:   https://github.com/yiliu1765/iommufd.git vfio_device_cdev_v5
head:   bd79c2852f6d7b50c6049240e2b34577255cf2c7
commit: 29c5cd7a057dd29a17a05dba2e2b8e7df76279ad [13/24] vfio/pci: Allow passing zero-length fd array in vfio_pci_hot_reset
config: x86_64-randconfig-a012 (https://download.01.org/0day-ci/archive/20230227/202302270022.cCVzbvMS-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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://github.com/yiliu1765/iommufd/commit/29c5cd7a057dd29a17a05dba2e2b8e7df76279ad
        git remote add yiliu1765-iommufd https://github.com/yiliu1765/iommufd.git
        git fetch --no-tags yiliu1765-iommufd vfio_device_cdev_v5
        git checkout 29c5cd7a057dd29a17a05dba2e2b8e7df76279ad
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/vfio/pci/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302270022.cCVzbvMS-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/vfio/pci/vfio_pci_core.c:1350:7: warning: variable 'slot' set but not used [-Wunused-but-set-variable]
           bool slot = false;
                ^
   1 warning generated.


vim +/slot +1350 drivers/vfio/pci/vfio_pci_core.c

  1343	
  1344	static int vfio_pci_ioctl_pci_hot_reset(struct vfio_pci_core_device *vdev,
  1345						struct vfio_pci_hot_reset __user *arg)
  1346	{
  1347		unsigned long minsz = offsetofend(struct vfio_pci_hot_reset, count);
  1348		struct vfio_pci_hot_reset hdr;
  1349		struct iommufd_ctx *iommufd;
> 1350		bool slot = false;
  1351		int ret;
  1352	
  1353		if (copy_from_user(&hdr, arg, minsz))
  1354			return -EFAULT;
  1355	
  1356		if (hdr.argsz < minsz || hdr.flags)
  1357			return -EINVAL;
  1358	
  1359		/* Can we do a slot or bus reset or neither? */
  1360		if (!pci_probe_reset_slot(vdev->pdev->slot))
  1361			slot = true;
  1362		else if (pci_probe_reset_bus(vdev->pdev->bus))
  1363			return -ENODEV;
  1364	
  1365		if (!hdr.count)
  1366			return vfio_pci_ioctl_pci_hot_reset_groups(vdev, &hdr, arg);
  1367	
  1368		iommufd = vfio_device_iommufd(&vdev->vdev);
  1369		if (!iommufd)
  1370			return -EINVAL;
  1371	
  1372		ret = vfio_pci_dev_set_hot_reset(vdev->vdev.dev_set, NULL, iommufd);
  1373		return ret;
  1374	}
  1375	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests