[frank-w-bpi-r2-4.14:5.14-hdmilarb 45/45] drivers/iommu/iommu.c:929:72: warning: cast to smaller integer type 'unsigned int' from 'struct iommu_group *'

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

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tree:   https://github.com/frank-w/BPI-R2-4.14 5.14-hdmilarb
head:   a11fbee1b23c2d5f7c177ced2043eb54c53a5d50
commit: a11fbee1b23c2d5f7c177ced2043eb54c53a5d50 [45/45] iommu: add debug
config: x86_64-randconfig-b001-20210714 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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 x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://github.com/frank-w/BPI-R2-4.14/commit/a11fbee1b23c2d5f7c177ced2043eb54c53a5d50
        git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14
        git fetch --no-tags frank-w-bpi-r2-4.14 5.14-hdmilarb
        git checkout a11fbee1b23c2d5f7c177ced2043eb54c53a5d50
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> drivers/iommu/iommu.c:929:72: warning: cast to smaller integer type 'unsigned int' from 'struct iommu_group *' [-Wpointer-to-int-cast]
   printk(KERN_ALERT "DEBUG: Passed %s %d 0x%08x\n",__FUNCTION__,__LINE__,(unsigned int)group);
                                                                          ^~~~~~~~~~~~~~~~~~~
>> drivers/iommu/iommu.c:926:22: warning: ISO C90 forbids mixing declarations and code [-Wdeclaration-after-statement]
           struct iommu_group *group = dev->iommu_group;
                               ^
   2 warnings generated.


vim +929 drivers/iommu/iommu.c

   915	
   916	/**
   917	 * iommu_group_remove_device - remove a device from it's current group
   918	 * @dev: device to be removed
   919	 *
   920	 * This function is called by an iommu driver to remove the device from
   921	 * it's current group.  This decrements the iommu group reference count.
   922	 */
   923	void iommu_group_remove_device(struct device *dev)
   924	{
   925	printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
 > 926		struct iommu_group *group = dev->iommu_group;
   927		struct group_device *tmp_device, *device = NULL;
   928	
 > 929	printk(KERN_ALERT "DEBUG: Passed %s %d 0x%08x\n",__FUNCTION__,__LINE__,(unsigned int)group);
   930		//dev_info(dev, "Removing from iommu group %d\n", group->id);
   931	
   932		/* Pre-notify listeners that a device is being removed. */
   933		blocking_notifier_call_chain(&group->notifier,
   934					     IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
   935	printk(KERN_ALERT "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__);
   936		mutex_lock(&group->mutex);
   937		list_for_each_entry(tmp_device, &group->devices, list) {
   938			if (tmp_device->dev == dev) {
   939				device = tmp_device;
   940				list_del(&device->list);
   941				break;
   942			}
   943		}
   944		mutex_unlock(&group->mutex);
   945	
   946		if (!device)
   947			return;
   948	
   949		sysfs_remove_link(group->devices_kobj, device->name);
   950		sysfs_remove_link(&dev->kobj, "iommu_group");
   951	
   952		trace_remove_device_from_group(group->id, dev);
   953	
   954		kfree(device->name);
   955		kfree(device);
   956		dev->iommu_group = NULL;
   957		kobject_put(group->devices_kobj);
   958	}
   959	EXPORT_SYMBOL_GPL(iommu_group_remove_device);
   960	

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

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