[jgunthorpe:iommufd_noiommu 5/6] drivers/iommu/iommufd/io_pagetable.c:855:23: warning: variable 'area_iova' set but not used

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

tree:   https://github.com/jgunthorpe/linux iommufd_noiommu
head:   5259d5e34eb7da1c96802e79113ccca538730d5e
commit: ca213f193f2c2aa9b43a653bc6466e1216f6e767 [5/6] iommufd: Add an ioctl IOMMU_IOAS_GET_PA to query PA from IOVA
config: parisc-randconfig-001-20260203 (https://download.01.org/0day-ci/archive/20260203/202602030758.hZavVdX9-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 12.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260203/202602030758.hZavVdX9-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/202602030758.hZavVdX9-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/iommu/iommufd/io_pagetable.c: In function 'iopt_get_phys':
>> drivers/iommu/iommufd/io_pagetable.c:855:23: warning: variable 'area_iova' set but not used [-Wunused-but-set-variable]
     855 |         unsigned long area_iova;
         |                       ^~~~~~~~~


vim +/area_iova +855 drivers/iommu/iommufd/io_pagetable.c

   851	
   852	int iopt_get_phys(struct io_pagetable *iopt, unsigned long iova, u64 *paddr,
   853			  u64 *length)
   854	{
 > 855		unsigned long area_iova;
   856		struct iopt_area *area;
   857		int rc = 0;
   858	
   859		if (!IS_ENABLED(CONFIG_VFIO_NOIOMMU))
   860			return -EOPNOTSUPP;
   861	
   862		down_read(&iopt->iova_rwsem);
   863		area = iopt_area_iter_first(iopt, iova, iova);
   864		if (!area || !area->pages) {
   865			rc = -ENOENT;
   866			goto unlock_exit;
   867		}
   868	
   869		if (!area->storage_domain ||
   870		    area->storage_domain->owner != &iommufd_noiommu_ops) {
   871			rc = -EOPNOTSUPP;
   872			goto unlock_exit;
   873		}
   874	
   875		area_iova = iopt_area_iova(area);
   876		*paddr = iommu_iova_to_phys(area->storage_domain, iova);
   877		if (!*paddr) {
   878			rc = -EINVAL;
   879			goto unlock_exit;
   880		}
   881		/*
   882		 * TBD: we can return contiguous IOVA length so that userspace can
   883		 * keep searching for next physical address.
   884		 */
   885		*length = PAGE_SIZE;
   886	
   887	unlock_exit:
   888		up_read(&iopt->iova_rwsem);
   889	
   890		return rc;
   891	}
   892	

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