Hi Steve,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on vfio/next]
[also build test WARNING on 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/Steve-Sistare/vfio-virtual-address-update/20210106-000752
base:   https://github.com/awilliam/linux-vfio.git next
config: s390-randconfig-r015-20210105 (attached as .config)
compiler: s390-linux-gcc (GCC) 9.3.0
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/0day-ci/linux/commit/f680b8156755f4465e94574d5421747561d23749
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Steve-Sistare/vfio-virtual-address-update/20210106-000752
        git checkout f680b8156755f4465e94574d5421747561d23749
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 

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/vfio/vfio_iommu_type1.c:503:6: warning: no previous prototype for 'vfio_vaddr_valid' [-Wmissing-prototypes]
     503 | bool vfio_vaddr_valid(struct vfio_iommu *iommu, struct vfio_dma *dma)
         |      ^~~~~~~~~~~~~~~~


vim +/vfio_vaddr_valid +503 drivers/vfio/vfio_iommu_type1.c

   501	
   502	
 > 503	bool vfio_vaddr_valid(struct vfio_iommu *iommu, struct vfio_dma *dma)
   504	{
   505		while (dma->suspended) {
   506			mutex_unlock(&iommu->lock);
   507			msleep_interruptible(10);
   508			mutex_lock(&iommu->lock);
   509			if (kthread_should_stop() || !vfio_iommu_contained(iommu) ||
   510			    fatal_signal_pending(current)) {
   511				return false;
   512			}
   513		}
   514		return true;
   515	}
   516	

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