Hi Eric, I love your patch! Perhaps something to improve: [auto build test WARNING on v5.10-rc4] [also build test WARNING on next-20201116] [cannot apply to vfio/next] [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/Eric-Auger/SMMUv3-Nested-Stage-Setup-VFIO-part/20201116-190742 base: 09162bc32c880a791c6c0668ce0745cf7958f576 config: powerpc64-randconfig-r026-20201116 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c044709b8fbea2a9a375e4173a6bd735f6866c0c) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://github.com/0day-ci/linux/commit/747ef402696e1192684908ca99f06f3d68466c04 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Eric-Auger/SMMUv3-Nested-Stage-Setup-VFIO-part/20201116-190742 git checkout 747ef402696e1192684908ca99f06f3d68466c04 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/vfio/pci/vfio_pci.c:26: In file included from include/linux/vfio.h:16: include/uapi/linux/vfio.h:1231:34: error: field has incomplete type 'struct iommu_pasid_table_config' struct iommu_pasid_table_config config; /* used on SET */ ^ include/uapi/linux/vfio.h:1231:9: note: forward declaration of 'struct iommu_pasid_table_config' struct iommu_pasid_table_config config; /* used on SET */ ^ >> drivers/vfio/pci/vfio_pci.c:339:5: warning: no previous prototype for function 'vfio_pci_iommu_dev_fault_handler' [-Wmissing-prototypes] int vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) ^ drivers/vfio/pci/vfio_pci.c:339:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) ^ static 1 warning and 1 error generated. vim +/vfio_pci_iommu_dev_fault_handler +339 drivers/vfio/pci/vfio_pci.c 338 > 339 int vfio_pci_iommu_dev_fault_handler(struct iommu_fault *fault, void *data) 340 { 341 struct vfio_pci_device *vdev = (struct vfio_pci_device *)data; 342 struct vfio_region_dma_fault *reg = 343 (struct vfio_region_dma_fault *)vdev->fault_pages; 344 struct iommu_fault *new; 345 u32 head, tail, size; 346 int ret = -EINVAL; 347 348 349 if (WARN_ON(!reg)) 350 return ret; 351 352 mutex_lock(&vdev->fault_queue_lock); 353 354 head = reg->head; 355 tail = reg->tail; 356 size = reg->nb_entries; 357 358 new = (struct iommu_fault *)(vdev->fault_pages + reg->offset + 359 head * reg->entry_size); 360 361 if (CIRC_SPACE(head, tail, size) < 1) { 362 ret = -ENOSPC; 363 goto unlock; 364 } 365 366 *new = *fault; 367 reg->head = (head + 1) % size; 368 ret = 0; 369 unlock: 370 mutex_unlock(&vdev->fault_queue_lock); 371 return ret; 372 } 373 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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