Hi Eric, I love your patch! Yet something to improve: [auto build test ERROR on v5.12-rc6] [also build test ERROR on next-20210409] [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-S... base: e49d033bddf5b565044e2abe4241353959bc9120 config: i386-randconfig-s001-20210411 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-279-g6d5d9b42-dirty # https://github.com/0day-ci/linux/commit/8a9991f0409cae6af9a387b8b90dbb7ad... 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/20210411-195216 git checkout 8a9991f0409cae6af9a387b8b90dbb7ad004f590 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/vfio.h:16, from drivers/vfio/vfio_iommu_type1.c:37: include/uapi/linux/vfio.h:1226:34: error: field 'config' has incomplete type 1226 | struct iommu_pasid_table_config config; /* used on SET */ | ^~~~~~ drivers/vfio/vfio_iommu_type1.c: In function 'vfio_detach_pasid_table': drivers/vfio/vfio_iommu_type1.c:2872:3: error: implicit declaration of function 'iommu_detach_pasid_table'; did you mean 'vfio_detach_pasid_table'? [-Werror=implicit-function-declaration] 2872 | iommu_detach_pasid_table(d->domain); | ^~~~~~~~~~~~~~~~~~~~~~~~ | vfio_detach_pasid_table drivers/vfio/vfio_iommu_type1.c: In function 'vfio_attach_pasid_table': drivers/vfio/vfio_iommu_type1.c:2886:9: error: implicit declaration of function 'iommu_uapi_attach_pasid_table'; did you mean 'vfio_attach_pasid_table'? [-Werror=implicit-function-declaration] 2886 | ret = iommu_uapi_attach_pasid_table(d->domain, (void __user *)arg); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | vfio_attach_pasid_table drivers/vfio/vfio_iommu_type1.c: In function 'vfio_bind_msi': 2915 | ret = iommu_bind_guest_msi(d->domain, giova, gpa, size); | ^~~~~~~~~~~~~~~~~~~~ 2922 | iommu_unbind_guest_msi(d->domain, giova); | ^~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/iommu_bind_guest_msi +2915 drivers/vfio/vfio_iommu_type1.c 2904 2905 static int 2906 vfio_bind_msi(struct vfio_iommu *iommu, 2907 dma_addr_t giova, phys_addr_t gpa, size_t size) 2908 { 2909 struct vfio_domain *d; 2910 int ret = 0; 2911 2912 mutex_lock(&iommu->lock); 2913 2914 list_for_each_entry(d, &iommu->domain_list, next) { 2916 if (ret) 2917 goto unwind; 2918 } 2919 goto unlock; 2920 unwind: 2921 list_for_each_entry_continue_reverse(d, &iommu->domain_list, next) { 2923 } 2924 unlock: 2925 mutex_unlock(&iommu->lock); 2926 return ret; 2927 } 2928 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org