Hi Eric, I love your patch! Perhaps something to improve: [auto build test WARNING on iommu/next] [also build test WARNING on linus/master v5.10-rc4 next-20201116] [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: https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git next config: arm64-randconfig-r034-20201115 (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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/95e4ccc61b7a7c06e1e0c6c01f362d590... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Eric-Auger/SMMUv3-Nested-Stage-Setup-IOMMU-part/20201116-185039 git checkout 95e4ccc61b7a7c06e1e0c6c01f362d590136ad3c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (!info->flags & IOMMU_INV_PASID_FLAGS_PASID) ^ ~ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3010:8: note: add parentheses after the '!' to evaluate the bitwise operator first if (!info->flags & IOMMU_INV_PASID_FLAGS_PASID) ^ ( ) drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3010:8: note: add parentheses around left hand side expression to silence this warning if (!info->flags & IOMMU_INV_PASID_FLAGS_PASID) ^ ( ) 1 warning generated. vim +3010 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c 2960 2961 static int 2962 arm_smmu_cache_invalidate(struct iommu_domain *domain, struct device *dev, 2963 struct iommu_cache_invalidate_info *inv_info) 2964 { 2965 struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); 2966 struct arm_smmu_device *smmu = smmu_domain->smmu; 2967 2968 if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED) 2969 return -EINVAL; 2970 2971 if (!smmu) 2972 return -EINVAL; 2973 2974 if (inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1) 2975 return -EINVAL; 2976 2977 if (inv_info->cache & IOMMU_CACHE_INV_TYPE_IOTLB) { 2978 if (inv_info->granularity == IOMMU_INV_GRANU_PASID) { 2979 struct iommu_inv_pasid_info *info = 2980 &inv_info->granu.pasid_info; 2981 2982 if (!(info->flags & IOMMU_INV_PASID_FLAGS_ARCHID) || 2983 (info->flags & IOMMU_INV_PASID_FLAGS_PASID)) 2984 return -EINVAL; 2985 2986 __arm_smmu_tlb_inv_context(smmu_domain, info->archid); 2987 2988 } else if (inv_info->granularity == IOMMU_INV_GRANU_ADDR) { 2989 struct iommu_inv_addr_info *info = &inv_info->granu.addr_info; 2990 size_t size = info->nb_granules * info->granule_size; 2991 bool leaf = info->flags & IOMMU_INV_ADDR_FLAGS_LEAF; 2992 2993 if (!(info->flags & IOMMU_INV_ADDR_FLAGS_ARCHID) || 2994 (info->flags & IOMMU_INV_ADDR_FLAGS_PASID)) 2995 return -EINVAL; 2996 2997 __arm_smmu_tlb_inv_range(info->addr, size, 2998 info->granule_size, leaf, 2999 smmu_domain, info->archid); 3000 3001 arm_smmu_cmdq_issue_sync(smmu); 3002 } else { 3003 return -EINVAL; 3004 } 3005 } else if (inv_info->cache & IOMMU_CACHE_INV_TYPE_PASID) { 3006 if (inv_info->granularity == IOMMU_INV_GRANU_PASID) { 3007 struct iommu_inv_pasid_info *info = 3008 &inv_info->granu.pasid_info; 3009 3011 return -EINVAL; 3012 3013 arm_smmu_sync_cd(smmu_domain, info->pasid, true); 3014 } else { 3015 return -ENOENT; 3016 } 3017 } else { /* IOMMU_CACHE_INV_TYPE_DEV_IOTLB */ 3018 return -ENOENT; 3019 } 3020 return 0; 3021 } 3022 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org