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: x86_64-randconfig-s022-20210105 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-208-g46a52ca4-dirty # https://github.com/0day-ci/linux/commit/c7f4454de15f02ea6be7591e8ab4520e21da646e 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 c7f4454de15f02ea6be7591e8ab4520e21da646e # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> "sparse warnings: (new ones prefixed by >>)" >> drivers/vfio/vfio_iommu_type1.c:160:32: sparse: sparse: Using plain integer as NULL pointer drivers/vfio/vfio_iommu_type1.c:176:23: sparse: sparse: Using plain integer as NULL pointer vim +160 drivers/vfio/vfio_iommu_type1.c 147 148 static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu, 149 struct iommu_group *iommu_group); 150 151 static void update_pinned_page_dirty_scope(struct vfio_iommu *iommu); 152 /* 153 * This code handles mapping and unmapping of user data buffers 154 * into DMA'ble space using the IOMMU 155 */ 156 157 static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu, 158 dma_addr_t start, size_t size) 159 { > 160 struct vfio_dma *res = 0; 161 struct rb_node *node = iommu->dma_list.rb_node; 162 163 while (node) { 164 struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node); 165 166 if (start < dma->iova + dma->size) { 167 res = dma; 168 if (start >= dma->iova) 169 break; 170 node = node->rb_left; 171 } else { 172 node = node->rb_right; 173 } 174 } 175 if (res && size && res->iova >= start + size) 176 res = 0; 177 return res; 178 } 179 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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