tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 7eac66d0456fe12a462e5c14c68e97c7460989da commit: 94abbccdf2916cb03f9626f2d36c6e9971490c12 vdpa/mlx5: Add shared memory registration code date: 2 weeks ago config: x86_64-randconfig-m001-20200820 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 94abbccdf2916cb03f9626f2d36c6e9971490c12 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>): ld: drivers/vdpa/mlx5/core/mr.o: in function `map_direct_mr': ld: drivers/vdpa/mlx5/core/mr.c:261: undefined reference to `vhost_iotlb_itree_next' ld: drivers/vdpa/mlx5/core/mr.o: in function `_mlx5_vdpa_create_mr': drivers/vdpa/mlx5/core/mr.c:377: undefined reference to `vhost_iotlb_itree_first' ld: drivers/vdpa/mlx5/core/mr.c:378: undefined reference to `vhost_iotlb_itree_next' ld: drivers/vdpa/mlx5/core/mr.o: in function `map_empty': drivers/vdpa/mlx5/core/mr.c:460: undefined reference to `vhost_iotlb_itree_first' # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 94abbccdf2916cb03f9626f2d36c6e9971490c12 vim +244 drivers/vdpa/mlx5/core/mr.c 225 226 static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr *mr, 227 struct vhost_iotlb *iotlb) 228 { 229 struct vhost_iotlb_map *map; 230 unsigned long lgcd = 0; 231 int log_entity_size; 232 unsigned long size; 233 u64 start = 0; 234 int err; 235 struct page *pg; 236 unsigned int nsg; 237 int sglen; 238 u64 pa; 239 u64 paend; 240 struct scatterlist *sg; 241 struct device *dma = mvdev->mdev->device; 242 int ret; 243 246 size = maplen(map, mr); 247 lgcd = gcd(lgcd, size); 248 start += size; 249 } 250 log_entity_size = ilog2(lgcd); 251 252 sglen = 1 << log_entity_size; 253 nsg = MLX5_DIV_ROUND_UP_POW2(mr->end - mr->start, log_entity_size); 254 255 err = sg_alloc_table(&mr->sg_head, nsg, GFP_KERNEL); 256 if (err) 257 return err; 258 259 sg = mr->sg_head.sgl; 261 map; map = vhost_iotlb_itree_next(map, mr->start, mr->end - 1)) { 262 paend = map->addr + maplen(map, mr); 263 for (pa = map->addr; pa < paend; pa += sglen) { 264 pg = pfn_to_page(__phys_to_pfn(pa)); 265 if (!sg) { 266 mlx5_vdpa_warn(mvdev, "sg null. start 0x%llx, end 0x%llx\n", 267 map->start, map->last + 1); 268 err = -ENOMEM; 269 goto err_map; 270 } 271 sg_set_page(sg, pg, sglen, 0); 272 sg = sg_next(sg); 273 if (!sg) 274 goto done; 275 } 276 } 277 done: 278 mr->log_size = log_entity_size; 279 mr->nsg = nsg; 280 ret = dma_map_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0); 281 if (!ret) 282 goto err_map; 283 284 err = create_direct_mr(mvdev, mr); 285 if (err) 286 goto err_direct; 287 288 return 0; 289 290 err_direct: 291 dma_unmap_sg_attrs(dma, mr->sg_head.sgl, mr->nsg, DMA_BIDIRECTIONAL, 0); 292 err_map: 293 sg_free_table(&mr->sg_head); 294 return err; 295 } 296 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org