Re: drivers/vdpa/mlx5/core/mr.c:244: undefined reference to `vhost_iotlb_itree_first'

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Aug 20, 2020 at 11:36:15PM +0800, kernel test robot wrote:
> 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@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    ld: drivers/vdpa/mlx5/core/mr.o: in function `map_direct_mr':
> >> drivers/vdpa/mlx5/core/mr.c:244: undefined reference to `vhost_iotlb_itree_first'
> >> ld: drivers/vdpa/mlx5/core/mr.c:245: undefined reference to `vhost_iotlb_itree_next'
> >> ld: drivers/vdpa/mlx5/core/mr.c:260: undefined reference to `vhost_iotlb_itree_first'
>    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'

Looks like a missing select VHOST_IOTLB, right?


> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=94abbccdf2916cb03f9626f2d36c6e9971490c12
> 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	
>  > 244		for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
>  > 245		     map; map = vhost_iotlb_itree_next(map, start, mr->end - 1)) {
>    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;
>  > 260		for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
>    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