Hi Xuan, kernel test robot noticed the following build warnings: [auto build test WARNING on v6.4] [cannot apply to mst-vhost/linux-next linus/master v6.5-rc2 v6.5-rc1 next-20230719] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Xuan-Zhuo/virtio_ring-check-use_dma_api-before-unmap-desc-for-indirect/20230719-121424 base: v6.4 patch link: https://lore.kernel.org/r/20230719040422.126357-11-xuanzhuo%40linux.alibaba.com patch subject: [PATCH vhost v12 10/10] virtio_net: merge dma operations when filling mergeable buffers config: i386-randconfig-i006-20230718 (https://download.01.org/0day-ci/archive/20230719/202307191819.0tatknWa-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce: (https://download.01.org/0day-ci/archive/20230719/202307191819.0tatknWa-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202307191819.0tatknWa-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): drivers/net/virtio_net.c: In function 'virtnet_rq_init_one_sg': >> drivers/net/virtio_net.c:624:41: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] 624 | rq->sg[0].dma_address = (dma_addr_t)addr; | ^ drivers/net/virtio_net.c: In function 'virtnet_rq_alloc': >> drivers/net/virtio_net.c:682:28: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] 682 | *sg_addr = (void *)(dma->addr + alloc_frag->offset - sizeof(*dma)); | ^ vim +624 drivers/net/virtio_net.c 619 620 static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *addr, u32 len) 621 { 622 if (rq->do_dma) { 623 sg_init_table(rq->sg, 1); > 624 rq->sg[0].dma_address = (dma_addr_t)addr; 625 rq->sg[0].length = len; 626 } else { 627 sg_init_one(rq->sg, addr, len); 628 } 629 } 630 631 static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, 632 void **sg_addr, gfp_t gfp) 633 { 634 struct page_frag *alloc_frag = &rq->alloc_frag; 635 struct virtnet_rq_dma *dma; 636 struct device *dev; 637 void *buf, *head; 638 dma_addr_t addr; 639 640 if (unlikely(!skb_page_frag_refill(size, alloc_frag, gfp))) 641 return NULL; 642 643 head = (char *)page_address(alloc_frag->page); 644 645 if (rq->do_dma) { 646 dma = head; 647 648 /* new pages */ 649 if (!alloc_frag->offset) { 650 if (rq->last_dma) { 651 /* Now, the new page is allocated, the last dma 652 * will not be used. So the dma can be unmapped 653 * if the ref is 0. 654 */ 655 virtnet_rq_unmap(rq, rq->last_dma, 0); 656 rq->last_dma = NULL; 657 } 658 659 dev = virtqueue_dma_dev(rq->vq); 660 661 dma->len = alloc_frag->size - sizeof(*dma); 662 663 addr = dma_map_single_attrs(dev, dma + 1, dma->len, DMA_FROM_DEVICE, 0); 664 if (addr == DMA_MAPPING_ERROR) 665 return NULL; 666 667 dma->addr = addr; 668 dma->need_sync = dma_need_sync(dev, addr); 669 670 /* Add a reference to dma to prevent the entire dma from 671 * being released during error handling. This reference 672 * will be freed after the pages are no longer used. 673 */ 674 get_page(alloc_frag->page); 675 dma->ref = 1; 676 alloc_frag->offset = sizeof(*dma); 677 678 rq->last_dma = dma; 679 } 680 681 ++dma->ref; > 682 *sg_addr = (void *)(dma->addr + alloc_frag->offset - sizeof(*dma)); 683 } else { 684 *sg_addr = head + alloc_frag->offset; 685 } 686 687 buf = head + alloc_frag->offset; 688 689 get_page(alloc_frag->page); 690 alloc_frag->offset += size; 691 692 return buf; 693 } 694 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
