WARNING: line length of 82 exceeds 80 columns
#44: FILE: drivers/virtio/virtio_ring.c:3167:
+ * Return: DMA address. Caller should check that by virtqueue_dma_mapping_error().

WARNING: line length of 81 exceeds 80 columns
#46: FILE: drivers/virtio/virtio_ring.c:3169:
+dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page,

WARNING: line length of 85 exceeds 80 columns
#58: FILE: drivers/virtio/virtio_ring.c:3181:
+	return dma_map_page_attrs(vring_dma_dev(vq), page, offset, size, dir, attrs);

WARNING: line length of 81 exceeds 80 columns
#97: FILE: include/linux/virtio.h:237:
+dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page,

total: 0 errors, 4 warnings, 0 checks, 73 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 6533aa836b59 ("virtio_ring: introduce dma map api for page") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 4 warnings, 0 checks, 73 lines checked