Hi Dave, [auto build test WARNING on linus/master] [also build test WARNING on v4.13-rc3] [cannot apply to next-20170804] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Dave-Jiang/Adding-blk-mq-and-DMA-support-to-pmem-block-driver/20170804-191719 config: i386-randconfig-x018-201731 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): drivers//nvdimm/pmem.c: In function 'pmem_handle_cmd_dma': >> drivers//nvdimm/pmem.c:416:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] unmap->addr[1] = (dma_addr_t)cmd->sg; ^ drivers//nvdimm/pmem.c:421:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] unmap->addr[0] = (dma_addr_t)cmd->sg; ^ vim +416 drivers//nvdimm/pmem.c 347 348 static int pmem_handle_cmd_dma(struct pmem_cmd *cmd, bool is_write) 349 { 350 struct request *req = cmd->rq; 351 struct request_queue *q = req->q; 352 struct pmem_device *pmem = q->queuedata; 353 struct device *dev = to_dev(pmem); 354 phys_addr_t pmem_off = blk_rq_pos(req) * 512 + pmem->data_offset; 355 void *pmem_addr = pmem->virt_addr + pmem_off; 356 struct nd_region *nd_region = to_region(pmem); 357 size_t len; 358 struct dma_device *dma = cmd->chan->device; 359 struct dmaengine_unmap_data *unmap; 360 dma_cookie_t cookie; 361 struct dma_async_tx_descriptor *txd; 362 struct page *page; 363 unsigned int off; 364 int rc; 365 enum dma_data_direction dir; 366 dma_addr_t dma_addr; 367 368 if (req->cmd_flags & REQ_FLUSH) 369 nvdimm_flush(nd_region); 370 371 unmap = dmaengine_get_unmap_data(dma->dev, 2, GFP_NOWAIT); 372 if (!unmap) { 373 dev_dbg(dev, "failed to get dma unmap data\n"); 374 rc = -ENOMEM; 375 goto err; 376 } 377 378 /* 379 * If reading from pmem, writing to scatterlist, 380 * and if writing to pmem, reading from scatterlist. 381 */ 382 dir = is_write ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 383 cmd->sg_nents = blk_rq_map_sg(req->q, req, cmd->sg); 384 if (cmd->sg_nents < 1) { 385 rc = -EINVAL; 386 goto err; 387 } 388 389 if (cmd->sg_nents > 128) { 390 rc = -ENOMEM; 391 dev_warn(dev, "Number of sg greater than allocated\n"); 392 goto err; 393 } 394 395 rc = dma_map_sg(dma->dev, cmd->sg, cmd->sg_nents, dir); 396 if (rc < 1) { 397 rc = -ENXIO; 398 goto err; 399 } 400 401 len = blk_rq_payload_bytes(req); 402 page = virt_to_page(pmem_addr); 403 off = offset_in_page(pmem_addr); 404 dir = is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE; 405 dma_addr = dma_map_page(dma->dev, page, off, len, dir); 406 if (dma_mapping_error(dma->dev, unmap->addr[0])) { 407 dev_dbg(dma->dev, "src DMA mapping error\n"); 408 rc = -ENXIO; 409 goto err_unmap_sg; 410 } 411 412 unmap->len = len; 413 414 if (is_write) { 415 unmap->addr[0] = dma_addr; > 416 unmap->addr[1] = (dma_addr_t)cmd->sg; 417 unmap->to_cnt = 1; 418 unmap->from_cnt = 0; 419 dma_unmap_data_sg_from_nents(unmap, 2) = cmd->sg_nents; 420 } else { 421 unmap->addr[0] = (dma_addr_t)cmd->sg; 422 unmap->addr[1] = dma_addr; 423 unmap->from_cnt = 1; 424 unmap->to_cnt = 0; 425 dma_unmap_data_sg_to_nents(unmap, 2) = cmd->sg_nents; 426 } 427 428 txd = dma->device_prep_dma_memcpy_sg(cmd->chan, 429 cmd->sg, cmd->sg_nents, dma_addr, 430 !is_write, DMA_PREP_INTERRUPT); 431 if (!txd) { 432 dev_dbg(dma->dev, "dma prep failed\n"); 433 rc = -ENXIO; 434 goto err_unmap_buffer; 435 } 436 437 txd->callback_result = nd_pmem_dma_callback; 438 txd->callback_param = cmd; 439 dma_set_unmap(txd, unmap); 440 cookie = dmaengine_submit(txd); 441 if (dma_submit_error(cookie)) { 442 dev_dbg(dma->dev, "dma submit error\n"); 443 rc = -ENXIO; 444 goto err_set_unmap; 445 } 446 447 dmaengine_unmap_put(unmap); 448 dma_async_issue_pending(cmd->chan); 449 450 return 0; 451 452 err_set_unmap: 453 dmaengine_unmap_put(unmap); 454 err_unmap_buffer: 455 dma_unmap_page(dev, dma_addr, len, dir); 456 err_unmap_sg: 457 if (dir == DMA_TO_DEVICE) 458 dir = DMA_FROM_DEVICE; 459 else 460 dir = DMA_TO_DEVICE; 461 dma_unmap_sg(dev, cmd->sg, cmd->sg_nents, dir); 462 dmaengine_unmap_put(unmap); 463 err: 464 blk_mq_end_request(cmd->rq, rc); 465 return rc; 466 } 467 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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