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Message-ID: <202404120044.VKtjHMzy-lkp@intel.com>
Date: Fri, 12 Apr 2024 00:34:28 +0800
From: kernel test robot <lkp@...el.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, virtualization@...ts.linux.dev
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org
Subject: Re: [PATCH vhost 4/6] virtio_net: big mode support premapped
Hi Xuan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.9-rc3 next-20240411]
[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-introduce-dma-map-api-for-page/20240411-105318
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20240411025127.51945-5-xuanzhuo%40linux.alibaba.com
patch subject: [PATCH vhost 4/6] virtio_net: big mode support premapped
config: i386-randconfig-016-20240411 (https://download.01.org/0day-ci/archive/20240412/202404120044.VKtjHMzy-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240412/202404120044.VKtjHMzy-lkp@intel.com/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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404120044.VKtjHMzy-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/net/virtio_net.c:449:21: warning: implicit conversion from 'dma_addr_t' (aka 'unsigned long long') to 'unsigned long' changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion]
449 | page_dma_addr(p) = DMA_MAPPING_ERROR;
| ~ ^~~~~~~~~~~~~~~~~
include/linux/dma-mapping.h:75:29: note: expanded from macro 'DMA_MAPPING_ERROR'
75 | #define DMA_MAPPING_ERROR (~(dma_addr_t)0)
| ^~~~~~~~~~~~~~
>> drivers/net/virtio_net.c:485:26: warning: result of comparison of constant 18446744073709551615 with expression of type 'unsigned long' is always false [-Wtautological-constant-out-of-range-compare]
485 | if (page_dma_addr(page) == DMA_MAPPING_ERROR) {
| ~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~
2 warnings generated.
vim +449 drivers/net/virtio_net.c
443
444 static void page_chain_unmap(struct receive_queue *rq, struct page *p)
445 {
446 virtqueue_dma_unmap_page_attrs(rq->vq, page_dma_addr(p), PAGE_SIZE,
447 DMA_FROM_DEVICE, 0);
448
> 449 page_dma_addr(p) = DMA_MAPPING_ERROR;
450 }
451
452 static int page_chain_map(struct receive_queue *rq, struct page *p)
453 {
454 dma_addr_t addr;
455
456 addr = virtqueue_dma_map_page_attrs(rq->vq, p, 0, PAGE_SIZE, DMA_FROM_DEVICE, 0);
457 if (virtqueue_dma_mapping_error(rq->vq, addr))
458 return -ENOMEM;
459
460 page_dma_addr(p) = addr;
461 return 0;
462 }
463
464 static void page_chain_release(struct receive_queue *rq)
465 {
466 struct page *p, *n;
467
468 for (p = rq->pages; p; p = n) {
469 n = page_chain_next(p);
470
471 page_chain_unmap(rq, p);
472 __free_pages(p, 0);
473 }
474
475 rq->pages = NULL;
476 }
477
478 /*
479 * put the whole most recent used list in the beginning for reuse
480 */
481 static void give_pages(struct receive_queue *rq, struct page *page)
482 {
483 struct page *end;
484
> 485 if (page_dma_addr(page) == DMA_MAPPING_ERROR) {
486 if (page_chain_map(rq, page)) {
487 __free_pages(page, 0);
488 return;
489 }
490 }
491
492 /* Find end of list, sew whole thing into vi->rq.pages. */
493 for (end = page; page_chain_next(end); end = page_chain_next(end));
494
495 page_chain_add(end, rq->pages);
496 rq->pages = page;
497 }
498
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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