Hi Xuan, Thank you for the patch! Yet something to improve: [auto build test ERROR on horms-ipvs/master] [also build test ERROR on linus/master v5.15-rc7] [cannot apply to mst-vhost/linux-next next-20211027] [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] url: https://github.com/0day-ci/linux/commits/Xuan-Zhuo/virtio-support-cache-indirect-desc/20211027-142025 base: https://git.kernel.org/pub/scm/linux/kernel/git/horms/ipvs.git master config: i386-buildonly-randconfig-r005-20211027 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5db7568a6a1fcb408eb8988abdaff2a225a8eb72) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/bb65ceda850ed4592d8a940e01926d5e3d33ae92 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xuan-Zhuo/virtio-support-cache-indirect-desc/20211027-142025 git checkout bb65ceda850ed4592d8a940e01926d5e3d33ae92 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> drivers/virtio/virtio_ring.c:1467:7: error: variable 'len' is uninitialized when used here [-Werror,-Wuninitialized] n = len / sizeof(struct vring_packed_desc); ^~~ drivers/virtio/virtio_ring.c:1460:10: note: initialize the variable 'len' to silence this warning u32 len, n; ^ = 0 1 error generated. vim +/len +1467 drivers/virtio/virtio_ring.c 1433 1434 static void detach_buf_packed(struct vring_virtqueue *vq, 1435 unsigned int id, void **ctx) 1436 { 1437 struct vring_desc_state_packed *state = NULL; 1438 struct vring_packed_desc *desc; 1439 unsigned int i, curr; 1440 1441 state = &vq->packed.desc_state[id]; 1442 1443 /* Clear data ptr. */ 1444 state->data = NULL; 1445 1446 vq->packed.desc_extra[state->last].next = vq->free_head; 1447 vq->free_head = id; 1448 vq->vq.num_free += state->num; 1449 1450 if (unlikely(vq->use_dma_api)) { 1451 curr = id; 1452 for (i = 0; i < state->num; i++) { 1453 vring_unmap_state_packed(vq, 1454 &vq->packed.desc_extra[curr]); 1455 curr = vq->packed.desc_extra[curr].next; 1456 } 1457 } 1458 1459 if (vq->indirect) { 1460 u32 len, n; 1461 1462 /* Free the indirect table, if any, now that it's unmapped. */ 1463 desc = state->indir_desc; 1464 if (!desc) 1465 return; 1466 > 1467 n = len / sizeof(struct vring_packed_desc); 1468 1469 if (vq->use_dma_api) { 1470 len = vq->packed.desc_extra[id].len; 1471 for (i = 0; i < n; i++) 1472 vring_unmap_desc_packed(vq, &desc[i]); 1473 } 1474 1475 desc_cache_put_packed(vq, desc, n); 1476 state->indir_desc = NULL; 1477 } else if (ctx) { 1478 *ctx = state->indir_desc; 1479 } 1480 } 1481 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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