tree: https://android.googlesource.com/kernel/common android-4.19 head: 45a6d3f5180d2d65d6d83fc9ecfa93fd2a332a67 commit: 748a437c5c0179283ae1814b612f9e1a744f3839 [12/14] UPSTREAM: virtio-pmem: Add virtio pmem driver config: x86_64-randconfig-s021-20201231 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-184-g1b896707-dirty git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android-4.19 git checkout 748a437c5c0179283ae1814b612f9e1a744f3839 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/nvdimm/nd_virtio.c:56:28: sparse: expected unsigned int [usertype] type drivers/nvdimm/nd_virtio.c:56:28: sparse: got restricted __virtio32 drivers/nvdimm/nd_virtio.c:93:59: sparse: expected restricted __virtio32 [usertype] val drivers/nvdimm/nd_virtio.c:93:59: sparse: got unsigned int [usertype] ret vim +56 drivers/nvdimm/nd_virtio.c 36 37 /* The request submission function */ 38 static int virtio_pmem_flush(struct nd_region *nd_region) 39 { 40 struct virtio_device *vdev = nd_region->provider_data; 41 struct virtio_pmem *vpmem = vdev->priv; 42 struct virtio_pmem_request *req_data; 43 struct scatterlist *sgs[2], sg, ret; 44 unsigned long flags; 45 int err, err1; 46 47 might_sleep(); 48 req_data = kmalloc(sizeof(*req_data), GFP_KERNEL); 49 if (!req_data) 50 return -ENOMEM; 51 52 req_data->done = false; 53 init_waitqueue_head(&req_data->host_acked); 54 init_waitqueue_head(&req_data->wq_buf); 55 INIT_LIST_HEAD(&req_data->list); 57 sg_init_one(&sg, &req_data->req, sizeof(req_data->req)); 58 sgs[0] = &sg; 59 sg_init_one(&ret, &req_data->resp.ret, sizeof(req_data->resp)); 60 sgs[1] = &ret; 61 62 spin_lock_irqsave(&vpmem->pmem_lock, flags); 63 /* 64 * If virtqueue_add_sgs returns -ENOSPC then req_vq virtual 65 * queue does not have free descriptor. We add the request 66 * to req_list and wait for host_ack to wake us up when free 67 * slots are available. 68 */ 69 while ((err = virtqueue_add_sgs(vpmem->req_vq, sgs, 1, 1, req_data, 70 GFP_ATOMIC)) == -ENOSPC) { 71 72 dev_info(&vdev->dev, "failed to send command to virtio pmem device, no free slots in the virtqueue\n"); 73 req_data->wq_buf_avail = false; 74 list_add_tail(&req_data->list, &vpmem->req_list); 75 spin_unlock_irqrestore(&vpmem->pmem_lock, flags); 76 77 /* A host response results in "host_ack" getting called */ 78 wait_event(req_data->wq_buf, req_data->wq_buf_avail); 79 spin_lock_irqsave(&vpmem->pmem_lock, flags); 80 } 81 err1 = virtqueue_kick(vpmem->req_vq); 82 spin_unlock_irqrestore(&vpmem->pmem_lock, flags); 83 /* 84 * virtqueue_add_sgs failed with error different than -ENOSPC, we can't 85 * do anything about that. 86 */ 87 if (err || !err1) { 88 dev_info(&vdev->dev, "failed to send command to virtio pmem device\n"); 89 err = -EIO; 90 } else { 91 /* A host repsonse results in "host_ack" getting called */ 92 wait_event(req_data->host_acked, req_data->done); 94 } 95 96 kfree(req_data); 97 return err; 98 }; 99 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org