Hi Jiang, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on vhost/linux-next] [also build test WARNING on tip/perf/core linus/master v5.13-rc6] [cannot apply to next-20210616] [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/Jiang-Wang/virtio-vsock-introduc... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: x86_64-randconfig-a002-20210616 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/b156a0ad587c43dbfc98397f01b34fad1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jiang-Wang/virtio-vsock-introduce-SOCK_DGRAM-support/20210616-120056 git checkout b156a0ad587c43dbfc98397f01b34fad15054bf0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): bool added = false; ^ 1 warning generated. vim +/added +450 net/vmw_vsock/virtio_transport.c 444 445 static void virtio_transport_dgram_tx_work(struct work_struct *work) 446 { 447 struct virtio_vsock *vsock = 448 container_of(work, struct virtio_vsock, dgram_tx_work); 449 struct virtqueue *vq; 451 452 vq = vsock->vqs[VSOCK_VQ_DGRAM_TX]; 453 mutex_lock(&vsock->dgram_tx_lock); 454 455 if (!vsock->dgram_tx_run) 456 goto out; 457 458 do { 459 struct virtio_vsock_pkt *pkt; 460 unsigned int len; 461 462 virtqueue_disable_cb(vq); 463 while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { 464 virtio_transport_free_pkt(pkt); 465 added = true; 466 } 467 } while (!virtqueue_enable_cb(vq)); 468 469 out: 470 mutex_unlock(&vsock->dgram_tx_lock); 471 } 472 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org