From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CAAFFC433DF for ; Tue, 2 Jun 2020 10:17:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5589206A4 for ; Tue, 2 Jun 2020 10:17:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="GKCmkONL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728129AbgFBKRv (ORCPT ); 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Tue, 2 Jun 2020 10:17:05 +0000 (UTC) Received: from [10.72.12.83] (ovpn-12-83.pek2.redhat.com [10.72.12.83]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5E9C8100164D; Tue, 2 Jun 2020 10:16:54 +0000 (UTC) Subject: Re: [PATCH] vdpa: bypass waking up vhost_woker for vdpa vq kick To: Dan Carpenter , kbuild@lists.01.org, Zhu Lingshan , mst@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: lkp@intel.com, kbuild-all@lists.01.org, lulu@redhat.com, dan.daly@intel.com, cunming.liang@intel.com References: <20200602094203.GU30374@kadam> From: Jason Wang Message-ID: Date: Tue, 2 Jun 2020 18:16:50 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200602094203.GU30374@kadam> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020/6/2 下午5:42, Dan Carpenter wrote: > Hi Zhu, > > url: https://github.com/0day-ci/linux/commits/Zhu-Lingshan/vdpa-bypass-waking-up-vhost_woker-for-vdpa-vq-kick/20200526-133819 > base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next > config: x86_64-randconfig-m001-20200529 (attached as .config) > compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kbuild test robot > Reported-by: Dan Carpenter > > smatch warnings: > drivers/vhost/vdpa.c:348 vhost_vdpa_set_vring_kick() error: uninitialized symbol 'r'. > > # https://github.com/0day-ci/linux/commit/a84ddbf1ef29f18aafb2bb8a93bcedd4a29a967d > git remote add linux-review https://github.com/0day-ci/linux > git remote update linux-review > git checkout a84ddbf1ef29f18aafb2bb8a93bcedd4a29a967d > vim +/r +348 drivers/vhost/vdpa.c > > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 316 static long vhost_vdpa_set_vring_kick(struct vhost_virtqueue *vq, > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 317 void __user *argp) > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 318 { > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 319 bool pollstart = false, pollstop = false; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 320 struct file *eventfp, *filep = NULL; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 321 struct vhost_vring_file f; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 322 long r; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 323 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 324 if (copy_from_user(&f, argp, sizeof(f))) > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 325 return -EFAULT; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 326 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 327 eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 328 if (IS_ERR(eventfp)) { > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 329 r = PTR_ERR(eventfp); > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 330 return r; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 331 } > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 332 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 333 if (eventfp != vq->kick) { > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 334 pollstop = (filep = vq->kick) != NULL; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 335 pollstart = (vq->kick = eventfp) != NULL; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 336 } else > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 337 filep = eventfp; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 338 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 339 if (pollstop && vq->handle_kick) > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 340 vhost_vdpa_poll_stop(vq); > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 341 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 342 if (filep) > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 343 fput(filep); > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 344 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 345 if (pollstart && vq->handle_kick) > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 346 r = vhost_vdpa_poll_start(vq); > > "r" not initialized on else path. > > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 347 > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 @348 return r; > a84ddbf1ef29f1 Zhu Lingshan 2020-05-26 349 } Will fix. Thanks > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org