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    SubjectRe: [PATCH] vdpa: bypass waking up vhost_woker for vdpa vq kick
    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 <lkp@intel.com>
    Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

    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 }

    ---
    0-DAY CI Kernel Test Service, Intel Corporation
    https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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