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@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> 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@xxxxxxxxxxxx
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