Hi Jason, I love your patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on next-20200414] [cannot apply to powerpc/next s390/features v5.7-rc1] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Jason-Wang/vhost-do-not-enable-V... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: ia64-randconfig-a001-20200415 (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): drivers/vhost/vhost.c: In function 'vhost_vring_ioctl': 1577 | eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); | ^~~~~~~~~~~~ | eventfd_signal 1577 | eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); | ^ cc1: some warnings being treated as errors vim +1577 drivers/vhost/vhost.c feebcaeac79ad8 Jason Wang 2019-05-24 1493 feebcaeac79ad8 Jason Wang 2019-05-24 1494 static long vhost_vring_set_num_addr(struct vhost_dev *d, feebcaeac79ad8 Jason Wang 2019-05-24 1495 struct vhost_virtqueue *vq, feebcaeac79ad8 Jason Wang 2019-05-24 1496 unsigned int ioctl, feebcaeac79ad8 Jason Wang 2019-05-24 1497 void __user *argp) feebcaeac79ad8 Jason Wang 2019-05-24 1498 { feebcaeac79ad8 Jason Wang 2019-05-24 1499 long r; feebcaeac79ad8 Jason Wang 2019-05-24 1500 feebcaeac79ad8 Jason Wang 2019-05-24 1501 mutex_lock(&vq->mutex); feebcaeac79ad8 Jason Wang 2019-05-24 1502 feebcaeac79ad8 Jason Wang 2019-05-24 1503 switch (ioctl) { feebcaeac79ad8 Jason Wang 2019-05-24 1504 case VHOST_SET_VRING_NUM: feebcaeac79ad8 Jason Wang 2019-05-24 1505 r = vhost_vring_set_num(d, vq, argp); feebcaeac79ad8 Jason Wang 2019-05-24 1506 break; feebcaeac79ad8 Jason Wang 2019-05-24 1507 case VHOST_SET_VRING_ADDR: feebcaeac79ad8 Jason Wang 2019-05-24 1508 r = vhost_vring_set_addr(d, vq, argp); feebcaeac79ad8 Jason Wang 2019-05-24 1509 break; feebcaeac79ad8 Jason Wang 2019-05-24 1510 default: feebcaeac79ad8 Jason Wang 2019-05-24 1511 BUG(); feebcaeac79ad8 Jason Wang 2019-05-24 1512 } feebcaeac79ad8 Jason Wang 2019-05-24 1513 feebcaeac79ad8 Jason Wang 2019-05-24 1514 mutex_unlock(&vq->mutex); feebcaeac79ad8 Jason Wang 2019-05-24 1515 feebcaeac79ad8 Jason Wang 2019-05-24 1516 return r; feebcaeac79ad8 Jason Wang 2019-05-24 1517 } 26b36604523f4a Sonny Rao 2018-03-14 1518 long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *argp) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1519 { cecb46f194460d Al Viro 2012-08-27 1520 struct file *eventfp, *filep = NULL; cecb46f194460d Al Viro 2012-08-27 1521 bool pollstart = false, pollstop = false; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1522 struct eventfd_ctx *ctx = NULL; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1523 u32 __user *idxp = argp; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1524 struct vhost_virtqueue *vq; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1525 struct vhost_vring_state s; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1526 struct vhost_vring_file f; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1527 u32 idx; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1528 long r; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1529 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1530 r = get_user(idx, idxp); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1531 if (r < 0) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1532 return r; 0f3d9a17469d71 Krishna Kumar 2010-05-25 1533 if (idx >= d->nvqs) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1534 return -ENOBUFS; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1535 ff002269a4ee9c Jason Wang 2018-10-30 1536 idx = array_index_nospec(idx, d->nvqs); 3ab2e420ec1caf Asias He 2013-04-27 1537 vq = d->vqs[idx]; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1538 feebcaeac79ad8 Jason Wang 2019-05-24 1539 if (ioctl == VHOST_SET_VRING_NUM || feebcaeac79ad8 Jason Wang 2019-05-24 1540 ioctl == VHOST_SET_VRING_ADDR) { feebcaeac79ad8 Jason Wang 2019-05-24 1541 return vhost_vring_set_num_addr(d, vq, ioctl, argp); feebcaeac79ad8 Jason Wang 2019-05-24 1542 } feebcaeac79ad8 Jason Wang 2019-05-24 1543 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1544 mutex_lock(&vq->mutex); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1545 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1546 switch (ioctl) { 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1547 case VHOST_SET_VRING_BASE: 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1548 /* Moving base with an active backend? 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1549 * You don't want to do that. */ 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1550 if (vq->private_data) { 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1551 r = -EBUSY; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1552 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1553 } 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1554 if (copy_from_user(&s, argp, sizeof s)) { 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1555 r = -EFAULT; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1556 break; 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1557 } 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1558 if (s.num > 0xffff) { 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1559 r = -EINVAL; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1560 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1561 } 8d65843c44269c Jason Wang 2017-07-27 1562 vq->last_avail_idx = s.num; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1563 /* Forget the cached index value. */ 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1564 vq->avail_idx = vq->last_avail_idx; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1565 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1566 case VHOST_GET_VRING_BASE: 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1567 s.index = idx; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1568 s.num = vq->last_avail_idx; 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1569 if (copy_to_user(argp, &s, sizeof s)) 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1570 r = -EFAULT; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1571 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1572 case VHOST_SET_VRING_KICK: 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1573 if (copy_from_user(&f, argp, sizeof f)) { 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1574 r = -EFAULT; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1575 break; 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1576 } 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 @1577 eventfp = f.fd == -1 ? NULL : eventfd_fget(f.fd); 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1578 if (IS_ERR(eventfp)) { 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1579 r = PTR_ERR(eventfp); 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1580 break; 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1581 } 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1582 if (eventfp != vq->kick) { cecb46f194460d Al Viro 2012-08-27 1583 pollstop = (filep = vq->kick) != NULL; cecb46f194460d Al Viro 2012-08-27 1584 pollstart = (vq->kick = eventfp) != NULL; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1585 } else 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1586 filep = eventfp; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1587 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1588 case VHOST_SET_VRING_CALL: 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1589 if (copy_from_user(&f, argp, sizeof f)) { 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1590 r = -EFAULT; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1591 break; 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1592 } e050c7d93f4adb Eric Biggers 2018-01-06 1593 ctx = f.fd == -1 ? NULL : eventfd_ctx_fdget(f.fd); e050c7d93f4adb Eric Biggers 2018-01-06 1594 if (IS_ERR(ctx)) { e050c7d93f4adb Eric Biggers 2018-01-06 1595 r = PTR_ERR(ctx); 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1596 break; 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1597 } e050c7d93f4adb Eric Biggers 2018-01-06 1598 swap(ctx, vq->call_ctx); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1599 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1600 case VHOST_SET_VRING_ERR: 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1601 if (copy_from_user(&f, argp, sizeof f)) { 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1602 r = -EFAULT; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1603 break; 7ad9c9d2704854 Takuya Yoshikawa 2010-05-27 1604 } 09f332a589232f Eric Biggers 2018-01-06 1605 ctx = f.fd == -1 ? NULL : eventfd_ctx_fdget(f.fd); 09f332a589232f Eric Biggers 2018-01-06 1606 if (IS_ERR(ctx)) { 09f332a589232f Eric Biggers 2018-01-06 1607 r = PTR_ERR(ctx); 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1608 break; 535297a6ae4c3b Michael S. Tsirkin 2010-03-17 1609 } 09f332a589232f Eric Biggers 2018-01-06 1610 swap(ctx, vq->error_ctx); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1611 break; 2751c9882b9472 Greg Kurz 2015-04-24 1612 case VHOST_SET_VRING_ENDIAN: 2751c9882b9472 Greg Kurz 2015-04-24 1613 r = vhost_set_vring_endian(vq, argp); 2751c9882b9472 Greg Kurz 2015-04-24 1614 break; 2751c9882b9472 Greg Kurz 2015-04-24 1615 case VHOST_GET_VRING_ENDIAN: 2751c9882b9472 Greg Kurz 2015-04-24 1616 r = vhost_get_vring_endian(vq, idx, argp); 2751c9882b9472 Greg Kurz 2015-04-24 1617 break; 03088137246065 Jason Wang 2016-03-04 1618 case VHOST_SET_VRING_BUSYLOOP_TIMEOUT: 03088137246065 Jason Wang 2016-03-04 1619 if (copy_from_user(&s, argp, sizeof(s))) { 03088137246065 Jason Wang 2016-03-04 1620 r = -EFAULT; 03088137246065 Jason Wang 2016-03-04 1621 break; 03088137246065 Jason Wang 2016-03-04 1622 } 03088137246065 Jason Wang 2016-03-04 1623 vq->busyloop_timeout = s.num; 03088137246065 Jason Wang 2016-03-04 1624 break; 03088137246065 Jason Wang 2016-03-04 1625 case VHOST_GET_VRING_BUSYLOOP_TIMEOUT: 03088137246065 Jason Wang 2016-03-04 1626 s.index = idx; 03088137246065 Jason Wang 2016-03-04 1627 s.num = vq->busyloop_timeout; 03088137246065 Jason Wang 2016-03-04 1628 if (copy_to_user(argp, &s, sizeof(s))) 03088137246065 Jason Wang 2016-03-04 1629 r = -EFAULT; 03088137246065 Jason Wang 2016-03-04 1630 break; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1631 default: 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1632 r = -ENOIOCTLCMD; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1633 } 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1634 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1635 if (pollstop && vq->handle_kick) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1636 vhost_poll_stop(&vq->poll); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1637 e050c7d93f4adb Eric Biggers 2018-01-06 1638 if (!IS_ERR_OR_NULL(ctx)) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1639 eventfd_ctx_put(ctx); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1640 if (filep) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1641 fput(filep); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1642 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1643 if (pollstart && vq->handle_kick) 2b8b328b61c799 Jason Wang 2013-01-28 1644 r = vhost_poll_start(&vq->poll, vq->kick); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1645 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1646 mutex_unlock(&vq->mutex); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1647 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1648 if (pollstop && vq->handle_kick) 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1649 vhost_poll_flush(&vq->poll); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1650 return r; 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1651 } 6ac1afbf6132df Asias He 2013-05-06 1652 EXPORT_SYMBOL_GPL(vhost_vring_ioctl); 3a4d5c94e95935 Michael S. Tsirkin 2010-01-14 1653 :::::: The code at line 1577 was first introduced by commit :::::: 3a4d5c94e959359ece6d6b55045c3f046677f55c vhost_net: a kernel-level virtio server :::::: TO: Michael S. Tsirkin <mst(a)redhat.com&gt; :::::: CC: David S. Miller <davem(a)davemloft.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org