tree: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost head: 2b91e7f7cb5a6f12a2f43b200cb2d65a218237ed commit: 2b91e7f7cb5a6f12a2f43b200cb2d65a218237ed [6/6] vhost: batching fetches config: x86_64-allmodconfig (attached as .config) compiler: gcc-7 (Debian 7.4.0-13) 7.4.0 reproduce: git checkout 2b91e7f7cb5a6f12a2f43b200cb2d65a218237ed # save the attached .config to linux build tree make ARCH=x86_64
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <l...@intel.com>
All errors (new ones prefixed by >>):
drivers/vhost/vhost.c: In function 'vhost_get_vq_desc_batch':
>> drivers/vhost/vhost.c:2672:9: error: 'desc' undeclared (first use in this
>> function); did you mean 'rdtsc'?
if (!(desc->flags & VRING_DESC_F_NEXT))
^~~~
rdtsc
drivers/vhost/vhost.c:2672:9: note: each undeclared identifier is reported
only once for each function it appears in
vim +2672 drivers/vhost/vhost.c
2569
2570 /* This looks in the virtqueue and for the first available buffer, and
converts
2571 * it to an iovec for convenient access. Since descriptors consist of
some
2572 * number of output then some number of input descriptors, it's
actually two
2573 * iovecs, but we pack them into one and note how many of each there
were.
2574 *
2575 * This function returns the descriptor number found, or vq->num (which
is
2576 * never a valid descriptor number) if none was found. A negative code
is
2577 * returned on error. */
2578 int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq,
2579 struct iovec iov[], unsigned int iov_size,
2580 unsigned int *out_num, unsigned int *in_num,
2581 struct vhost_log *log, unsigned int *log_num)
2582 {
2583 int ret = fetch_descs(vq);
2584 struct vhost_desc *last;
2585 u16 id;
2586 int i;
2587
2588 if (ret)
2589 return ret;
2590
2591 /* Note: indirect descriptors are not batched */
2592 /* TODO: batch up to a limit */
2593 last = peek_split_desc(vq);
2594 id = last->id;
2595
2596 if (last->flags & VRING_DESC_F_INDIRECT) {
2597 int r;
2598
2599 pop_split_desc(vq);
2600 r = fetch_indirect_descs(vq, last, id);
2601 if (unlikely(r < 0)) {
2602 if (r != -EAGAIN)
2603 vq_err(vq, "Failure detected "
2604 "in indirect descriptor
at idx %d\n", id);
2605 return ret;
2606 }
2607 }
2608
2609 /* Now convert to IOV */
2610 /* When we start there are none of either input nor output. */
2611 *out_num = *in_num = 0;
2612 if (unlikely(log))
2613 *log_num = 0;
2614
2615 for (i = vq->first_desc; i < vq->ndescs; ++i) {
2616 unsigned iov_count = *in_num + *out_num;
2617 struct vhost_desc *desc = &vq->descs[i];
2618 int access;
2619
2620 if (desc->flags & ~VHOST_DESC_FLAGS) {
2621 vq_err(vq, "Unexpected flags: 0x%x at
descriptor id 0x%x\n",
2622 desc->flags, desc->id);
2623 ret = -EINVAL;
2624 goto err;
2625 }
2626 if (desc->flags & VRING_DESC_F_WRITE)
2627 access = VHOST_ACCESS_WO;
2628 else
2629 access = VHOST_ACCESS_RO;
2630 ret = translate_desc(vq, desc->addr,
2631 desc->len, iov + iov_count,
2632 iov_size - iov_count, access);
2633 if (unlikely(ret < 0)) {
2634 if (ret != -EAGAIN)
2635 vq_err(vq, "Translation failure %d
descriptor idx %d\n",
2636 ret, i);
2637 goto err;
2638 }
2639 if (access == VHOST_ACCESS_WO) {
2640 /* If this is an input descriptor,
2641 * increment that count. */
2642 *in_num += ret;
2643 if (unlikely(log && ret)) {
2644 log[*log_num].addr = desc->addr;
2645 log[*log_num].len = desc->len;
2646 ++*log_num;
2647 }
2648 } else {
2649 /* If it's an output descriptor, they're all
supposed
2650 * to come before any input descriptors. */
2651 if (unlikely(*in_num)) {
2652 vq_err(vq, "Descriptor has out after
in: "
2653 "idx %d\n", i);
2654 ret = -EINVAL;
2655 goto err;
2656 }
2657 *out_num += ret;
2658 }
2659
2660 ret = desc->id;
2661
2662 if (!(desc->flags & VRING_DESC_F_NEXT))
2663 break;
2664 }
2665
2666 vq->first_desc = i + 1;
2667
2668 return ret;
2669
2670 err:
2671 for (i = vq->first_desc; i < vq->ndescs; ++i)
> 2672 if (!(desc->flags & VRING_DESC_F_NEXT))
2673 vhost_discard_vq_desc(vq, 1);
2674 vq->ndescs = 0;
2675
2676 return ret;
2677 }
2678 EXPORT_SYMBOL_GPL(vhost_get_vq_desc_batch);
2679
---
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