[vhost:vhost 6/19] drivers/net/virtio_net.c:2089:19: error: assignment of read-only location '*(ctx + (sizetype)rxq2vq(i))'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost
head:   674c124665ca2ff1bcf81b1b92a207f71a326742
commit: e43eed6b8068f1c570551fe33bed12ef840c956b [6/19] virtio_net: allow 
specifying context for rx
config: x86_64-acpi-redef (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout e43eed6b8068f1c570551fe33bed12ef840c956b
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the vhost/vhost HEAD 674c124665ca2ff1bcf81b1b92a207f71a326742 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   drivers/net/virtio_net.c: In function 'virtnet_find_vqs':
>> drivers/net/virtio_net.c:2089:19: error: assignment of read-only location 
>> '*(ctx + (sizetype)rxq2vq(i))'
       ctx[rxq2vq(i)] = true;
                      ^

vim +2089 drivers/net/virtio_net.c

  2083                  callbacks[txq2vq(i)] = skb_xmit_done;
  2084                  sprintf(vi->rq[i].name, "input.%d", i);
  2085                  sprintf(vi->sq[i].name, "output.%d", i);
  2086                  names[rxq2vq(i)] = vi->rq[i].name;
  2087                  names[txq2vq(i)] = vi->sq[i].name;
  2088                  if (ctx)
> 2089                          ctx[rxq2vq(i)] = true;
  2090          }
  2091  
  2092          ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, 
callbacks,

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.config.gz
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