[vhost:linux-next 6/19] drivers/remoteproc/remoteproc_virtio.c:148:9: error: 'ctx' undeclared

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
head:   d01047cb281d27bcedbf705089bdd38d86d20b01
commit: a965e977a1038cd738f874b5ee8a16d4fa55c64d [6/19] virtio: add context 
flag to find vqs
config: x86_64-randconfig-x015-201713 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout a965e977a1038cd738f874b5ee8a16d4fa55c64d
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the vhost/linux-next HEAD d01047cb281d27bcedbf705089bdd38d86d20b01 builds 
fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   drivers/remoteproc/remoteproc_virtio.c: In function 'rproc_virtio_find_vqs':
>> drivers/remoteproc/remoteproc_virtio.c:148:9: error: 'ctx' undeclared (first 
>> use in this function)
            ctx ? ctx[i] : false);
            ^~~
   drivers/remoteproc/remoteproc_virtio.c:148:9: note: each undeclared 
identifier is reported only once for each function it appears in

vim +/ctx +148 drivers/remoteproc/remoteproc_virtio.c

   142                                   struct irq_affinity *desc)
   143  {
   144          int i, ret;
   145  
   146          for (i = 0; i < nvqs; ++i) {
   147                  vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i],
 > 148                                      ctx ? ctx[i] : false);
   149                  if (IS_ERR(vqs[i])) {
   150                          ret = PTR_ERR(vqs[i]);
   151                          goto error;

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