Re: [PATCH v13 5/5] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_VQ

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On 08/03/2017 09:05 PM, Pankaj Gupta wrote:
On 08/03/2017 04:13 PM, Pankaj Gupta wrote:
+        /* Allocate space for find_vqs parameters */
+        vqs = kcalloc(nvqs, sizeof(*vqs), GFP_KERNEL);
+        if (!vqs)
+                goto err_vq;
+        callbacks = kmalloc_array(nvqs, sizeof(*callbacks), GFP_KERNEL);
+        if (!callbacks)
+                goto err_callback;
+        names = kmalloc_array(nvqs, sizeof(*names), GFP_KERNEL);
is size here (integer) intentional?

Sorry, I didn't get it. Could you please elaborate more?
This is okay


+        if (!names)
+                goto err_names;
+
+        callbacks[0] = balloon_ack;
+        names[0] = "inflate";
+        callbacks[1] = balloon_ack;
+        names[1] = "deflate";
+
+        i = 2;
+        if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
+                callbacks[i] = stats_request;
just thinking if memory for callbacks[3] & names[3] is allocated?

Yes, the above kmalloc_array allocated them.
I mean we have created callbacks array for two entries 0,1?

callbacks = kmalloc_array(nvqs, sizeof(*callbacks), GFP_KERNEL);

But we are trying to access location '2' which is third:

          i = 2;
+        if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
+                callbacks[i] = stats_request;      <---- callbacks[2]
+                names[i] = "stats";                <----- names[2]
+                i++;
+        }

I am missing anything obvious here?


Yes.
if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ) is true
nvqs will be 3, that is, callbacks[2] is allocated.

Best,
Wei



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