Re: [PATCH] virtio_balloon: high order allocation

[Soichiro Ueda <the.latticeheart@gmail.com>]

Hi, Shixin.

Thanks for checking the patch!

>> +			for (i = 0; i < num_pfns; i++) {
>> +				set_page_pfns(vb, vb->pfns + vb->num_pfns + i,
>> +					      nth_page(page, i));
>> +			}
> Since the interval of vb->num_pfns is VIRTIO_BALLOON_PAGES_PER_PAGE,
> it seems that the pfns[] should be vb->pfns + vb->num_pfns + i * VIRTIO_BALLOON_PAGES_PER_PAGE.
Definitely.
>> +			vb->num_pages +=
>> +				num_pfns * VIRTIO_BALLOON_PAGES_PER_PAGE;
>> +			if (!virtio_has_feature(
>> +				    vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM))
>> +				adjust_managed_page_count(page, -num_pfns);
> num_pfns is of the unsigned int type so need be to converted to long manually.

Oh, the second argument of adjust_managed_page_count is long type. So it 
needs casting as you say.

I'll fix these problems in the v2 patch.

Thank you,