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virtio_balloon: fix shrinker count

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Instead of multiplying by page order, virtio balloon divided by page
order. The result is that it can return 0 if there are a bit less
than MAX_ORDER - 1 pages in use, and then shrinker scan won't be called.

Cc: stable@vger.kernel.org
Fixes: 71994620bb25 ("virtio_balloon: replace oom notifier with shrinker")
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Wei Wang 2019-11-19 05:02:33 -05:00 committed by Michael S. Tsirkin
parent 60bd04f258
commit c9a6820fc0
1 changed files with 1 additions and 1 deletions
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2
drivers/virtio/virtio_balloon.c
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@ -826,7 +826,7 @@ static unsigned long virtio_balloon_shrinker_count(struct shrinker *shrinker,
unsigned long count;
count = vb->num_pages / VIRTIO_BALLOON_PAGES_PER_PAGE;
count += vb->num_free_page_blocks >> VIRTIO_BALLOON_FREE_PAGE_ORDER;
count += vb->num_free_page_blocks << VIRTIO_BALLOON_FREE_PAGE_ORDER;
return count;
}