From: "Michael S. Tsirkin" <m...@redhat.com>

[ Upstream commit 6e9826e77249355c09db6ba41cd3f84e89f4b614 ]

Make sure, at build time, that pfn array is big enough to hold a single
page.  It happens to be true since the PAGE_SHIFT value at the moment is
20, which is 1M - exactly 256 4K balloon pages.

Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Reviewed-by: David Hildenbrand <da...@redhat.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/virtio/virtio_balloon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index c962d9b370c69..d2c4eb9efd70b 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -157,6 +157,8 @@ static void set_page_pfns(struct virtio_balloon *vb,
 {
        unsigned int i;
 
+       BUILD_BUG_ON(VIRTIO_BALLOON_PAGES_PER_PAGE > 
VIRTIO_BALLOON_ARRAY_PFNS_MAX);
+
        /*
         * Set balloon pfns pointing at this page.
         * Note that the first pfn points at start of the page.
-- 
2.20.1

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