virtio: avoid implicit use of Linux page size in balloon interface - fixes Use tabs to indent, and put BUILD_BUG_ON pagesize assumption. Signed-off-by: Rusty Russell --- drivers/virtio/virtio_balloon.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff -r 50e970613233 drivers/virtio/virtio_balloon.c --- a/drivers/virtio/virtio_balloon.c Fri Nov 14 11:40:38 2008 +1030 +++ b/drivers/virtio/virtio_balloon.c Fri Nov 14 11:41:19 2008 +1030 @@ -58,10 +58,11 @@ static u32 page_to_balloon_pfn(struct page *page) { - unsigned long pfn = page_to_pfn(page); + unsigned long pfn = page_to_pfn(page); - /* Convert pfn from Linux page size to balloon page size. */ - return pfn >> (PAGE_SHIFT - VIRTIO_BALLOON_PFN_SHIFT); + BUILD_BUG_ON(PAGE_SHIFT < VIRTIO_BALLOON_PFN_SHIFT); + /* Convert pfn from Linux page size to balloon page size. */ + return pfn >> (PAGE_SHIFT - VIRTIO_BALLOON_PFN_SHIFT); } static void balloon_ack(struct virtqueue *vq)