Re: [PATCH] [v2] linux: virtio: Standardize virtio's concept of "page size"

[Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>]

On Friday 14 November 2008 08:18:33 Hollis Blanchard wrote:
> On Thu, 2008-11-13 at 08:44 +1030, Rusty Russell wrote:
> > Note that I still don't have a balloon patch: want to send me one?
>
> linux: virtio-balloon: avoid implicit use of Linux page size in balloon
> interface

Thanks, applied with following diff:

Use tabs to indent, and put BUILD_BUG_ON pagesize assumption.

Signed-off-by: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>

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)

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