virtio: use LGUEST_VRING_ALIGN instead of relying on pagesize

This doesn't really matter, since lguest is i386 only at the moment,
but we could actually choose a different value.  (lguest doesn't have
a guarenteed ABI).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 3 deletions

diff --git a/Documentation/lguest/lguest.c b/Documentation/lguest/lguest.c
index 804520633fcf..aa2574ca94c7 100644
--- a/Documentation/lguest/lguest.c
+++ b/Documentation/lguest/lguest.c
@@ -1030,7 +1030,7 @@ static void update_device_status(struct device *dev)
                 /* Zero out the virtqueues. */
                 for (vq = dev->vq; vq; vq = vq->next) {
                         memset(vq->vring.desc, 0,
-                               vring_size(vq->config.num, getpagesize()));
+                               vring_size(vq->config.num, LGUEST_VRING_ALIGN));
                         lg_last_avail(vq) = 0;
                 }
         } else if (dev->desc->status & VIRTIO_CONFIG_S_FAILED) {
@@ -1211,7 +1211,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
         void *p;
 
         /* First we need some memory for this virtqueue. */
-        pages = (vring_size(num_descs, getpagesize()) + getpagesize() - 1)
+        pages = (vring_size(num_descs, LGUEST_VRING_ALIGN) + getpagesize() - 1)
                 / getpagesize();
         p = get_pages(pages);
 
@@ -1228,7 +1228,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
         vq->config.pfn = to_guest_phys(p) / getpagesize();
 
         /* Initialize the vring. */
-        vring_init(&vq->vring, num_descs, p, getpagesize());
+        vring_init(&vq->vring, num_descs, p, LGUEST_VRING_ALIGN);
 
         /* Append virtqueue to this device's descriptor.  We use
          * device_config() to get the end of the device's current virtqueues;