Jeff Garzik wrote:

quoted

 static void uml_net_set_multicast_list(struct net_device *dev)
 {
-    if (dev->flags & IFF_PROMISC)
-        return;
-    else if (dev->mc_count)
-        dev->flags |= IFF_ALLMULTI;
-    else dev->flags &= ~IFF_ALLMULTI;
+    return;
 }

Might as well just delete the hook at that point...

I kept it so SIOCADDMULTI/SIOCDELMULTI ioctls continue to
work on UML devices. I don't know if any userspace applications
check for errors when using these ioctls, this way nothing
can break.