--- src/VBox/Additions/linux/drm/vboxvideo_drm.c.orig	2015-02-22 16:19:39.000000000 +0100
+++ src/VBox/Additions/linux/drm/vboxvideo_drm.c	2015-02-22 16:23:09.000000000 +0100
@@ -126,7 +126,12 @@
         .open = drm_open,
         .release = drm_release,
         .unlocked_ioctl = drm_ioctl,
-        .mmap = drm_mmap,
+# if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
+	 /* This shouldn't be necessary even for old kernels as there is
+	 * nothing sensible to mmap. But we play safe and keep it for
+	 * legacy reasons. */
+	.mmap = drm_mmap,
+# endif
         .poll = drm_poll,
 };
 #endif
@@ -143,6 +148,12 @@
     .get_map_ofs = drm_core_get_map_ofs,
     .get_reg_ofs = drm_core_get_reg_ofs,
 #endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
+    /* If this is missing a warning gets printed to dmesg.  We will not
+     * attempt to make kernels work to which the change (915b4d11b) got back-
+     * ported, as the problem is only cosmetic. */
+    .set_busid = drm_pci_set_busid,
+#endif
 # if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0) && !defined(DRM_FOPS_AS_POINTER)
     .fops =
     {