Index: VirtualBox-6.0.8/src/VBox/Additions/linux/drm/vbox_drv.c
===================================================================
--- VirtualBox-6.0.8.orig/src/VBox/Additions/linux/drm/vbox_drv.c
+++ VirtualBox-6.0.8/src/VBox/Additions/linux/drm/vbox_drv.c
@@ -283,11 +283,6 @@ static struct drm_driver driver = {
 	.lastclose = vbox_driver_lastclose,
 	.master_set = vbox_master_set,
 	.master_drop = vbox_master_drop,
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0) || defined(RHEL_73)
-# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0) && !defined(RHEL_75)
-	.set_busid = drm_pci_set_busid,
-# endif
-#endif
 
 	.fops = &vbox_fops,
 	.irq_handler = vbox_irq_handler,
Index: VirtualBox-6.0.8/src/VBox/Additions/linux/drm/vbox_main.c
===================================================================
--- VirtualBox-6.0.8.orig/src/VBox/Additions/linux/drm/vbox_main.c
+++ VirtualBox-6.0.8/src/VBox/Additions/linux/drm/vbox_main.c
@@ -600,13 +600,6 @@ int vbox_dumb_destroy(struct drm_file *f
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0)
-static void ttm_bo_put(struct ttm_buffer_object *bo)
-{
-	ttm_bo_unref(&bo);
-}
-#endif
-
 void vbox_gem_free_object(struct drm_gem_object *obj)
 {
 	struct vbox_bo *vbox_bo = gem_to_vbox_bo(obj);