diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 8a099ba1..8b3364e4 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -1169,6 +1169,8 @@ extern int drm_adddraw(struct inode *inode, struct file *filp,
 		       unsigned int cmd, unsigned long arg);
 extern int drm_rmdraw(struct inode *inode, struct file *filp,
 		      unsigned int cmd, unsigned long arg);
+extern int drm_update_drawable_info(struct inode *inode, struct file *filp,
+		       unsigned int cmd, unsigned long arg);
 extern drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev,
 						  drm_drawable_t id);
 
diff --git a/linux-core/drm_drv.c b/linux-core/drm_drv.c
index 89b20a9d..d4ef1306 100644
--- a/linux-core/drm_drv.c
+++ b/linux-core/drm_drv.c
@@ -123,7 +123,9 @@ static drm_ioctl_desc_t drm_ioctls[] = {
 	[DRM_IOCTL_NR(DRM_IOCTL_TTM)] = {drm_ttm_ioctl, DRM_AUTH},
 	[DRM_IOCTL_NR(DRM_IOCTL_BUFOBJ)] = {drm_bo_ioctl, DRM_AUTH},
 	[DRM_IOCTL_NR(DRM_IOCTL_MM_INIT)] = {drm_mm_init_ioctl, 
-					     DRM_AUTH }
+					     DRM_AUTH },
+
+	[DRM_IOCTL_NR(DRM_IOCTL_UPDATE_DRAW)] = {drm_update_drawable_info, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
 };
 
 #define DRIVER_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )