drm/gem: add functions for mmap offset creation

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 9b7c2bb..43538b6 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1624,6 +1624,9 @@
 	drm_gem_object_unreference_unlocked(obj);
 }
 
+void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
+int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
+
 struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
 					     struct drm_file *filp,
 					     u32 handle);