Clarify that drm_agp_ttm_backend is associated with a drm_ttm.

On first looking at it I assumed it was an aspect of the ttm backend as a
whole rather than specific allocations from a backend.

diff --git a/linux-core/drm_objects.h b/linux-core/drm_objects.h
index 770fbc5..6a90061 100644 (file)
--- a/linux-core/drm_objects.h
+++ b/linux-core/drm_objects.h
@@ -301,7 +301,12 @@ struct drm_ttm_backend_func {
        void (*destroy) (struct drm_ttm_backend *backend);
 };
 
-
+/**
+ * This structure associates a set of flags and methods with a drm_ttm
+ * object, and will also be subclassed by the particular backend.
+ *
+ * \sa #drm_agp_ttm_backend
+ */
 struct drm_ttm_backend {
        struct drm_device *dev;
        uint32_t flags;