vb2_v4l2_qbuf      12 drivers/media/v4l2-core/v4l2-trace.c EXPORT_TRACEPOINT_SYMBOL_GPL(vb2_v4l2_qbuf);
vb2_v4l2_qbuf     260 include/trace/events/v4l2.h DEFINE_EVENT(vb2_v4l2_event_class, vb2_v4l2_qbuf,