ring_buffer_overruns
unsigned long ring_buffer_overruns(struct trace_buffer *buffer);
EXPORT_SYMBOL_GPL(ring_buffer_overruns);
overruns = ring_buffer_overruns(buffer);
if (ring_buffer_overruns(iter->array_buffer->buffer))
if (ring_buffer_overruns(iter->array_buffer->buffer))
unsigned long over = ring_buffer_overruns(iter->array_buffer->buffer);