3561 	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu);  in trace_iterator_increment()  local
3564 	if (buf_iter)  in trace_iterator_increment()
3565 		ring_buffer_iter_advance(buf_iter);  in trace_iterator_increment()
3573 	struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu);  in peek_next_entry()  local
3575 	if (buf_iter) {  in peek_next_entry()
3576 		event = ring_buffer_iter_peek(buf_iter, ts);  in peek_next_entry()
3578 			*lost_events = ring_buffer_iter_dropped(buf_iter) ?  in peek_next_entry()
4050 	struct ring_buffer_iter *buf_iter;  in tracing_iter_reset()  local
4056 	buf_iter = trace_buffer_iter(iter, cpu);  in tracing_iter_reset()
4057 	if (!buf_iter)  in tracing_iter_reset()
4060 	ring_buffer_iter_reset(buf_iter);  in tracing_iter_reset()
4067 	while (ring_buffer_iter_peek(buf_iter, &ts)) {  in tracing_iter_reset()
4071 		ring_buffer_iter_advance(buf_iter);  in tracing_iter_reset()
4478 	struct ring_buffer_iter *buf_iter;  in trace_empty()  local
4484 		buf_iter = trace_buffer_iter(iter, cpu);  in trace_empty()
4485 		if (buf_iter) {  in trace_empty()
4486 			if (!ring_buffer_iter_empty(buf_iter))  in trace_empty()
4496 		buf_iter = trace_buffer_iter(iter, cpu);  in trace_empty()
4497 		if (buf_iter) {  in trace_empty()
4498 			if (!ring_buffer_iter_empty(buf_iter))  in trace_empty()