trace_buffer_iter
if (trace_buffer_iter(iter, iter->cpu_file))
struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu);
struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu);
buf_iter = trace_buffer_iter(iter, cpu);
buf_iter = trace_buffer_iter(iter, cpu);
buf_iter = trace_buffer_iter(iter, cpu);
if (trace_buffer_iter(iter, iter->cpu_file))
ring_iter = trace_buffer_iter(iter, iter->cpu);