ring_buffer_empty_cpu
bool ring_buffer_empty_cpu(struct trace_buffer *buffer, int cpu);
(cpu != RING_BUFFER_ALL_CPUS && !ring_buffer_empty_cpu(buffer, cpu)))
EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
if (!ring_buffer_empty_cpu(buffer, cpu)) {
if (ring_buffer_empty_cpu(buffer, cpu_file))
if (ring_buffer_empty_cpu(buffer, cpu))
if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu))
if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu))