ring_buffer_max_event_size
unsigned long ring_buffer_max_event_size(struct trace_buffer *buffer);
EXPORT_SYMBOL_GPL(ring_buffer_max_event_size);
if (size > ring_buffer_max_event_size(buffer)) {
cnt = ring_buffer_max_event_size(buffer) - meta_size;
if (size > ring_buffer_max_event_size(buffer))