tracing_resize_ring_buffer
ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode));
tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS);
extern ssize_t tracing_resize_ring_buffer(struct trace_array *tr,
tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0)