void ring_buffer_nest_start(struct trace_buffer *buffer)
{
	struct ring_buffer_per_cpu *cpu_buffer;
	int cpu;

	/* Enabled by ring_buffer_nest_end() */
	preempt_disable_notrace();
	cpu = raw_smp_processor_id();
	cpu_buffer = buffer->buffers[cpu];
	/* This is the shift value for the above recursive locking */
	cpu_buffer->nest += NESTED_BITS;
}
void ring_buffer_nest_start(struct trace_buffer *buffer)
{
	struct ring_buffer_per_cpu *cpu_buffer;
	int cpu;

	 
	preempt_disable_notrace();
	cpu = raw_smp_processor_id();
	cpu_buffer = buffer->buffers[cpu];
	 
	cpu_buffer->nest += NESTED_BITS;
}