Re: [PATCH 1/6] ftrace: move function tracer functions out oftrace.c

[Andrew Morton]

On Thu, 15 Jan 2009 23:53:43 -0500 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

>  static void
> +function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
> +{
> +	struct trace_array *tr = func_trace;
> +	struct trace_array_cpu *data;
> +	unsigned long flags;
> +	long disabled;
> +	int cpu, resched;
> +	int pc;
> +
> +	if (unlikely(!ftrace_function_enabled))
> +		return;

We're optimizing for the tracing-is-enabled case.  What's the thinking
here?
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