Re: [Patch 1/3] Tracing/ftrace: Make nop tracer reset previous entries

[KOSAKI Motohiro]

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> If nop tracer is selected, some old entries from the previous tracer could still be enqueued. Tracing have to be reset.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> ---
> diff -rup linux-2.6-tip (2)/kernel/trace/trace_nop.c linux-2.6-tip/kernel/trace/trace_nop.c
> --- linux-2.6-tip (2)/kernel/trace/trace_nop.c	2008-09-19 18:01:26.000000000 +0200
> +++ linux-2.6-tip/kernel/trace/trace_nop.c	2008-09-21 00:44:47.000000000 +0200
> @@ -25,8 +25,12 @@ static void stop_nop_trace(struct trace_
>  }
> 
>  
> 
>  static void nop_trace_init(struct trace_array *tr)
> 
> -{
> 
> -	ctx_trace = tr;
> 
> +{
> +	int cpu;
> 
> +	ctx_trace = tr;
> +
> +	for_each_online_cpu(cpu)
> 
> +		tracing_reset(tr->data[cpu]);
> 
>  
> 
>  	if (tr->ctrl)
> 
>  		start_nop_trace(tr);
> --
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