linux-kernel - Re: [PATCH 3/9 - v2][RFC] tracing: Remove per event trace registering

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Message-ID: <4BE3CD51.4050406@cn.fujitsu.com>
Date:	Fri, 07 May 2010 16:20:33 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 3/9 - v2][RFC] tracing: Remove per event trace registering

> @@ -935,11 +947,11 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
>  		return -1;
>  	}
>  
> -	if (call->regfunc)
> +	if (call->class->probe || call->class->reg)
>  		trace_create_file("enable", 0644, call->dir, call,
>  				  enable);
>  
> -	if (call->id && call->perf_event_enable)
> +	if (call->id && (call->class->perf_probe || call->class->reg))
>  		trace_create_file("id", 0444, call->dir, call,
>  		 		  id);
>  

Accessing of ->perf_probe needs to be guarded with CONFIG_PERF_EVENTS,
otherwise it won't pass compile.

The original code is fine, because ->perf_event_enable is always there
regardless of CONFIG_PERF_EVENTS.
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