linux-kernel - Re: PATCH? trace_remove_event_call() should fail if call is active

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Date:	Tue, 02 Jul 2013 18:53:50 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: PATCH? trace_remove_event_call() should fail if call is active

On Wed, 2013-07-03 at 00:23 +0200, Oleg Nesterov wrote:

>  /* Remove an event_call */
> -void trace_remove_event_call(struct ftrace_event_call *call)
> +int trace_remove_event_call(struct ftrace_event_call *call)
>  {
> +	int err;
> +
>  	mutex_lock(&event_mutex);
>  	down_write(&trace_event_sem);

Oh, BTW, can you rebase this on top of my for-next branch. That's what
I'll be pushing off to Linus, and this will conflict with those changes.

-- Steve

 git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git


> -	__trace_remove_event_call(call);
> +	err = event_can_remove(call);
> +	if (!err)
> +		__trace_remove_event_call(call);
>  	up_write(&trace_event_sem);
>  	mutex_unlock(&event_mutex);
> +
> +	return err;
>  }
>  
>  #define for_each_event(event, start, end)			\


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