linux-kernel - Re: [PATCH 15/17] tools lib traceevent: Unregister handler when jbd2 plugin unloaded

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Date:	Wed, 15 Jan 2014 15:35:58 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 15/17] tools lib traceevent: Unregister handler when
 jbd2 plugin unloaded

On Wed, 15 Jan 2014 10:45:38 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> The function handlers should be unregistered when the plugin unloaded
> otherwise they'll try to access invalid memory.
> 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/lib/traceevent/plugin_jbd2.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/tools/lib/traceevent/plugin_jbd2.c b/tools/lib/traceevent/plugin_jbd2.c
> index 2f93f81f0bac..88fe6fe872d5 100644
> --- a/tools/lib/traceevent/plugin_jbd2.c
> +++ b/tools/lib/traceevent/plugin_jbd2.c
> @@ -66,3 +66,14 @@ int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
>  				       PEVENT_FUNC_ARG_VOID);
>  	return 0;
>  }
> +
> +void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
> +{
> +	pevent_unregister_print_function(pevent,
> +					 process_jbd2_dev_to_name,
> +					 "jbd2_dev_to_name");
> +
> +	pevent_unregister_print_function(pevent,
> +					 process_jiffies_to_msecs,
> +					 "jiffies_to_msecs");
> +}

Same here. I don't know about others, but I think it looks a bit nicer
if we move the function up to the first line.

-- Steve

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