linux-kernel - Re: [PATCH 1/2] tracing/kprobes: move free_trace_probe into unregister_trace

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Date:	Tue, 25 Jun 2013 19:10:17 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [PATCH 1/2] tracing/kprobes: move free_trace_probe into unregister_trace_probe

(2013/06/25 17:15), zhangwei(Jovi) wrote:
> There have no good reason to call free_trace_probe
> every time when unregister_trace_probe return 0.
> 
> Move free_trace_probe into unregister_trace_probe,
> make code simpler.

Sorry, nack. For the symmetrical coding reason, I don't like
involving "free" and "alloc" into "unregister"/"register"
functions. I think those should be just another actions.

Thank you,

> 
> Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/trace/trace_kprobe.c |    5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index 9f46e98..f193c38 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -401,6 +401,7 @@ static int unregister_trace_probe(struct trace_probe *tp)
>  	__unregister_trace_probe(tp);
>  	list_del(&tp->list);
>  	unregister_probe_event(tp);
> +	free_trace_probe(tp);
> 
>  	return 0;
>  }
> @@ -419,7 +420,6 @@ static int register_trace_probe(struct trace_probe *tp)
>  		ret = unregister_trace_probe(old_tp);
>  		if (ret < 0)
>  			goto end;
> -		free_trace_probe(old_tp);
>  	}
> 
>  	/* Register new event */
> @@ -550,8 +550,6 @@ static int create_trace_probe(int argc, char **argv)
>  		}
>  		/* delete an event */
>  		ret = unregister_trace_probe(tp);
> -		if (ret == 0)
> -			free_trace_probe(tp);
>  		mutex_unlock(&probe_lock);
>  		return ret;
>  	}
> @@ -680,7 +678,6 @@ static int release_all_trace_probes(void)
>  	while (!list_empty(&probe_list)) {
>  		tp = list_entry(probe_list.next, struct trace_probe, list);
>  		unregister_trace_probe(tp);
> -		free_trace_probe(tp);
>  	}
> 
>  end:
> 


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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