linux-kernel - Re: [PATCH 5/7] tracing/uprobes: kill the dead TRACE_EVENT_FL_USE_CALL

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Date:	Mon, 14 Jul 2014 15:04:25 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] tracing/uprobes: kill the dead
 TRACE_EVENT_FL_USE_CALL_FILTER logic

On Fri, 11 Jul 2014 21:06:50 +0200
Oleg Nesterov <oleg@...hat.com> wrote:

> alloc_trace_uprobe() sets TRACE_EVENT_FL_USE_CALL_FILTER for unknown
> reason and this is simply wrong. 

The reason is not unknown. The reason is "cut and paste".

-- Steve

> Fortunately this has no effect because
> register_uprobe_event() clears call->flags after that.
> 
> Kill both. This trace_uprobe was kzalloc'ed and we realy on this fact
> anyway.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/trace/trace_uprobe.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 3c9b97e..33ff6a2 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -265,7 +265,6 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
>  	if (is_ret)
>  		tu->consumer.ret_handler = uretprobe_dispatcher;
>  	init_trace_uprobe_filter(&tu->filter);
> -	tu->tp.call.flags |= TRACE_EVENT_FL_USE_CALL_FILTER;
>  	return tu;
>  
>  error:
> @@ -1292,7 +1291,7 @@ static int register_uprobe_event(struct trace_uprobe *tu)
>  		kfree(call->print_fmt);
>  		return -ENODEV;
>  	}
> -	call->flags = 0;
> +
>  	call->class->reg = trace_uprobe_register;
>  	call->data = tu;
>  	ret = trace_add_event_call(call);

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