linux-kernel - Re: [PATCH v2 4/4] tracing/kprobes: Turn trace_probe->files into list

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Date:	Mon, 01 Jul 2013 15:08:41 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] tracing/kprobes: Turn trace_probe->files into
 list_head

On Thu, 2013-06-20 at 19:38 +0200, Oleg Nesterov wrote:

> -static int
> -trace_probe_file_index(struct trace_probe *tp, struct ftrace_event_file *file)
> +static struct event_file_link *
> +find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file)
>  {
> -	struct ftrace_event_file **files;
> -	int i;
> +	struct event_file_link *link;
>  
> -	/*
> -	 * Since all tp->files updater is protected by probe_enable_lock,
> -	 * we don't need to lock an rcu_read_lock.
> -	 */
> -	files = rcu_dereference_raw(tp->files);
> -	if (files) {
> -		for (i = 0; files[i]; i++)
> -			if (files[i] == file)
> -				return i;
> -	}
> +	list_for_each_entry(link, &tp->files, list)
> +		if (link->file == file)
> +			return link;

Shouldn't that be list_for_each_entry_rcu()?

-- Steve

>  
> -	return -1;
> +	return NULL;
>  }
>  
>  /*


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