From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753935AbbAYQv0 (ORCPT <rfc822;w@1wt.eu>);
	Sun, 25 Jan 2015 11:51:26 -0500
Received: from mx1.redhat.com ([209.132.183.28]:50270 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1753232AbbAYQvY (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Sun, 25 Jan 2015 11:51:24 -0500
Date: Sun, 25 Jan 2015 17:51:14 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jiri Olsa <jolsa@kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH 2/5] tools lib api fs: Add tracefs mount helper functions
Message-ID: <20150125165114.GE31987@krava.brq.redhat.com>
References: <20150124181330.195149364@goodmis.org>
 <20150124181448.680347393@goodmis.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150124181448.680347393@goodmis.org>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sat, Jan 24, 2015 at 01:13:32PM -0500, Steven Rostedt wrote:

SNIP

> +static const char * const tracefs_known_mountpoints[] = {
> +	TRACEFS_DEFAULT_PATH,
> +	"/sys/kernel/debug/tracing",
> +	"/tracing",
> +	"/trace",
> +	0,
> +};
> +
> +static bool tracefs_found;
> +
> +/* find the path to the mounted tracefs */
> +const char *tracefs_find_mountpoint(void)
> +{
> +	if (tracefs_found)
> +		return (const char *)tracefs_mountpoint;
> +
> +	return find_mountpoint("tracefs", (long) TRACEFS_MAGIC,
> +			       tracefs_mountpoint, PATH_MAX + 1,
> +			       tracefs_known_mountpoints);
> +}

also tracefs_found is not set 'true' in case we succeed..

jirka