linux-kernel - Re: [PATCH 2/5] tools lib api fs: Add tracefs mount helper functions

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Date:	Sun, 25 Jan 2015 17:51:14 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 2/5] tools lib api fs: Add tracefs mount helper functions

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
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