Message-ID: <1368112306.7373.106.camel@gandalf.local.home>
Subject: Re: [PATCH 01/11] [BUGFIX] tracing: Return 0 if event_enable_func
 succeeded
From: Steven Rostedt <rostedt@goodmis.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: linux-kernel@vger.kernel.org,
        Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        yrl.pp-manager.tt@hitachi.com, Oleg Nesterov <oleg@redhat.com>,
        Ingo Molnar <mingo@redhat.com>, Tom Zanussi <tom.zanussi@intel.com>
Date: Thu, 09 May 2013 11:11:46 -0400
In-Reply-To: <1368109905.7373.99.camel@gandalf.local.home>
References: <20130509054405.30398.73831.stgit@mhiramat-M0-7522>
	 <20130509054413.30398.55650.stgit@mhiramat-M0-7522>
	 <1368109905.7373.99.camel@gandalf.local.home>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1238
Lines: 44

On Thu, 2013-05-09 at 10:31 -0400, Steven Rostedt wrote:

> > diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> > index 53582e9..44ac836 100644
> > --- a/kernel/trace/trace_events.c
> > +++ b/kernel/trace/trace_events.c
> > @@ -2061,8 +2061,11 @@ event_enable_func(struct ftrace_hash *hash,
> >  	if (ret < 0)
> >  		goto out_put;
> >  	ret = register_ftrace_function_probe(glob, ops, data);
> > -	if (!ret)
> > +	if (!ret) {
> > +		ret = -ENOENT;
> >  		goto out_disable;
> > +	} else
> > +		ret = 0;
> 
> I think you meant:
> 
> 	if (ret < 0)
> 		goto out_disable;
> 	ret = 0;
> 
> Otherwise, I don't see how you fixed anything, as you still return error
> if ret is something other than zero.
> 
> Or am I missing something?

Yeah, this needs a comment.  register_ftrace_function_probe() returns
the number of functions enabled, but if that is zero (or less), then it
should fail. We still need to check for less than ret.

I'll fix this one up.

Thanks!

-- Steve


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/