linux-kernel - Re: [PATCH 09/11] tools lib traceevent: Add alias field to struct format

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Date:	Wed, 25 Feb 2015 00:12:31 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org,
	Wang Nan <wangnan0@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH 09/11] tools lib traceevent: Add alias field to struct
 format_field

On Tue, Feb 24, 2015 at 05:54:58PM -0500, Steven Rostedt wrote:
> On Fri, Feb 20, 2015 at 11:17:06PM +0100, Jiri Olsa wrote:
> > ---
> >  tools/lib/traceevent/event-parse.c | 1 +
> >  tools/lib/traceevent/event-parse.h | 1 +
> >  2 files changed, 2 insertions(+)
> > 
> > diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> > index afe20ed9fac8..b35664cc1edc 100644
> > --- a/tools/lib/traceevent/event-parse.c
> > +++ b/tools/lib/traceevent/event-parse.c
> > @@ -6236,6 +6236,7 @@ static void free_format_fields(struct format_field *field)
> >  		next = field->next;
> >  		free(field->type);
> >  		free(field->name);
> > +		free(field->alias);
> 
> Hmm, didn't we say that if there's no need for the alias that the alias will
> simply be a pointer to name? If that's the case we need:
> 
> 	if (field->alias != field->name)
> 		free(field->alias);
> 	free(field->name);
> 
> Otherwise it will be a double free.

i used it separately.. like if there's no alias it's set to NULL,
but I'll add the logic you described and repost, it seems ok

jirka
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