linux-kernel - Re: [PATCH] perf symbols: Fix reading build id

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Message-ID: <20160721075302.GA7651@krava>
Date:	Thu, 21 Jul 2016 09:53:02 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	Uwe Kleine-König <uwe@...ine-koenig.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, Jiri Olsa <jolsa@...nel.org>,
	kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf symbols: Fix reading build id

On Thu, Jul 21, 2016 at 09:21:55AM +0200, Marc Kleine-Budde wrote:
> On 07/21/2016 09:09 AM, Uwe Kleine-König wrote:
> > From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > 
> > When is_regular_file(name) is called name points to a freshly allocated
> > and uninitialized chunk of memory, so is_regular_file(name) is usually
> > false and reading build id is skipped which makes it impossible to
> > find debug infos when a build id based system is in use.
> > 
> > Fixes: 403567217d3f ("perf symbols: Do not read symbols/data from device files")
> > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> See https://patchwork.kernel.org/patch/9196777/

Arnaldo, could you please pull this one in?

thanks,
jirka

> 
> Marc
> 
> > ---
> >  tools/perf/util/symbol.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> > index 54c4ff2b1cee..7044742c828f 100644
> > --- a/tools/perf/util/symbol.c
> > +++ b/tools/perf/util/symbol.c
> > @@ -1430,7 +1430,7 @@ int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
> >  	 * Read the build id if possible. This is required for
> >  	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
> >  	 */
> > -	if (is_regular_file(name) &&
> > +	if (is_regular_file(dso->long_name) &&
> >  	    filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) > 0)
> >  		dso__set_build_id(dso, build_id);
> >  
> > 
> 
> 
> -- 
> Pengutronix e.K.                  | Marc Kleine-Budde           |
> Industrial Linux Solutions        | Phone: +49-231-2826-924     |
> Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
> Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |
>