linux-kernel - Re: [PATCH V3 2/2] perf symbols: debuglink should take symfs option into account

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Date:	Wed, 28 Jan 2015 20:08:30 -0800
From:	Victor Kamensky <victor.kamensky@...aro.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	David Ahern <dsahern@...il.com>,
	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Avi Kivity <avi@...udius-systems.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Anton Blanchard <anton@...ba.org>,
	Dave Martin <Dave.Martin@....com>,
	open list <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Jiri Olsa <jolsa@...nel.org>, Waiman Long <Waiman.Long@...com>
Subject: Re: [PATCH V3 2/2] perf symbols: debuglink should take symfs option
 into account

Hi  Namhyung,

On 28 January 2015 at 17:38, Namhyung Kim <namhyung@...nel.org> wrote:
> Hi Victor,
>
> On Mon, Jan 26, 2015 at 10:34:02PM -0800, Victor Kamensky wrote:
>> Currently code that tries to read corresponding debug symbol
>> file from .gnu_debuglink section (DSO_BINARY_TYPE__DEBUGLINK)
>> does not take in account symfs option, so filename__read_debuglink
>> function cannot open ELF file, if symfs option is used.
>>
>> Fix is to add proper handling of symfs as it is done in other
>> places: use __symbol__join_symfs function to get real file name
>> of target ELF file.
>>
>> Signed-off-by: Victor Kamensky <victor.kamensky@...aro.org>
>> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
>> Cc: Jiri Olsa <jolsa@...nel.org>
>> Cc: Adrian Hunter <adrian.hunter@...el.com>
>> Cc: Waiman Long <Waiman.Long@...com>
>> Cc: David Ahern <dsahern@...il.com>
>> Acked-and-tested-by: David Ahern <dsahern@...il.com>
>
> Acked-by: Namhyung Kim <namhyung@...nel.org>

Thank you for the Acks! Is there any action items on my side?
Should I repost patches with your Acks? Or you or Arnaldo
will add them once they got merged in proper tree for
upstreaming?

Thanks,
Victor

> Thanks,
> Namhyung
>
>
>> ---
>>  tools/perf/util/dso.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
>> index 45be944..ca8d8d5 100644
>> --- a/tools/perf/util/dso.c
>> +++ b/tools/perf/util/dso.c
>> @@ -45,13 +45,13 @@ int dso__read_binary_type_filename(const struct dso *dso,
>>       case DSO_BINARY_TYPE__DEBUGLINK: {
>>               char *debuglink;
>>
>> -             strncpy(filename, dso->long_name, size);
>> -             debuglink = filename + dso->long_name_len;
>> +             len = __symbol__join_symfs(filename, size, dso->long_name);
>> +             debuglink = filename + len;
>>               while (debuglink != filename && *debuglink != '/')
>>                       debuglink--;
>>               if (*debuglink == '/')
>>                       debuglink++;
>> -             ret = filename__read_debuglink(dso->long_name, debuglink,
>> +             ret = filename__read_debuglink(filename, debuglink,
>>                                              size - (debuglink - filename));
>>               }
>>               break;
>> --
>> 1.9.3
>>
>> --
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