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

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Date:	Wed, 21 Jan 2015 17:32:23 -0800
From:	Victor Kamensky <victor.kamensky@...aro.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	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>,
	Will Deacon <will.deacon@....com>,
	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 2/2] perf symbols: debuglink should take symfs option into account

On 21 January 2015 at 16:53, David Ahern <dsahern@...il.com> wrote:
> On 1/21/15 5:34 PM, Victor Kamensky wrote:
>>
>> 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;
>>
>
> I do not see any reason this will not work. Essentially after
> filename__read_debuglink filename contains symfs + dso path + debuglink read
> from .gnu_debuglink section which is what is wanted.

OK, I am good with this. Let me repost the whole
mini-series based on mailing list review comments.

May I use 'Acked-by' (maybe 'Tested-by' as well) with
your name for the shorter (no filename_copy) as above
version of the patch for .gnu_debuglink issue fix.

ARM/Aarch64 specific change also needs update based on
discussion with Will and Russell.

I'll post updated version 2 latter tonight.

Thanks,
Victor

> Thanks for the example. I used it with both a symfs and non-symfs example
> and both times this change worked properly -- the correct hang.debug file is
> read.
>
> Arnaldo?
>
> David
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