linux-kernel - Re: [PATCH] Correctly handle symbols in VDSO

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Message-ID: <20140408154101.GA21094@krava.brq.redhat.com>
Date:	Tue, 8 Apr 2014 17:41:01 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Vladimir Nikulichev <nvs@...icks.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	linux-perf-users@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Correctly handle symbols in VDSO

On Tue, Apr 08, 2014 at 07:24:22PM +0400, Vladimir Nikulichev wrote:
> Hi Namhyung,
> 
> On Apr 7, 2014, at 10:14 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> 
> > Just one question below..
> > 
> >> 
> >> ---------------------------------------------------------------------------------------------------------------------------
> >> 
> >> perf tools: Adjust symbols in VDSO
> >> 
> >> Signed-off-by: Vladimir Nikulichev <nvs@...icks.com>
> >> 
> >> diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
> >> index 3b7dbf5..9c8b23b 100644
> >> --- a/tools/perf/util/symbol-elf.c
> >> +++ b/tools/perf/util/symbol-elf.c
> >> @@ -6,6 +6,7 @@
> >> #include <inttypes.h>
> >> 
> >> #include "symbol.h"
> >> +#include "vdso.h"
> >> #include <symbol/kallsyms.h>
> >> #include "debug.h"
> >> 
> >> @@ -618,6 +619,8 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
> >> 		GElf_Shdr shdr;
> >> 		ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
> >> 				ehdr.e_type == ET_REL ||
> >> +				(dso->symsrc_filename == NULL &&
> > 
> > Is this really needed?  Just checking is_vdso_map() seems to work well
> > for me.  Did you have a specific reason to add it?
> > 
> 
> Nothing specific, just to don't call string operations in most cases. But here it is only a matter of coding style, of course.
> Attaching shorter version of the patch.
> 
> ----------------------------
> 
> perf tools: Adjust symbols in VDSO

hi,
could you please put explanation from first email
into the patch changelog?

cc-ing lkml

thanks,
jirka
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