linux-kernel - Re: [PATCH] perf probe: Use dwarf_getcfi_elf() instead of dwarf

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Date:	Tue, 08 Apr 2014 08:48:23 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

(2014/04/07 16:05), Namhyung Kim wrote:
> The dwarf_getcfi() only checks .debug_frame section for CFI, but as
> most binaries only have .eh_frame it'd return NULL and it makes
> some variables inaccessible.
> 
> Using dwarf_getcfi_elf (along with dwarf_getelf()) allows to show and
> add probe to more variables.
> 
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Thank you for fixing :)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

> ---
>  tools/perf/util/probe-finder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 3bf0c8cdccb7..d58da0672736 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -985,7 +985,7 @@ static int debuginfo__find_probes(struct debuginfo *dbg,
>  
>  #if _ELFUTILS_PREREQ(0, 142)
>  	/* Get the call frame information from this dwarf */
> -	pf->cfi = dwarf_getcfi(dbg->dbg);
> +	pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg));
>  #endif
>  
>  	off = 0;
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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