linux-kernel - Re: [PATCH] perf probe: Fix --line option behavior

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Date:	Tue, 01 Apr 2014 14:01:45 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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: Fix --line option behavior

(2014/04/01 13:47), Namhyung Kim wrote:
> The commit 5a62257a3ddd1 ("perf probe: Replace line_list with
> intlist") replaced line_list to intlist but it has a problem that if a
> same line was added again, it'd return -EEXIST rather than 1.

Ah, right! that's a different behavior.

> Since line_range_walk_cb() only checks the result being negative, it
> resulted in failure or segfault sometimes.

Could you give me an example input of the segfault? I'd like to trace
it down.

> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

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

Thank you very much!

> ---
>  tools/perf/util/probe-finder.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index df0238654698..3bf0c8cdccb7 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -1441,13 +1441,15 @@ static int line_range_walk_cb(const char *fname, int lineno,
>  			      void *data)
>  {
>  	struct line_finder *lf = data;
> +	int err;
>  
>  	if ((strtailcmp(fname, lf->fname) != 0) ||
>  	    (lf->lno_s > lineno || lf->lno_e < lineno))
>  		return 0;
>  
> -	if (line_range_add_line(fname, lineno, lf->lr) < 0)
> -		return -EINVAL;
> +	err = line_range_add_line(fname, lineno, lf->lr);
> +	if (err < 0 && err != -EEXIST)
> +		return err;
>  
>  	return 0;
>  }
> 


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


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