linux-kernel - Re: [PATCH 2/4] perf tools: Do the error path hist_entry release in hist_entry_

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Date:	Mon, 4 Jul 2016 16:09:47 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 2/4] perf tools: Do the error path hist_entry release in
 hist_entry__new

Em Mon, Jul 04, 2016 at 04:01:37PM +0200, Jiri Olsa escreveu:
> It's better to release the hist_entry object in
> hist_entry__new function (where it's allocated)
> rather than in hist_entry__init.

Please combine this with the previous patch, that way this all gets
clearer :-\

- Arnaldo
 
> Link: http://lkml.kernel.org/n/tip-uoatzgsbdk3ebaeu56kdb9ku@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/hist.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index ed7bea9aa68d..04f3b52a319c 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -360,10 +360,8 @@ static int hist_entry__init(struct hist_entry *he,
>  
>  	if (symbol_conf.cumulate_callchain) {
>  		he->stat_acc = malloc(sizeof(he->stat));
> -		if (he->stat_acc == NULL) {
> -			free(he);
> +		if (he->stat_acc == NULL)
>  			return -ENOMEM;
> -		}
>  		memcpy(he->stat_acc, &he->stat, sizeof(he->stat));
>  		if (!sample_self)
>  			memset(&he->stat, 0, sizeof(he->stat));
> @@ -381,7 +379,6 @@ static int hist_entry__init(struct hist_entry *he,
>  		if (he->branch_info == NULL) {
>  			map__zput(he->ms.map);
>  			free(he->stat_acc);
> -			free(he);
>  			return -ENOMEM;
>  		}
>  
> @@ -415,7 +412,6 @@ static int hist_entry__init(struct hist_entry *he,
>  				map__put(he->mem_info->daddr.map);
>  			}
>  			free(he->stat_acc);
> -			free(he);
>  			return -ENOMEM;
>  		}
>  	}
> @@ -439,10 +435,13 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
>  		callchain_size = sizeof(struct callchain_root);
>  
>  	he = zalloc(sizeof(*he) + callchain_size);
> -	if (he)
> +	if (he) {
>  		err = hist_entry__init(he, template, sample_self);
> +		if (err)
> +			zfree(&he);
> +	}
>  
> -	return err ? NULL : he;
> +	return he;
>  }
>  
>  static u8 symbol__parent_filter(const struct symbol *parent)
> -- 
> 2.4.11