linux-kernel - Re: [PATCH] perf expr: Fix return value of ids_

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Date:   Mon, 13 Dec 2021 13:57:46 +0000
From:   German Gomez <german.gomez@....com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf expr: Fix return value of ids__new

This message appeared in my client as a separate thread, but it seems to
be a reply to a message from a different thread:

"In-Reply-To: <864ad02d-6afe-791c-f742-56582b633482@....com>"

On 13/12/2021 07:09, Miaoqian Lin wrote:
> callers of ids__new() function only do NULL checking for the return
> value. ids__new() calles hashmap__new(), which may return
> ERR_PTR(-ENOMEM). Instead of changing the checking one-by-one.
> return NULL instead of ERR_PTR(-ENOMEM) to keep
> consistent.
>
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>  tools/perf/util/expr.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 1d532b9fed29..aabdc112300c 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -65,7 +65,13 @@ static bool key_equal(const void *key1, const void *key2,
>  
>  struct hashmap *ids__new(void)
>  {
> -	return hashmap__new(key_hash, key_equal, NULL);
> +	struct hashmap *hash;
> +
> +	hash = hashmap__new(key_hash, key_equal, NULL);
> +	if (IS_ERR(hash))
> +		return NULL;
> +	else
> +		return hash;
>  }
>  
>  void ids__free(struct hashmap *ids)