linux-kernel - Re: [PATCH v3] perf expr: Fix return value of ids_

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Date:   Tue, 21 Dec 2021 09:29:40 +0100
From:   Jiri Olsa <jolsa@...hat.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>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        German Gomez <german.gomez@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf expr: Fix return value of ids__new

On Tue, Dec 14, 2021 at 01:10:27AM +0000, 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.
> 
> ---
> Changes in v3:
> fix compilation error and add tags.

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> Tested-by: German Gomez <german.gomez@....com>
> Reviewed-by: German Gomez <german.gomez@....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..f225247acc01 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -12,6 +12,7 @@
>  #include "expr-bison.h"
>  #include "expr-flex.h"
>  #include "smt.h"
> +#include <linux/err.h>
>  #include <linux/kernel.h>
>  #include <linux/zalloc.h>
>  #include <ctype.h>
> @@ -65,7 +66,12 @@ 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;
> +	return hash;
>  }
>  
>  void ids__free(struct hashmap *ids)
> -- 
> 2.17.1
>