linux-kernel - Re: [PATCH] perf: python: Reference Py

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Date:   Thu, 22 Mar 2018 10:14:48 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Petr Machata <petrm@...lanox.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] perf: python: Reference Py_None before returning it

On Thu, Mar 22, 2018 at 12:57:32AM +0100, Petr Machata wrote:
> Python None objects are handled just like all the other objects with
> respect to their reference counting. Before returning Py_None, its
> reference count thus needs to be bumped.
> 
> Signed-off-by: Petr Machata <petrm@...lanox.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/util/python.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> index b1e999b..762d429 100644
> --- a/tools/perf/util/python.c
> +++ b/tools/perf/util/python.c
> @@ -967,8 +967,10 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
>  			return PyErr_NoMemory();
>  
>  		evsel = perf_evlist__event2evsel(evlist, event);
> -		if (!evsel)
> +		if (!evsel) {
> +			Py_INCREF(Py_None);
>  			return Py_None;
> +		}
>  
>  		pevent->evsel = evsel;
>  
> -- 
> 2.4.3
>