linux-kernel - Re: [PATCH RESEND v1 05/11] perf mem: Support AUX trace

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Message-ID: <7b0e61d3-3f28-0e98-9c82-b9a9573bf571@arm.com>
Date:   Tue, 1 Sep 2020 16:52:54 +0100
From:   James Clark <james.clark@....com>
To:     Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ian Rogers <irogers@...gle.com>,
        Kemeng Shi <shikemeng@...wei.com>,
        Wei Li <liwei391@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Al Grant <Al.Grant@....com>, linux-kernel@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>
Cc:     nd <nd@....com>
Subject: Re: [PATCH RESEND v1 05/11] perf mem: Support AUX trace

Hi Leo,

>  
> +static int process_attr(struct perf_tool *tool __maybe_unused,
> +			union perf_event *event,
> +			struct evlist **pevlist)
> +{
> +	int err;
> +
> +	err = perf_event__process_attr(tool, event, pevlist);
> +	if (err)
> +		return err;
> +
> +	return 0;
> +}
> +
>  int cmd_mem(int argc, const char **argv)
>  {
>  	struct stat st;
> @@ -405,8 +430,12 @@ int cmd_mem(int argc, const char **argv)
>  			.comm		= perf_event__process_comm,
>  			.lost		= perf_event__process_lost,
>  			.fork		= perf_event__process_fork,
> +			.attr		= process_attr,
>  			.build_id	= perf_event__process_build_id,

I don't understand the __maybe_unused here. And also isn't this equivalent
to this without the new function:

  @@ -405,8 +430,12 @@ int cmd_mem(int argc, const char **argv)
   			.comm		= perf_event__process_comm,
   			.lost		= perf_event__process_lost,
   			.fork		= perf_event__process_fork,
  +			.attr		= perf_event__process_attr,
   			.build_id	= perf_event__process_build_id,


James