linux-kernel - Re: [PATCH V7 24/24] perf tools: adding coresight etm PMU record capabilities

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Date:	Wed, 23 Dec 2015 09:46:29 -0700
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Rabin Vincent <rabin@....in>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Chunyan Zhang <zhang.chunyan@...aro.org>,
	Mike Leach <mike.leach@....com>,
	"Jeremiassen, Tor" <tor@...com>, Al Grant <al.grant@....com>,
	fainelli@...adcom.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH V7 24/24] perf tools: adding coresight etm PMU record capabilities

On 19 December 2015 at 10:27, Rabin Vincent <rabin@....in> wrote:
> On Fri, Dec 18, 2015 at 01:59:20PM -0700, Mathieu Poirier wrote:
>> +struct auxtrace_record
>> +*auxtrace_record__init(struct perf_evlist *evlist, int *err)
>> +{
>> +     struct perf_pmu *cs_etm_pmu;
>> +     struct perf_evsel *evsel;
>> +     bool found_etm = false;
>> +
>> +     cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
>> +
>> +      if (evlist) {
>> +             evlist__for_each(evlist, evsel) {
>> +                     if (cs_etm_pmu &&
>> +                         evsel->attr.type == cs_etm_pmu->type)
>> +                             found_etm = true;
>> +             }
>> +     }
>> +
>> +     if (found_etm)
>> +             return cs_etm_record_init(err);
>> +
>> +     *err = -EINVAL;
>
> This should not set an error code when found_etm is false.  Otherwise
> any attempt to uses perf record without a cs_etm event enabled errors
> out.

Yes, you're right.

Many thanks for the thorough review,
Mathieu

>
>> +     return NULL;
>> +}
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