linux-kernel - Re: [PATCH v1 1/6] perf pmu: Directly use evsel's PMU pointer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3c25ed2b-9538-4d10-9152-ed1e6106b41a@intel.com>
Date: Mon, 22 Jul 2024 13:40:56 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Leo Yan <leo.yan@....com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
 James Clark <james.clark@...aro.org>,
 Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach
 <mike.leach@...aro.org>, John Garry <john.g.garry@...cle.com>,
 Will Deacon <will@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
 Mark Rutland <mark.rutland@....com>, coresight@...ts.linaro.org,
 linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/6] perf pmu: Directly use evsel's PMU pointer

On 21/07/24 23:21, Leo Yan wrote:
> Rather than iterating the whole PMU list for finding the associated PMU
> device for an evsel, this commit optimizes to directly use evsel's 'pmu'
> pointer for accessing PMU device.
> 
> Signed-off-by: Leo Yan <leo.yan@....com>
> ---
>  tools/perf/util/pmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 986166bc7c78..798cd5a2ebc4 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -1199,7 +1199,7 @@ void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
>  
>  bool evsel__is_aux_event(const struct evsel *evsel)
>  {
> -	struct perf_pmu *pmu = evsel__find_pmu(evsel);
> +	struct perf_pmu *pmu = evsel->pmu;

Assumes event parser has populated evsel->pmu for auxtrace events.
Could use a comment to that effect.

>  
>  	return pmu && pmu->auxtrace;
>  }