linux-kernel - Re: [PATCH v3 7/8] perf: Add perf_event

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Message-ID: <877czfujdj.fsf@ubik.fi.intel.com>
Date:   Mon, 28 Nov 2022 18:35:52 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>, Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        kvmarm@...ts.linux.dev, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, James Clark <james.clark@....com>,
        Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        alexander.shishkin@...ux.intel.com
Subject: Re: [PATCH v3 7/8] perf: Add perf_event_attr::config3

Rob Herring <robh@...nel.org> writes:

> On Fri, Nov 18, 2022 at 10:49 AM Will Deacon <will@...nel.org> wrote:
>>
>> On Fri, Nov 04, 2022 at 10:55:07AM -0500, Rob Herring wrote:
>> > @@ -515,6 +516,8 @@ struct perf_event_attr {
>> >        * truncated accordingly on 32 bit architectures.
>> >        */
>> >       __u64   sig_data;
>> > +
>> > +     __u64   config3; /* extension of config2 */
>>
>> I need an ack from the perf core maintainers before I can take this.
>
> Peter, Arnaldo, Ingo,
>
> Can I get an ack on this please.

It appears that PMUs that don't use config{1,2} and now config3 allow
them to be whatever without any validation, whereas in reality we should
probably -EINVAL in those cases. Should something be done about that?

Regards,
--
Alex