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From:   Atish Patra <atishp@atishpatra.org>
Date:   Thu, 15 Jun 2023 01:24:40 -0700
Message-ID: <CAOnJCU+rhbFY6DaA508E6KFaa4VoEWiHOFpZnsjiqTwEdTVGEg@mail.gmail.com>
Subject: Re: [PATCH v2 01/10] perf: Fix wrong comment about default event_idx
To:     Alexandre Ghiti <alex@ghiti.fr>
Cc:     Andrew Jones <ajones@ventanamicro.com>,
        Alexandre Ghiti <alexghiti@rivosinc.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Ian Rogers <irogers@google.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Anup Patel <anup@brainfault.org>,
        Will Deacon <will@kernel.org>, Rob Herring <robh@kernel.org>,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
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On Thu, Jun 15, 2023 at 12:10=E2=80=AFAM Alexandre Ghiti <alex@ghiti.fr> wr=
ote:
>
>
> On 31/05/2023 15:54, Andrew Jones wrote:
> > On Fri, May 12, 2023 at 10:53:12AM +0200, Alexandre Ghiti wrote:
> >> event_idx default implementation returns 0, not idx + 1.
> > The comment was correct until commit c719f56092ad ("perf: Fix and clean
> > up initialization of pmu::event_idx"). I'm not sure that warrants a fix=
es
> > tag, but maybe a reference in the commit message.
>
>
> You're right, I'll add a reference, I don't think it deserves a
> backport, that's just a comment.
>
>

With that done:

Reviewed-by: Atish Patra <atishp@rivosinc.com>

> >> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> >> ---
> >>   include/linux/perf_event.h | 3 ++-
> >>   1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> >> index d5628a7b5eaa..56fe43b20966 100644
> >> --- a/include/linux/perf_event.h
> >> +++ b/include/linux/perf_event.h
> >> @@ -442,7 +442,8 @@ struct pmu {
> >>
> >>      /*
> >>       * Will return the value for perf_event_mmap_page::index for this=
 event,
> >> -     * if no implementation is provided it will default to: event->hw=
.idx + 1.
> >> +     * if no implementation is provided it will default to 0 (see
> >> +     * perf_event_idx_default).
> >>       */
> >>      int (*event_idx)                (struct perf_event *event); /*opt=
ional */
> >>
> >> --
> >> 2.37.2
> >>
> > Otherwise,
> >
> > Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
>
>
> Thanks!
>


--=20
Regards,
Atish