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References: <20231204182330.654255-1-irogers@google.com> <bea4ad79-297e-9737-8af1-2286192d26f4@os.amperecomputing.com>
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From:   Namhyung Kim <namhyung@kernel.org>
Date:   Mon, 4 Dec 2023 19:33:18 -0800
Message-ID: <CAM9d7ci=Tk845H3x3KMDu-hTdP-u0O6a8D3iAa8EnFLLjOO6OQ@mail.gmail.com>
Subject: Re: [PATCH v1 1/2] perf metrics: Avoid segv if default metricgroup
 isn't set
To:     Ilkka Koskinen <ilkka@os.amperecomputing.com>
Cc:     Ian Rogers <irogers@google.com>,
        John Garry <john.g.garry@oracle.com>,
        Will Deacon <will@kernel.org>,
        James Clark <james.clark@arm.com>,
        Mike Leach <mike.leach@linaro.org>,
        Leo Yan <leo.yan@linaro.org>,
        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>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
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Hello,

On Mon, Dec 4, 2023 at 2:45 PM Ilkka Koskinen
<ilkka@os.amperecomputing.com> wrote:
>
>
>
> On Mon, 4 Dec 2023, Ian Rogers wrote:
> > A metric is default by having "Default" within its groups. The default
> > metricgroup name needn't be set and this can result in segv in
> > default_metricgroup_cmp and perf_stat__print_shadow_stats_metricgroup
> > that assume it has a value when there is a Default metric group. To
> > avoid the segv initialize the value to "".
> >
> > Fixes: 1c0e47956a8e ("perf metrics: Sort the Default metricgroup")
> > Signed-off-by: Ian Rogers <irogers@google.com>
>
> Thanks! I was going to look for the bug but got pulled to other
> tasks. The patch looks good to me and I tested it successfully on
> AmpereOne.
>
>    Reviewed-and-tested-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>

Looks like it needs to go through perf-tools for v6.7.
Ian, do you think this one is enough?

Thanks,
Namhyung