linux-kernel - Re: [PATCH v1] perf stat: Fix aggr mode initialization

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Message-ID: <ZPiNBk/m+vcsP+rz@kernel.org>
Date:   Wed, 6 Sep 2023 11:30:30 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf stat: Fix aggr mode initialization

Em Tue, Sep 05, 2023 at 07:58:20PM -0700, Namhyung Kim escreveu:
> On Tue, Sep 5, 2023 at 5:39 PM Ian Rogers <irogers@...gle.com> wrote:
> > The issue was the use of testing a cpumap with NULL rather than using
> > empty, as a map containing the dummy value isn't NULL and the -1
> > results in an empty aggr map being allocated which legitimately
> > overflows when any member is accessed.
> 
> Right, evlist__create_maps() set it to non-NULL.
> 
> >
> > Fixes: 8a96f454f566 ("perf stat: Avoid SEGV if core.cpus isn't set")
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks, applied.

- Arnaldo
 
> Thanks,
> Namhyung