* Re: [PATCH] perf intel-pt: Fix divide by zero
[not found] <20190301103536.7197-1-adrian.hunter@intel.com>
@ 2019-03-01 17:49 ` Arnaldo Carvalho de Melo
0 siblings, 0 replies; only message in thread
From: Arnaldo Carvalho de Melo @ 2019-03-01 17:49 UTC (permalink / raw)
To: Adrian Hunter; +Cc: Jiri Olsa, Linux Kernel Mailing List, linux-perf-users
Em Fri, Mar 01, 2019 at 12:35:36PM +0200, Adrian Hunter escreveu:
> When tsc is not available, "timeless" decoding is used but a divide by
> zero occurs if perf_time_to_tsc() is called. Ensure the divisor is not
> zero.
Thanks, applied.
- Arnaldo
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> Cc: stable@vger.kernel.org # v4.9+
> ---
> tools/perf/util/intel-pt.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
> index 3b497bab4324..6d288237887b 100644
> --- a/tools/perf/util/intel-pt.c
> +++ b/tools/perf/util/intel-pt.c
> @@ -2531,6 +2531,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
> }
>
> pt->timeless_decoding = intel_pt_timeless_decoding(pt);
> + if (pt->timeless_decoding && !pt->tc.time_mult)
> + pt->tc.time_mult = 1;
> pt->have_tsc = intel_pt_have_tsc(pt);
> pt->sampling_mode = false;
> pt->est_tsc = !pt->timeless_decoding;
> --
> 2.17.1
--
- Arnaldo
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