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| author | Adrian Hunter <adrian.hunter@intel.com> | 2019-03-01 12:35:36 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-03-23 20:11:38 +0100 |
| commit | 99e5abb7b8958c4bfaa9a155cfa4e3600d336854 (patch) | |
| tree | 18b6bfaae5880bff1b09997a55812eac2f00f107 /tools/perf | |
| parent | 85c9f1fb8a81ddd2bbd1c7259b8454b09d51ee09 (diff) | |
| download | talos-obmc-linux-99e5abb7b8958c4bfaa9a155cfa4e3600d336854.tar.gz talos-obmc-linux-99e5abb7b8958c4bfaa9a155cfa4e3600d336854.zip | |
perf intel-pt: Fix divide by zero when TSC is not available
commit 076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa upstream.
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.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org # v4.9+
Link: https://lkml.kernel.org/n/tip-1i4j0wqoc8vlbkcizqqxpsf4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/intel-pt.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 2e72373ec6df..4493fc13a6fa 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -2522,6 +2522,8 @@ 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; |
