diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2019-03-01 12:35:36 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-03-01 14:48:30 -0300 |
| commit | 076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa (patch) | |
| tree | 22562c2f3c6a1cfe9bfd63c23ab1eca1052fb657 /tools/perf/util/intel-pt.c | |
| parent | c1c49204b0114daf210c79d66a5980c8e6f8f8fb (diff) | |
| download | lwn-076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa.tar.gz lwn-076333870c2f5bdd9b6d31e7ca1909cf0c84cbfa.zip | |
perf intel-pt: Fix divide by zero when TSC is not available
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>
Diffstat (limited to 'tools/perf/util/intel-pt.c')
| -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 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; |