From: Adrian Hunter adrian.hunter@intel.com

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 --- 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;