Commit 07633387 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo

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: default avatarAdrian 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.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent c1c49204
...@@ -2531,6 +2531,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event, ...@@ -2531,6 +2531,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
} }
pt->timeless_decoding = intel_pt_timeless_decoding(pt); 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->have_tsc = intel_pt_have_tsc(pt);
pt->sampling_mode = false; pt->sampling_mode = false;
pt->est_tsc = !pt->timeless_decoding; pt->est_tsc = !pt->timeless_decoding;
......
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