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perf intel-pt: Fix divide by zero

PATCH Arnaldo Carvalho de Melo 1 participant 1 message Mar 1, 2019 1 message not in the archive

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Arnaldo Carvalho de Melo

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Em Fri, Mar 01, 2019 at 12:35:36PM +0200, Adrian Hunter escreveu:

Quoted 3 lines

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

Quoted 21 lines
Signed-off-by Adrian Hunter <[email protected]>
Cc [email protected] # v4.9+
---
 tools/perf/util/intel-pt.c | 2 ++
 1 file changed, 2 insertions(+)
tools/perf/util/intel-pt.c +2 -0
index 3b497bab4324..6d288237887b 100644
@@ -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;
Signature · 1 line
2.17.1
Signature · 1 line
- Arnaldo