linux-kernel - [PATCH 3/4] perf intel-pt: Fix MTC timing after overflow

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Date:   Thu, 31 May 2018 13:23:44 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] perf intel-pt: Fix MTC timing after overflow

On some platforms, overflows will clear before MTC wraparound, and there is
no following TSC/TMA packet. In that case the previous TMA is valid. Since
there will be a valid TMA either way, stop setting 'have_tma' to false upon
overflow.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: stable@...r.kernel.org
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index e5eb91777383..881d7c5e5e2a 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -1376,7 +1376,6 @@ static int intel_pt_overflow(struct intel_pt_decoder *decoder)
 {
 	intel_pt_log("ERROR: Buffer overflow\n");
 	intel_pt_clear_tx_flags(decoder);
-	decoder->have_tma = false;
 	decoder->cbr = 0;
 	decoder->timestamp_insn_cnt = 0;
 	decoder->pkt_state = INTEL_PT_STATE_ERR_RESYNC;
-- 
1.9.1