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    Subject[PATCH 4.17 170/220] perf intel-pt: Fix MTC timing after overflow
    Date
    4.17-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Adrian Hunter <adrian.hunter@intel.com>

    commit dd27b87ab5fcf3ea1c060b5e3ab5d31cc78e9f4c upstream.

    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@intel.com>
    Cc: stable@vger.kernel.org
    Link: http://lkml.kernel.org/r/1527762225-26024-4-git-send-email-adrian.hunter@intel.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 1 -
    1 file changed, 1 deletion(-)

    --- 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 inte
    {
    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;

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