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Commit 4213d9b8 authored by Adrian Hunter's avatar Adrian Hunter Committed by Greg Kroah-Hartman
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perf intel-pt: Fix MTC timing after overflow 



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: default avatarAdrian 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 282f1f66

tools/perf/util/intel-pt-decoder/intel-pt-decoder.c

+0 −1
Original line number Diff line number Diff line
@@ -1298,7 +1298,6 @@ 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;