linux-kernel - [tip:perf/core] perf intel-pt: Packet splitting can happen only on 32-bit

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Message-ID: <tip-26ee2bcdea33c60aa833cc32a1624ef5d49c9c6f@git.kernel.org>
Date:   Sat, 9 Feb 2019 05:02:10 -0800
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, acme@...hat.com, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        mingo@...nel.org, jolsa@...hat.com
Subject: [tip:perf/core] perf intel-pt: Packet splitting can happen only on
 32-bit

Commit-ID:  26ee2bcdea33c60aa833cc32a1624ef5d49c9c6f
Gitweb:     https://git.kernel.org/tip/26ee2bcdea33c60aa833cc32a1624ef5d49c9c6f
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Wed, 6 Feb 2019 12:39:46 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 6 Feb 2019 10:27:54 -0300

perf intel-pt: Packet splitting can happen only on 32-bit

Data is copied when the trace is stopped, so packets are never split
between buffers except when processing if the buffer cannot fit in the
address space which can only happen on 32-bit systems. Change the logic
to reflect that.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190206103947.15750-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
 1 file changed, 1 insertion(+), 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 a54d6c9a4601..6e03db142091 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -868,7 +868,7 @@ static int intel_pt_get_next_packet(struct intel_pt_decoder *decoder)
 
 		ret = intel_pt_get_packet(decoder->buf, decoder->len,
 					  &decoder->packet);
-		if (ret == INTEL_PT_NEED_MORE_BYTES &&
+		if (ret == INTEL_PT_NEED_MORE_BYTES && BITS_PER_LONG == 32 &&
 		    decoder->len < INTEL_PT_PKT_MAX_SZ && !decoder->next_buf) {
 			ret = intel_pt_get_split_packet(decoder);
 			if (ret < 0)