linux-kernel - [tip:perf/core] perf intel-PT/BTS: Add missing initialization

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Date:   Tue, 7 Mar 2017 00:19:16 -0800
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
        dsahern@...il.com, acme@...hat.com, mingo@...nel.org,
        namhyung@...nel.org, adrian.hunter@...el.com, tglx@...utronix.de
Subject: [tip:perf/core] perf intel-PT/BTS: Add missing initialization

Commit-ID:  f1c4d1ad39b5f7c617572f93658bb7159ec9c686
Gitweb:     http://git.kernel.org/tip/f1c4d1ad39b5f7c617572f93658bb7159ec9c686
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Tue, 28 Feb 2017 12:02:36 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 3 Mar 2017 19:07:18 -0300

perf intel-PT/BTS: Add missing initialization

  $ perf test decoder
  57: x86 instruction decoder - new instructions : FAILED!
  $

  Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 80 78 56 34 12 	bndstx %bnd0,0x12345678(%rax)
  Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 85 78 56 34 12 	bndstx %bnd0,0x12345678(%rbp)
  Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 01 78 56 34 12 	bndstx %bnd0,0x12345678(%rcx,%rax,1)
  Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 05 78 56 34 12 	bndstx %bnd0,0x12345678(%rbp,%rax,1)
  Failed to decode 'rel' value (0xfffffffc vs expected 0): 0f 1b 84 08 78 56 34 12 	bndstx %bnd0,0x12345678(%rax,%rcx,1)

There is missing initialization.  It only affects the test because it is
checking 'rel' even in cases where there is no value.

Fix it.

Reported-and-Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: http://lkml.kernel.org/r/08c6ad07-7994-3e56-b20e-d75727ca7765@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
index 7913363..55b6250 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c
@@ -39,6 +39,8 @@ static void intel_pt_insn_decoder(struct insn *insn,
 	enum intel_pt_insn_branch branch = INTEL_PT_BR_NO_BRANCH;
 	int ext;
 
+	intel_pt_insn->rel = 0;
+
 	if (insn_is_avx(insn)) {
 		intel_pt_insn->op = INTEL_PT_OP_OTHER;
 		intel_pt_insn->branch = INTEL_PT_BR_NO_BRANCH;