linux-kernel - [tip:perf/core] perf values: Fix thread index bug

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Date:   Tue, 29 Aug 2017 14:21:07 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...nel.org, jolsa@...nel.org,
        andi@...stfloor.org, alexander.shishkin@...ux.intel.com,
        linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
        namhyung@...nel.org, hpa@...or.com, mark.rutland@....com,
        acme@...hat.com, dsahern@...il.com
Subject: [tip:perf/core] perf values: Fix thread index bug

Commit-ID:  64eed1deb6d87f4c0efe03297f50367a3689eb56
Gitweb:     http://git.kernel.org/tip/64eed1deb6d87f4c0efe03297f50367a3689eb56
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 24 Aug 2017 18:27:33 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 28 Aug 2017 16:44:42 -0300

perf values: Fix thread index bug

We are taking wrong index (+1) for first thread, which leaves thread
with index 0 unused and uninitialized.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20170824162737.7813-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/values.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/values.c b/tools/perf/util/values.c
index 5de2e15..9ac36bf 100644
--- a/tools/perf/util/values.c
+++ b/tools/perf/util/values.c
@@ -98,7 +98,7 @@ static int perf_read_values__findnew_thread(struct perf_read_values *values,
 			return i;
 	}
 
-	i = values->threads + 1;
+	i = values->threads;
 	values->value[i] = malloc(values->counters_max * sizeof(**values->value));
 	if (!values->value[i]) {
 		pr_debug("failed to allocate read_values counters array");
@@ -106,7 +106,7 @@ static int perf_read_values__findnew_thread(struct perf_read_values *values,
 	}
 	values->pid[i] = pid;
 	values->tid[i] = tid;
-	values->threads = i;
+	values->threads = i + 1;
 
 	return i;
 }