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@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20170824162737.7813-7-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/values.c b/tools/perf/util/values.c
index 5de2e15..9ac36bf 100644 (file)
--- 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;
 }