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yaml --- r: 269017 b: refs/heads/master c: 19f4740 h: refs/heads/master i: 269015: ec72603 v: v3
git-mirror · Sep 29, 2011 · e06773e · e06773e
1 parent 9dd545d
commit e06773e
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 56f3bae70638b33477a6015fd362ccfe354fd3ee
+refs/heads/master: 19f4740255668ca297dcf9f02d80eb9bc87a1d66
diff --git a/trunk/tools/perf/builtin-stat.c b/trunk/tools/perf/builtin-stat.c
@@ -254,8 +254,13 @@ static double avg_stats(struct stats *stats)
  */
 static double stddev_stats(struct stats *stats)
 {
-	double variance = stats->M2 / (stats->n - 1);
-	double variance_mean = variance / stats->n;
+	double variance, variance_mean;
+
+	if (!stats->n)
+		return 0.0;
+
+	variance = stats->M2 / (stats->n - 1);
+	variance_mean = variance / stats->n;
 
 	return sqrt(variance_mean);
 }