Author: markj
Date: Sun Apr 12 21:35:13 2015
New Revision: 281472
URL: https://svnweb.freebsd.org/changeset/base/281472
Log:
MFC r278114:
libdtrace: Let the standard deviation of the empty set be 0.
PR: 197260
Modified:
stable/10/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c
==============================================================================
--- stable/10/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c
Sun Apr 12 21:28:54 2015 (r281471)
+++ stable/10/cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c
Sun Apr 12 21:35:13 2015 (r281472)
@@ -382,6 +382,9 @@ dt_stddev(uint64_t *data, uint64_t norma
int64_t norm_avg;
uint64_t diff[2];
+ if (data[0] == 0)
+ return (0);
+
/*
* The standard approximation for standard deviation is
* sqrt(average(x**2) - average(x)**2), i.e. the square root
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