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-rw-r--r--fs/gfs2/lock_dlm.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 31df26ed7854..4361804646d8 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -1,10 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright 2004-2011 Red Hat, Inc.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -31,9 +28,10 @@
* @delta is the difference between the current rtt sample and the
* running average srtt. We add 1/8 of that to the srtt in order to
* update the current srtt estimate. The variance estimate is a bit
- * more complicated. We subtract the abs value of the @delta from
- * the current variance estimate and add 1/4 of that to the running
- * total.
+ * more complicated. We subtract the current variance estimate from
+ * the abs value of the @delta and add 1/4 of that to the running
+ * total. That's equivalent to 3/4 of the current variance
+ * estimate plus 1/4 of the abs of @delta.
*
* Note that the index points at the array entry containing the smoothed
* mean value, and the variance is always in the following entry
@@ -49,7 +47,7 @@ static inline void gfs2_update_stats(struct gfs2_lkstats *s, unsigned index,
s64 delta = sample - s->stats[index];
s->stats[index] += (delta >> 3);
index++;
- s->stats[index] += ((abs(delta) - s->stats[index]) >> 2);
+ s->stats[index] += (s64)(abs(delta) - s->stats[index]) >> 2;
}
/**