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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-22 08:31:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-22 08:31:09 -0700
commit651bae980e3f3e6acf0d297ced08f9d7af71a8c9 (patch)
treecb30382a40c8d4363a3356a7253fe56c42c74806 /fs/gfs2
parentf75b6f303bd80249a56cce9028954b4f731270e3 (diff)
parent5a5ec83d6ac974b12085cd99b196795f14079037 (diff)
Merge tag 'gfs2-5.1.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
Pull gfs2 fix from Andreas Gruenbacher: "Fix a gfs2 sign extension bug introduced in v4.3" * tag 'gfs2-5.1.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2: gfs2: Fix sign extension bug in gfs2_update_stats
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/lock_dlm.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 31df26ed7854..69bd1597bacf 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -31,9 +31,10 @@
* @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 +50,7 @@ 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;
}
/**