lib: Add generic exponentially weighted moving average (EWMA) function
This adds generic functions for calculating Exponentially Weighted Moving
Averages (EWMA). This implementation makes use of a structure which keeps the
EWMA parameters and a scaled up internal representation to reduce rounding
errors.
The original idea for this implementation came from the rt2x00 driver
(rt2x00link.c). I would like to use it in several places in the mac80211 and
ath5k code and I hope it can be useful in many other places in the kernel code.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/lib/Makefile b/lib/Makefile
index e6a3763..76d3b85 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -106,6 +106,8 @@
obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o
+obj-$(CONFIG_AVERAGE) += average.o
+
hostprogs-y := gen_crc32table
clean-files := crc32table.h