diff options
author | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-11 10:41:07 +0300 |
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committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-04-13 08:17:18 +0300 |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/lib/average.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/lib/average.c')
-rw-r--r-- | kernel/lib/average.c | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/kernel/lib/average.c b/kernel/lib/average.c deleted file mode 100644 index 114d1beae..000000000 --- a/kernel/lib/average.c +++ /dev/null @@ -1,64 +0,0 @@ -/* - * lib/average.c - * - * This source code is licensed under the GNU General Public License, - * Version 2. See the file COPYING for more details. - */ - -#include <linux/export.h> -#include <linux/average.h> -#include <linux/kernel.h> -#include <linux/bug.h> -#include <linux/log2.h> - -/** - * DOC: Exponentially Weighted Moving Average (EWMA) - * - * These are generic functions for calculating Exponentially Weighted Moving - * Averages (EWMA). We keep a structure with the EWMA parameters and a scaled - * up internal representation of the average value to prevent rounding errors. - * The factor for scaling up and the exponential weight (or decay rate) have to - * be specified thru the init fuction. The structure should not be accessed - * directly but only thru the helper functions. - */ - -/** - * ewma_init() - Initialize EWMA parameters - * @avg: Average structure - * @factor: Factor to use for the scaled up internal value. The maximum value - * of averages can be ULONG_MAX/(factor*weight). For performance reasons - * factor has to be a power of 2. - * @weight: Exponential weight, or decay rate. This defines how fast the - * influence of older values decreases. For performance reasons weight has - * to be a power of 2. - * - * Initialize the EWMA parameters for a given struct ewma @avg. - */ -void ewma_init(struct ewma *avg, unsigned long factor, unsigned long weight) -{ - WARN_ON(!is_power_of_2(weight) || !is_power_of_2(factor)); - - avg->weight = ilog2(weight); - avg->factor = ilog2(factor); - avg->internal = 0; -} -EXPORT_SYMBOL(ewma_init); - -/** - * ewma_add() - Exponentially weighted moving average (EWMA) - * @avg: Average structure - * @val: Current value - * - * Add a sample to the average. - */ -struct ewma *ewma_add(struct ewma *avg, unsigned long val) -{ - unsigned long internal = ACCESS_ONCE(avg->internal); - - ACCESS_ONCE(avg->internal) = internal ? - (((internal << avg->weight) - internal) + - (val << avg->factor)) >> avg->weight : - (val << avg->factor); - return avg; -} -EXPORT_SYMBOL(ewma_add); |