From: Johannes Berg <johannes.berg@xxxxxxxxx>
My patches to remove the out-of-line EWMA implemenation (under
Kconfig symbol AVERAGE) went into net-next, so now we only need
to backport DECLARE_EWMA as the only necessary macro.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
backport/backport-include/linux/average.h | 46 +++++++++++++++++++++++++++++++
backport/compat/Kconfig | 11 --------
2 files changed, 46 insertions(+), 11 deletions(-)
create mode 100644 backport/backport-include/linux/average.h
diff --git a/backport/backport-include/linux/average.h b/backport/backport-include/linux/average.h
new file mode 100644
index 000000000000..5d80041fe5e8
--- /dev/null
+++ b/backport/backport-include/linux/average.h
@@ -0,0 +1,46 @@
+#ifndef __BACKPORT_AVERAGE
+#define __BACKPORT_AVERAGE
+#include_next <linux/average.h>
+
+#ifndef DECLARE_EWMA
+#define DECLARE_EWMA(name, _factor, _weight) \
+ struct ewma_##name { \
+ unsigned long internal; \
+ }; \
+ static inline void ewma_##name##_init(struct ewma_##name *e) \
+ { \
+ BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
+ e->internal = 0; \
+ } \
+ static inline unsigned long \
+ ewma_##name##_read(struct ewma_##name *e) \
+ { \
+ BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
+ return e->internal >> ilog2(_factor); \
+ } \
+ static inline void ewma_##name##_add(struct ewma_##name *e, \
+ unsigned long val) \
+ { \
+ unsigned long internal = ACCESS_ONCE(e->internal); \
+ unsigned long weight = ilog2(_weight); \
+ unsigned long factor = ilog2(_factor); \
+ \
+ BUILD_BUG_ON(!__builtin_constant_p(_factor)); \
+ BUILD_BUG_ON(!__builtin_constant_p(_weight)); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_factor); \
+ BUILD_BUG_ON_NOT_POWER_OF_2(_weight); \
+ \
+ ACCESS_ONCE(e->internal) = internal ? \
+ (((internal << weight) - internal) + \
+ (val << factor)) >> weight : \
+ (val << factor); \
+ }
+#endif /* DECLARE_EWMA */
+
+#endif /* __BACKPORT_AVERAGE */
diff --git a/backport/compat/Kconfig b/backport/compat/Kconfig
index ed600a3e53bb..7c88729c3ec2 100644
--- a/backport/compat/Kconfig
+++ b/backport/compat/Kconfig
@@ -73,17 +73,6 @@ config BPAUTO_BUILD_CORDIC
config BPAUTO_CORDIC
bool
-config BPAUTO_BUILD_AVERAGE
- bool
- depends on !AVERAGE
- default y if BPAUTO_USERSEL_BUILD_ALL
- default y if BPAUTO_AVERAGE
- #h-file linux/average.h
- #c-file lib/average.c
-
-config BPAUTO_AVERAGE
- bool
-
config BPAUTO_MII
bool
--
2.1.4
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