#ifndef _LINUX_AVERAGE_H#define _LINUX_AVERAGE_H /* Exponentially weighted moving average (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 /* _LINUX_AVERAGE_H */