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: /usr/src/linux-headers-4.4.0-206/include/linux/ [ drwxr-xr-x ]
name : average.h #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 */