Repository : ssh://git@open-mesh.org/openwrt-feed-devel
On branch : master
commit 2e168e4fba7c1d9d0b7163e5b0a2e9e3283108ae Author: Sven Eckelmann sven@narfation.org Date: Sat Mar 4 17:08:47 2017 +0100
batman-adv-devel: upgrade compat-hacks for release 2017.0.1
Signed-off-by: Sven Eckelmann sven@narfation.org
2e168e4fba7c1d9d0b7163e5b0a2e9e3283108ae batman-adv-devel/files/compat-hacks.h | 75 +++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+)
diff --git a/batman-adv-devel/files/compat-hacks.h b/batman-adv-devel/files/compat-hacks.h index 6c98a98..8c8a889 100644 --- a/batman-adv-devel/files/compat-hacks.h +++ b/batman-adv-devel/files/compat-hacks.h @@ -213,3 +213,78 @@ static inline int batadv_nla_put_u64_64bit(struct sk_buff *skb, int attrtype, #define __ro_after_init
#endif /* < KERNEL_VERSION(4, 10, 0) */ + +/* <DECLARE_EWMA> */ + +#include <linux/version.h> +#include_next <linux/average.h> + +#include <linux/bug.h> + +#ifdef DECLARE_EWMA +#undef DECLARE_EWMA +#endif /* DECLARE_EWMA */ + +/* + * Exponentially weighted moving average (EWMA) + * + * This implements a fixed-precision EWMA algorithm, with both the + * precision and fall-off coefficient determined at compile-time + * and built into the generated helper funtions. + * + * The first argument to the macro is the name that will be used + * for the struct and helper functions. + * + * The second argument, the precision, expresses how many bits are + * used for the fractional part of the fixed-precision values. + * + * The third argument, the weight reciprocal, determines how the + * new values will be weighed vs. the old state, new values will + * get weight 1/weight_rcp and old values 1-1/weight_rcp. Note + * that this parameter must be a power of two for efficiency. + */ + +#define DECLARE_EWMA(name, _precision, _weight_rcp) \ + struct ewma_##name { \ + unsigned long internal; \ + }; \ + static inline void ewma_##name##_init(struct ewma_##name *e) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_precision)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \ + /* \ + * Even if you want to feed it just 0/1 you should have \ + * some bits for the non-fractional part... \ + */ \ + BUILD_BUG_ON((_precision) > 30); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \ + e->internal = 0; \ + } \ + static inline unsigned long \ + ewma_##name##_read(struct ewma_##name *e) \ + { \ + BUILD_BUG_ON(!__builtin_constant_p(_precision)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \ + BUILD_BUG_ON((_precision) > 30); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \ + return e->internal >> (_precision); \ + } \ + static inline void ewma_##name##_add(struct ewma_##name *e, \ + unsigned long val) \ + { \ + unsigned long internal = ACCESS_ONCE(e->internal); \ + unsigned long weight_rcp = ilog2(_weight_rcp); \ + unsigned long precision = _precision; \ + \ + BUILD_BUG_ON(!__builtin_constant_p(_precision)); \ + BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \ + BUILD_BUG_ON((_precision) > 30); \ + BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \ + \ + ACCESS_ONCE(e->internal) = internal ? \ + (((internal << weight_rcp) - internal) + \ + (val << precision)) >> weight_rcp : \ + (val << precision); \ + } + +/* </DECLARE_EWMA> */