diff options
| author | David S. Miller <davem@davemloft.net> | 2015-08-17 14:25:04 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-08-17 14:25:04 -0700 |
| commit | 2bd736fa0d8a1da90e6ccaa6a79e56a8d2ae60c4 (patch) | |
| tree | d855a6972df023eeef682498be454f1dedc638c1 /include/linux/average.h | |
| parent | 90eb7fa51ccb9af58c437581af73c4a1d5fd2b9f (diff) | |
| parent | 8f9c98df949333f08b74e5df1caacf7e2c5e8552 (diff) | |
Merge tag 'mac80211-next-for-davem-2015-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
Johannes Berg says:
====================
Another pull request for the next cycle, this time with quite
a bit of content:
* mesh fixes/improvements from Alexis, Bob, Chun-Yeow and Jesse
* TDLS higher bandwidth support (Arik)
* OCB fixes from Bertold Van den Bergh
* suspend/resume fixes from Eliad
* dynamic SMPS support for minstrel-HT (Krishna Chaitanya)
* VHT bitrate mask support (Lorenzo Bianconi)
* better regulatory support for 5/10 MHz channels (Matthias May)
* basic support for MU-MIMO to avoid the multi-vif issue (Sara Sharon)
along with a number of other cleanups.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/average.h')
| -rw-r--r-- | include/linux/average.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/include/linux/average.h b/include/linux/average.h index c6028fd742c1..60f8226c5652 100644 --- a/include/linux/average.h +++ b/include/linux/average.h @@ -27,4 +27,43 @@ static inline unsigned long ewma_read(const struct ewma *avg) return avg->internal >> avg->factor; } +#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 */ |