linux-kernel - Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average

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Date:	Fri, 19 Nov 2010 13:16:51 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Bruno Randolf <br1@...fach.org>
Cc:	Bob Copeland <me@...copeland.com>,
	Johannes Berg <johannes@...solutions.net>,
	Jouni Malinen <j@...fi>, linville@...driver.com,
	randy.dunlap@...cle.com, blp@...stanford.edu,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lars_Ericsson@...ia.com, stefanr@...6.in-berlin.de,
	kosaki.motohiro@...fujitsu.com, akpm@...ux-foundation.org,
	kevin.granade@...il.com
Subject: Re: [PATCH v7 3/3] nl80211/mac80211: Report signal average

On Fri, 2010-11-19 at 18:07 +0900, Bruno Randolf wrote:

> Hmm, maybe I suck in mathemathics, but I don't see a way to do that given the 
> formula:
> 
> (((internal * (weight - 1)) + (val * factor)) / weight

If you assume weight == 2^n, you can write that as:

(((internal << n) - internal) + (val * factor)) >> n


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