linux-kernel - Re: [PATCH 5/5] Net: ath5k, kconfig changes

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Message-ID: <20070830123554.GA2176@infradead.org>
Date:	Thu, 30 Aug 2007 13:35:54 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Kossifidis <mickflemm@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jiri Slaby <jirislaby@...il.com>, linville@...driver.com,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] Net: ath5k, kconfig changes

On Thu, Aug 30, 2007 at 04:38:09AM +0300, Nick Kossifidis wrote:
> It saves big chunks of code (not only initial register settings
> arrays) and we'll extend it's use more inside ath5k_hw.c Trust me this
> is a very useful step, eg. check out descriptor processing / setup or
> PHY functions (calibrate/channel set etc). For example AR5210 mac chip
> only comes with RF5110 phy chip so we can get rid of RF5111/RF5112
> code, AR5211 comes with RF5111 so we can get rid of RF5110 and RF5112
> code and AR5212 comes with RF5111 or RF5112 so we get rid of RF5110.
> This thing also saves lots of checks during runtime (some of them
> happen verry frequently, eg. durring descriptor processing). Also most
> people will use 5212 code only, 5211 cards are on some old laptops and
> 5210, well i couldn't even find  a 5210 for actual testing :P

If you're doing these checks in a hotpath something is badly wrong with
your architecture.
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