linux-kernel - Re: [RFC PATCH 05/17] phy_driver: Make .read_status()/.config

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Message-Id: <201110201710.17519.vapier@gentoo.org>
Date:	Thu, 20 Oct 2011 17:10:12 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	Kyle Moffett <Kyle.D.Moffett@...ing.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Dietsche <Gregory.Dietsche@....edu>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	David Daney <ddaney@...iumnetworks.com>,
	Arnaud Patard <arnaud.patard@...-net.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Baruch Siach <baruch@...s.co.il>,
	Thorsten Schubert <tshu@...-ge.com>,
	David Decotigny <decot@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	"Marc Kleine-Budde" <mkl@...gutronix.de>, linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH 05/17] phy_driver: Make .read_status()/.config_aneg() optional

On Thursday 20 October 2011 17:00:12 Kyle Moffett wrote:
> Approximately 90% of the PHY drivers follow the PHY layer docs and
> simply use &genphy_read_status and &genphy_config_aneg.  There would
> seem to be little point in requiring them all to manually specify those
> functions.

well, it does make sense if you think about the compile vs build time 
overhead.  yes, your patch does make things much nicer to read, and a little 
easier to maintain the source.  however, it adds runtime overhead (checking 
the func pointers) while the func pointer storage is unchanged (it's now a 
NULL pointer instead of pointing to the genphy funcs).  personally, i think 
the savings in runtime and smaller compiled code is more important.  so i'm 
going to NAK this.  sorry.

> This patch makes it much easier for subsequent patches to split and
> refactor the functionality of the .config_aneg() method.
> 
> Signed-off-by: Kyle Moffett <Kyle.D.Moffett@...ing.com>
> ---
>  Documentation/networking/phy.txt |   13 +++++--------
>  drivers/net/phy/bcm63xx.c        |    4 ----

hrm, what tree are you using ?  this driver is not in mainline.
-mike

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