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From: Wolfgang Denk <wd@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/4] net: tweak eth_device layout to simplify enetaddr use
Date: Mon, 05 Dec 2011 22:06:20 +0100	[thread overview]
Message-ID: <20111205210620.2626313BE0E6@gemini.denx.de> (raw)
In-Reply-To: <201111111003.15436.vapier@gentoo.org>

Dear Mike Frysinger,

In message <201111111003.15436.vapier@gentoo.org> you wrote:
>
> > I'm OK with expanding the name[] field, but as Thomas pointed out,
> > providing "convenient" u32 / u16 variables for the MAC address is
> > actually a faux ami that misleads people into using these variables
> > without thinking about endianess and such.
> > 
> > Please omit this part.
> 
> there's always the endian issue.  i'd wager that the vast majority of the 
> time, the endian of the target hardware is the same as the core.  so omitting 
> this for odd devices or device driver writers who aren't careful is being too 
> pessimistic imo.  i can add qualifiers to the name like "enetaddr_cpu32" if you 

No. Please drop this.

> want.  looking at the generated code shows really nice improvements: a single 
> cpu load instead of 4 loads interspersed with bitshifts.

This is neither memory nor performance critical, but it is easy to
misuse and thus dangerous.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
There's no honorable way to kill, no gentle way to destroy.  There is
nothing good in war.  Except its ending.
	-- Abraham Lincoln, "The Savage Curtain", stardate 5906.5

  parent reply	other threads:[~2011-12-05 21:06 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-11  0:11 [U-Boot] [PATCH 1/4] net/miiphy/serial: drop duplicate "NAMESIZE" define Mike Frysinger
2011-11-11  0:11 ` [U-Boot] [PATCH 2/4] net: tweak eth_device layout to simplify enetaddr use Mike Frysinger
2011-11-11 11:19   ` thomas.langer at lantiq.com
2011-11-11 11:55   ` Wolfgang Denk
2011-11-11 15:03     ` Mike Frysinger
2011-11-11 15:44       ` Andy Fleming
2011-11-11 16:06         ` Mike Frysinger
2011-12-05 21:06       ` Wolfgang Denk [this message]
2011-11-11  0:11 ` [U-Boot] [PATCH 3/4] Blackfin: bfin_mac: use new eth_device enetaddr members Mike Frysinger
2011-11-11  0:11 ` [U-Boot] [PATCH 4/4] usb: net: smsc95xx: attempt to fix enetaddr loading Mike Frysinger
2011-11-11 22:07 ` [U-Boot] [PATCH 1/4] net/miiphy/serial: drop duplicate "NAMESIZE" define Andy Fleming
2011-11-11 22:47   ` Mike Frysinger
2012-03-18 19:11 ` Wolfgang Denk

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