From: Dave Jones <davej@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Santiago Leon <santil@us.ibm.com>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
Jeff Garzik <jgarzik@pobox.com>
Subject: Re: [PATCH][2.6] IBM PowerPC Virtual Ethernet Driver
Date: Wed, 18 Feb 2004 04:01:30 +0000 [thread overview]
Message-ID: <20040218040130.GC26304@redhat.com> (raw)
In-Reply-To: <1077065118.1082.83.camel@gaston>
On Wed, Feb 18, 2004 at 11:45:20AM +1100, Benjamin Herrenschmidt wrote:
> BITFIELDS ARE EVIL !!!
>
> Especially when mapping things like HW registers... I know the p/iSeries
> code is full of them, I'd strongly recommend getting rid of them.
>
> The compiler is perfectly free, afaik, to re-order them
That can't be right surely ? That would make them utterly useless afaics.
I've not seen this happen in practice either with the 2 x86 cpufreq drivers
I wrote that both use bitfields extensively.
Dave
next prev parent reply other threads:[~2004-02-18 4:04 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-17 22:48 [PATCH][2.6] IBM PowerPC Virtual Ethernet Driver Santiago Leon
2004-02-18 0:45 ` Benjamin Herrenschmidt
2004-02-18 4:01 ` Dave Jones [this message]
2004-02-18 4:23 ` viro
2004-02-18 4:46 ` Linus Torvalds
2004-02-18 5:03 ` Benjamin Herrenschmidt
2004-02-18 16:39 ` Linus Torvalds
2004-02-18 5:04 ` viro
2004-02-18 4:19 ` Keith Owens
2004-02-18 4:42 ` Andrew Morton
2004-02-18 4:48 ` Linus Torvalds
2004-02-20 23:26 ` Santiago Leon
2004-02-22 22:11 ` Pavel Machek
2004-02-26 5:52 ` Jeff Garzik
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