From: Jeff Garzik <jeff@garzik.org>
To: Michael Buesch <mb@bu3sch.de>
Cc: Roland Dreier <rdreier@cisco.com>,
Andi Kleen <andi@firstfloor.org>,
ggrundstrom@neteffect.com, ewg@lists.openfabrics.org,
netdev@vger.kernel.org
Subject: Re: [PATCH 2/14] nes: device structures and defines
Date: Wed, 08 Aug 2007 12:33:24 -0400 [thread overview]
Message-ID: <46B9F054.4030000@garzik.org> (raw)
In-Reply-To: <200708081830.20129.mb@bu3sch.de>
Michael Buesch wrote:
> On Wednesday 08 August 2007 18:18:31 Roland Dreier wrote:
>> > But there are indeed a few cases that look wrong.
>>
>> yes...
>>
>> > arch/x86_64/kernel/pci-calgary.c: writel(cpu_to_be32(val), target);
>>
>> eg this almost certainly wants to be
>>
>> writel(swab32(val), target);
>>
>> or something equivalent like
>>
>> __raw_writel(cpu_to_be32(val), target);
>> /* plus some suffficent memory ordering */
>>
>> - R.
>>
>>
>
> certainly, yes.
> Most likely the __raw_writel variant is portable, but I am not
> sure. Anybody sure?
Yes, it's portable. You must however be aware of the guarantees that
writel() provides and __raw_writel() does not: no barriers or flushes,
no endian conversions, no ordering constraints, ... Probably a few more
details I'm forgetting too :)
Jeff
next prev parent reply other threads:[~2007-08-08 16:33 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-08 0:45 [PATCH 2/14] nes: device structures and defines ggrundstrom
2007-08-08 1:13 ` Jeff Garzik
2007-08-08 12:38 ` Andi Kleen
2007-08-08 11:50 ` Michael Buesch
2007-08-08 12:55 ` Andi Kleen
2007-08-08 13:02 ` Michael Buesch
2007-08-08 13:08 ` Andi Kleen
2007-08-08 13:28 ` Michael Buesch
2007-08-08 13:38 ` Andi Kleen
2007-08-08 13:48 ` Michael Buesch
2007-08-08 13:55 ` Michael Buesch
2007-08-08 16:18 ` Roland Dreier
2007-08-08 16:25 ` Jeff Garzik
2007-08-08 16:30 ` Michael Buesch
2007-08-08 16:33 ` Jeff Garzik [this message]
2007-08-08 16:43 ` Michael Buesch
2007-08-08 16:46 ` Roland Dreier
2007-08-08 16:57 ` akepner
2007-08-08 16:59 ` Jeff Garzik
2007-08-08 17:34 ` Michael Buesch
2007-08-08 19:40 ` Jeff Garzik
2007-08-08 16:39 ` Roland Dreier
2007-08-08 16:19 ` Jeff Garzik
2007-08-08 22:04 ` David Miller
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