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Date: Wed, 08 Aug 2007 09:46:16 -0700
From: Roland Dreier <rdreier@...co.com>
To: Michael Buesch <mb@...sch.de>
Cc: Jeff Garzik <jeff@...zik.org>, Andi Kleen <andi@...stfloor.org>,
ggrundstrom@...effect.com, ewg@...ts.openfabrics.org,
netdev@...r.kernel.org
Subject: Re: [PATCH 2/14] nes: device structures and defines
> The barrier/ordering issue however might be a critical thing,
> when using __raw_XXX. So one must always mmiowb() after such a write.
Not mmiowb() -- that is for ordering between CPUs, eg on systems like
Altix where PCI transactions might get reordered in the system fabric
before reaching the PCI bus.
You need a full wmb() to order between __raw_writel()s.
- R.
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