From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [PATCH 3/4] myri10ge - Driver core
Date: Thu, 25 May 2006 17:56:49 +1000
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	 <20060517220608.GD13411@myri.com>  <20060523153928.GB5938@krispykreme>
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Cc: Brice Goglin <brice@myri.com>, netdev@vger.kernel.org,
	gallatin@myri.com, linux-kernel@vger.kernel.org
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To: Anton Blanchard <anton@samba.org>
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On Wed, 2006-05-24 at 01:39 +1000, Anton Blanchard wrote:

> > +#ifdef CONFIG_MTRR
> > +	mgp->mtrr = mtrr_add(mgp->iomem_base, mgp->board_span,
> > +			     MTRR_TYPE_WRCOMB, 1);
> > +#endif
> ...
> > +	mgp->sram = ioremap(mgp->iomem_base, mgp->board_span);
> 
> Not sure how we are meant to specify write through in drivers. Any ideas Ben?

No proper interface exposed, he'll have to do an #ifdef powerpc here or
such and use __ioremap with explicit page attributes. I have a hack to
do that automatically for memory covered by prefetchable PCI BARs when
mmap'ing from userland but not for kernel ioremap.

Ben.