linux-kernel - Re: RFC: x86: cap iomem_resource to addressable physical memory

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Message-ID: <20090611121742.2c0fae8d@jbarnes-g45>
Date:	Thu, 11 Jun 2009 12:17:42 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"H. Peter Anvin" <hpa@...ux.intel.com>
Cc:	Matthew Wilcox <matthew@....cx>, Martin Mares <mj@....cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
	the arch/x86 maintainers <x86@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arch@...r.kernel.org
Subject: Re: RFC: x86: cap iomem_resource to addressable physical memory

On Tue, 09 Jun 2009 18:32:53 -0700
"H. Peter Anvin" <hpa@...ux.intel.com> wrote:

> x86 cannot generate full 64-bit addresses; this patch clamps iomem
> addresses to the accessible range.
> 
> I wanted to post it for review before committing it, however; comments
> would be appreciated, especially of the kind "this is done too
> early/too late/in the wrong place/incorrectly".
> 
> 	-hpa

Seems reasonable, since the iomem_resource describes the CPU's view of
MMIO space it should probably reflect what it can actually access.

Reviewed-by: Jesse Barnes <jbarnes@...tuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center
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