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

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Message-ID: <4A3DE3F3.4000100@linux.intel.com>
Date:	Sun, 21 Jun 2009 00:40:35 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Pavel Machek <pavel@....cz>
CC:	Yinghai Lu <yhlu.kernel@...il.com>,
	Matthew Wilcox <matthew@....cx>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	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

Pavel Machek wrote:
> On Thu 2009-06-11 13:46:52, H. Peter Anvin wrote:
>> Yinghai Lu wrote:
>>> do we need do that on every cpu?
>>>
>>> looks like we could do that in identify_boot_cpu.
>>>
>> What if the CPUs are heterogenous?  It's obviously a suboptimal
>> situation, but it doesn't seem like something we can rely on.
> 
> Is it ok if that changes during runtime? What if someone hotplugs
> heterogenous cpu? I'd say basing it on boot cpu seems simplest.
> 									Pavel
> 

If someone hotplugs heterogenous CPUs it should do the right thing if 
the right thing is possible to do.  If you already have resource 
assignments that are unfulfillable you're screwed anyway.

	-hpa

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