linux-kernel - Re: [PATCH] arch/x86/mm/srat: Print non-volatile flag in SRAT

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Date:	Tue, 1 Sep 2015 15:23:13 -0400
From:	Linda Knippers <linda.knippers@...com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, mingo@...hat.com,
	hpa@...or.com
Subject: Re: [PATCH] arch/x86/mm/srat: Print non-volatile flag in SRAT

On 9/1/2015 3:17 PM, Thomas Gleixner wrote:
> On Tue, 1 Sep 2015, Linda Knippers wrote:
>> Nobody checks this flag but it would be interesting to know if it's being
>> set on any platforms.
> 
> What you're omitting to explain, is WHY it would be interesting.

With the addition of NVDIMM support, a question came up as to whether
NVDIMM ranges should be in the SRAT with this bit set.  I think the
consensus was no because the ranges are in the NFIT with proximity
domain information there.

ACPI is not clear on the meaning of this bit in the SRAT.
If someone is setting it, we might want to ask them what they expect
to happen with it.

Right now this bit is only printed if all the ACPI debug information is
turned on.

Sorry, I should have explained more.

-- ljk

> 
> Thanks,
> 
> 	tglx
> 

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