linux-kernel - Re: [PATCH 0/3 v5] e820: Fix handling of NvDIMM chips

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Message-ID: <CALCETrVX6SVOdH7W_eU_f=ueNHRSMa8ZcVFqF85zpuegpBqhQg@mail.gmail.com>
Date:	Thu, 5 Mar 2015 15:06:38 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Boaz Harrosh <boaz@...xistor.com>, Ingo Molnar <mingo@...hat.com>,
	X86 ML <x86@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 0/3 v5] e820: Fix handling of NvDIMM chips

On Thu, Mar 5, 2015 at 2:48 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Seriously, if type 12 is the de facto standard for NvDIMMs, I think we
> should add it.  The documented ACPI method of using flags was doomed
> from the start.

I think it's a de facto standard that type 12 means "nvdimm".  I don't
think there's any kind of standard as to whether that means that it's
permissible to touch that memory or that nvdimm means type 12.

I have no problem w/ the resource name saying "nvdimm", but I do
object to autoloading anything as a result.

(There is no type 12 on EFI, nor will there ever be, since there is no
e820 at all on EFI.)

--Andy

>
>         -hpa
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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