linux-kernel - Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

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Message-ID: <20150219004731.GA5477@infradead.org>
Date:	Wed, 18 Feb 2015 16:47:31 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Boaz Harrosh <boaz@...xistor.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>, x86@...nel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Linux-nvdimm] [PATCH 0/2] e820: Fix handling of NvDIMM chips

On Wed, Feb 18, 2015 at 10:15:32AM -0800, Dan Williams wrote:
> In fact it was originally "type-6" until ACPI 5 claimed that number
> for official use, so these platforms, with early proof-of-concept
> nvdimm support, have already gone through one transition to a new
> number.  They need to do the same once an official number for nvdimm
> support is published.
> 
> Put another way, these early platforms are already using out-of-tree
> patches for nvdimm enabling.  They can continue to do so, or switch to
> standard methods when the standard is published.

Not supporting hardware that is widely avaiable (I have some, too)
is not very user friendly.

I'll submit a patch allowing a nvdimm_type= kernel option that allows
to detect them, but will do nothing by default.  The code needed is very
small and it would be very useful for all kinds of projects.
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