linux-kernel - Re: [PATCH v3 09/21] libnd, nd_pmem: add libnd support to the pmem driver

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Message-ID: <20150523143935.GA23903@infradead.org>
Date:	Sat, 23 May 2015 07:39:35 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	axboe@...nel.dk, linux-nvdimm@...1.01.org, neilb@...e.de,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Jens Axboe <axboe@...com>, linux-acpi@...r.kernel.org,
	"H. Peter Anvin" <hpa@...or.com>, hch@....de, mingo@...nel.org
Subject: Re: [PATCH v3 09/21] libnd, nd_pmem: add libnd support to the pmem
 driver

On Wed, May 20, 2015 at 04:57:00PM -0400, Dan Williams wrote:
> nd_pmem attaches to persistent memory regions and namespaces emitted by
> the libnd subsystem, and, same as the original pmem driver, presents the
> system-physical-address range as a block device.
> 
> The existing e820-type-12 to pmem setup is converted to a full libnd bus
> that emits an nd_namespace_io device.

This looks completely bonkers.  If you want to pretend the legacy
e820 NVDIMMs fit into your new world do that directly in
arch/x86/kernel/pmem.c instead of splitting it over two files.
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