Date: Sat, 15 Aug 2015 15:33:55 +0200
From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-kernel@vger.kernel.org, boaz@plexistor.com, riel@redhat.com,
        linux-nvdimm@ml01.01.org, Dave Hansen <dave.hansen@linux.intel.com>,
        david@fromorbit.com, mingo@kernel.org, linux-mm@kvack.org,
        Ingo Molnar <mingo@redhat.com>, mgorman@suse.de,
        "H. Peter Anvin" <hpa@zytor.com>, ross.zwisler@linux.intel.com,
        torvalds@linux-foundation.org, hch@lst.de
Subject: Re: [RFC PATCH 1/7] x86, mm: ZONE_DEVICE for "device memory"
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On Wed, Aug 12, 2015 at 11:50:05PM -0400, Dan Williams wrote:
> arch_add_memory() is reorganized a bit in preparation for a new
> arch_add_dev_memory() api, for now there is no functional change to the
> memory hotplug code.

Instead of the new arch_add_dev_memory call I'd just add a bool device
argument to arch_add_memory and zone_for_memory (and later the altmap
pointer aswell).

arch_add_memory is a candidate to be factored into common code,
except for s390 everything could be done with two small arch callouts.
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