linux-kernel - Re: [RFC PATCH 1/7] x86, mm: ZONE

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Message-ID: <20150815133355.GA24382@lst.de>
Date:	Sat, 15 Aug 2015 15:33:55 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org, boaz@...xistor.com, riel@...hat.com,
	linux-nvdimm@...ts.01.org,
	Dave Hansen <dave.hansen@...ux.intel.com>, david@...morbit.com,
	mingo@...nel.org, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>, mgorman@...e.de,
	"H. Peter Anvin" <hpa@...or.com>, ross.zwisler@...ux.intel.com,
	torvalds@...ux-foundation.org, hch@....de
Subject: Re: [RFC PATCH 1/7] x86, mm: ZONE_DEVICE for "device memory"

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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