From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dave Hansen <dave.hansen@intel.com>
Subject: Re: [RESEND PATCH v3 kernel 3/7] mm: add a function to get the max pfn
Date: Mon, 24 Oct 2016 09:53:10 -0700
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To: Liang Li <liang.z.li@intel.com>, mst@redhat.com
Cc: kvm@vger.kernel.org, amit.shah@redhat.com, qemu-devel@nongnu.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, Andrew Morton <akpm@linux-foundation.org>, virtualization@lists.linux-foundation.org, Mel Gorman <mgorman@techsingularity.net>, dgilbert@redhat.com
List-Id: virtualization@lists.linuxfoundation.org

On 10/20/2016 11:24 PM, Liang Li wrote:
> Expose the function to get the max pfn, so it can be used in the
> virtio-balloon device driver. Simply include the 'linux/bootmem.h'
> is not enough, if the device driver is built to a module, directly
> refer the max_pfn lead to build failed.

I'm not sure the rest of the set is worth reviewing.  I think a lot of
it will change pretty fundamentally once you have those improved data
structures in place.