Subject: Re: [RESEND PATCH v3 kernel 3/7] mm: add a function to get the max
 pfn
To: Liang Li <liang.z.li@intel.com>, mst@redhat.com
References: <1477031080-12616-1-git-send-email-liang.z.li@intel.com>
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Cc: linux-kernel@vger.kernel.org,
        virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
        kvm@vger.kernel.org, qemu-devel@nongnu.org, quintela@redhat.com,
        dgilbert@redhat.com, pbonzini@redhat.com, cornelia.huck@de.ibm.com,
        amit.shah@redhat.com, Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@techsingularity.net>
From: Dave Hansen <dave.hansen@intel.com>
Message-ID: <580E3C76.3010205@intel.com>
Date: Mon, 24 Oct 2016 09:53:10 -0700
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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.