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Date: Tue, 15 Jan 2013 17:20:27 -0800
From: Dave Hansen <dave@linux.vnet.ibm.com>
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To: Cody P Schafer <cody@linux.vnet.ibm.com>
CC: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Cody P Schafer <jmesmon@gmail.com>
Subject: Re: [PATCH 02/17] mmzone: add various zone_*() helper functions.
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On 01/15/2013 04:24 PM, Cody P Schafer wrote:
> +static inline bool zone_is_empty(struct zone *zone)
> +{
> +	return zone->spanned_pages == 0;
> +}

Why did you choose spanned_pages for this?