From 634d0b2d3681520b3b685d6663e9b14804798661 Mon Sep 17 00:00:00 2001
From: Cody P Schafer <cody@linux.vnet.ibm.com>
Date: Thu, 7 Feb 2013 12:27:05 +1100
Subject: [PATCH] mm: add zone_is_empty() and zone_is_initialized()

Factoring out these 2 checks makes it more clear what we are actually
checking for.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Hansen <dave@linux.vnet.ibm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/mmzone.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 34343f51e211..cf8925962b68 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -537,6 +537,16 @@ static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn)
 	return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone);
 }
 
+static inline bool zone_is_initialized(struct zone *zone)
+{
+	return !!zone->wait_table;
+}
+
+static inline bool zone_is_empty(struct zone *zone)
+{
+	return zone->spanned_pages == 0;
+}
+
 /*
  * The "priority" of VM scanning is how much of the queues we will scan in one
  * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
-- 
2.39.5