[PATCH 02/17] mmzone: add various zone_*() helper functions.

[Cody P Schafer <cody@linux.vnet.ibm.com>]

From: Cody P Schafer <jmesmon@gmail.com>

Add zone_is_initialized(), zone_is_empty(), zone_spans_pfn(), and
zone_end_pfn().

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
---
 include/linux/mmzone.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 73b64a3..696cb7c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -543,6 +543,26 @@ static inline int zone_is_oom_locked(const struct zone *zone)
 	return test_bit(ZONE_OOM_LOCKED, &zone->flags);
 }
 
+static inline unsigned zone_end_pfn(const struct zone *zone)
+{
+	return zone->zone_start_pfn + zone->spanned_pages;
+}
+
+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
-- 
1.8.0.3

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