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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 34343f5..cf89259 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -537,6 +537,16 @@
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