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-rw-r--r--include/linux/mmzone.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index ac00e2050943..d94347737292 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -319,7 +319,11 @@ enum zone_type {
ZONE_HIGHMEM,
#endif
ZONE_MOVABLE,
+#ifdef CONFIG_ZONE_DEVICE
+ ZONE_DEVICE,
+#endif
__MAX_NR_ZONES
+
};
#ifndef __GENERATING_BOUNDS_H
@@ -786,6 +790,25 @@ static inline bool pgdat_is_empty(pg_data_t *pgdat)
return !pgdat->node_start_pfn && !pgdat->node_spanned_pages;
}
+static inline int zone_id(const struct zone *zone)
+{
+ struct pglist_data *pgdat = zone->zone_pgdat;
+
+ return zone - pgdat->node_zones;
+}
+
+#ifdef CONFIG_ZONE_DEVICE
+static inline bool is_dev_zone(const struct zone *zone)
+{
+ return zone_id(zone) == ZONE_DEVICE;
+}
+#else
+static inline bool is_dev_zone(const struct zone *zone)
+{
+ return false;
+}
+#endif
+
#include <linux/memory_hotplug.h>
extern struct mutex zonelists_mutex;