X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=mm%2Fmmzone.c;h=f5b7d1760213e53db3c46e84dde56daf219ea0cd;hb=99e97b860e14c64760855198e91d1166697131a7;hp=16ce8b955dcff121623fc14810a9f12999f7ea3d;hpb=9c38c7e573ec44e4a10f735c048b40eb00ccc29c;p=~andy%2Flinux

diff --git a/mm/mmzone.c b/mm/mmzone.c
index 16ce8b955dc..f5b7d176021 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -6,6 +6,7 @@
 
 
 #include <linux/stddef.h>
+#include <linux/mm.h>
 #include <linux/mmzone.h>
 #include <linux/module.h>
 
@@ -72,3 +73,17 @@ struct zoneref *next_zones_zonelist(struct zoneref *z,
 	*zone = zonelist_zone(z);
 	return z;
 }
+
+#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
+int memmap_valid_within(unsigned long pfn,
+					struct page *page, struct zone *zone)
+{
+	if (page_to_pfn(page) != pfn)
+		return 0;
+
+	if (page_zone(page) != zone)
+		return 0;
+
+	return 1;
+}
+#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */