@@ -20,6 +20,7 @@ struct resource {
 	resource_size_t end;
 	const char *name;
 	unsigned long flags;
+	unsigned long desc;
 	struct resource *parent, *sibling, *child;
 };
 

@@ -112,6 +113,22 @@ struct resource {
 /* PCI control bits.  Shares IORESOURCE_BITS with above PCI ROM.  */
 #define IORESOURCE_PCI_FIXED		(1<<4)	/* Do not move resource */
 
+/*
+ * I/O Resource Descriptors
+ *
+ * Descriptors are used by walk_iomem_res_desc() and region_intersects()
+ * for searching a specific resource range in the iomem table.  Assign
+ * a new descriptor when a resource range supports the search interfaces.
+ * Otherwise, resource.desc must be set to IORES_DESC_NONE (0).
+ */
+enum {
+	IORES_DESC_NONE				= 0,
+	IORES_DESC_CRASH_KERNEL			= 1,
+	IORES_DESC_ACPI_TABLES			= 2,
+	IORES_DESC_ACPI_NV_STORAGE		= 3,
+	IORES_DESC_PERSISTENT_MEMORY		= 4,
+	IORES_DESC_PERSISTENT_MEMORY_LEGACY	= 5,
+};
 
 /* helpers to define resources */
 #define DEFINE_RES_NAMED(_start, _size, _name, _flags)			\

@@ -120,6 +137,7 @@ struct resource {
 		.end = (_start) + (_size) - 1,				\
 		.name = (_name),					\
 		.flags = (_flags),					\
+		.desc = IORES_DESC_NONE,				\
 	}
 
 #define DEFINE_RES_IO_NAMED(_start, _size, _name)			\

@@ -949,6 +949,7 @@ static void __init __reserve_region_with_split(struct resource *root,
 	res->start = start;
 	res->end = end;
 	res->flags = IORESOURCE_BUSY;
+	res->desc = IORES_DESC_NONE;
 
 	while (1) {
 

@@ -983,6 +984,7 @@ static void __init __reserve_region_with_split(struct resource *root,
 				next_res->start = conflict->end + 1;
 				next_res->end = end;
 				next_res->flags = IORESOURCE_BUSY;
+				next_res->desc = IORES_DESC_NONE;
 			}
 		} else {
 			res->start = conflict->end + 1;

@@ -1074,6 +1076,7 @@ struct resource * __request_region(struct resource *parent,
 	res->end = start + n - 1;
 	res->flags = resource_type(parent) | resource_ext_type(parent);
 	res->flags |= IORESOURCE_BUSY | flags;
+	res->desc = IORES_DESC_NONE;
 
 	write_lock(&resource_lock);
 

@@ -1238,6 +1241,7 @@ int release_mem_region_adjustable(struct resource *parent,
 			new_res->start = end + 1;
 			new_res->end = res->end;
 			new_res->flags = res->flags;
+			new_res->desc = res->desc;
 			new_res->parent = res->parent;
 			new_res->sibling = res->sibling;
 			new_res->child = NULL;

@@ -1413,6 +1417,7 @@ static int __init reserve_setup(char *str)
 			res->start = io_start;
 			res->end = io_start + io_num - 1;
 			res->flags = IORESOURCE_BUSY;
+			res->desc = IORES_DESC_NONE;
 			res->child = NULL;
 			if (request_resource(res->start >= 0x10000 ? &iomem_resource : &ioport_resource, res) == 0)
 				reserved = x+1;

--