diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 4f25ec0..9dc42c6 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -219,60 +219,13 @@ static void teardown_mcfg_map(struct pci_root_info *info)
 #endif
 
 static acpi_status
-resource_to_addr(struct acpi_resource *resource,
-			struct acpi_resource_address64 *addr)
-{
-	acpi_status status;
-	struct acpi_resource_memory24 *memory24;
-	struct acpi_resource_memory32 *memory32;
-	struct acpi_resource_fixed_memory32 *fixed_memory32;
-
-	memset(addr, 0, sizeof(*addr));
-	switch (resource->type) {
-	case ACPI_RESOURCE_TYPE_MEMORY24:
-		memory24 = &resource->data.memory24;
-		addr->resource_type = ACPI_MEMORY_RANGE;
-		addr->minimum = memory24->minimum;
-		addr->address_length = memory24->address_length;
-		addr->maximum = addr->minimum + addr->address_length - 1;
-		return AE_OK;
-	case ACPI_RESOURCE_TYPE_MEMORY32:
-		memory32 = &resource->data.memory32;
-		addr->resource_type = ACPI_MEMORY_RANGE;
-		addr->minimum = memory32->minimum;
-		addr->address_length = memory32->address_length;
-		addr->maximum = addr->minimum + addr->address_length - 1;
-		return AE_OK;
-	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
-		fixed_memory32 = &resource->data.fixed_memory32;
-		addr->resource_type = ACPI_MEMORY_RANGE;
-		addr->minimum = fixed_memory32->address;
-		addr->address_length = fixed_memory32->address_length;
-		addr->maximum = addr->minimum + addr->address_length - 1;
-		return AE_OK;
-	case ACPI_RESOURCE_TYPE_ADDRESS16:
-	case ACPI_RESOURCE_TYPE_ADDRESS32:
-	case ACPI_RESOURCE_TYPE_ADDRESS64:
-		status = acpi_resource_to_address64(resource, addr);
-		if (ACPI_SUCCESS(status) &&
-		    (addr->resource_type == ACPI_MEMORY_RANGE ||
-		    addr->resource_type == ACPI_IO_RANGE) &&
-		    addr->address_length > 0) {
-			return AE_OK;
-		}
-		break;
-	}
-	return AE_ERROR;
-}
-
-static acpi_status
 count_resource(struct acpi_resource *acpi_res, void *data)
 {
 	struct pci_root_info *info = data;
 	struct acpi_resource_address64 addr;
 	acpi_status status;
 
-	status = resource_to_addr(acpi_res, &addr);
+	status = acpi_mem_addr_resource_to_address64(acpi_res, &addr);
 	if (ACPI_SUCCESS(status))
 		info->res_num++;
 	return AE_OK;
@@ -288,7 +241,7 @@ setup_resource(struct acpi_resource *acpi_res, void *data)
 	unsigned long flags;
 	u64 start, orig_end, end;
 
-	status = resource_to_addr(acpi_res, &addr);
+	status = acpi_mem_addr_resource_to_address64(acpi_res, &addr);
 	if (!ACPI_SUCCESS(status))
 		return AE_OK;
 
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index b7201fc..6199ddf 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -414,6 +414,52 @@ void acpi_dev_free_resource_list(struct list_head *list)
 }
 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
 
+acpi_status acpi_mem_addr_resource_to_address64(struct acpi_resource *resource,
+			struct acpi_resource_address64 *addr)
+{
+	acpi_status status;
+	struct acpi_resource_memory24 *memory24;
+	struct acpi_resource_memory32 *memory32;
+	struct acpi_resource_fixed_memory32 *fixed_memory32;
+
+	memset(addr, 0, sizeof(*addr));
+	switch (resource->type) {
+	case ACPI_RESOURCE_TYPE_MEMORY24:
+		memory24 = &resource->data.memory24;
+		addr->resource_type = ACPI_MEMORY_RANGE;
+		addr->minimum = memory24->minimum;
+		addr->address_length = memory24->address_length;
+		addr->maximum = addr->minimum + addr->address_length - 1;
+		return AE_OK;
+	case ACPI_RESOURCE_TYPE_MEMORY32:
+		memory32 = &resource->data.memory32;
+		addr->resource_type = ACPI_MEMORY_RANGE;
+		addr->minimum = memory32->minimum;
+		addr->address_length = memory32->address_length;
+		addr->maximum = addr->minimum + addr->address_length - 1;
+		return AE_OK;
+	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+		fixed_memory32 = &resource->data.fixed_memory32;
+		addr->resource_type = ACPI_MEMORY_RANGE;
+		addr->minimum = fixed_memory32->address;
+		addr->address_length = fixed_memory32->address_length;
+		addr->maximum = addr->minimum + addr->address_length - 1;
+		return AE_OK;
+	case ACPI_RESOURCE_TYPE_ADDRESS16:
+	case ACPI_RESOURCE_TYPE_ADDRESS32:
+	case ACPI_RESOURCE_TYPE_ADDRESS64:
+		status = acpi_resource_to_address64(resource, addr);
+		if (ACPI_SUCCESS(status) &&
+		    (addr->resource_type == ACPI_MEMORY_RANGE ||
+		    addr->resource_type == ACPI_IO_RANGE) &&
+		    addr->address_length > 0) {
+			return AE_OK;
+		}
+		break;
+	}
+	return AE_ERROR;
+}
+
 struct res_proc_context {
 	struct list_head *list;
 	int (*preproc)(struct acpi_resource *, void *);
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ee8058e..762980a 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -293,6 +293,9 @@ unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable);
 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 				 struct resource *res);
 
+acpi_status acpi_mem_addr_resource_to_address64(struct acpi_resource *resource,
+			struct acpi_resource_address64 *addr);
+
 struct resource_list_entry {
 	struct list_head node;
 	struct resource res;
