xen/acpi: Move xen_acpi_get_pxm to Xen's acpi.h

So that it could be reused by Xen CPU hotplug logic.
Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/xen-acpi-memhotplug.c

@@ -65,24 +65,6 @@ static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info)
 	return rc;
 }
 
-static int xen_acpi_get_pxm(acpi_handle h)
-{
-	unsigned long long pxm;
-	acpi_status status;
-	acpi_handle handle;
-	acpi_handle phandle = h;
-
-	do {
-		handle = phandle;
-		status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
-		if (ACPI_SUCCESS(status))
-			return pxm;
-		status = acpi_get_parent(handle, &phandle);
-	} while (ACPI_SUCCESS(status));
-
-	return -ENXIO;
-}
-
 static int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 {
 	int pxm, result;

include/xen/acpi.h

@@ -69,4 +69,22 @@ static inline void xen_acpi_sleep_register(void)
 }
 #endif
 
+static inline int xen_acpi_get_pxm(acpi_handle h)
+{
+	unsigned long long pxm;
+	acpi_status status;
+	acpi_handle handle;
+	acpi_handle phandle = h;
+
+	do {
+		handle = phandle;
+		status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
+		if (ACPI_SUCCESS(status))
+			return pxm;
+		status = acpi_get_parent(handle, &phandle);
+	} while (ACPI_SUCCESS(status));
+
+	return -ENXIO;
+}
+
 #endif	/* _XEN_ACPI_H */