diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index ce8ffb595a46..df7cab870be5 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -3,7 +3,8 @@
  * Copyright 2012 by Oracle Inc
  * Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
  *
- * This code borrows ideas from https://lkml.org/lkml/2011/11/30/249
+ * This code borrows ideas from
+ * https://lore.kernel.org/lkml/1322673664-14642-6-git-send-email-konrad.wilk@oracle.com
  * so many thanks go to Kevin Tian <kevin.tian@intel.com>
  * and Yu Ke <ke.yu@intel.com>.
  */