diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c
index d3a2b81..639fce46 100644
--- a/arch/s390/mm/gup.c
+++ b/arch/s390/mm/gup.c
@@ -180,7 +180,7 @@
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
 	end = start + len;
-	if ((end < start) || (end > TASK_SIZE))
+	if ((end <= start) || (end > TASK_SIZE))
 		return 0;
 	/*
 	 * local_irq_save() doesn't prevent pagetable teardown, but does