diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 6340cef..f974809 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -247,11 +247,16 @@
 	start &= PAGE_MASK;
 	addr = start;
 	len = (unsigned long) nr_pages << PAGE_SHIFT;
+
 	end = start + len;
-	if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ,
-					(void __user *)start, len)))
+	if (end < start)
 		goto slow_irqon;
 
+#ifdef CONFIG_X86_64
+	if (end >> __VIRTUAL_MASK_SHIFT)
+		goto slow_irqon;
+#endif
+
 	/*
 	 * XXX: batch / limit 'nr', to avoid large irq off latency
 	 * needs some instrumenting to determine the common sizes used by