diff --git a/[refs] b/[refs]
index 2e3668ed2ca1..1bd3e8380bdc 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ef4a47db52cd8c15b5de07a318e5758d2f1e1bb9
+refs/heads/master: bc41bb11654f7fbb8cae2d316a7c2ac5ebf759d2
diff --git a/trunk/arch/blackfin/kernel/process.c b/trunk/arch/blackfin/kernel/process.c
index de7d048bd4ee..9124467651c4 100644
--- a/trunk/arch/blackfin/kernel/process.c
+++ b/trunk/arch/blackfin/kernel/process.c
@@ -395,7 +395,8 @@ void finish_atomic_sections (struct pt_regs *regs)
 #if defined(CONFIG_ACCESS_CHECK)
 int _access_ok(unsigned long addr, unsigned long size)
 {
-
+	if (size == 0)
+		return 1;
 	if (addr > (addr + size))
 		return 0;
 	if (segment_eq(get_fs(), KERNEL_DS))