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Date: Tue, 27 Feb 2018 16:03:19 -0800
From: "Zhao, Weiming" <>
Subject: clz instruction is unavailable for Thumb1

In arch/arm/atomic_arch.h, it checks for __ARM_ARCH >= 5, which is not 

for example, for armv6-m, it only support Thumb1, which doesn't include clz.

Suggest to check if it's building for thumb1:

diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h
index c5c56f8..e3cb66a 100644
--- a/arch/arm/atomic_arch.h
+++ b/arch/arm/atomic_arch.h
@@ -82,7 +82,7 @@ static inline void a_crash()
                 : : : "memory");

-#if __ARM_ARCH >= 5
+#if __ARM_ARCH >= 5 && !(defined(__thumb__) && !defined(__thumb2))

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