diff --git a/arch/arc/include/asm/spinlock.h b/arch/arc/include/asm/spinlock.h
index 968c730ef114..193c9eb5a803 100644
--- a/arch/arc/include/asm/spinlock.h
+++ b/arch/arc/include/asm/spinlock.h
@@ -252,9 +252,15 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
 
 	__asm__ __volatile__(
 	"1:	ex  %0, [%1]		\n"
+#ifdef CONFIG_EZNPS_MTM_EXT
+	"	.word %3		\n"
+#endif
 	"	breq  %0, %2, 1b	\n"
 	: "+&r" (val)
 	: "r"(&(lock->slock)), "ir"(__ARCH_SPIN_LOCK_LOCKED__)
+#ifdef CONFIG_EZNPS_MTM_EXT
+	, "i"(CTOP_INST_SCHD_RW)
+#endif
 	: "memory");
 
 	/*