diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
index fc9682bfe0020caebf99412131fb760d5b8b870d..aac64d55cb22eb9cb7a166e823ef1a4d27c3b4f1 100644
--- a/arch/arm64/include/asm/spinlock.h
+++ b/arch/arm64/include/asm/spinlock.h
@@ -31,6 +31,12 @@ static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
 	unsigned int tmp;
 	arch_spinlock_t lockval;
 
+	/*
+	 * Ensure prior spin_lock operations to other locks have completed
+	 * on this CPU before we test whether "lock" is locked.
+	 */
+	smp_mb();
+
 	asm volatile(
 "	sevl\n"
 "1:	wfe\n"
@@ -148,6 +154,7 @@ static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
 
 static inline int arch_spin_is_locked(arch_spinlock_t *lock)
 {
+	smp_mb(); /* See arch_spin_unlock_wait */
 	return !arch_spin_value_unlocked(READ_ONCE(*lock));
 }