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diff --git a/include/atomic_t.h b/include/atomic_t.h
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+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* This file is to provide atomic_t definition */
+
+#ifndef __CROS_EC_ATOMIC_T_H
+#define __CROS_EC_ATOMIC_T_H
+
+#ifndef CONFIG_ZEPHYR
+#ifdef TEST_BUILD
+typedef int atomic_t;
+#else
+typedef long atomic_t;
+#endif
+typedef atomic_t atomic_val_t;
+#else
+#include <sys/atomic.h>
+#endif
+
+#endif /* __CROS_EC_ATOMIC_T_H */