3 files changed, 6 insertions, 0 deletions
diff --git a/src/include/smp/atomic.h b/src/include/smp/atomic.h
index 5e78ae4462..18f83de52b 100644
--- a/src/include/smp/atomic.h
+++ b/src/include/smp/atomic.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef SMP_ATOMIC_H
 #define SMP_ATOMIC_H
 
diff --git a/src/include/smp/node.h b/src/include/smp/node.h
index 4dea175ea3..8f3d14fde1 100644
--- a/src/include/smp/node.h
+++ b/src/include/smp/node.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef _SMP_NODE_H_
 #define _SMP_NODE_H_
 
diff --git a/src/include/smp/spinlock.h b/src/include/smp/spinlock.h
index 0ca391d93c..90eae6bf0e 100644
--- a/src/include/smp/spinlock.h
+++ b/src/include/smp/spinlock.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #ifndef SMP_SPINLOCK_H
 #define SMP_SPINLOCK_H