Add a SPDX identifier. The majority of the document has been written by
Ahmed S. Darwish.

Cc: Ahmed S. Darwish <darwi@linutronix.de>
Acked-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 Documentation/locking/seqlock.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/locking/seqlock.rst b/Documentation/locking/seqlock.rst
index ec6411d02ac8f..3fb7ea3ab22a6 100644
--- a/Documentation/locking/seqlock.rst
+++ b/Documentation/locking/seqlock.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: GPL-2.0
+
 ======================================
 Sequence counters and sequential locks
 ======================================
-- 
2.50.1