--- kernel_coding_style.md (r22)+++ kernel_coding_style.md (r23)@@ -14,6 +14,10 @@ Always use `checkpatch.pl` before submitting patches.+## SPDX headers++All new files must include an SPDX-License-Identifier header on line 1.+Example: `// SPDX-License-Identifier: GPL-2.0-only`+ ## Commit message format Use the standard Linux kernel commit format: subsystem: short description