Ted! As you might know we are working on cleaning up the licensing mess in the kernel and convert it to SPDX license identifiers as the only source of license information. Archaeology found unspecific GPL license references, which have been authored by you. 1) redistribution of this file is permitted under the terms of the gnu public license (gpl) include/linux/serial.h https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=d9723f6c7080c Can you please either send cleanup patches for the affected files or indicate which GPLv2 variant you had in mind and I run it through my cleanup machinery. Thanks, Thomas