[PATCH 1/4] license: add exception for Linux Kernel uAPI headers

[Maxime Coquelin <maxime.coquelin@redhat.com>]

As approved by both Technical and Governing boards, Linux
Kernel uAPI header files can now be imported into the
kernel/linux/uapi directory.

This patch also fix the SPDX tags checker script to take
into account dual-licensed files.

The process to import such headers is documented in
doc/guides/contributing/linux_uapi.rst

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 devtools/check-spdx-tag.sh |  2 +-
 license/Linux-syscall-note | 25 +++++++++++++++++++++++++
 license/exceptions.txt     | 17 +++++++++--------
 3 files changed, 35 insertions(+), 9 deletions(-)
 create mode 100644 license/Linux-syscall-note

diff --git a/devtools/check-spdx-tag.sh b/devtools/check-spdx-tag.sh
index 1fd0d579d3..984825026e 100755
--- a/devtools/check-spdx-tag.sh
+++ b/devtools/check-spdx-tag.sh
@@ -48,7 +48,7 @@ check_licenses() {
     fi
     exceptions=$(build_exceptions_list)
     git grep -l SPDX-License-Identifier: -- $no_license_list $exceptions |
-    xargs grep -L -E 'SPDX-License-Identifier:[[:space:]]*\(?BSD-3-Clause' > $tmpfile
+    xargs grep -L -E 'SPDX-License-Identifier:[[:space:]]*(\(?|.* OR )BSD-3-Clause' > $tmpfile
 
     wrong_license=$(wc -l < $tmpfile)
     $quiet || cat $tmpfile
diff --git a/license/Linux-syscall-note b/license/Linux-syscall-note
new file mode 100644
index 0000000000..9abdad71fa
--- /dev/null
+++ b/license/Linux-syscall-note
@@ -0,0 +1,25 @@
+SPDX-Exception-Identifier: Linux-syscall-note
+SPDX-URL: https://spdx.org/licenses/Linux-syscall-note.html
+SPDX-Licenses: GPL-2.0, GPL-2.0+, GPL-1.0+, LGPL-2.0, LGPL-2.0+, LGPL-2.1, LGPL-2.1+, GPL-2.0-only, GPL-2.0-or-later
+Usage-Guide:
+  This exception is used together with one of the above SPDX-Licenses
+  to mark user space API (uapi) header files so they can be included
+  into non GPL compliant user space application code.
+  To use this exception add it with the keyword WITH to one of the
+  identifiers in the SPDX-Licenses tag:
+    SPDX-License-Identifier: <SPDX-License> WITH Linux-syscall-note
+License-Text:
+
+   NOTE! This copyright does *not* cover user programs that use kernel
+ services by normal system calls - this is merely considered normal use
+ of the kernel, and does *not* fall under the heading of "derived work".
+ Also note that the GPL below is copyrighted by the Free Software
+ Foundation, but the instance of code that it refers to (the Linux
+ kernel) is copyrighted by me and others who actually wrote it.
+
+ Also note that the only valid version of the GPL as far as the kernel
+ is concerned is _this_ particular version of the license (ie v2, not
+ v2.2 or v3.x or whatever), unless explicitly otherwise stated.
+
+			Linus Torvalds
+
diff --git a/license/exceptions.txt b/license/exceptions.txt
index d12fac2034..cf2034747d 100644
--- a/license/exceptions.txt
+++ b/license/exceptions.txt
@@ -9,11 +9,12 @@ Note that following licenses are not exceptions:-
 	- BSD-3-Clause OR LGPL-2.1
 	- GPL-2.0  (*Only for kernel code*)
 
----------------------------------------------------------------------------------------------------
-SPDX Identifier      | TB Approval Date | GB Approval Date | File name
----------------------------------------------------------------------------------------------------
-MIT                  | 10/23/2019       | 02/10/2020       | lib/eal/windows/include/dirent.h
-BSD-2-Clause         | 10/23/2019       | 12/18/2019       | lib/eal/windows/include/getopt.h
-ISC AND BSD-2-Clause | 10/23/2019       | 12/18/2019       | lib/eal/windows/getopt.c
-MIT                  | 10/19/2022       | 10/18/2022       | drivers/net/gve/base/*
----------------------------------------------------------------------------------------------------
+---------------------------------------------------------------------------------------------------------
+SPDX Identifier                 | TB Approval Date | GB Approval Date | File name
+---------------------------------------------------------------------------------------------------------
+MIT                             | 10/23/2019       | 02/10/2020       | lib/eal/windows/include/dirent.h
+BSD-2-Clause                    | 10/23/2019       | 12/18/2019       | lib/eal/windows/include/getopt.h
+ISC AND BSD-2-Clause            | 10/23/2019       | 12/18/2019       | lib/eal/windows/getopt.c
+MIT                             | 10/19/2022       | 10/18/2022       | drivers/net/gve/base/*
+GPL-2.0 WITH Linux-syscall-note | 12/11/2024       | 04/14/2025       | kernel/linux/uapi/linux/*
+---------------------------------------------------------------------------------------------------------
-- 
2.49.0