Re: [PATCH v1] checkpatch: add missing bindings license check

[Joe Perches]

On Fri, 2023-03-17 at 23:16 +0300, Dmitry Rokosov wrote:
> All headers from 'include/dt-bindings/' must be verified by checkpatch
> together with Documentation bindings, because all of them are part of
> the whole DT bindings system.
> 
> The requirement is dual licensed and matching string:
>     'GPL-2.0-only OR BSD-2-Clause'
> 
> The issue was found during patch review:
> https://lore.kernel.org/all/20230313201259.19998-4-ddrokosov@xxxxxxxxxxxxxx/
> 
> Signed-off-by: Dmitry Rokosov <ddrokosov@xxxxxxxxxxxxxx>
> ---
>  scripts/checkpatch.pl | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -3709,7 +3709,8 @@ sub process {
>  						WARN("SPDX_LICENSE_TAG",
>  						     "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
>  					}
> -					if ($realfile =~ m@^Documentation/devicetree/bindings/@ &&
> +					if (($realfile =~ m@^Documentation/devicetree/bindings/@ ||
> +					    $realfile =~ m@^include/dt-bindings/@) &&

I prefer aligning to open parens

>  					    not $spdx_license =~ /GPL-2\.0.*BSD-2-Clause/) {

And if it's really a strict bit about the required license,
why not make it match exactly?

 					    $spdx_license !~ /GPL-2\.0(?:-only|-or-later|\+)? OR BSD-2-Clause/) {

>  						my $msg_level = \&WARN;
>  						$msg_level = \&CHK if ($file);

$ git grep -oh 'SPDX-License.*$' -- Documentation/devicetree/bindings/ include/dt-bindings/ | \
  sort | uniq -c | sort -rn
   1597 SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    611 SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    540 SPDX-License-Identifier: GPL-2.0
    355 SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
    285 SPDX-License-Identifier: GPL-2.0 */
    179 SPDX-License-Identifier: GPL-2.0-only */
    102 SPDX-License-Identifier: GPL-2.0-only
     93 SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
     56 SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause
     47 SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
     36 SPDX-License-Identifier: GPL-2.0+ */
     34 SPDX-License-Identifier: GPL-2.0-or-later */
     33 SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
     28 SPDX-License-Identifier: GPL-2.0+
     21 SPDX-License-Identifier: (GPL-2.0+ OR MIT)
     19 SPDX-License-Identifier: (GPL-2.0+ or MIT) */
     17 SPDX-License-Identifier: (GPL-2.0 OR MIT) */
     12 SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
     11 SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
      9 SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
      8 SPDX-License-Identifier: GPL-2.0 OR MIT */
      8 SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
      7 SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
      7 SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
      7 SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
      6 SPDX-License-Identifier: (GPL-2.0)
      5 SPDX-License-Identifier: GPL-2.0+ OR MIT */
      5 SPDX-License-Identifier: (GPL-2.0 OR MIT)
      5 SPDX-License-Identifier: (GPL-2.0 or MIT) */
      4 SPDX-License-Identifier: GPL-2.0-or-later
      3 SPDX-License-Identifier: (GPL-2.0+ OR X11)
      3 SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
      3 SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
      3 SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
      3 SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause) */
      3 SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
      3 SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
      2 SPDX-License-Identifier: (GPL-2.0+ or MIT)
      2 SPDX-License-Identifier: GPL-2.0-or-later OR MIT */
      2 SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
      2 SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
      2 SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)*/
      1 SPDX-License-Identifier: (GPL-2.0-or-later OR MIT) */
      1 SPDX-License-Identifier: (GPL-2.0-or-later or MIT) */
      1 SPDX-License-Identifier: GPL-2.0-or-later or BSD-2-Clause */
      1 SPDX-License-Identifier: (GPL-2.0-or-later)
      1 SPDX-License-Identifier: GPL-2.0+ or BSD-3-Clause */
      1 SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
      1 SPDX-License-Identifier: GPL-2.0-only or X11 */
      1 SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
      1 SPDX-License-Identifier: GPL-2.0-only or BSD-2-Clause */
      1 SPDX-License-Identifier: (GPL-2.0-only)
      1 SPDX-License-Identifier: BSD-2-Clause