There is a well defined list of expected values for MODULE_LICENSE so
warn the user upon usage of unknown values.

Signed-off-by: Bjorn Andersson <[email protected]>
---

Thanks for the review Joe!

"Proprietary" is in the list because this is the full list of "valid" values
mentioned in include/linux/module.h. So it's the list of licenses valid for
submission, but rather the list of valid values.

Changes since v1:
- Fixed nits pointed out by Joe
- Added comment to clarify the purpose, as well as origin of the values

 scripts/checkpatch.pl | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 9a8b2bd..ca10d79 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5431,6 +5431,24 @@ sub process {
                                }
                        }
                }
+
+# validate content of MODULE_LICENSE against list from include/linux/module.h
+               if ($line =~ /\bMODULE_LICENSE\s*\(\s*($String)\s*\)/) {
+                       my $extracted_string = get_quoted_string($line, 
$rawline);
+                       my $valid_licenses = qr{
+                                               GPL|
+                                               GPL\ v2|
+                                               GPL\ and\ additional\ rights|
+                                               Dual\ BSD/GPL|
+                                               Dual\ MIT/GPL|
+                                               Dual\ MPL/GPL|
+                                               Proprietary
+                                       }x;
+                       if ($extracted_string !~ /^"(?:$valid_licenses)"$/x) {
+                               WARN("MODULE_LICENSE",
+                                    "unknown module license " . 
$extracted_string . "\n" . $herecurr);
+                       }
+               }
        }
 
        # If we have no input at all, then there is nothing to report on
-- 
1.8.2.2

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