checkpatch: validate SPDX license with spdxcheck.py

Use the existing scripts/spdxcheck.py to validate any
SPDX-License-Identifier found in line 1 or 2 of patches or files.

Miscellanea:

o Properly indent the existing SPDX-License-Identifier block.

Link: http://lkml.kernel.org/r/05b832407b24e0a27e419906187cd863bc1617c7.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Rob Herring <robh@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 2 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34e4683de7a3..4523dd6d0476 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -849,6 +849,16 @@ sub is_maintained_obsolete {
         return $status =~ /obsolete/i;
 }
 
+sub is_SPDX_License_valid {
+        my ($license) = @_;
+
+        return 1 if (!$tree || which("python") eq "" || !(-e "$root/scripts/spdxcheck.py"));
+
+        my $status = `echo "$license" | python $root/scripts/spdxcheck.py -`;
+        return 0 if ($status ne "");
+        return 1;
+}
+
 my $camelcase_seeded = 0;
 sub seed_camelcase_includes {
         return if ($camelcase_seeded);
@@ -2978,8 +2988,14 @@ sub process {
 
                                 if ($comment !~ /^$/ &&
                                     $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
-                                        WARN("SPDX_LICENSE_TAG",
-                                             "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
+                                         WARN("SPDX_LICENSE_TAG",
+                                              "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
+                                } elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
+                                         my $spdx_license = $1;
+                                         if (!is_SPDX_License_valid($spdx_license)) {
+                                                  WARN("SPDX_LICENSE_TAG",
+                                                       "'$spdx_license' is not supported in LICENSES/...\n" . $herecurr);
+                                         }
                                 }
                         }
                 }