checkpatch: add warning for non-lore mailing list URLs

The lkml.org, marc.info, spinics.net, etc archives are not quite as useful
as lore.kernel.org because they use different styles, add advertising, and
may disappear in the future.  The lore archives are more consistent and
more likely to stick around, so prefer https://lore.kernel.org URLs when
they exist.

[[email protected]: only warn if we see "http" before the archive hostname]
  Link: https://lkml.kernel.org/r/20221114224315.GA939630@bhelgaas
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Peter Collingbourne <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Dwaipayan Ray <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Lukas Bulwahn <[email protected]>
Cc: Randy Dunlap <[email protected]> # build-tested
Cc: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1e5e66ae5a52..bd1b9d7a1647 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -702,6 +702,17 @@ sub find_standard_signature {
 	return "";
 }
 
+our $obsolete_archives = qr{(?xi:
+	\Qfreedesktop.org/archives/dri-devel\E |
+	\Qlists.infradead.org\E |
+	\Qlkml.org\E |
+	\Qmail-archive.com\E |
+	\Qmailman.alsa-project.org/pipermail\E |
+	\Qmarc.info\E |
+	\Qozlabs.org/pipermail\E |
+	\Qspinics.net\E
+)};
+
 our @typeListMisordered = (
 	qr{char\s+(?:un)?signed},
 	qr{int\s+(?:(?:un)?signed\s+)?short\s},
@@ -3324,6 +3335,12 @@ sub process {
 			$last_git_commit_id_linenr = $linenr if ($line =~ /\bcommit\s*$/i);
 		}
 
+# Check for mailing list archives other than lore.kernel.org
+		if ($rawline =~ m{http.*\b$obsolete_archives}) {
+			WARN("PREFER_LORE_ARCHIVE",
+			     "Use lore.kernel.org archive links when possible - see https://lore.kernel.org/lists.html\n" . $herecurr);
+		}
+
 # Check for added, moved or deleted files
 		if (!$reported_maintainer_file && !$in_commit_log &&
 		    ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||