checkpatch: see if modified files are marked obsolete in MAINTAINERS

Use get_maintainer to check the status of individual files.  If
"obsolete", suggest leaving the files alone.

Link: http://lkml.kernel.org/r/7ceaa510dc9d2df05ec4b456baed7bb1415550b3.1471889575.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: SF Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 206a6b346a8d..34b445574011 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -704,6 +704,16 @@ sub seed_camelcase_file {
         }
 }
 
+sub is_maintained_obsolete {
+        my ($filename) = @_;
+
+        return 0 if (!(-e "$root/scripts/get_maintainer.pl"));
+
+        my $status = `perl $root/scripts/get_maintainer.pl --status --nom --nol --nogit --nogit-fallback $filename 2>&1`;
+
+        return $status =~ /obsolete/i;
+}
+
 my $camelcase_seeded = 0;
 sub seed_camelcase_includes {
         return if ($camelcase_seeded);
@@ -2289,6 +2299,10 @@ sub process {
                 }
 
                 if ($found_file) {
+                        if (is_maintained_obsolete($realfile)) {
+                                WARN("OBSOLETE",
+                                     "$realfile is marked as 'obsolete' in the MAINTAINERS hierarchy.  No unnecessary modifications please.\n");
+                        }
                         if ($realfile =~ m@^(?:drivers/net/|net/|drivers/staging/)@) {
                                 $check = 1;
                         } else {