checkpatch: emit a warning on file add/move/delete

Whenever files are added, moved, or deleted, the MAINTAINERS file
patterns can be out of sync or outdated.

To try to keep MAINTAINERS more up-to-date, add a one-time warning
whenever a patch does any of those.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20180430124651.10340-5-stefanha@redhat.com
(cherry picked from commit 13f1937ef33950b1112049972249e6191b82e6c9)
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Conflicts:
  QEMU WARN() only takes one argument, drop the 'type' value in the
  first argument.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 20d5b62..84bdf53 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1185,7 +1185,7 @@ sub process {
 
        my $in_header_lines = $file ? 0 : 1;
        my $in_commit_log = 0;          #Scanning lines before patch
-
+       my $reported_maintainer_file = 0;
        my $non_utf8_charset = 0;
 
        our @report = ();
@@ -1390,6 +1390,16 @@ sub process {
                        }
                }
 
+# Check for added, moved or deleted files
+               if (!$reported_maintainer_file && !$in_commit_log &&
+                   ($line =~ /^(?:new|deleted) file mode\s*\d+\s*$/ ||
+                    $line =~ /^rename (?:from|to) [\w\/\.\-]+\s*$/ ||
+                    ($line =~ /\{\s*([\w\/\.\-]*)\s*\=\>\s*([\w\/\.\-]*)\s*\}/ &&
+                     (defined($1) || defined($2))))) {
+                       $reported_maintainer_file = 1;
+                       WARN("added, moved or deleted file(s), does MAINTAINERS need updating?\n" . $herecurr);
+               }
+
 # Check for wrappage within a valid hunk of the file
                if ($realcnt != 0 && $line !~ m{^(?:\+|-| |\\ No newline|$)}) {
                        ERROR("patch seems to be corrupt (line wrapped?)\n" .