v4.19.13 snapshot.
diff --git a/scripts/checkincludes.pl b/scripts/checkincludes.pl
new file mode 100755
index 0000000..b514a95
--- /dev/null
+++ b/scripts/checkincludes.pl
@@ -0,0 +1,98 @@
+#!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
+#
+# checkincludes: find/remove files included more than once
+#
+# Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
+# Copyright 2009 Luis R. Rodriguez <mcgrof@gmail.com>
+#
+# This script checks for duplicate includes. It also has support
+# to remove them in place. Note that this will not take into
+# consideration macros so you should run this only if you know
+# you do have real dups and do not have them under #ifdef's. You
+# could also just review the results.
+
+use strict;
+
+sub usage {
+ print "Usage: checkincludes.pl [-r]\n";
+ print "By default we just warn of duplicates\n";
+ print "To remove duplicated includes in place use -r\n";
+ exit 1;
+}
+
+my $remove = 0;
+
+if ($#ARGV < 0) {
+ usage();
+}
+
+if ($#ARGV >= 1) {
+ if ($ARGV[0] =~ /^-/) {
+ if ($ARGV[0] eq "-r") {
+ $remove = 1;
+ shift;
+ } else {
+ usage();
+ }
+ }
+}
+
+my $dup_counter = 0;
+
+foreach my $file (@ARGV) {
+ open(my $f, '<', $file)
+ or die "Cannot open $file: $!.\n";
+
+ my %includedfiles = ();
+ my @file_lines = ();
+
+ while (<$f>) {
+ if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
+ ++$includedfiles{$1};
+ }
+ push(@file_lines, $_);
+ }
+
+ close($f);
+
+ if (!$remove) {
+ foreach my $filename (keys %includedfiles) {
+ if ($includedfiles{$filename} > 1) {
+ print "$file: $filename is included more than once.\n";
+ ++$dup_counter;
+ }
+ }
+ next;
+ }
+
+ open($f, '>', $file)
+ or die("Cannot write to $file: $!");
+
+ my $dups = 0;
+ foreach (@file_lines) {
+ if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
+ foreach my $filename (keys %includedfiles) {
+ if ($1 eq $filename) {
+ if ($includedfiles{$filename} > 1) {
+ $includedfiles{$filename}--;
+ $dups++;
+ ++$dup_counter;
+ } else {
+ print {$f} $_;
+ }
+ }
+ }
+ } else {
+ print {$f} $_;
+ }
+ }
+ if ($dups > 0) {
+ print "$file: removed $dups duplicate includes\n";
+ }
+ close($f);
+}
+
+if ($dup_counter == 0) {
+ print "No duplicate includes found.\n";
+}