1 files changed, 65 insertions, 0 deletions
diff --git a/scripts/checkconfig.pl b/scripts/checkconfig.pl
new file mode 100755
index 000000000000..ca1f231b15a6
--- /dev/null
+++ b/scripts/checkconfig.pl
@@ -0,0 +1,65 @@
+#! /usr/bin/perl
+#
+# checkconfig: find uses of CONFIG_* names without matching definitions.
+# Copyright abandoned, 1998, Michael Elizabeth Chastain <mailto:mec@shout.net>.
+
+use integer;
+
+$| = 1;
+
+foreach $file (@ARGV)
+{
+    # Open this file.
+    open(FILE, $file) || die "Can't open $file: $!\n";
+
+    # Initialize variables.
+    my $fInComment   = 0;
+    my $fInString    = 0;
+    my $fUseConfig   = 0;
+    my $iLinuxConfig = 0;
+    my %configList   = ();
+
+    LINE: while ( <FILE> )
+    {
+	# Strip comments.
+	$fInComment && (s+^.*?\*/+ +o ? ($fInComment = 0) : next);
+	m+/\*+o && (s+/\*.*?\*/+ +go, (s+/\*.*$+ +o && ($fInComment = 1)));
+
+	# Pick up definitions.
+	if ( m/^\s*#/o )
+	{
+	    $iLinuxConfig      = $. if m/^\s*#\s*include\s*"linux\/config\.h"/o;
+	    $configList{uc $1} = 1  if m/^\s*#\s*include\s*"config\/(\S*)\.h"/o;
+	}
+
+	# Strip strings.
+	$fInString && (s+^.*?"+ +o ? ($fInString = 0) : next);
+	m+"+o && (s+".*?"+ +go, (s+".*$+ +o && ($fInString = 1)));
+
+	# Pick up definitions.
+	if ( m/^\s*#/o )
+	{
+	    $iLinuxConfig      = $. if m/^\s*#\s*include\s*<linux\/config\.h>/o;
+	    $configList{uc $1} = 1  if m/^\s*#\s*include\s*<config\/(\S*)\.h>/o;
+	    $configList{$1}    = 1  if m/^\s*#\s*define\s+CONFIG_(\w*)/o;
+	    $configList{$1}    = 1  if m/^\s*#\s*undef\s+CONFIG_(\w*)/o;
+	}
+
+	# Look for usages.
+	next unless m/CONFIG_/o;
+	WORD: while ( m/\bCONFIG_(\w+)/og )
+	{
+	    $fUseConfig = 1;
+	    last LINE if $iLinuxConfig;
+	    next WORD if exists $configList{$1};
+	    print "$file: $.: need CONFIG_$1.\n";
+	    $configList{$1} = 0;
+	}
+    }
+
+    # Report superfluous includes.
+    if ( $iLinuxConfig && ! $fUseConfig )
+	{ print "$file: $iLinuxConfig: linux/config.h not needed.\n"; }
+
+    close(FILE);
+}