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);
+}