#! /usr/bin/perl## checkversion find uses of LINUX_VERSION_CODE or KERNEL_VERSION# without including <linux/version.h>, or cases of# including <linux/version.h> that don't need it.# Copyright (C) 2003, Randy Dunlap <rdunlap@xenotime.net> $| = 1; my $debugging = 0; foreach $file (@ARGV){    # Open this file.    open(FILE, $file) || die "Can't open $file: $!\n";     # Initialize variables.    my $fInComment   = 0;    my $fInString    = 0;    my $fUseVersion   = 0;    my $iLinuxVersion = 0;     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 ) {	    $iLinuxVersion      = $. if m/^\s*#\s*include\s*"linux\/version\.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 ) {	    $iLinuxVersion      = $. if m/^\s*#\s*include\s*<linux\/version\.h>/o;	} 	# Look for uses: LINUX_VERSION_CODE, KERNEL_VERSION, UTS_RELEASE	if (($_ =~ /LINUX_VERSION_CODE/) || ($_ =~ /\WKERNEL_VERSION/)) {	    $fUseVersion = 1;	    last LINE if $iLinuxVersion;	}    }     # Report used version IDs without include?    if ($fUseVersion && ! $iLinuxVersion) {	print "$file: $.: need linux/version.h\n";    }     # Report superfluous includes.    if ($iLinuxVersion && ! $fUseVersion) {	print "$file: $iLinuxVersion linux/version.h not needed.\n";    }     # debug: report OK results:    if ($debugging) {        if ($iLinuxVersion && $fUseVersion) {	    print "$file: version use is OK ($iLinuxVersion)\n";        }        if (! $iLinuxVersion && ! $fUseVersion) {	    print "$file: version use is OK (none)\n";        }    }     close(FILE);}