scripts/kconfig/streamline_config.pl - kernel/mindspeed - Git at Google

 #!/usr/bin/perl -w
 #
 # Copyright 2005-2009 - Steven Rostedt
 # Licensed under the terms of the GNU GPL License version 2
 #
 #  It's simple enough to figure out how this works.
 #  If not, then you can ask me at stripconfig@goodmis.org
 #
 # What it does?
 #
 #   If you have installed a Linux kernel from a distribution
 #   that turns on way too many modules than you need, and
 #   you only want the modules you use, then this program
 #   is perfect for you.
 #
 #   It gives you the ability to turn off all the modules that are
 #   not loaded on your system.
 #
 # Howto:
 #
 #  1. Boot up the kernel that you want to stream line the config on.
 #  2. Change directory to the directory holding the source of the
 #       kernel that you just booted.
 #  3. Copy the configuraton file to this directory as .config
 #  4. Have all your devices that you need modules for connected and
 #      operational (make sure that their corresponding modules are loaded)
 #  5. Run this script redirecting the output to some other file
 #       like config_strip.
 #  6. Back up your old config (if you want too).
 #  7. copy the config_strip file to .config
 #  8. Run "make oldconfig"
 #
 #  Now your kernel is ready to be built with only the modules that
 #  are loaded.
 #
 # Here's what I did with my Debian distribution.
 #
 #    cd /usr/src/linux-2.6.10
 #    cp /boot/config-2.6.10-1-686-smp .config
 #    ~/bin/streamline_config > config_strip
 #    mv .config config_sav
 #    mv config_strip .config
 #    make oldconfig
 #
 use strict;
 use Getopt::Long;

 my $config = ".config";

 my $uname = `uname -r`;
 chomp $uname;

 my @searchconfigs = (
 	{
 	    "file" => ".config",
 	    "exec" => "cat",
 	},
 	{
 	    "file" => "/proc/config.gz",
 	    "exec" => "zcat",
 	},
 	{
 	    "file" => "/boot/config-$uname",
 	    "exec" => "cat",
 	},
 	{
 	    "file" => "/boot/vmlinuz-$uname",
 	    "exec" => "scripts/extract-ikconfig",
 	    "test" => "scripts/extract-ikconfig",
 	},
 	{
 	    "file" => "vmlinux",
 	    "exec" => "scripts/extract-ikconfig",
 	    "test" => "scripts/extract-ikconfig",
 	},
 	{
 	    "file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
 	    "exec" => "scripts/extract-ikconfig",
 	    "test" => "scripts/extract-ikconfig",
 	},
 	{
 	    "file" => "kernel/configs.ko",
 	    "exec" => "scripts/extract-ikconfig",
 	    "test" => "scripts/extract-ikconfig",
 	},
 	{
 	    "file" => "kernel/configs.o",
 	    "exec" => "scripts/extract-ikconfig",
 	    "test" => "scripts/extract-ikconfig",
 	},
 );

 sub find_config {
     foreach my $conf (@searchconfigs) {
 	my $file = $conf->{"file"};

 	next if ( ! -f "$file");

 	if (defined($conf->{"test"})) {
 	    `$conf->{"test"} $conf->{"file"} 2>/dev/null`;
 	    next if ($?);
 	}

 	my $exec = $conf->{"exec"};

 	print STDERR "using config: '$file'\n";

 	open(CIN, "$exec $file |") || die "Failed to run $exec $file";
 	return;
     }
     die "No config file found";
 }

 find_config;

 # Parse options
 my $localmodconfig = 0;
 my $localyesconfig = 0;

 GetOptions("localmodconfig" => \$localmodconfig,
 	   "localyesconfig" => \$localyesconfig);

 # Get the build source and top level Kconfig file (passed in)
 my $ksource = $ARGV[0];
 my $kconfig = $ARGV[1];
 my $lsmod_file = $ENV{'LSMOD'};

 my @makefiles = `find $ksource -name Makefile 2>/dev/null`;
 chomp @makefiles;

 my %depends;
 my %selects;
 my %prompts;
 my %objects;
 my $var;
 my $iflevel = 0;
 my @ifdeps;

 # prevent recursion
 my %read_kconfigs;

 sub read_kconfig {
     my ($kconfig) = @_;

     my $state = "NONE";
     my $config;
     my @kconfigs;

     my $cont = 0;
     my $line;

     my $source = "$ksource/$kconfig";
     my $last_source = "";

     # Check for any environment variables used
     while ($source =~ /\$(\w+)/ && $last_source ne $source) {
 	my $env = $1;
 	$last_source = $source;
 	$source =~ s/\$$env/$ENV{$env}/;
     }

     open(KIN, "$source") || die "Can't open $kconfig";
     while (<KIN>) {
 	chomp;

 	# Make sure that lines ending with \ continue
 	if ($cont) {
 	    $_ = $line . " " . $_;
 	}

 	if (s/\\$//) {
 	    $cont = 1;
 	    $line = $_;
 	    next;
 	}

 	$cont = 0;

 	# collect any Kconfig sources
 	if (/^source\s*"(.*)"/) {
 	    $kconfigs[$#kconfigs+1] = $1;
 	}

 	# configs found
 	if (/^\s*(menu)?config\s+(\S+)\s*$/) {
 	    $state = "NEW";
 	    $config = $2;

 	    for (my $i = 0; $i < $iflevel; $i++) {
 		if ($i) {
 		    $depends{$config} .= " " . $ifdeps[$i];
 		} else {
 		    $depends{$config} = $ifdeps[$i];
 		}
 		$state = "DEP";
 	    }

 	# collect the depends for the config
 	} elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
 	    $state = "DEP";
 	    $depends{$config} = $1;
 	} elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
 	    $depends{$config} .= " " . $1;

 	# Get the configs that select this config
 	} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
 	    if (defined($selects{$1})) {
 		$selects{$1} .= " " . $config;
 	    } else {
 		$selects{$1} = $config;
 	    }

 	# configs without prompts must be selected
 	} elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
 	    # note if the config has a prompt
 	    $prompts{$config} = 1;

 	# Check for if statements
 	} elsif (/^if\s+(.*\S)\s*$/) {
 	    my $deps = $1;
 	    # remove beginning and ending non text
 	    $deps =~ s/^[^a-zA-Z0-9_]*//;
 	    $deps =~ s/[^a-zA-Z0-9_]*$//;

 	    my @deps = split /[^a-zA-Z0-9_]+/, $deps;

 	    $ifdeps[$iflevel++] = join ':', @deps;

 	} elsif (/^endif/) {

 	    $iflevel-- if ($iflevel);

 	# stop on "help"
 	} elsif (/^\s*help\s*$/) {
 	    $state = "NONE";
 	}
     }
     close(KIN);

     # read in any configs that were found.
     foreach $kconfig (@kconfigs) {
 	if (!defined($read_kconfigs{$kconfig})) {
 	    $read_kconfigs{$kconfig} = 1;
 	    read_kconfig($kconfig);
 	}
     }
 }

 if ($kconfig) {
     read_kconfig($kconfig);
 }

 sub convert_vars {
     my ($line, %vars) = @_;

     my $process = "";

     while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
 	my $start = $1;
 	my $variable = $2;
 	my $var = $3;

 	if (defined($vars{$var})) {
 	    $process .= $start . $vars{$var};
 	} else {
 	    $process .= $start . $variable;
 	}
     }

     $process .= $line;

     return $process;
 }

 # Read all Makefiles to map the configs to the objects
 foreach my $makefile (@makefiles) {

     my $line = "";
     my %make_vars;

     open(MIN,$makefile) || die "Can't open $makefile";
     while (<MIN>) {
 	# if this line ends with a backslash, continue
 	chomp;
 	if (/^(.*)\\$/) {
 	    $line .= $1;
 	    next;
 	}

 	$line .= $_;
 	$_ = $line;
 	$line = "";

 	my $objs;

 	$_ = convert_vars($_, %make_vars);

 	# collect objects after obj-$(CONFIG_FOO_BAR)
 	if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
 	    $var = $1;
 	    $objs = $2;

 	# check if variables are set
 	} elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
 	    $make_vars{$1} = $2;
 	}
 	if (defined($objs)) {
 	    foreach my $obj (split /\s+/,$objs) {
 		$obj =~ s/-/_/g;
 		if ($obj =~ /(.*)\.o$/) {
 		    # Objects may be enabled by more than one config.
 		    # Store configs in an array.
 		    my @arr;

 		    if (defined($objects{$1})) {
 			@arr = @{$objects{$1}};
 		    }

 		    $arr[$#arr+1] = $var;

 		    # The objects have a hash mapping to a reference
 		    # of an array of configs.
 		    $objects{$1} = \@arr;
 		}
 	    }
 	}
     }
     close(MIN);
 }

 my %modules;

 if (defined($lsmod_file)) {
     if ( ! -f $lsmod_file) {
 	if ( -f $ENV{'objtree'}."/".$lsmod_file) {
 	    $lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
 	} else {
 		die "$lsmod_file not found";
 	}
     }
     if ( -x $lsmod_file) {
 	# the file is executable, run it
 	open(LIN, "$lsmod_file|");
     } else {
 	# Just read the contents
 	open(LIN, "$lsmod_file");
     }
 } else {

     # see what modules are loaded on this system
     my $lsmod;

     foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
 	if ( -x "$dir/lsmod" ) {
 	    $lsmod = "$dir/lsmod";
 	    last;
 	}
 }
     if (!defined($lsmod)) {
 	# try just the path
 	$lsmod = "lsmod";
     }

     open(LIN,"$lsmod|") || die "Can not call lsmod with $lsmod";
 }

 while (<LIN>) {
 	next if (/^Module/);  # Skip the first line.
 	if (/^(\S+)/) {
 		$modules{$1} = 1;
 	}
 }
 close (LIN);

 # add to the configs hash all configs that are needed to enable
 # a loaded module.
 my %configs;
 foreach my $module (keys(%modules)) {
     if (defined($objects{$module})) {
 	my @arr = @{$objects{$module}};
 	foreach my $conf (@arr) {
 	    $configs{$conf} = $module;
 	}
     } else {
 	# Most likely, someone has a custom (binary?) module loaded.
 	print STDERR "$module config not found!!\n";
     }
 }

 my $valid = "A-Za-z_0-9";
 my $repeat = 1;

 #
 # Note, we do not care about operands (like: &&, ||, !) we want to add any
 # config that is in the depend list of another config. This script does
 # not enable configs that are not already enabled. If we come across a
 # config A that depends on !B, we can still add B to the list of depends
 # to keep on. If A was on in the original config, B would not have been
 # and B would not be turned on by this script.
 #
 sub parse_config_dep_select
 {
     my ($p) = @_;

     while ($p =~ /[$valid]/) {

 	if ($p =~ /^[^$valid]*([$valid]+)/) {
 	    my $conf = "CONFIG_" . $1;

 	    $p =~ s/^[^$valid]*[$valid]+//;

 	    if (!defined($configs{$conf})) {
 		# We must make sure that this config has its
 		# dependencies met.
 		$repeat = 1; # do again
 		$configs{$conf} = 1;
 	    }
 	} else {
 	    die "this should never happen";
 	}
     }
 }

 while ($repeat) {
     $repeat = 0;

     foreach my $config (keys %configs) {
 	$config =~ s/^CONFIG_//;

 	if (defined($depends{$config})) {
 	    # This config has dependencies. Make sure they are also included
 	    parse_config_dep_select $depends{$config};
 	}

 	if (defined($prompts{$config}) || !defined($selects{$config})) {
 	    next;
 	}

 	# config has no prompt and must be selected.
 	parse_config_dep_select $selects{$config};
     }
 }

 my %setconfigs;

 # Finally, read the .config file and turn off any module enabled that
 # we could not find a reason to keep enabled.
 while(<CIN>) {

     if (/CONFIG_IKCONFIG/) {
 	if (/# CONFIG_IKCONFIG is not set/) {
 	    # enable IKCONFIG at least as a module
 	    print "CONFIG_IKCONFIG=m\n";
 	    # don't ask about PROC
 	    print "# CONFIG_IKCONFIG_PROC is not set\n";
 	} else {
 	    print;
 	}
 	next;
     }

     if (/^(CONFIG.*)=(m|y)/) {
 	if (defined($configs{$1})) {
 	    if ($localyesconfig) {
 	        $setconfigs{$1} = 'y';
 	    } else {
 	        $setconfigs{$1} = $2;
 	    }
 	} elsif ($2 eq "m") {
 	    print "# $1 is not set\n";
 	    next;
 	}
     }
     print;
 }
 close(CIN);

 # Integrity check, make sure all modules that we want enabled do
 # indeed have their configs set.
 loop:
 foreach my $module (keys(%modules)) {
     if (defined($objects{$module})) {
 	my @arr = @{$objects{$module}};
 	foreach my $conf (@arr) {
 	    if (defined($setconfigs{$conf})) {
 		next loop;
 	    }
 	}
 	print STDERR "module $module did not have configs";
 	foreach my $conf (@arr) {
 	    print STDERR " " , $conf;
 	}
 	print STDERR "\n";
     }
 }
	#!/usr/bin/perl -w
	#
	# Copyright 2005-2009 - Steven Rostedt
	# Licensed under the terms of the GNU GPL License version 2
	#
	# It's simple enough to figure out how this works.
	# If not, then you can ask me at stripconfig@goodmis.org
	#
	# What it does?
	#
	# If you have installed a Linux kernel from a distribution
	# that turns on way too many modules than you need, and
	# you only want the modules you use, then this program
	# is perfect for you.
	#
	# It gives you the ability to turn off all the modules that are
	# not loaded on your system.
	#
	# Howto:
	#
	# 1. Boot up the kernel that you want to stream line the config on.
	# 2. Change directory to the directory holding the source of the
	# kernel that you just booted.
	# 3. Copy the configuraton file to this directory as .config
	# 4. Have all your devices that you need modules for connected and
	# operational (make sure that their corresponding modules are loaded)
	# 5. Run this script redirecting the output to some other file
	# like config_strip.
	# 6. Back up your old config (if you want too).
	# 7. copy the config_strip file to .config
	# 8. Run "make oldconfig"
	#
	# Now your kernel is ready to be built with only the modules that
	# are loaded.
	#
	# Here's what I did with my Debian distribution.
	#
	# cd /usr/src/linux-2.6.10
	# cp /boot/config-2.6.10-1-686-smp .config
	# ~/bin/streamline_config > config_strip
	# mv .config config_sav
	# mv config_strip .config
	# make oldconfig
	#
	use strict;
	use Getopt::Long;

	my $config = ".config";

	my $uname = `uname -r`;
	chomp $uname;

	my @searchconfigs = (
	{
	"file" => ".config",
	"exec" => "cat",
	},
	{
	"file" => "/proc/config.gz",
	"exec" => "zcat",
	},
	{
	"file" => "/boot/config-$uname",
	"exec" => "cat",
	},
	{
	"file" => "/boot/vmlinuz-$uname",
	"exec" => "scripts/extract-ikconfig",
	"test" => "scripts/extract-ikconfig",
	},
	{
	"file" => "vmlinux",
	"exec" => "scripts/extract-ikconfig",
	"test" => "scripts/extract-ikconfig",
	},
	{
	"file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
	"exec" => "scripts/extract-ikconfig",
	"test" => "scripts/extract-ikconfig",
	},
	{
	"file" => "kernel/configs.ko",
	"exec" => "scripts/extract-ikconfig",
	"test" => "scripts/extract-ikconfig",
	},
	{
	"file" => "kernel/configs.o",
	"exec" => "scripts/extract-ikconfig",
	"test" => "scripts/extract-ikconfig",
	},
	);

	sub find_config {
	foreach my $conf (@searchconfigs) {
	my $file = $conf->{"file"};

	next if ( ! -f "$file");

	if (defined($conf->{"test"})) {
	`$conf->{"test"} $conf->{"file"} 2>/dev/null`;
	next if ($?);
	}

	my $exec = $conf->{"exec"};

	print STDERR "using config: '$file'\n";

	open(CIN, "$exec $file \|") \|\| die "Failed to run $exec $file";
	return;
	}
	die "No config file found";
	}

	find_config;

	# Parse options
	my $localmodconfig = 0;
	my $localyesconfig = 0;

	GetOptions("localmodconfig" => \$localmodconfig,
	"localyesconfig" => \$localyesconfig);

	# Get the build source and top level Kconfig file (passed in)
	my $ksource = $ARGV[0];
	my $kconfig = $ARGV[1];
	my $lsmod_file = $ENV{'LSMOD'};

	my @makefiles = `find $ksource -name Makefile 2>/dev/null`;
	chomp @makefiles;

	my %depends;
	my %selects;
	my %prompts;
	my %objects;
	my $var;
	my $iflevel = 0;
	my @ifdeps;

	# prevent recursion
	my %read_kconfigs;

	sub read_kconfig {
	my ($kconfig) = @_;

	my $state = "NONE";
	my $config;
	my @kconfigs;

	my $cont = 0;
	my $line;

	my $source = "$ksource/$kconfig";
	my $last_source = "";

	# Check for any environment variables used
	while ($source =~ /\$(\w+)/ && $last_source ne $source) {
	my $env = $1;
	$last_source = $source;
	$source =~ s/\$$env/$ENV{$env}/;
	}

	open(KIN, "$source") \|\| die "Can't open $kconfig";
	while (<KIN>) {
	chomp;

	# Make sure that lines ending with \ continue
	if ($cont) {
	$_ = $line . " " . $_;
	}

	if (s/\\$//) {
	$cont = 1;
	$line = $_;
	next;
	}

	$cont = 0;

	# collect any Kconfig sources
	if (/^source\s"(.)"/) {
	$kconfigs[$#kconfigs+1] = $1;
	}

	# configs found
	if (/^\s(menu)?config\s+(\S+)\s$/) {
	$state = "NEW";
	$config = $2;

	for (my $i = 0; $i < $iflevel; $i++) {
	if ($i) {
	$depends{$config} .= " " . $ifdeps[$i];
	} else {
	$depends{$config} = $ifdeps[$i];
	}
	$state = "DEP";
	}

	# collect the depends for the config
	} elsif ($state eq "NEW" && /^\sdepends\s+on\s+(.)$/) {
	$state = "DEP";
	$depends{$config} = $1;
	} elsif ($state eq "DEP" && /^\sdepends\s+on\s+(.)$/) {
	$depends{$config} .= " " . $1;

	# Get the configs that select this config
	} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
	if (defined($selects{$1})) {
	$selects{$1} .= " " . $config;
	} else {
	$selects{$1} = $config;
	}

	# configs without prompts must be selected
	} elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
	# note if the config has a prompt
	$prompts{$config} = 1;

	# Check for if statements
	} elsif (/^if\s+(.\S)\s$/) {
	my $deps = $1;
	# remove beginning and ending non text
	$deps =~ s/^[^a-zA-Z0-9_]*//;
	$deps =~ s/[^a-zA-Z0-9_]*$//;

	my @deps = split /[^a-zA-Z0-9_]+/, $deps;

	$ifdeps[$iflevel++] = join ':', @deps;

	} elsif (/^endif/) {

	$iflevel-- if ($iflevel);

	# stop on "help"
	} elsif (/^\shelp\s$/) {
	$state = "NONE";
	}
	}
	close(KIN);

	# read in any configs that were found.
	foreach $kconfig (@kconfigs) {
	if (!defined($read_kconfigs{$kconfig})) {
	$read_kconfigs{$kconfig} = 1;
	read_kconfig($kconfig);
	}
	}
	}

	if ($kconfig) {
	read_kconfig($kconfig);
	}

	sub convert_vars {
	my ($line, %vars) = @_;

	my $process = "";

	while ($line =~ s/^(.?)(\$\((.?)\))//) {
	my $start = $1;
	my $variable = $2;
	my $var = $3;

	if (defined($vars{$var})) {
	$process .= $start . $vars{$var};
	} else {
	$process .= $start . $variable;
	}
	}

	$process .= $line;

	return $process;
	}

	# Read all Makefiles to map the configs to the objects
	foreach my $makefile (@makefiles) {

	my $line = "";
	my %make_vars;

	open(MIN,$makefile) \|\| die "Can't open $makefile";
	while (<MIN>) {
	# if this line ends with a backslash, continue
	chomp;
	if (/^(.*)\\$/) {
	$line .= $1;
	next;
	}

	$line .= $_;
	$_ = $line;
	$line = "";

	my $objs;

	$_ = convert_vars($_, %make_vars);

	# collect objects after obj-$(CONFIG_FOO_BAR)
	if (/obj-\$\((CONFIG_[^\)])\)\s[+:]?=\s(.)/) {
	$var = $1;
	$objs = $2;

	# check if variables are set
	} elsif (/^\s(\S+)\s[:]?=\s(.\S)/) {
	$make_vars{$1} = $2;
	}
	if (defined($objs)) {
	foreach my $obj (split /\s+/,$objs) {
	$obj =~ s/-/_/g;
	if ($obj =~ /(.*)\.o$/) {
	# Objects may be enabled by more than one config.
	# Store configs in an array.
	my @arr;

	if (defined($objects{$1})) {
	@arr = @{$objects{$1}};
	}

	$arr[$#arr+1] = $var;

	# The objects have a hash mapping to a reference
	# of an array of configs.
	$objects{$1} = \@arr;
	}
	}
	}
	}
	close(MIN);
	}

	my %modules;

	if (defined($lsmod_file)) {
	if ( ! -f $lsmod_file) {
	if ( -f $ENV{'objtree'}."/".$lsmod_file) {
	$lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
	} else {
	die "$lsmod_file not found";
	}
	}
	if ( -x $lsmod_file) {
	# the file is executable, run it
	open(LIN, "$lsmod_file\|");
	} else {
	# Just read the contents
	open(LIN, "$lsmod_file");
	}
	} else {

	# see what modules are loaded on this system
	my $lsmod;

	foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
	if ( -x "$dir/lsmod" ) {
	$lsmod = "$dir/lsmod";
	last;
	}
	}
	if (!defined($lsmod)) {
	# try just the path
	$lsmod = "lsmod";
	}

	open(LIN,"$lsmod\|") \|\| die "Can not call lsmod with $lsmod";
	}

	while (<LIN>) {
	next if (/^Module/); # Skip the first line.
	if (/^(\S+)/) {
	$modules{$1} = 1;
	}
	}
	close (LIN);

	# add to the configs hash all configs that are needed to enable
	# a loaded module.
	my %configs;
	foreach my $module (keys(%modules)) {
	if (defined($objects{$module})) {
	my @arr = @{$objects{$module}};
	foreach my $conf (@arr) {
	$configs{$conf} = $module;
	}
	} else {
	# Most likely, someone has a custom (binary?) module loaded.
	print STDERR "$module config not found!!\n";
	}
	}

	my $valid = "A-Za-z_0-9";
	my $repeat = 1;

	#
	# Note, we do not care about operands (like: &&, \|\|, !) we want to add any
	# config that is in the depend list of another config. This script does
	# not enable configs that are not already enabled. If we come across a
	# config A that depends on !B, we can still add B to the list of depends
	# to keep on. If A was on in the original config, B would not have been
	# and B would not be turned on by this script.
	#
	sub parse_config_dep_select
	{
	my ($p) = @_;

	while ($p =~ /[$valid]/) {

	if ($p =~ /^[^$valid]*([$valid]+)/) {
	my $conf = "CONFIG_" . $1;

	$p =~ s/^[^$valid]*[$valid]+//;

	if (!defined($configs{$conf})) {
	# We must make sure that this config has its
	# dependencies met.
	$repeat = 1; # do again
	$configs{$conf} = 1;
	}
	} else {
	die "this should never happen";
	}
	}
	}

	while ($repeat) {
	$repeat = 0;

	foreach my $config (keys %configs) {
	$config =~ s/^CONFIG_//;

	if (defined($depends{$config})) {
	# This config has dependencies. Make sure they are also included
	parse_config_dep_select $depends{$config};
	}

	if (defined($prompts{$config}) \|\| !defined($selects{$config})) {
	next;
	}

	# config has no prompt and must be selected.
	parse_config_dep_select $selects{$config};
	}
	}

	my %setconfigs;

	# Finally, read the .config file and turn off any module enabled that
	# we could not find a reason to keep enabled.
	while(<CIN>) {

	if (/CONFIG_IKCONFIG/) {
	if (/# CONFIG_IKCONFIG is not set/) {
	# enable IKCONFIG at least as a module
	print "CONFIG_IKCONFIG=m\n";
	# don't ask about PROC
	print "# CONFIG_IKCONFIG_PROC is not set\n";
	} else {
	print;
	}
	next;
	}

	if (/^(CONFIG.*)=(m\|y)/) {
	if (defined($configs{$1})) {
	if ($localyesconfig) {
	$setconfigs{$1} = 'y';
	} else {
	$setconfigs{$1} = $2;
	}
	} elsif ($2 eq "m") {
	print "# $1 is not set\n";
	next;
	}
	}
	print;
	}
	close(CIN);

	# Integrity check, make sure all modules that we want enabled do
	# indeed have their configs set.
	loop:
	foreach my $module (keys(%modules)) {
	if (defined($objects{$module})) {
	my @arr = @{$objects{$module}};
	foreach my $conf (@arr) {
	if (defined($setconfigs{$conf})) {
	next loop;
	}
	}
	print STDERR "module $module did not have configs";
	foreach my $conf (@arr) {
	print STDERR " " , $conf;
	}
	print STDERR "\n";
	}
	}