[deliverable/linux.git] / scripts / kconfig / streamline_config.pl

#!/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";
    }
}
Commit	Line	Data
dcc60243 SR	1	#!/usr/bin/perl -w
dcc60243 SR	2	#
cce1dac8	3	# Copyright 2005-2009 - Steven Rostedt
dcc60243 SR	4	# Licensed under the terms of the GNU GPL License version 2
	5	#
	6	# It's simple enough to figure out how this works.
	7	# If not, then you can ask me at stripconfig@goodmis.org
	8	#
	9	# What it does?
	10	#
	11	# If you have installed a Linux kernel from a distribution
	12	# that turns on way too many modules than you need, and
	13	# you only want the modules you use, then this program
	14	# is perfect for you.
	15	#
	16	# It gives you the ability to turn off all the modules that are
	17	# not loaded on your system.
	18	#
	19	# Howto:
	20	#
	21	# 1. Boot up the kernel that you want to stream line the config on.
	22	# 2. Change directory to the directory holding the source of the
	23	# kernel that you just booted.
	24	# 3. Copy the configuraton file to this directory as .config
	25	# 4. Have all your devices that you need modules for connected and
	26	# operational (make sure that their corresponding modules are loaded)
	27	# 5. Run this script redirecting the output to some other file
	28	# like config_strip.
	29	# 6. Back up your old config (if you want too).
	30	# 7. copy the config_strip file to .config
	31	# 8. Run "make oldconfig"
	32	#
	33	# Now your kernel is ready to be built with only the modules that
	34	# are loaded.
	35	#
	36	# Here's what I did with my Debian distribution.
	37	#
	38	# cd /usr/src/linux-2.6.10
	39	# cp /boot/config-2.6.10-1-686-smp .config
	40	# ~/bin/streamline_config > config_strip
	41	# mv .config config_sav
	42	# mv config_strip .config
	43	# make oldconfig
	44	#
cf5a189d	45	use strict;
22d550ae	46	use Getopt::Long;
cf5a189d	47
dcc60243	48	my $config = ".config";
dcc60243	49
cdfc4795 SR	50	my $uname = `uname -r`;
	51	chomp $uname;
	52
	53	my @searchconfigs = (
a9024838 SR	54	{
	55	"file" => ".config",
	56	"exec" => "cat",
	57	},
cdfc4795 SR	58	{
	59	"file" => "/proc/config.gz",
	60	"exec" => "zcat",
	61	},
810b2be6 SR	62	{
	63	"file" => "/boot/config-$uname",
	64	"exec" => "cat",
	65	},
cdfc4795 SR	66	{
	67	"file" => "/boot/vmlinuz-$uname",
	68	"exec" => "scripts/extract-ikconfig",
	69	"test" => "scripts/extract-ikconfig",
	70	},
	71	{
	72	"file" => "vmlinux",
	73	"exec" => "scripts/extract-ikconfig",
	74	"test" => "scripts/extract-ikconfig",
	75	},
	76	{
	77	"file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
	78	"exec" => "scripts/extract-ikconfig",
	79	"test" => "scripts/extract-ikconfig",
	80	},
	81	{
	82	"file" => "kernel/configs.ko",
	83	"exec" => "scripts/extract-ikconfig",
	84	"test" => "scripts/extract-ikconfig",
	85	},
	86	{
	87	"file" => "kernel/configs.o",
	88	"exec" => "scripts/extract-ikconfig",
	89	"test" => "scripts/extract-ikconfig",
	90	},
cdfc4795 SR	91	);
	92
	93	sub find_config {
	94	foreach my $conf (@searchconfigs) {
	95	my $file = $conf->{"file"};
	96
	97	next if ( ! -f "$file");
	98
	99	if (defined($conf->{"test"})) {
	100	`$conf->{"test"} $conf->{"file"} 2>/dev/null`;
	101	next if ($?);
	102	}
	103
	104	my $exec = $conf->{"exec"};
	105
	106	print STDERR "using config: '$file'\n";
	107
	108	open(CIN, "$exec $file \|") \|\| die "Failed to run $exec $file";
	109	return;
	110	}
	111	die "No config file found";
	112	}
	113
	114	find_config;
	115
22d550ae AL	116	# Parse options
	117	my $localmodconfig = 0;
	118	my $localyesconfig = 0;
	119
	120	GetOptions("localmodconfig" => \$localmodconfig,
	121	"localyesconfig" => \$localyesconfig);
	122
463bf900 SR	123	# Get the build source and top level Kconfig file (passed in)
	124	my $ksource = $ARGV[0];
	125	my $kconfig = $ARGV[1];
f597a718	126	my $lsmod_file = $ENV{'LSMOD'};
463bf900	127
17431928 TF	128	my @makefiles = `find $ksource -name Makefile 2>/dev/null`;
	129	chomp @makefiles;
	130
dcc60243 SR	131	my %depends;
	132	my %selects;
	133	my %prompts;
	134	my %objects;
	135	my $var;
13d7e938 SR	136	my $iflevel = 0;
13d7e938 SR	137	my @ifdeps;
dcc60243	138
dcc60243 SR	139	# prevent recursion
	140	my %read_kconfigs;
	141
	142	sub read_kconfig {
	143	my ($kconfig) = @_;
	144
	145	my $state = "NONE";
	146	my $config;
	147	my @kconfigs;
	148
20d19047 SR	149	my $cont = 0;
	150	my $line;
	151
4908980b SR	152	my $source = "$ksource/$kconfig";
	153	my $last_source = "";
	154
	155	# Check for any environment variables used
	156	while ($source =~ /\$(\w+)/ && $last_source ne $source) {
	157	my $env = $1;
	158	$last_source = $source;
	159	$source =~ s/\$$env/$ENV{$env}/;
	160	}
	161
	162	open(KIN, "$source") \|\| die "Can't open $kconfig";
dcc60243 SR	163	while (<KIN>) {
	164	chomp;
	165
20d19047 SR	166	# Make sure that lines ending with \ continue
	167	if ($cont) {
	168	$_ = $line . " " . $_;
	169	}
	170
	171	if (s/\\$//) {
	172	$cont = 1;
	173	$line = $_;
	174	next;
	175	}
	176
	177	$cont = 0;
	178
dcc60243 SR	179	# collect any Kconfig sources
	180	if (/^source\s"(.)"/) {
	181	$kconfigs[$#kconfigs+1] = $1;
	182	}
	183
	184	# configs found
8ef17fa2	185	if (/^\s(menu)?config\s+(\S+)\s$/) {
dcc60243	186	$state = "NEW";
8ef17fa2	187	$config = $2;
dcc60243	188
13d7e938 SR	189	for (my $i = 0; $i < $iflevel; $i++) {
	190	if ($i) {
	191	$depends{$config} .= " " . $ifdeps[$i];
	192	} else {
	193	$depends{$config} = $ifdeps[$i];
	194	}
	195	$state = "DEP";
	196	}
	197
dcc60243 SR	198	# collect the depends for the config
	199	} elsif ($state eq "NEW" && /^\sdepends\s+on\s+(.)$/) {
	200	$state = "DEP";
	201	$depends{$config} = $1;
	202	} elsif ($state eq "DEP" && /^\sdepends\s+on\s+(.)$/) {
	203	$depends{$config} .= " " . $1;
	204
	205	# Get the configs that select this config
	206	} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
	207	if (defined($selects{$1})) {
	208	$selects{$1} .= " " . $config;
	209	} else {
	210	$selects{$1} = $config;
	211	}
	212
	213	# configs without prompts must be selected
	214	} elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
	215	# note if the config has a prompt
ccece60a	216	$prompts{$config} = 1;
dcc60243	217
13d7e938 SR	218	# Check for if statements
	219	} elsif (/^if\s+(.\S)\s$/) {
	220	my $deps = $1;
	221	# remove beginning and ending non text
	222	$deps =~ s/^[^a-zA-Z0-9_]*//;
	223	$deps =~ s/[^a-zA-Z0-9_]*$//;
	224
	225	my @deps = split /[^a-zA-Z0-9_]+/, $deps;
	226
	227	$ifdeps[$iflevel++] = join ':', @deps;
	228
	229	} elsif (/^endif/) {
	230
	231	$iflevel-- if ($iflevel);
	232
dcc60243 SR	233	# stop on "help"
	234	} elsif (/^\shelp\s$/) {
	235	$state = "NONE";
	236	}
	237	}
	238	close(KIN);
	239
	240	# read in any configs that were found.
	241	foreach $kconfig (@kconfigs) {
	242	if (!defined($read_kconfigs{$kconfig})) {
	243	$read_kconfigs{$kconfig} = 1;
	244	read_kconfig($kconfig);
	245	}
	246	}
	247	}
	248
	249	if ($kconfig) {
	250	read_kconfig($kconfig);
	251	}
	252
364212fd SR	253	sub convert_vars {
	254	my ($line, %vars) = @_;
	255
	256	my $process = "";
	257
	258	while ($line =~ s/^(.?)(\$\((.?)\))//) {
	259	my $start = $1;
	260	my $variable = $2;
	261	my $var = $3;
	262
	263	if (defined($vars{$var})) {
	264	$process .= $start . $vars{$var};
	265	} else {
	266	$process .= $start . $variable;
	267	}
	268	}
	269
	270	$process .= $line;
	271
	272	return $process;
	273	}
	274
dcc60243 SR	275	# Read all Makefiles to map the configs to the objects
dcc60243 SR	276	foreach my $makefile (@makefiles) {
dcc60243	277
d060d963	278	my $line = "";
364212fd	279	my %make_vars;
20d19047	280
dcc60243 SR	281	open(MIN,$makefile) \|\| die "Can't open $makefile";
dcc60243 SR	282	while (<MIN>) {
d060d963 SR	283	# if this line ends with a backslash, continue
	284	chomp;
	285	if (/^(.*)\\$/) {
	286	$line .= $1;
	287	next;
dcc60243	288	}
d060d963 SR	289
	290	$line .= $_;
	291	$_ = $line;
	292	$line = "";
	293
	294	my $objs;
dcc60243	295
364212fd SR	296	$_ = convert_vars($_, %make_vars);
364212fd SR	297
dcc60243 SR	298	# collect objects after obj-$(CONFIG_FOO_BAR)
	299	if (/obj-\$\((CONFIG_[^\)])\)\s[+:]?=\s(.)/) {
	300	$var = $1;
	301	$objs = $2;
364212fd SR	302
	303	# check if variables are set
	304	} elsif (/^\s(\S+)\s[:]?=\s(.\S)/) {
	305	$make_vars{$1} = $2;
dcc60243 SR	306	}
dcc60243 SR	307	if (defined($objs)) {
dcc60243 SR	308	foreach my $obj (split /\s+/,$objs) {
	309	$obj =~ s/-/_/g;
	310	if ($obj =~ /(.*)\.o$/) {
1d1d1fea	311	# Objects may be enabled by more than one config.
dcc60243 SR	312	# Store configs in an array.
	313	my @arr;
	314
	315	if (defined($objects{$1})) {
	316	@arr = @{$objects{$1}};
	317	}
	318
	319	$arr[$#arr+1] = $var;
	320
	321	# The objects have a hash mapping to a reference
	322	# of an array of configs.
	323	$objects{$1} = \@arr;
	324	}
	325	}
	326	}
	327	}
	328	close(MIN);
	329	}
	330
	331	my %modules;
	332
615f0833 SR	333	if (defined($lsmod_file)) {
615f0833 SR	334	if ( ! -f $lsmod_file) {
f597a718 AL	335	if ( -f $ENV{'objtree'}."/".$lsmod_file) {
	336	$lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
	337	} else {
	338	die "$lsmod_file not found";
	339	}
615f0833 SR	340	}
	341	if ( -x $lsmod_file) {
	342	# the file is executable, run it
	343	open(LIN, "$lsmod_file\|");
	344	} else {
	345	# Just read the contents
	346	open(LIN, "$lsmod_file");
88f66ea9	347	}
615f0833 SR	348	} else {
	349
	350	# see what modules are loaded on this system
	351	my $lsmod;
	352
cf5a189d	353	foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
615f0833 SR	354	if ( -x "$dir/lsmod" ) {
	355	$lsmod = "$dir/lsmod";
	356	last;
	357	}
88f66ea9	358	}
615f0833 SR	359	if (!defined($lsmod)) {
	360	# try just the path
	361	$lsmod = "lsmod";
	362	}
	363
	364	open(LIN,"$lsmod\|") \|\| die "Can not call lsmod with $lsmod";
88f66ea9 SR	365	}
88f66ea9 SR	366
dcc60243 SR	367	while (<LIN>) {
	368	next if (/^Module/); # Skip the first line.
	369	if (/^(\S+)/) {
	370	$modules{$1} = 1;
	371	}
	372	}
	373	close (LIN);
	374
	375	# add to the configs hash all configs that are needed to enable
	376	# a loaded module.
	377	my %configs;
	378	foreach my $module (keys(%modules)) {
	379	if (defined($objects{$module})) {
e5199edb	380	my @arr = @{$objects{$module}};
dcc60243 SR	381	foreach my $conf (@arr) {
	382	$configs{$conf} = $module;
	383	}
	384	} else {
	385	# Most likely, someone has a custom (binary?) module loaded.
	386	print STDERR "$module config not found!!\n";
	387	}
	388	}
	389
	390	my $valid = "A-Za-z_0-9";
	391	my $repeat = 1;
	392
	393	#
	394	# Note, we do not care about operands (like: &&, \|\|, !) we want to add any
	395	# config that is in the depend list of another config. This script does
	396	# not enable configs that are not already enabled. If we come across a
	397	# config A that depends on !B, we can still add B to the list of depends
	398	# to keep on. If A was on in the original config, B would not have been
	399	# and B would not be turned on by this script.
	400	#
	401	sub parse_config_dep_select
	402	{
	403	my ($p) = @_;
	404
	405	while ($p =~ /[$valid]/) {
	406
	407	if ($p =~ /^[^$valid]*([$valid]+)/) {
	408	my $conf = "CONFIG_" . $1;
	409
	410	$p =~ s/^[^$valid]*[$valid]+//;
	411
	412	if (!defined($configs{$conf})) {
	413	# We must make sure that this config has its
	414	# dependencies met.
	415	$repeat = 1; # do again
	416	$configs{$conf} = 1;
	417	}
	418	} else {
	419	die "this should never happen";
	420	}
	421	}
	422	}
	423
	424	while ($repeat) {
	425	$repeat = 0;
	426
	427	foreach my $config (keys %configs) {
	428	$config =~ s/^CONFIG_//;
	429
74398d32 SR	430	if (defined($depends{$config})) {
	431	# This config has dependencies. Make sure they are also included
	432	parse_config_dep_select $depends{$config};
dcc60243 SR	433	}
dcc60243 SR	434
ccece60a	435	if (defined($prompts{$config}) \|\| !defined($selects{$config})) {
dcc60243 SR	436	next;
	437	}
	438
	439	# config has no prompt and must be selected.
	440	parse_config_dep_select $selects{$config};
	441	}
	442	}
	443
	444	my %setconfigs;
	445
	446	# Finally, read the .config file and turn off any module enabled that
	447	# we could not find a reason to keep enabled.
	448	while(<CIN>) {
744ffcbe SR	449
	450	if (/CONFIG_IKCONFIG/) {
	451	if (/# CONFIG_IKCONFIG is not set/) {
	452	# enable IKCONFIG at least as a module
	453	print "CONFIG_IKCONFIG=m\n";
	454	# don't ask about PROC
d08ca277	455	print "# CONFIG_IKCONFIG_PROC is not set\n";
744ffcbe SR	456	} else {
	457	print;
	458	}
	459	next;
	460	}
	461
	462	if (/^(CONFIG.*)=(m\|y)/) {
	463	if (defined($configs{$1})) {
22d550ae AL	464	if ($localyesconfig) {
	465	$setconfigs{$1} = 'y';
	466	} else {
	467	$setconfigs{$1} = $2;
	468	}
744ffcbe SR	469	} elsif ($2 eq "m") {
744ffcbe SR	470	print "# $1 is not set\n";
d08ca277	471	next;
dcc60243	472	}
744ffcbe	473	}
d08ca277	474	print;
dcc60243 SR	475	}
	476	close(CIN);
	477
	478	# Integrity check, make sure all modules that we want enabled do
	479	# indeed have their configs set.
	480	loop:
	481	foreach my $module (keys(%modules)) {
	482	if (defined($objects{$module})) {
	483	my @arr = @{$objects{$module}};
	484	foreach my $conf (@arr) {
	485	if (defined($setconfigs{$conf})) {
	486	next loop;
	487	}
	488	}
	489	print STDERR "module $module did not have configs";
	490	foreach my $conf (@arr) {
	491	print STDERR " " , $conf;
	492	}
	493	print STDERR "\n";
	494	}
	495	}