FM / kconfig

/usr/src/linux-headers-5.15.0-190-generic/scripts/kconfig/

/usr/src/linux-headers-5.15.0-190-generic/scripts/kconfig

Name	Size	Mode	Actions
lxdialog/	-	0755	rm
tests/	-	0755	rm
.conf.cmd	291	0644	edit dl rm
.conf.o.cmd	761	0644	edit dl rm
.confdata.o.cmd	838	0644	edit dl rm
.expr.o.cmd	761	0644	edit dl rm
.lexer.lex.c.cmd	130	0644	edit dl rm
.lexer.lex.o.cmd	829	0644	edit dl rm
.menu.o.cmd	825	0644	edit dl rm
.parser.tab.h.cmd	177	0644	edit dl rm
.parser.tab.o.cmd	903	0644	edit dl rm
.preprocess.o.cmd	821	0644	edit dl rm
.symbol.o.cmd	781	0644	edit dl rm
.util.o.cmd	761	0644	edit dl rm
conf	145520	0755	edit dl rm
conf.c	20558	0644	edit dl rm
conf.o	27848	0644	edit dl rm
confdata.c	23334	0644	edit dl rm
confdata.o	25736	0644	edit dl rm
expr.c	30249	0644	edit dl rm
expr.h	9653	0644	edit dl rm
expr.o	24856	0644	edit dl rm
gconf-cfg.sh	775	0755	edit dl rm
gconf.c	38975	0644	edit dl rm
gconf.glade	25642	0644	edit dl rm
images.c	6573	0644	edit dl rm
images.h	857	0644	edit dl rm
internal.h	172	0644	edit dl rm
lexer.l	9259	0644	edit dl rm
lexer.lex.c	115380	0644	edit dl rm
lexer.lex.o	49544	0644	edit dl rm
list.h	3749	0644	edit dl rm
lkc.h	4044	0644	edit dl rm
lkc_proto.h	2013	0644	edit dl rm
Makefile	7788	0644	edit dl rm
mconf-cfg.sh	1502	0755	edit dl rm
mconf.c	27888	0644	edit dl rm
menu.c	22090	0644	edit dl rm
menu.o	21144	0644	edit dl rm
merge_config.sh	5181	0755	edit dl rm
nconf-cfg.sh	1404	0755	edit dl rm
nconf.c	38875	0644	edit dl rm
nconf.gui.c	14911	0644	edit dl rm
nconf.h	2050	0644	edit dl rm
parser.tab.c	73309	0644	edit dl rm
parser.tab.h	5118	0644	edit dl rm
parser.tab.o	42960	0644	edit dl rm
parser.y	15608	0644	edit dl rm
preprocess.c	11334	0644	edit dl rm
preprocess.o	12088	0644	edit dl rm
qconf-cfg.sh	643	0755	edit dl rm
qconf.cc	44467	0644	edit dl rm
qconf.h	6552	0644	edit dl rm
streamline_config.pl	16821	0755	edit dl rm
symbol.c	29410	0644	edit dl rm
symbol.o	26552	0644	edit dl rm
util.c	2210	0644	edit dl rm
util.o	5104	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/scripts/kconfig/streamline_config.pl (16821B)

#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0
#
# Copyright 2005-2009 - Steven Rostedt
#
#  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 configuration 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 warnings;
use strict;
use Getopt::Long;

# set the environment variable LOCALMODCONFIG_DEBUG to get
# debug output.
my $debugprint = 0;
$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));

sub dprint {
    return if (!$debugprint);
    print STDERR @_;
}

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 read_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(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file";
	my @x = <$infile>;
	close $infile;
	return @x;
    }
    die "No config file found";
}

my @config_file = read_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] ? $ARGV[0] : '.');
my $kconfig = $ARGV[1];
my $lsmod_file = $ENV{'LSMOD'};

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

my %depends;
my %selects;
my %prompts;
my %objects;
my %config2kfile;
my $var;
my $iflevel = 0;
my @ifdeps;

# prevent recursion
my %read_kconfigs;

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

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

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(my $kinfile, '<', $source) || die "Can't open $kconfig";
    while (<$kinfile>) {
	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+"?([^"]+)/) {
	    my $kconfig = $1;
	    # prevent reading twice.
	    if (!defined($read_kconfigs{$kconfig})) {
		$read_kconfigs{$kconfig} = 1;
		read_kconfig($kconfig);
	    }
	    next;
	}

# configs found
	if (/^\s*(menu)?config\s+(\S+)\s*$/) {
	    $state = "NEW";
	    $config = $2;
	    $config2kfile{"CONFIG_$config"} = $kconfig;

# Add depends for 'if' nesting
	    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} .= " " . $1;
	} elsif ($state eq "DEP" && /^\s*def(_(bool|tristate)|ault)\s+(\S.*)$/) {
	    my $dep = $3;
	    if ($dep !~ /^\s*(y|m|n)\s*$/) {
		$dep =~ s/.*\sif\s+//;
		$depends{$config} .= " " . $dep;
		dprint "Added default depends $dep to $config\n";
	    }

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

# configs without prompts must be selected
	} elsif ($state ne "NONE" && /^\s*(tristate\s+\S|prompt\b)/) {
	    # 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" and keywords that end a menu entry
	} elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) {
	    $state = "NONE";
	}
    }
    close($kinfile);
}

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

# Makefiles can use variables to define their dependencies
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(my $infile, '<', $makefile) || die "Can't open $makefile";
    while (<$infile>) {
	# if this line ends with a backslash, continue
	chomp;
	if (/^(.*)\\$/) {
	    $line .= $1;
	    next;
	}

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

my $objs;

# Convert variables in a line (could define configs)
	$_ = convert_vars($_, %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{$1} = \@arr;
		}
	    }
	}
    }
    close($infile);
}

my %modules;
my $linfile;

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";
	}
    }

my $otype = ( -x $lsmod_file) ? '-|' : '<';
    open($linfile, $otype, $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($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
}

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

# add to the configs hash all configs that are needed to enable
# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
# where we know we need bar.o so we add FOO to the list.
my %configs;
foreach my $module (keys(%modules)) {
    if (defined($objects{$module})) {
	my @arr = @{$objects{$module}};
	foreach my $conf (@arr) {
	    $configs{$conf} = $module;
	    dprint "$conf added by direct ($module)\n";
	    if ($debugprint) {
		my $c=$conf;
		$c =~ s/^CONFIG_//;
		if (defined($depends{$c})) {
		    dprint " deps = $depends{$c}\n";
		} else {
		    dprint " no deps\n";
		}
	    }
	}
    } else {
	# Most likely, someone has a custom (binary?) module loaded.
	print STDERR "$module config not found!!\n";
    }
}

# Read the current config, and see what is enabled. We want to
# ignore configs that we would not enable anyway.

my %orig_configs;
my $valid = "A-Za-z_0-9";

foreach my $line (@config_file) {
    $_ = $line;

if (/(CONFIG_[$valid]*)=(m|y)/) {
	$orig_configs{$1} = $2;
    }
}

my $repeat = 1;

my $depconfig;

#
# 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_depends
{
    my ($p) = @_;

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

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

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

# We only need to process if the depend config is a module
	    if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") {
		next;
	    }

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

# Select is treated a bit differently than depends. We call this
# when a config has no prompt and requires another config to be
# selected. We use to just select all configs that selected this
# config, but found that that can balloon into enabling hundreds
# of configs that we do not care about.
#
# The idea is we look at all the configs that select it. If one
# is already in our list of configs to enable, then there's nothing
# else to do. If there isn't, we pick the first config that was
# enabled in the original config and use that.
sub parse_config_selects
{
    my ($config, $p) = @_;

my $next_config;

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

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

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

# Make sure that this config exists in the current .config file
	    if (!defined($orig_configs{$conf})) {
		dprint "$conf not set for $config select\n";
		next;
	    }

# Check if something other than a module selects this config
	    if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
		dprint "$conf (non module) selects config, we are good\n";
		# we are good with this
		return;
	    }
	    if (defined($configs{$conf})) {
		dprint "$conf selects $config so we are good\n";
		# A set config selects this config, we are good
		return;
	    }
	    # Set this config to be selected
	    if (!defined($next_config)) {
		$next_config = $conf;
	    }
	} else {
	    die "this should never happen";
	}
    }

# If no possible config selected this, then something happened.
    if (!defined($next_config)) {
	print STDERR "WARNING: $config is required, but nothing in the\n";
	print STDERR "  current config selects it.\n";
	return;
    }

# If we are here, then we found no config that is set and
    # selects this config. Repeat.
    $repeat = 1;
    # Make this config need to be selected
    $configs{$next_config} = 1;
    dprint "$next_config selected by select $config\n";
}

my %process_selects;

# loop through all configs, select their dependencies.
sub loop_depend {
    $repeat = 1;

while ($repeat) {
	$repeat = 0;

forloop:
	foreach my $config (keys %configs) {

# If this config is not a module, we do not need to process it
	    if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
		next forloop;
	    }

$config =~ s/^CONFIG_//;
	    $depconfig = $config;

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

# If the config has no prompt, then we need to check if a config
	    # that is enabled selected it. Or if we need to enable one.
	    if (!defined($prompts{$config}) && defined($selects{$config})) {
		$process_selects{$config} = 1;
	    }
	}
    }
}

sub loop_select {

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

dprint "Process select $config\n";

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

while ($repeat) {
    # Get the first set of configs and their dependencies.
    loop_depend;

$repeat = 0;

# Now we need to see if we have to check selects;
    loop_select;
}

my %setconfigs;
my @preserved_kconfigs;
if (defined($ENV{'LMC_KEEP'})) {
	@preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
}

sub in_preserved_kconfigs {
    my $kconfig = $config2kfile{$_[0]};
    if (!defined($kconfig)) {
	return 0;
    }
    foreach my $excl (@preserved_kconfigs) {
	if($kconfig =~ /^$excl/) {
	    return 1;
	}
    }
    return 0;
}

# Finally, read the .config file and turn off any module enabled that
# we could not find a reason to keep enabled.
foreach my $line (@config_file) {
    $_ = $line;

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_MODULE_SIG_KEY="(.+)"/) {
	my $orig_cert = $1;
	my $default_cert = "certs/signing_key.pem";

# Check that the logic in this script still matches the one in Kconfig
	if (!defined($depends{"MODULE_SIG_KEY"}) ||
	    $depends{"MODULE_SIG_KEY"} !~ /"\Q$default_cert\E"/) {
	    print STDERR "WARNING: MODULE_SIG_KEY assertion failure, ",
		"update needed to ", __FILE__, " line ", __LINE__, "\n";
	    print;
	} elsif ($orig_cert ne $default_cert && ! -f $orig_cert) {
	    print STDERR "Module signature verification enabled but ",
		"module signing key \"$orig_cert\" not found. Resetting ",
		"signing key to default value.\n";
	    print "CONFIG_MODULE_SIG_KEY=\"$default_cert\"\n";
	} else {
	    print;
	}
	next;
    }

if (/CONFIG_SYSTEM_TRUSTED_KEYS="(.+)"/) {
	my $orig_keys = $1;

if (! -f $orig_keys) {
	    print STDERR "System keyring enabled but keys \"$orig_keys\" ",
		"not found. Resetting keys to default value.\n";
	    print "CONFIG_SYSTEM_TRUSTED_KEYS=\"\"\n";
	} else {
	    print;
	}
	next;
    }

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

# 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";
    }
}

# vim: softtabstop=4

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