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21f8b32fbd
s/configuraton/configuration/ s/orignal/original/ Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
704 lines
17 KiB
Perl
Executable file
704 lines
17 KiB
Perl
Executable file
#!/usr/bin/env perl
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright 2005-2009 - Steven Rostedt
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#
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# It's simple enough to figure out how this works.
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# If not, then you can ask me at stripconfig@goodmis.org
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#
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# What it does?
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#
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# If you have installed a Linux kernel from a distribution
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# that turns on way too many modules than you need, and
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# you only want the modules you use, then this program
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# is perfect for you.
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#
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# It gives you the ability to turn off all the modules that are
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# not loaded on your system.
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#
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# Howto:
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#
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# 1. Boot up the kernel that you want to stream line the config on.
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# 2. Change directory to the directory holding the source of the
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# kernel that you just booted.
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# 3. Copy the configuration file to this directory as .config
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# 4. Have all your devices that you need modules for connected and
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# operational (make sure that their corresponding modules are loaded)
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# 5. Run this script redirecting the output to some other file
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# like config_strip.
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# 6. Back up your old config (if you want too).
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# 7. copy the config_strip file to .config
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# 8. Run "make oldconfig"
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#
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# Now your kernel is ready to be built with only the modules that
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# are loaded.
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#
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# Here's what I did with my Debian distribution.
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#
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# cd /usr/src/linux-2.6.10
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# cp /boot/config-2.6.10-1-686-smp .config
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# ~/bin/streamline_config > config_strip
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# mv .config config_sav
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# mv config_strip .config
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# make oldconfig
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#
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use warnings;
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use strict;
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use Getopt::Long;
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# set the environment variable LOCALMODCONFIG_DEBUG to get
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# debug output.
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my $debugprint = 0;
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$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
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sub dprint {
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return if (!$debugprint);
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print STDERR @_;
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}
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my $uname = `uname -r`;
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chomp $uname;
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my @searchconfigs = (
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{
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"file" => ".config",
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"exec" => "cat",
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},
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{
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"file" => "/proc/config.gz",
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"exec" => "zcat",
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},
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{
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"file" => "/boot/config-$uname",
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"exec" => "cat",
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},
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{
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"file" => "/boot/vmlinuz-$uname",
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"exec" => "scripts/extract-ikconfig",
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"test" => "scripts/extract-ikconfig",
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},
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{
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"file" => "vmlinux",
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"exec" => "scripts/extract-ikconfig",
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"test" => "scripts/extract-ikconfig",
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},
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{
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"file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
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"exec" => "scripts/extract-ikconfig",
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"test" => "scripts/extract-ikconfig",
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},
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{
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"file" => "kernel/configs.ko",
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"exec" => "scripts/extract-ikconfig",
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"test" => "scripts/extract-ikconfig",
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},
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{
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"file" => "kernel/configs.o",
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"exec" => "scripts/extract-ikconfig",
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"test" => "scripts/extract-ikconfig",
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},
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);
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sub read_config {
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foreach my $conf (@searchconfigs) {
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my $file = $conf->{"file"};
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next if ( ! -f "$file");
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if (defined($conf->{"test"})) {
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`$conf->{"test"} $conf->{"file"} 2>/dev/null`;
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next if ($?);
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}
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my $exec = $conf->{"exec"};
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print STDERR "using config: '$file'\n";
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open(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file";
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my @x = <$infile>;
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close $infile;
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return @x;
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}
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die "No config file found";
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}
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my @config_file = read_config;
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# Parse options
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my $localmodconfig = 0;
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my $localyesconfig = 0;
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GetOptions("localmodconfig" => \$localmodconfig,
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"localyesconfig" => \$localyesconfig);
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# Get the build source and top level Kconfig file (passed in)
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my $ksource = ($ARGV[0] ? $ARGV[0] : '.');
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my $kconfig = $ARGV[1];
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my $lsmod_file = $ENV{'LSMOD'};
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my @makefiles = `find $ksource -name Makefile -or -name Kbuild 2>/dev/null`;
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chomp @makefiles;
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my %depends;
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my %selects;
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my %prompts;
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my %objects;
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my %config2kfile;
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my $var;
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my $iflevel = 0;
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my @ifdeps;
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# prevent recursion
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my %read_kconfigs;
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sub read_kconfig {
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my ($kconfig) = @_;
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my $state = "NONE";
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my $config;
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my $cont = 0;
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my $line;
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my $source = "$ksource/$kconfig";
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my $last_source = "";
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# Check for any environment variables used
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while ($source =~ /\$\((\w+)\)/ && $last_source ne $source) {
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my $env = $1;
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$last_source = $source;
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$source =~ s/\$\($env\)/$ENV{$env}/;
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}
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open(my $kinfile, '<', $source) || die "Can't open $kconfig";
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while (<$kinfile>) {
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chomp;
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# Make sure that lines ending with \ continue
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if ($cont) {
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$_ = $line . " " . $_;
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}
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if (s/\\$//) {
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$cont = 1;
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$line = $_;
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next;
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}
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$cont = 0;
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# collect any Kconfig sources
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if (/^source\s+"?([^"]+)/) {
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my $kconfig = $1;
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# prevent reading twice.
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if (!defined($read_kconfigs{$kconfig})) {
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$read_kconfigs{$kconfig} = 1;
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read_kconfig($kconfig);
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}
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next;
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}
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# configs found
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if (/^\s*(menu)?config\s+(\S+)\s*$/) {
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$state = "NEW";
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$config = $2;
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$config2kfile{"CONFIG_$config"} = $kconfig;
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# Add depends for 'if' nesting
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for (my $i = 0; $i < $iflevel; $i++) {
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if ($i) {
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$depends{$config} .= " " . $ifdeps[$i];
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} else {
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$depends{$config} = $ifdeps[$i];
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}
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$state = "DEP";
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}
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# collect the depends for the config
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} elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
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$state = "DEP";
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$depends{$config} = $1;
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} elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
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$depends{$config} .= " " . $1;
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} elsif ($state eq "DEP" && /^\s*def(_(bool|tristate)|ault)\s+(\S.*)$/) {
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my $dep = $3;
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if ($dep !~ /^\s*(y|m|n)\s*$/) {
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$dep =~ s/.*\sif\s+//;
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$depends{$config} .= " " . $dep;
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dprint "Added default depends $dep to $config\n";
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}
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# Get the configs that select this config
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} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
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my $conf = $1;
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if (defined($selects{$conf})) {
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$selects{$conf} .= " " . $config;
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} else {
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$selects{$conf} = $config;
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}
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# configs without prompts must be selected
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} elsif ($state ne "NONE" && /^\s*(tristate\s+\S|prompt\b)/) {
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# note if the config has a prompt
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$prompts{$config} = 1;
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# Check for if statements
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} elsif (/^if\s+(.*\S)\s*$/) {
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my $deps = $1;
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# remove beginning and ending non text
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$deps =~ s/^[^a-zA-Z0-9_]*//;
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$deps =~ s/[^a-zA-Z0-9_]*$//;
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my @deps = split /[^a-zA-Z0-9_]+/, $deps;
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$ifdeps[$iflevel++] = join ':', @deps;
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} elsif (/^endif/) {
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$iflevel-- if ($iflevel);
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# stop on "help" and keywords that end a menu entry
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} elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) {
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$state = "NONE";
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}
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}
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close($kinfile);
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}
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if ($kconfig) {
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read_kconfig($kconfig);
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}
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# Makefiles can use variables to define their dependencies
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sub convert_vars {
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my ($line, %vars) = @_;
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my $process = "";
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while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
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my $start = $1;
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my $variable = $2;
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my $var = $3;
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if (defined($vars{$var})) {
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$process .= $start . $vars{$var};
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} else {
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$process .= $start . $variable;
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}
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}
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$process .= $line;
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return $process;
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}
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# Read all Makefiles to map the configs to the objects
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foreach my $makefile (@makefiles) {
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my $line = "";
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my %make_vars;
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open(my $infile, '<', $makefile) || die "Can't open $makefile";
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while (<$infile>) {
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# if this line ends with a backslash, continue
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chomp;
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if (/^(.*)\\$/) {
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$line .= $1;
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next;
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}
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$line .= $_;
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$_ = $line;
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$line = "";
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my $objs;
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# Convert variables in a line (could define configs)
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$_ = convert_vars($_, %make_vars);
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# collect objects after obj-$(CONFIG_FOO_BAR)
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if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
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$var = $1;
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$objs = $2;
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# check if variables are set
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} elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
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$make_vars{$1} = $2;
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}
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if (defined($objs)) {
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foreach my $obj (split /\s+/,$objs) {
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$obj =~ s/-/_/g;
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if ($obj =~ /(.*)\.o$/) {
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# Objects may be enabled by more than one config.
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# Store configs in an array.
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my @arr;
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if (defined($objects{$1})) {
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@arr = @{$objects{$1}};
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}
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$arr[$#arr+1] = $var;
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# The objects have a hash mapping to a reference
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# of an array of configs.
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$objects{$1} = \@arr;
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}
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}
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}
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}
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close($infile);
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}
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my %modules;
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my $linfile;
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if (defined($lsmod_file)) {
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if ( ! -f $lsmod_file) {
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if ( -f $ENV{'objtree'}."/".$lsmod_file) {
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$lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
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} else {
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die "$lsmod_file not found";
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}
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}
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my $otype = ( -x $lsmod_file) ? '-|' : '<';
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open($linfile, $otype, $lsmod_file);
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} else {
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# see what modules are loaded on this system
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my $lsmod;
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foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
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if ( -x "$dir/lsmod" ) {
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$lsmod = "$dir/lsmod";
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last;
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}
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}
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if (!defined($lsmod)) {
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# try just the path
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$lsmod = "lsmod";
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}
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open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
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}
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while (<$linfile>) {
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next if (/^Module/); # Skip the first line.
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if (/^(\S+)/) {
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$modules{$1} = 1;
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}
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}
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close ($linfile);
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# add to the configs hash all configs that are needed to enable
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# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
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# where we know we need bar.o so we add FOO to the list.
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my %configs;
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foreach my $module (keys(%modules)) {
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if (defined($objects{$module})) {
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my @arr = @{$objects{$module}};
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foreach my $conf (@arr) {
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$configs{$conf} = $module;
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dprint "$conf added by direct ($module)\n";
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if ($debugprint) {
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my $c=$conf;
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$c =~ s/^CONFIG_//;
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if (defined($depends{$c})) {
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dprint " deps = $depends{$c}\n";
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} else {
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dprint " no deps\n";
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}
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}
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}
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} else {
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# Most likely, someone has a custom (binary?) module loaded.
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print STDERR "$module config not found!!\n";
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}
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}
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# Read the current config, and see what is enabled. We want to
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# ignore configs that we would not enable anyway.
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my %orig_configs;
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my $valid = "A-Za-z_0-9";
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foreach my $line (@config_file) {
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$_ = $line;
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if (/(CONFIG_[$valid]*)=(m|y)/) {
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$orig_configs{$1} = $2;
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}
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}
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my $repeat = 1;
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my $depconfig;
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#
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# Note, we do not care about operands (like: &&, ||, !) we want to add any
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# config that is in the depend list of another config. This script does
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# not enable configs that are not already enabled. If we come across a
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# config A that depends on !B, we can still add B to the list of depends
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# to keep on. If A was on in the original config, B would not have been
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# and B would not be turned on by this script.
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#
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sub parse_config_depends
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{
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my ($p) = @_;
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while ($p =~ /[$valid]/) {
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if ($p =~ /^[^$valid]*([$valid]+)/) {
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my $conf = "CONFIG_" . $1;
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$p =~ s/^[^$valid]*[$valid]+//;
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# We only need to process if the depend config is a module
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if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") {
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next;
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}
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if (!defined($configs{$conf})) {
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# We must make sure that this config has its
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# dependencies met.
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$repeat = 1; # do again
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dprint "$conf selected by depend $depconfig\n";
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$configs{$conf} = 1;
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}
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} else {
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die "this should never happen";
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}
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}
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}
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# Select is treated a bit differently than depends. We call this
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# when a config has no prompt and requires another config to be
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# selected. We use to just select all configs that selected this
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# config, but found that that can balloon into enabling hundreds
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# of configs that we do not care about.
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#
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# The idea is we look at all the configs that select it. If one
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# is already in our list of configs to enable, then there's nothing
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# else to do. If there isn't, we pick the first config that was
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# enabled in the original config and use that.
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sub parse_config_selects
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{
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my ($config, $p) = @_;
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my $next_config;
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while ($p =~ /[$valid]/) {
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if ($p =~ /^[^$valid]*([$valid]+)/) {
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my $conf = "CONFIG_" . $1;
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$p =~ s/^[^$valid]*[$valid]+//;
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# Make sure that this config exists in the current .config file
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if (!defined($orig_configs{$conf})) {
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dprint "$conf not set for $config select\n";
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next;
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}
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# Check if something other than a module selects this config
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if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
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dprint "$conf (non module) selects config, we are good\n";
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# we are good with this
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return;
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}
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if (defined($configs{$conf})) {
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dprint "$conf selects $config so we are good\n";
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# A set config selects this config, we are good
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return;
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}
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# Set this config to be selected
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if (!defined($next_config)) {
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$next_config = $conf;
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}
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} else {
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die "this should never happen";
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}
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}
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# If no possible config selected this, then something happened.
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if (!defined($next_config)) {
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print STDERR "WARNING: $config is required, but nothing in the\n";
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print STDERR " current config selects it.\n";
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return;
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}
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# If we are here, then we found no config that is set and
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# selects this config. Repeat.
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$repeat = 1;
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# Make this config need to be selected
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$configs{$next_config} = 1;
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dprint "$next_config selected by select $config\n";
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}
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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";
|
|
}
|
|
}
|