| #!/usr/bin/perl -w |
| # |
| # Copywrite 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; |
| |
| 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; |
| |
| # Get the build source and top level Kconfig file (passed in) |
| my $ksource = $ARGV[0]; |
| my $kconfig = $ARGV[1]; |
| my $lsmod_file = $ARGV[2]; |
| |
| my @makefiles = `find $ksource -name Makefile 2>/dev/null`; |
| chomp @makefiles; |
| |
| my %depends; |
| my %selects; |
| my %prompts; |
| my %objects; |
| my $var; |
| my $cont = 0; |
| my $iflevel = 0; |
| my @ifdeps; |
| |
| # prevent recursion |
| my %read_kconfigs; |
| |
| sub read_kconfig { |
| my ($kconfig) = @_; |
| |
| my $state = "NONE"; |
| my $config; |
| my @kconfigs; |
| |
| 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; |
| |
| # collect any Kconfig sources |
| if (/^source\s*"(.*)"/) { |
| $kconfigs[$#kconfigs+1] = $1; |
| } |
| |
| # configs found |
| if (/^\s*config\s+(\S+)\s*$/) { |
| $state = "NEW"; |
| $config = $1; |
| |
| 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); |
| } |
| |
| # Read all Makefiles to map the configs to the objects |
| foreach my $makefile (@makefiles) { |
| |
| open(MIN,$makefile) || die "Can't open $makefile"; |
| while (<MIN>) { |
| my $objs; |
| |
| # is this a line after a line with a backslash? |
| if ($cont && /(\S.*)$/) { |
| $objs = $1; |
| } |
| $cont = 0; |
| |
| # collect objects after obj-$(CONFIG_FOO_BAR) |
| if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) { |
| $var = $1; |
| $objs = $2; |
| } |
| if (defined($objs)) { |
| # test if the line ends with a backslash |
| if ($objs =~ m,(.*)\\$,) { |
| $objs = $1; |
| $cont = 1; |
| } |
| |
| 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 $lsmod_file) { |
| die "$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})) { |
| $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"; |
| } |
| } |