kconfig: add streamline_config.pl to scripts
streamline_config.pl is a very powerful tool. For those that install a kernel to a new box using the config file from the distribution know that it can take forever to compile the kernel. Making a custom config file that will still boot your box, but bring down the compile time of the kernel can be quit painful, and to ask someone that reported a bug to do this can be a large burdon since that person may not even know how to build a kernel. This script will perform "lsmod" to find all the modules loaded on the current running system. It will read all the Makefiles to map which CONFIG enables a module. It will read the Kconfig files to find the dependencies and selects that may be needed to support a CONFIG. Finally, it reads the .config file and removes any module "=m" that is not needed to enable the currently loaded modules. The output goes to standard out. Here's a way to run the script. From the Linux directory that holds a distribution .config. $ scripts/kconfig/streamline_config.pl arch/x86/Kconfig > config-sl $ mv .config config-save $ mv config-sl .config $ make oldconfig Now you have a .config that will still build all your modules, but also take much less time to build the kernel. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Steven Rostedt
Steven Rostedt
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291
scripts/kconfig/streamline_config.pl
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291
scripts/kconfig/streamline_config.pl
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#!/usr/bin/perl -w
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#
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# Copywrite 2005-2009 - Steven Rostedt
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# Licensed under the terms of the GNU GPL License version 2
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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 configuraton 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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my $config = ".config";
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my $linuxpath = ".";
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open(CIN,$config) || die "Can't open current config file: $config";
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my @makefiles = `find $linuxpath -name Makefile`;
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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 $var;
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my $cont = 0;
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# Get the top level Kconfig file (passed in)
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my $kconfig = $ARGV[0];
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# prevent recursion
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my %read_kconfigs;
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sub read_kconfig {
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my ($kconfig) = @_;
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my $state = "NONE";
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my $config;
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my @kconfigs;
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open(KIN, $kconfig) || die "Can't open $kconfig";
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while (<KIN>) {
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chomp;
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# collect any Kconfig sources
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if (/^source\s*"(.*)"/) {
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$kconfigs[$#kconfigs+1] = $1;
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}
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# configs found
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if (/^\s*config\s+(\S+)\s*$/) {
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$state = "NEW";
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$config = $1;
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# collect the depends for the config
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} elsif ($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} .= " " . $1;
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# Get the configs that select this config
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} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
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if (defined($selects{$1})) {
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$selects{$1} .= " " . $config;
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} else {
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$selects{$1} = $config;
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}
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# configs without prompts must be selected
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} elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
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# note if the config has a prompt
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$prompt{$config} = 1;
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# stop on "help"
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} elsif (/^\s*help\s*$/) {
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$state = "NONE";
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}
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}
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close(KIN);
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# read in any configs that were found.
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foreach $kconfig (@kconfigs) {
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if (!defined($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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}
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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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# Read all Makefiles to map the configs to the objects
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foreach my $makefile (@makefiles) {
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chomp $makefile;
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open(MIN,$makefile) || die "Can't open $makefile";
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while (<MIN>) {
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my $objs;
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# is this a line after a line with a backslash?
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if ($cont && /(\S.*)$/) {
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$objs = $1;
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}
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$cont = 0;
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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 = $2;
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}
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if (defined($objs)) {
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# test if the line ends with a backslash
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if ($objs =~ m,(.*)\\$,) {
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$objs = $1;
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$cont = 1;
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}
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foreach my $obj (split /\s+/,$objs) {
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$obj =~ s/-/_/g;
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if ($obj =~ /(.*)\.o$/) {
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# Objects may bes enabled by more than one config.
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# Store configs in an array.
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my @arr;
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if (defined($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{$1} = \@arr;
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}
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}
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}
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}
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close(MIN);
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}
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my %modules;
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# see what modules are loaded on this system
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open(LIN,"/sbin/lsmod|") || die "Cant lsmod";
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while (<LIN>) {
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next if (/^Module/); # Skip the first line.
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if (/^(\S+)/) {
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$modules{$1} = 1;
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}
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}
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close (LIN);
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# add to the configs hash all configs that are needed to enable
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# a loaded module.
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my %configs;
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foreach my $module (keys(%modules)) {
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if (defined($objects{$module})) {
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@arr = @{$objects{$module}};
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foreach my $conf (@arr) {
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$configs{$conf} = $module;
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}
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} else {
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# Most likely, someone has a custom (binary?) module loaded.
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print STDERR "$module config not found!!\n";
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}
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}
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my $valid = "A-Za-z_0-9";
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my $repeat = 1;
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#
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# Note, we do not care about operands (like: &&, ||, !) we want to add any
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# config that is in the depend list of another config. This script does
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# not enable configs that are not already enabled. If we come across a
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# config A that depends on !B, we can still add B to the list of depends
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# to keep on. If A was on in the original config, B would not have been
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# and B would not be turned on by this script.
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#
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sub parse_config_dep_select
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{
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my ($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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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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$repeat = 1; # do again
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$configs{$conf} = 1;
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}
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} else {
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die "this should never happen";
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}
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}
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}
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while ($repeat) {
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$repeat = 0;
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foreach my $config (keys %configs) {
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$config =~ s/^CONFIG_//;
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if (!defined($depends{$config})) {
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next;
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}
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# This config has dependencies. Make sure they are also included
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parse_config_dep_select $depends{$config};
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if (defined($prompt{$config}) || !defined($selects{$config})) {
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next;
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}
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# config has no prompt and must be selected.
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parse_config_dep_select $selects{$config};
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}
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}
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my %setconfigs;
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# Finally, read the .config file and turn off any module enabled that
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# we could not find a reason to keep enabled.
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while(<CIN>) {
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if (/^(CONFIG.*)=m/) {
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if (defined($configs{$1})) {
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$setconfigs{$1} = 1;
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print;
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} else {
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print "# $1 is not set\n";
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}
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} else {
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print;
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}
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}
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close(CIN);
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# Integrity check, make sure all modules that we want enabled do
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# indeed have their configs set.
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loop:
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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 $conf (@arr) {
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if (defined($setconfigs{$conf})) {
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next loop;
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}
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}
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print STDERR "module $module did not have configs";
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foreach my $conf (@arr) {
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print STDERR " " , $conf;
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}
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print STDERR "\n";
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}
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}
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