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author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2011-08-31 23:35:05 +0200 |
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committer | Peter Korsgaard <jacmet@sunsite.dk> | 2011-09-17 08:17:06 +0200 |
commit | 56da3859c770b83631ebae810dfb3024c1a9cbd2 (patch) | |
tree | 0f253485b64572a2ec87b6d91cd07f09d2fab652 /support/kconfig/streamline_config.pl | |
parent | 59a326b934737483531c49c99acda7874c72e335 (diff) | |
download | buildroot-novena-56da3859c770b83631ebae810dfb3024c1a9cbd2.tar.gz buildroot-novena-56da3859c770b83631ebae810dfb3024c1a9cbd2.zip |
support: move kconfig stuff from package/config to support/kconfig
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Diffstat (limited to 'support/kconfig/streamline_config.pl')
-rw-r--r-- | support/kconfig/streamline_config.pl | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/support/kconfig/streamline_config.pl b/support/kconfig/streamline_config.pl new file mode 100644 index 000000000..fd81fc33d --- /dev/null +++ b/support/kconfig/streamline_config.pl @@ -0,0 +1,451 @@ +#!/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 $iflevel = 0; +my @ifdeps; + +# prevent recursion +my %read_kconfigs; + +sub read_kconfig { + my ($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); +} + +# Read all Makefiles to map the configs to the objects +foreach my $makefile (@makefiles) { + + my $cont = 0; + + open(MIN,$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"; + } +} |