mirror of https://gitee.com/openkylin/linux.git
Improve localmodconfig to remove even more unused module configs.
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJQFuLTAAoJEIy3vGnGbaoA+uoP/jBR7LDOMC85i3YIK8pgPoRU qQlTj2AoY9s1ZwZHoRoxAbiDoqYc/zQlI+60N7tKrbk0cGwo8vWVInOShRDPsVKv B8AQMGh1laje6C2lLzW43ZG00ZpG5AxxhXae9/mn+koLqHSj5qzy6UCpyieSWTt+ HAnow+mlmyHyHRpdRv6/RCcO4gpag82V8fBmmBMeJv0GfSvDvHYRhFWYqwI7T0QC PMVBM59WhKUoFDG2RLOdgRP9lxBfGqPaH7yEpVJFYBDErA/AD5+RyLO7zqKWcwJw JJL/dj7bNB7S0AqELGJbKTXJL+Ir0YXfW+N9xzDcCOlScf54ZUwZmN+mligLC9on 10tKRpZyzSxYa+3xsu2OzMuSEf0Px5uQOd5SeEcCLPwE2TQ5PMvSG4I9ACgXvfNq 5i1NPe8K9W7rOjTe1Sb7s0uI+Sm8chYcMHtJPtlL4yQDWq1eeHJ0vi3snZhbfmLx VxogmmFpJzAx78d2KntaPOTBoA11pk3AmbTuBFLPfh4sSh8Xe80LZ9/AtFN6Eq4M B/9si3afTP62CCdqVYPaiUO/zPykCsz4NvgdAPhT0ESCdIDpr4SeC4iWaXj+teL3 oifB0+qkOe8tJ4k2esMpfFU/igFWORNXvNjFwLeUw/4BT5WMVdnoSk1YatmakuIB bEYO5TGM4xZ5FBnSD37R =pYw7 -----END PGP SIGNATURE----- Merge tag 'localmodconfig-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-kconfig Pull localmodconfig updates from Steven Rostedt: "Improve localmodconfig to remove even more unused module configs. These changes drastically improve the amount of module configs removed from a config file. It also adds some debug that I can have users easily enable if things do not work for them." * tag 'localmodconfig-v3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-kconfig: localmodconfig: Add debug environment variable LOCALMODCONFIG_DEBUG localmodconfig: Check if configs are already set for selects localmodconfig: Read in orig config file to avoid extra processing localmodconfig: Comments and cleanup for streamline_config.pl
This commit is contained in:
Linus Torvalds
commit
f6bcfc9dd4
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@ -45,6 +45,16 @@
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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 $config = ".config";
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my $uname = `uname -r`;
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@ -113,6 +123,10 @@ sub find_config {
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find_config;
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# Read in the entire config file into config_file
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my @config_file = <CIN>;
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close CIN;
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# Parse options
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my $localmodconfig = 0;
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my $localyesconfig = 0;
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@ -186,6 +200,7 @@ sub read_kconfig {
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$state = "NEW";
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$config = $2;
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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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@ -204,10 +219,11 @@ sub read_kconfig {
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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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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{$1} = $config;
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$selects{$conf} = $config;
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}
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# configs without prompts must be selected
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@ -250,6 +266,7 @@ if ($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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@ -293,6 +310,7 @@ foreach my $makefile (@makefiles) {
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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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@ -373,13 +391,15 @@ while (<LIN>) {
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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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# 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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}
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} else {
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# Most likely, someone has a custom (binary?) module loaded.
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@ -387,9 +407,24 @@ foreach my $module (keys(%modules)) {
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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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@ -398,7 +433,7 @@ my $repeat = 1;
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# to keep on. If A was on in the original config, B would not have been
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# and B would not be turned on by this script.
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#
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sub parse_config_dep_select
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sub parse_config_depends
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{
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my ($p) = @_;
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@ -409,10 +444,16 @@ sub parse_config_dep_select
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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 "m") {
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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{$conf} = 1;
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}
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} else {
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@ -421,31 +462,132 @@ sub parse_config_dep_select
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}
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}
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while ($repeat) {
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$repeat = 0;
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# Select is treated a bit differently than depends. We call this
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# when a config has no prompt and requires another config to be
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# selected. We use to just select all configs that selected this
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# config, but found that that can balloon into enabling hundreds
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# of configs that we do not care about.
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#
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# The idea is we look at all the configs that select it. If one
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# is already in our list of configs to enable, then there's nothing
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# else to do. If there isn't, we pick the first config that was
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# enabled in the orignal config and use that.
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sub parse_config_selects
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{
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my ($config, $p) = @_;
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foreach my $config (keys %configs) {
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$config =~ s/^CONFIG_//;
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my $next_config;
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if (defined($depends{$config})) {
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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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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 = $conf;
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}
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} else {
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die "this should never happen";
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}
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}
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if (defined($prompts{$config}) || !defined($selects{$config})) {
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next;
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# If no possible config selected this, then something happened.
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if (!defined($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 $config\n";
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}
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my %process_selects;
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# loop through all configs, select their dependencies.
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sub loop_depend {
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$repeat = 1;
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while ($repeat) {
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$repeat = 0;
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forloop:
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foreach my $config (keys %configs) {
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# If this config is not a module, we do not need to process it
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if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
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next forloop;
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}
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$config =~ s/^CONFIG_//;
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$depconfig = $config;
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if (defined($depends{$config})) {
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# This config has dependencies. Make sure they are also included
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parse_config_depends $depends{$config};
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}
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# If the config has no prompt, then we need to check if a config
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# that is enabled selected it. Or if we need to enable one.
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if (!defined($prompts{$config}) && defined($selects{$config})) {
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$process_selects{$config} = 1;
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}
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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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sub loop_select {
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foreach my $config (keys %process_selects) {
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$config =~ s/^CONFIG_//;
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dprint "Process select $config\n";
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# config has no prompt and must be selected.
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parse_config_selects $config, $selects{$config};
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}
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}
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while ($repeat) {
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# Get the first set of configs and their dependencies.
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loop_depend;
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$repeat = 0;
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# Now we need to see if we have to check selects;
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loop_select;
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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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foreach my $line (@config_file) {
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$_ = $line;
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if (/CONFIG_IKCONFIG/) {
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if (/# CONFIG_IKCONFIG is not set/) {
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@ -473,7 +615,6 @@ while(<CIN>) {
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}
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print;
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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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