#!/usr/bin/perl -w # SPDX-License-Identifier: GPL-2.0-only # # Copyright 2015 - Steven Rostedt, Red Hat Inc. # Copyright 2017 - Steven Rostedt, VMware, Inc. #
# Compares a good config to a bad config, then takes half of the diffs # and produces a config that is somewhere between the good config and # the bad config. That is, the resulting config will start with the # good config and will try to make half of the differences of between # the good and bad configs match the bad config. It tries because of # dependencies between the two configs it may not be able to change # exactly half of the configs that are different between the two config # files.
# Here's a normal way to use it: # # $ cd /path/to/linux/kernel # $ config-bisect.pl /path/to/good/config /path/to/bad/config
# This will now pull in good config (blowing away .config in that directory # so do not make that be one of the good or bad configs), and then # build the config with "make oldconfig" to make sure it matches the # current kernel. It will then store the configs in that result for # the good config. It does the same for the bad config as well. # The algorithm will run, merging half of the differences between # the two configs and building them with "make oldconfig" to make sure # the result changes (dependencies may reset changes the tool had made). # It then copies the result of its good config to /path/to/good/config.tmp # and the bad config to /path/to/bad/config.tmp (just appends ".tmp" to the # files passed in). And the ".config" that you should test will be in # directory
# After the first run, determine if the result is good or bad then # run the same command appending the result
# For good results: # $ config-bisect.pl /path/to/good/config /path/to/bad/config good
# For bad results: # $ config-bisect.pl /path/to/good/config /path/to/bad/config bad
# Do not change the good-config or bad-config, config-bisect.pl will # copy the good-config to a temp file with the same name as good-config # but with a ".tmp" after it. It will do the same with the bad-config.
# If "good" or "bad" is not stated at the end, it will copy the good and # bad configs to the .tmp versions. If a .tmp version already exists, it will # warn before writing over them (-r will not warn, and just write over them). # If the last config is labeled "good", then it will copy it to the good .tmp # version. If the last config is labeled "bad", it will copy it to the bad # .tmp version. It will continue this until it can not merge the two any more # without the result being equal to either the good or bad .tmp configs.
my $start = 0;
my $val = "";
my $pwd = `pwd`;
chomp $pwd;
my $tree = $pwd;
my $build;
my $output_config;
my $reset_bisect;
sub usage {
print << "EOF"
usage: config-bisect.pl [-l linux-tree][-b build-dir] good-config bad-config [good|bad]
-l [optional] define location of linux-tree (default is current directory)
-b [optional] define location to build (O=build-dir) (default is linux-tree)
good-config the config that is considered good
bad-config the config that does not work "good" add this if the last run produced a good config "bad" add this if the last run produced a bad config If"good" or "bad" is not specified, then it is the start of a new bisect
Note, each run will create copy of good and bad configs with ".tmp" appended.
EOF
;
exit(-1);
}
sub doprint {
print @_;
}
sub dodie {
doprint "CRITICAL FAILURE... ", @_, "\n";
# config_ignore holds the configs that were set (or unset) for # a good config and we will ignore these configs for the rest # of a config bisect. These configs stay as they were.
my %config_ignore;
# config_set holds what all configs were set as.
my %config_set;
# config_off holds the set of configs that the bad config had disabled. # We need to record them and set them in the .config when running # olddefconfig, because olddefconfig keeps the defaults.
my %config_off;
# config_off_tmp holds a set of configs to turn off for now
my @config_off_tmp;
# config_list is the set of configs that are being tested
my %config_list;
my %null_config;
my %dependency;
my $make;
sub make_oldconfig {
if (!run_command "$make olddefconfig") { # Perhaps olddefconfig doesn't exist in this version of the kernel # try oldnoconfig
doprint "olddefconfig failed, trying make oldnoconfig\n"; if (!run_command "$make oldnoconfig") {
doprint "oldnoconfig failed, trying yes '' | make oldconfig\n"; # try a yes '' | oldconfig
run_command "yes '' | $make oldconfig" or
dodie "failed make config oldconfig";
}
}
}
sub assign_configs {
my ($hash, $config) = @_;
doprint "Reading configs from $config\n";
open (IN, $config)
or dodie "Failed to read $config";
while (<IN>) {
chomp; if (/^((CONFIG\S*)=.*)/) {
${$hash}{$2} = $1;
} elsif (/^(# (CONFIG\S*) is not set)/) {
${$hash}{$2} = $1;
}
}
close(IN);
}
sub process_config_ignore {
my ($config) = @_;
assign_configs \%config_ignore, $config;
}
sub get_dependencies {
my ($config) = @_;
my $arr = $dependency{$config}; if (!defined($arr)) {
return ();
}
my @deps = @{$arr};
foreach my $dep (@{$arr}) {
print "ADD DEP $dep\n";
@deps = (@deps, get_dependencies $dep);
}
return @deps;
}
sub save_config {
my ($pc, $file) = @_;
my %configs = %{$pc};
doprint "Saving configs into $file\n";
open(OUT, ">$file") or dodie "Can not write to $file";
foreach my $config (keys %configs) {
print OUT "$configs{$config}\n";
}
close(OUT);
}
sub create_config {
my ($name, $pc) = @_;
doprint "Creating old config from $name configs\n";
save_config $pc, $output_config;
make_oldconfig;
}
# compare two config hashes, and return configs with different vals. # It returns B's config values, but you can use A to see what A was.
sub diff_config_vals {
my ($pa, $pb) = @_;
# crappy Perl way to pass in hashes.
my %a = %{$pa};
my %b = %{$pb};
my %ret;
foreach my $item (keys %a) { if (defined($b{$item}) && $b{$item} ne $a{$item}) {
$ret{$item} = $b{$item};
}
}
return %ret;
}
# compare two config hashes and return the configs in B but not A
sub diff_configs {
my ($pa, $pb) = @_;
my %ret;
# crappy Perl way to pass in hashes.
my %a = %{$pa};
my %b = %{$pb};
foreach my $item (keys %b) { if (!defined($a{$item})) {
$ret{$item} = $b{$item};
}
}
return %ret;
}
# return if two configs are equal or not # 0 is equal +1 b has something a does not # +1 if a and b have a different item. # -1 if a has something b does not
sub compare_configs {
my ($pa, $pb) = @_;
my %ret;
# crappy Perl way to pass in hashes.
my %a = %{$pa};
my %b = %{$pb};
foreach my $item (keys %b) { if (!defined($a{$item})) {
return 1;
} if ($a{$item} ne $b{$item}) {
return 1;
}
}
foreach my $item (keys %a) { if (!defined($b{$item})) {
return -1;
}
}
return 0;
}
sub process_failed {
my ($config) = @_;
doprint "\n\n***************************************\n";
doprint "Found bad config: $config\n";
doprint "***************************************\n\n";
}
sub process_new_config {
my ($tc, $nc, $gc, $bc) = @_;
my %tmp_config = %{$tc};
my %good_configs = %{$gc};
my %bad_configs = %{$bc};
$ret = compare_configs \%new_configs, \%bad_configs; if (!$ret) {
doprint "New config equals bad config, try next test\n";
$runtest = 0;
}
if ($runtest) {
$ret = compare_configs \%new_configs, \%good_configs; if (!$ret) {
doprint "New config equals good config, try next test\n";
$runtest = 0;
}
}
%{$nc} = %new_configs;
return $runtest;
}
sub convert_config {
my ($config) = @_;
if ($config =~ /^# (.*) is not set/) {
$config = "$1=n";
}
my $good_value = $good_config;
my $bad_value = $bad_config;
$good_value =~ s/(.*)=//;
my $config = $1;
$bad_value =~ s/.*=//;
doprint " $config $good_value -> $bad_value\n";
}
# Pass in: # $phalf: half of the configs names you want to add # $oconfigs: The orginial configs to start with # $sconfigs: The source to update $oconfigs with (from $phalf) # $which: The name of which half that is updating (top / bottom) # $type: The name of the source type (good / bad)
sub make_half {
my ($phalf, $oconfigs, $sconfigs, $which, $type) = @_;
my @half = @{$phalf};
my %orig_configs = %{$oconfigs};
my %source_configs = %{$sconfigs};
my %tmp_config = %orig_configs;
doprint "Settings bisect with $which half of $type configs:\n"; foreach my $item (@half) {
doprint "Updating $item to $source_configs{$item}\n";
$tmp_config{$item} = $source_configs{$item};
}
return %tmp_config;
}
sub run_config_bisect {
my ($pgood, $pbad) = @_;
my %good_configs = %{$pgood};
my %bad_configs = %{$pbad};
my %diff_configs = diff_config_vals \%good_configs, \%bad_configs;
my %b_configs = diff_configs \%good_configs, \%bad_configs;
my %g_configs = diff_configs \%bad_configs, \%good_configs;
# diff_arr is what is in both good and bad but are different (y->n)
my @diff_arr = keys %diff_configs;
my $len_diff = $#diff_arr + 1;
# b_arr is what is in bad but not in good (has depends)
my @b_arr = keys %b_configs;
my $len_b = $#b_arr + 1;
# g_arr is what is in good but not in bad
my @g_arr = keys %g_configs;
my $len_g = $#g_arr + 1;
my $runtest = 0;
my %new_configs;
my $ret;
# Look at the configs that are different between good and bad. # This does not include those that depend on other configs # (configs depending on other configs that are not set would # not show up even as a "# CONFIG_FOO is not set"
doprint "# of configs to check: $len_diff\n";
doprint "# of configs showing only in good: $len_g\n";
doprint "# of configs showing only in bad: $len_b\n";
if ($len_diff > 0) { # Now test for different values
doprint "Configs left to check:\n";
doprint " Good Config\t\t\tBad Config\n";
doprint " -----------\t\t\t----------\n"; foreach my $item (@diff_arr) {
doprint " $good_configs{$item}\t$bad_configs{$item}\n";
}
my $half = int($#diff_arr / 2);
my @tophalf = @diff_arr[0 .. $half];
doprint "Set tmp config to be good config with some bad config values\n";
my %tmp_config = make_half \@tophalf, \%good_configs,
\%bad_configs, "top", "bad";
if ($runtest) {
make_oldconfig;
doprint "READY TO TEST .config IN $build\n";
return 0;
}
doprint "\n%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
doprint "Hmm, can't make any more changes without making good == bad?\n";
doprint "Difference between good (+) and bad (-)\n";
foreach my $item (keys %bad_configs) { if (!defined($good_configs{$item})) {
print_config "-", $bad_configs{$item};
}
}
foreach my $item (keys %good_configs) {
next if (!defined($bad_configs{$item})); if ($good_configs{$item} ne $bad_configs{$item}) {
print_config_compare $good_configs{$item}, $bad_configs{$item};
}
}
foreach my $item (keys %good_configs) { if (!defined($bad_configs{$item})) {
print_config "+", $good_configs{$item};
}
}
return -1;
}
sub config_bisect {
my ($good_config, $bad_config) = @_;
my $ret;
my %good_configs;
my %bad_configs;
my %tmp_configs;
doprint "Run good configs through make oldconfig\n";
assign_configs \%tmp_configs, $good_config;
create_config "$good_config", \%tmp_configs;
assign_configs \%good_configs, $output_config;
doprint "Run bad configs through make oldconfig\n";
assign_configs \%tmp_configs, $bad_config;
create_config "$bad_config", \%tmp_configs;
assign_configs \%bad_configs, $output_config;
if ( ! -d $tree ) {
die "$tree not a directory\n";
}
if ( ! -d $build ) {
die "$build not a directory\n";
}
usage if $#ARGV < 1;
if ($#ARGV == 1) {
$start = 1;
} elsif ($#ARGV == 2) {
$val = $ARGV[2]; if ($val ne "good" && $val ne "bad") {
die "Unknown command '$val', bust be either \"good\" or \"bad\"\n";
}
} else {
usage;
}
my $good_start = expand_path $ARGV[0];
my $bad_start = expand_path $ARGV[1];
my $good = "$good_start.tmp";
my $bad = "$bad_start.tmp";
$make = "make";
if ($build ne $tree) {
$make = "make O=$build"
}
$output_config = "$build/.config";
if ($start) { if ( ! -f $good_start ) {
die "$good_start not found\n";
} if ( ! -f $bad_start ) {
die "$bad_start not found\n";
} if ( -f $good || -f $bad ) {
my $p = "";
if ( -f $good ) {
$p = "$good exists\n";
}
if ( -f $bad ) {
$p = "$p$bad exists\n";
}
if (!defined($reset_bisect)) { if (!read_yn "${p}Overwrite and start new bisect anyway?") {
exit (-1);
}
}
}
run_command "cp $good_start $good" or die "failed to copy to $good\n";
run_command "cp $bad_start $bad" or die "failed to copy to $bad\n";
} else { if ( ! -f $good ) {
die "Can not find file $good\n";
} if ( ! -f $bad ) {
die "Can not find file $bad\n";
} if ($val eq "good") {
run_command "cp $output_config $good" or die "failed to copy $config to $good\n";
} elsif ($val eq "bad") {
run_command "cp $output_config $bad" or die "failed to copy $config to $bad\n";
}
}
chdir $tree || die "can't change directory to $tree";
my $ret = config_bisect $good, $bad;
if (!$ret) {
exit(0);
}
if ($ret > 0) {
doprint "Cleaning temp files\n";
run_command "rm $good";
run_command "rm $bad";
exit(1);
} else {
doprint "See good and bad configs for details:\n";
doprint "good: $good\n";
doprint "bad: $bad\n";
doprint "%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
}
exit(2);
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