return 1;
}
+my %depends;
+my $iflevel = 0;
+my @ifdeps;
+
+# prevent recursion
+my %read_kconfigs;
+
+# taken from streamline_config.pl
+sub read_kconfig {
+ my ($kconfig) = @_;
+
+ my $state = "NONE";
+ my $config;
+ my @kconfigs;
+
+ my $cont = 0;
+ my $line;
+
+
+ if (! -f $kconfig) {
+ doprint "file $kconfig does not exist, skipping\n";
+ return;
+ }
+
+ open(KIN, "$kconfig")
+ or 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+(.*)$/) {
+
+ if (defined($depends{$1})) {
+ $depends{$config} .= " " . $1;
+ } else {
+ $depends{$config} = $1;
+ }
+
+ # Get the configs that select this config
+ } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
+ if (defined($depends{$1})) {
+ $depends{$1} .= " " . $config;
+ } else {
+ $depends{$1} = $config;
+ }
+
+ # Check for if statements
+ } elsif (/^if\s+(.*\S)\s*$/) {
+ 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("$builddir/$kconfig");
+ }
+ }
+}
+
+sub read_depends {
+ # find out which arch this is by the kconfig file
+ open (IN, $output_config)
+ or dodie "Failed to read $output_config";
+ my $arch;
+ while (<IN>) {
+ if (m,Linux/(\S+)\s+\S+\s+Kernel Configuration,) {
+ $arch = $1;
+ last;
+ }
+ }
+ close IN;
+
+ if (!defined($arch)) {
+ doprint "Could not find arch from config file\n";
+ doprint "no dependencies used\n";
+ return;
+ }
+
+ # arch is really the subarch, we need to know
+ # what directory to look at.
+ if ($arch eq "i386" || $arch eq "x86_64") {
+ $arch = "x86";
+ } elsif ($arch =~ /^tile/) {
+ $arch = "tile";
+ }
+
+ my $kconfig = "$builddir/arch/$arch/Kconfig";
+
+ if (! -f $kconfig && $arch =~ /\d$/) {
+ my $orig = $arch;
+ # some subarchs have numbers, truncate them
+ $arch =~ s/\d*$//;
+ $kconfig = "$builddir/arch/$arch/Kconfig";
+ if (! -f $kconfig) {
+ doprint "No idea what arch dir $orig is for\n";
+ doprint "no dependencies used\n";
+ return;
+ }
+ }
+
+ read_kconfig($kconfig);
+}
+
sub read_config_list {
my ($config) = @_;
close OUT;
}
+sub get_depends {
+ my ($dep) = @_;
+
+ my $kconfig = $dep;
+ $kconfig =~ s/CONFIG_//;
+
+ $dep = $depends{"$kconfig"};
+
+ # the dep string we have saves the dependencies as they
+ # were found, including expressions like ! && ||. We
+ # want to split this out into just an array of configs.
+
+ my $valid = "A-Za-z_0-9";
+
+ my @configs;
+
+ while ($dep =~ /[$valid]/) {
+
+ if ($dep =~ /^[^$valid]*([$valid]+)/) {
+ my $conf = "CONFIG_" . $1;
+
+ $configs[$#configs + 1] = $conf;
+
+ $dep =~ s/^[^$valid]*[$valid]+//;
+ } else {
+ die "this should never happen";
+ }
+ }
+
+ return @configs;
+}
+
+my %min_configs;
+my %keep_configs;
+my %processed_configs;
+my %nochange_config;
+
+sub test_this_config {
+ my ($config) = @_;
+
+ my $found;
+
+ # if we already processed this config, skip it
+ if (defined($processed_configs{$config})) {
+ return undef;
+ }
+ $processed_configs{$config} = 1;
+
+ # if this config failed during this round, skip it
+ if (defined($nochange_config{$config})) {
+ return undef;
+ }
+
+ my $kconfig = $config;
+ $kconfig =~ s/CONFIG_//;
+
+ # Test dependencies first
+ if (defined($depends{"$kconfig"})) {
+ my @parents = get_depends $config;
+ foreach my $parent (@parents) {
+ # if the parent is in the min config, check it first
+ next if (!defined($min_configs{$parent}));
+ $found = test_this_config($parent);
+ if (defined($found)) {
+ return $found;
+ }
+ }
+ }
+
+ # Remove this config from the list of configs
+ # do a make oldnoconfig and then read the resulting
+ # .config to make sure it is missing the config that
+ # we had before
+ my %configs = %min_configs;
+ delete $configs{$config};
+ make_new_config ((values %configs), (values %keep_configs));
+ make_oldconfig;
+ undef %configs;
+ assign_configs \%configs, $output_config;
+
+ return $config if (!defined($configs{$config}));
+
+ doprint "disabling config $config did not change .config\n";
+
+ $nochange_config{$config} = 1;
+
+ return undef;
+}
+
sub make_min_config {
my ($i) = @_;
run_command "$make allnoconfig" or return 0;
+ read_depends;
+
process_config_ignore $output_config;
- my %keep_configs;
+
+ undef %keep_configs;
+ undef %min_configs;
if (defined($ignore_config)) {
# make sure the file exists
# Look at the current min configs, and save off all the
# ones that were set via the allnoconfig
- my %min_configs;
assign_configs \%min_configs, $start_minconfig;
my @config_keys = keys %min_configs;
}
}
- my %nochange_config;
-
my $done = 0;
+ my $take_two = 0;
while (!$done) {
undef %nochange_config;
}
- foreach my $config (@test_configs) {
+ undef %processed_configs;
- # Remove this config from the list of configs
- # do a make oldnoconfig and then read the resulting
- # .config to make sure it is missing the config that
- # we had before
- my %configs = %min_configs;
- delete $configs{$config};
- make_new_config ((values %configs), (values %keep_configs));
- make_oldconfig;
- undef %configs;
- assign_configs \%configs, $output_config;
+ foreach my $config (@test_configs) {
- if (!defined($configs{$config})) {
- $found = $config;
- last;
- }
+ $found = test_this_config $config;
- doprint "disabling config $config did not change .config\n";
+ last if (defined($found));
# oh well, try another config
- $nochange_config{$config} = 1;
}
if (!defined($found)) {
+ # we could have failed due to the nochange_config hash
+ # reset and try again
+ if (!$take_two) {
+ undef %nochange_config;
+ $take_two = 1;
+ next;
+ }
doprint "No more configs found that we can disable\n";
$done = 1;
last;
}
+ $take_two = 0;
$config = $found;
$in_bisect = 0;
if ($failed) {
- doprint "$config is needed to boot the box... keeping\n";
+ doprint "$min_configs{$config} is needed to boot the box... keeping\n";
# this config is needed, add it to the ignore list.
$keep_configs{$config} = $min_configs{$config};
delete $min_configs{$config};
git.openpandora.org / pandora-kernel.git / commitdiff