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-rw-r--r--scripts/kconfig/streamline_config.pl175
1 files changed, 158 insertions, 17 deletions
diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
index bccf07ddd0b6..2fbbbc1ddea0 100644
--- a/scripts/kconfig/streamline_config.pl
+++ b/scripts/kconfig/streamline_config.pl
@@ -45,6 +45,16 @@
use strict;
use Getopt::Long;
+# set the environment variable LOCALMODCONFIG_DEBUG to get
+# debug output.
+my $debugprint = 0;
+$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
+
+sub dprint {
+ return if (!$debugprint);
+ print STDERR @_;
+}
+
my $config = ".config";
my $uname = `uname -r`;
@@ -113,6 +123,10 @@ sub find_config {
find_config;
+# Read in the entire config file into config_file
+my @config_file = <CIN>;
+close CIN;
+
# Parse options
my $localmodconfig = 0;
my $localyesconfig = 0;
@@ -186,6 +200,7 @@ sub read_kconfig {
$state = "NEW";
$config = $2;
+ # Add depends for 'if' nesting
for (my $i = 0; $i < $iflevel; $i++) {
if ($i) {
$depends{$config} .= " " . $ifdeps[$i];
@@ -204,10 +219,11 @@ sub read_kconfig {
# Get the configs that select this config
} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
- if (defined($selects{$1})) {
- $selects{$1} .= " " . $config;
+ my $conf = $1;
+ if (defined($selects{$conf})) {
+ $selects{$conf} .= " " . $config;
} else {
- $selects{$1} = $config;
+ $selects{$conf} = $config;
}
# configs without prompts must be selected
@@ -250,6 +266,7 @@ if ($kconfig) {
read_kconfig($kconfig);
}
+# Makefiles can use variables to define their dependencies
sub convert_vars {
my ($line, %vars) = @_;
@@ -293,6 +310,7 @@ foreach my $makefile (@makefiles) {
my $objs;
+ # Convert variables in a line (could define configs)
$_ = convert_vars($_, %make_vars);
# collect objects after obj-$(CONFIG_FOO_BAR)
@@ -373,13 +391,15 @@ while (<LIN>) {
close (LIN);
# add to the configs hash all configs that are needed to enable
-# a loaded module.
+# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
+# where we know we need bar.o so we add FOO to the list.
my %configs;
foreach my $module (keys(%modules)) {
if (defined($objects{$module})) {
my @arr = @{$objects{$module}};
foreach my $conf (@arr) {
$configs{$conf} = $module;
+ dprint "$conf added by direct ($module)\n";
}
} else {
# Most likely, someone has a custom (binary?) module loaded.
@@ -387,9 +407,24 @@ foreach my $module (keys(%modules)) {
}
}
+# Read the current config, and see what is enabled. We want to
+# ignore configs that we would not enable anyway.
+
+my %orig_configs;
my $valid = "A-Za-z_0-9";
+
+foreach my $line (@config_file) {
+ $_ = $line;
+
+ if (/(CONFIG_[$valid]*)=(m|y)/) {
+ $orig_configs{$1} = $2;
+ }
+}
+
my $repeat = 1;
+my $depconfig;
+
#
# 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
@@ -398,7 +433,7 @@ my $repeat = 1;
# to keep on. If A was on in the original config, B would not have been
# and B would not be turned on by this script.
#
-sub parse_config_dep_select
+sub parse_config_depends
{
my ($p) = @_;
@@ -409,10 +444,16 @@ sub parse_config_dep_select
$p =~ s/^[^$valid]*[$valid]+//;
+ # We only need to process if the depend config is a module
+ if (!defined($orig_configs{$conf}) || !$orig_configs{conf} eq "m") {
+ next;
+ }
+
if (!defined($configs{$conf})) {
# We must make sure that this config has its
# dependencies met.
$repeat = 1; # do again
+ dprint "$conf selected by depend $depconfig\n";
$configs{$conf} = 1;
}
} else {
@@ -421,31 +462,132 @@ sub parse_config_dep_select
}
}
-while ($repeat) {
- $repeat = 0;
+# Select is treated a bit differently than depends. We call this
+# when a config has no prompt and requires another config to be
+# selected. We use to just select all configs that selected this
+# config, but found that that can balloon into enabling hundreds
+# of configs that we do not care about.
+#
+# The idea is we look at all the configs that select it. If one
+# is already in our list of configs to enable, then there's nothing
+# else to do. If there isn't, we pick the first config that was
+# enabled in the orignal config and use that.
+sub parse_config_selects
+{
+ my ($config, $p) = @_;
- foreach my $config (keys %configs) {
- $config =~ s/^CONFIG_//;
+ my $next_config;
+
+ while ($p =~ /[$valid]/) {
- if (defined($depends{$config})) {
- # This config has dependencies. Make sure they are also included
- parse_config_dep_select $depends{$config};
+ if ($p =~ /^[^$valid]*([$valid]+)/) {
+ my $conf = "CONFIG_" . $1;
+
+ $p =~ s/^[^$valid]*[$valid]+//;
+
+ # Make sure that this config exists in the current .config file
+ if (!defined($orig_configs{$conf})) {
+ dprint "$conf not set for $config select\n";
+ next;
+ }
+
+ # Check if something other than a module selects this config
+ if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
+ dprint "$conf (non module) selects config, we are good\n";
+ # we are good with this
+ return;
+ }
+ if (defined($configs{$conf})) {
+ dprint "$conf selects $config so we are good\n";
+ # A set config selects this config, we are good
+ return;
+ }
+ # Set this config to be selected
+ if (!defined($next_config)) {
+ $next_config = $conf;
+ }
+ } else {
+ die "this should never happen";
}
+ }
- if (defined($prompts{$config}) || !defined($selects{$config})) {
- next;
+ # If no possible config selected this, then something happened.
+ if (!defined($next_config)) {
+ print STDERR "WARNING: $config is required, but nothing in the\n";
+ print STDERR " current config selects it.\n";
+ return;
+ }
+
+ # If we are here, then we found no config that is set and
+ # selects this config. Repeat.
+ $repeat = 1;
+ # Make this config need to be selected
+ $configs{$next_config} = 1;
+ dprint "$next_config selected by select $config\n";
+}
+
+my %process_selects;
+
+# loop through all configs, select their dependencies.
+sub loop_depend {
+ $repeat = 1;
+
+ while ($repeat) {
+ $repeat = 0;
+
+ forloop:
+ foreach my $config (keys %configs) {
+
+ # If this config is not a module, we do not need to process it
+ if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
+ next forloop;
+ }
+
+ $config =~ s/^CONFIG_//;
+ $depconfig = $config;
+
+ if (defined($depends{$config})) {
+ # This config has dependencies. Make sure they are also included
+ parse_config_depends $depends{$config};
+ }
+
+ # If the config has no prompt, then we need to check if a config
+ # that is enabled selected it. Or if we need to enable one.
+ if (!defined($prompts{$config}) && defined($selects{$config})) {
+ $process_selects{$config} = 1;
+ }
}
+ }
+}
+
+sub loop_select {
+
+ foreach my $config (keys %process_selects) {
+ $config =~ s/^CONFIG_//;
+
+ dprint "Process select $config\n";
# config has no prompt and must be selected.
- parse_config_dep_select $selects{$config};
+ parse_config_selects $config, $selects{$config};
}
}
+while ($repeat) {
+ # Get the first set of configs and their dependencies.
+ loop_depend;
+
+ $repeat = 0;
+
+ # Now we need to see if we have to check selects;
+ loop_select;
+}
+
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>) {
+foreach my $line (@config_file) {
+ $_ = $line;
if (/CONFIG_IKCONFIG/) {
if (/# CONFIG_IKCONFIG is not set/) {
@@ -473,7 +615,6 @@ while(<CIN>) {
}
print;
}
-close(CIN);
# Integrity check, make sure all modules that we want enabled do
# indeed have their configs set.