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Steven Rostedtdcc60242009-04-29 22:52:21 -04001#!/usr/bin/perl -w
2#
Uwe Kleine-Königcce1dac2011-01-24 21:12:01 +01003# Copyright 2005-2009 - Steven Rostedt
Steven Rostedtdcc60242009-04-29 22:52:21 -04004# Licensed under the terms of the GNU GPL License version 2
5#
6# It's simple enough to figure out how this works.
7# If not, then you can ask me at stripconfig@goodmis.org
8#
9# What it does?
10#
11# If you have installed a Linux kernel from a distribution
12# that turns on way too many modules than you need, and
13# you only want the modules you use, then this program
14# is perfect for you.
15#
16# It gives you the ability to turn off all the modules that are
17# not loaded on your system.
18#
19# Howto:
20#
21# 1. Boot up the kernel that you want to stream line the config on.
22# 2. Change directory to the directory holding the source of the
23# kernel that you just booted.
24# 3. Copy the configuraton file to this directory as .config
25# 4. Have all your devices that you need modules for connected and
26# operational (make sure that their corresponding modules are loaded)
27# 5. Run this script redirecting the output to some other file
28# like config_strip.
29# 6. Back up your old config (if you want too).
30# 7. copy the config_strip file to .config
31# 8. Run "make oldconfig"
32#
33# Now your kernel is ready to be built with only the modules that
34# are loaded.
35#
36# Here's what I did with my Debian distribution.
37#
38# cd /usr/src/linux-2.6.10
39# cp /boot/config-2.6.10-1-686-smp .config
40# ~/bin/streamline_config > config_strip
41# mv .config config_sav
42# mv config_strip .config
43# make oldconfig
44#
hiromucf5a1892010-08-17 19:49:18 +090045use strict;
Arnaud Lacombe22d550a2011-07-20 00:40:09 -040046use Getopt::Long;
hiromucf5a1892010-08-17 19:49:18 +090047
Steven Rostedt45033792012-06-18 22:41:15 -040048# set the environment variable LOCALMODCONFIG_DEBUG to get
49# debug output.
50my $debugprint = 0;
51$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
52
53sub dprint {
54 return if (!$debugprint);
55 print STDERR @_;
56}
57
Steven Rostedtdcc60242009-04-29 22:52:21 -040058my $config = ".config";
Steven Rostedtdcc60242009-04-29 22:52:21 -040059
Steven Rostedtcdfc4792009-04-30 14:39:48 -040060my $uname = `uname -r`;
61chomp $uname;
62
63my @searchconfigs = (
64 {
Steven Rostedta9024832009-05-07 11:01:34 -040065 "file" => ".config",
66 "exec" => "cat",
67 },
68 {
Steven Rostedtcdfc4792009-04-30 14:39:48 -040069 "file" => "/proc/config.gz",
70 "exec" => "zcat",
71 },
72 {
Steven Rostedt810b2be2009-04-30 19:30:04 -040073 "file" => "/boot/config-$uname",
74 "exec" => "cat",
75 },
76 {
Steven Rostedtcdfc4792009-04-30 14:39:48 -040077 "file" => "/boot/vmlinuz-$uname",
78 "exec" => "scripts/extract-ikconfig",
79 "test" => "scripts/extract-ikconfig",
80 },
81 {
82 "file" => "vmlinux",
83 "exec" => "scripts/extract-ikconfig",
84 "test" => "scripts/extract-ikconfig",
85 },
86 {
87 "file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
88 "exec" => "scripts/extract-ikconfig",
89 "test" => "scripts/extract-ikconfig",
90 },
91 {
92 "file" => "kernel/configs.ko",
93 "exec" => "scripts/extract-ikconfig",
94 "test" => "scripts/extract-ikconfig",
95 },
96 {
97 "file" => "kernel/configs.o",
98 "exec" => "scripts/extract-ikconfig",
99 "test" => "scripts/extract-ikconfig",
100 },
Steven Rostedtcdfc4792009-04-30 14:39:48 -0400101);
102
Bill Pemberton3f0c5412012-08-09 09:23:21 -0400103sub read_config {
Steven Rostedtcdfc4792009-04-30 14:39:48 -0400104 foreach my $conf (@searchconfigs) {
105 my $file = $conf->{"file"};
106
107 next if ( ! -f "$file");
108
109 if (defined($conf->{"test"})) {
110 `$conf->{"test"} $conf->{"file"} 2>/dev/null`;
111 next if ($?);
112 }
113
114 my $exec = $conf->{"exec"};
115
116 print STDERR "using config: '$file'\n";
117
Bill Pemberton3f0c5412012-08-09 09:23:21 -0400118 open(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file";
119 my @x = <$infile>;
120 close $infile;
121 return @x;
Steven Rostedtcdfc4792009-04-30 14:39:48 -0400122 }
123 die "No config file found";
124}
125
Bill Pemberton3f0c5412012-08-09 09:23:21 -0400126my @config_file = read_config;
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400127
Arnaud Lacombe22d550a2011-07-20 00:40:09 -0400128# Parse options
129my $localmodconfig = 0;
130my $localyesconfig = 0;
131
132GetOptions("localmodconfig" => \$localmodconfig,
133 "localyesconfig" => \$localyesconfig);
134
Steven Rostedt463bf902009-11-20 09:21:12 -0500135# Get the build source and top level Kconfig file (passed in)
Bill Pemberton224a2572012-08-09 09:23:20 -0400136my $ksource = ($ARGV[0] ? $ARGV[0] : '.');
Steven Rostedt463bf902009-11-20 09:21:12 -0500137my $kconfig = $ARGV[1];
Arnaud Lacombef597a712011-07-01 17:45:31 -0400138my $lsmod_file = $ENV{'LSMOD'};
Steven Rostedt463bf902009-11-20 09:21:12 -0500139
Richard Weinbergerc0ddc8c2015-07-27 00:06:55 +0200140my @makefiles = `find $ksource -name Makefile -or -name Kbuild 2>/dev/null`;
Toralf Förster17431922010-05-26 20:22:02 +0200141chomp @makefiles;
142
Steven Rostedtdcc60242009-04-29 22:52:21 -0400143my %depends;
144my %selects;
145my %prompts;
146my %objects;
147my $var;
Steven Rostedt13d7e932010-01-06 17:56:12 -0500148my $iflevel = 0;
149my @ifdeps;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400150
Steven Rostedtdcc60242009-04-29 22:52:21 -0400151# prevent recursion
152my %read_kconfigs;
153
154sub read_kconfig {
155 my ($kconfig) = @_;
156
157 my $state = "NONE";
158 my $config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400159
Steven Rostedt20d19042010-10-28 22:13:51 -0400160 my $cont = 0;
161 my $line;
162
Steven Rostedt49089802010-10-29 00:56:46 -0400163 my $source = "$ksource/$kconfig";
164 my $last_source = "";
165
166 # Check for any environment variables used
167 while ($source =~ /\$(\w+)/ && $last_source ne $source) {
168 my $env = $1;
169 $last_source = $source;
170 $source =~ s/\$$env/$ENV{$env}/;
171 }
172
Bill Pembertone0d28692012-08-09 09:23:22 -0400173 open(my $kinfile, '<', $source) || die "Can't open $kconfig";
174 while (<$kinfile>) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400175 chomp;
176
Steven Rostedt20d19042010-10-28 22:13:51 -0400177 # Make sure that lines ending with \ continue
178 if ($cont) {
179 $_ = $line . " " . $_;
180 }
181
182 if (s/\\$//) {
183 $cont = 1;
184 $line = $_;
185 next;
186 }
187
188 $cont = 0;
189
Steven Rostedtdcc60242009-04-29 22:52:21 -0400190 # collect any Kconfig sources
Benjamin Poirier296471a2016-04-02 10:55:21 -0700191 if (/^source\s+"?([^"]+)/) {
Steven Rostedtced9cb12013-04-29 15:18:38 -0400192 my $kconfig = $1;
193 # prevent reading twice.
194 if (!defined($read_kconfigs{$kconfig})) {
195 $read_kconfigs{$kconfig} = 1;
196 read_kconfig($kconfig);
197 }
198 next;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400199 }
200
201 # configs found
Steven Rostedt8ef17fa2010-10-28 22:21:57 -0400202 if (/^\s*(menu)?config\s+(\S+)\s*$/) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400203 $state = "NEW";
Steven Rostedt8ef17fa2010-10-28 22:21:57 -0400204 $config = $2;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400205
Steven Rostedt0b58a992012-06-18 14:09:22 -0400206 # Add depends for 'if' nesting
Steven Rostedt13d7e932010-01-06 17:56:12 -0500207 for (my $i = 0; $i < $iflevel; $i++) {
208 if ($i) {
209 $depends{$config} .= " " . $ifdeps[$i];
210 } else {
211 $depends{$config} = $ifdeps[$i];
212 }
213 $state = "DEP";
214 }
215
Steven Rostedtdcc60242009-04-29 22:52:21 -0400216 # collect the depends for the config
217 } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
218 $state = "DEP";
219 $depends{$config} = $1;
220 } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
221 $depends{$config} .= " " . $1;
Steven Rostedt (Red Hat)95edca52013-12-18 12:35:20 -0500222 } elsif ($state eq "DEP" && /^\s*def(_(bool|tristate)|ault)\s+(\S.*)$/) {
223 my $dep = $3;
224 if ($dep !~ /^\s*(y|m|n)\s*$/) {
225 $dep =~ s/.*\sif\s+//;
226 $depends{$config} .= " " . $dep;
227 dprint "Added default depends $dep to $config\n";
228 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400229
230 # Get the configs that select this config
231 } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
Steven Rostedt0b58a992012-06-18 14:09:22 -0400232 my $conf = $1;
233 if (defined($selects{$conf})) {
234 $selects{$conf} .= " " . $config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400235 } else {
Steven Rostedt0b58a992012-06-18 14:09:22 -0400236 $selects{$conf} = $config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400237 }
238
239 # configs without prompts must be selected
240 } elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
241 # note if the config has a prompt
hiromu yaguraccece602010-08-15 13:13:17 +0900242 $prompts{$config} = 1;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400243
Steven Rostedt13d7e932010-01-06 17:56:12 -0500244 # Check for if statements
245 } elsif (/^if\s+(.*\S)\s*$/) {
246 my $deps = $1;
247 # remove beginning and ending non text
248 $deps =~ s/^[^a-zA-Z0-9_]*//;
249 $deps =~ s/[^a-zA-Z0-9_]*$//;
250
251 my @deps = split /[^a-zA-Z0-9_]+/, $deps;
252
253 $ifdeps[$iflevel++] = join ':', @deps;
254
255 } elsif (/^endif/) {
256
257 $iflevel-- if ($iflevel);
258
Benjamin Poirier27b71562016-04-10 17:06:30 -0700259 # stop on "help" and keywords that end a menu entry
Benjamin Poiriera77ed522016-04-10 17:06:31 -0700260 } elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400261 $state = "NONE";
262 }
263 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400264 close($kinfile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400265}
266
267if ($kconfig) {
268 read_kconfig($kconfig);
269}
270
Steven Rostedt0b58a992012-06-18 14:09:22 -0400271# Makefiles can use variables to define their dependencies
Steven Rostedt364212f2012-01-13 17:53:40 -0500272sub convert_vars {
273 my ($line, %vars) = @_;
274
275 my $process = "";
276
277 while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
278 my $start = $1;
279 my $variable = $2;
280 my $var = $3;
281
282 if (defined($vars{$var})) {
283 $process .= $start . $vars{$var};
284 } else {
285 $process .= $start . $variable;
286 }
287 }
288
289 $process .= $line;
290
291 return $process;
292}
293
Steven Rostedtdcc60242009-04-29 22:52:21 -0400294# Read all Makefiles to map the configs to the objects
295foreach my $makefile (@makefiles) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400296
Steven Rostedtd060d962012-01-13 17:50:39 -0500297 my $line = "";
Steven Rostedt364212f2012-01-13 17:53:40 -0500298 my %make_vars;
Steven Rostedt20d19042010-10-28 22:13:51 -0400299
Bill Pembertone0d28692012-08-09 09:23:22 -0400300 open(my $infile, '<', $makefile) || die "Can't open $makefile";
301 while (<$infile>) {
Steven Rostedtd060d962012-01-13 17:50:39 -0500302 # if this line ends with a backslash, continue
303 chomp;
304 if (/^(.*)\\$/) {
305 $line .= $1;
306 next;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400307 }
Steven Rostedtd060d962012-01-13 17:50:39 -0500308
309 $line .= $_;
310 $_ = $line;
311 $line = "";
312
313 my $objs;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400314
Steven Rostedt0b58a992012-06-18 14:09:22 -0400315 # Convert variables in a line (could define configs)
Steven Rostedt364212f2012-01-13 17:53:40 -0500316 $_ = convert_vars($_, %make_vars);
317
Steven Rostedtdcc60242009-04-29 22:52:21 -0400318 # collect objects after obj-$(CONFIG_FOO_BAR)
319 if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
320 $var = $1;
321 $objs = $2;
Steven Rostedt364212f2012-01-13 17:53:40 -0500322
323 # check if variables are set
324 } elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
325 $make_vars{$1} = $2;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400326 }
327 if (defined($objs)) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400328 foreach my $obj (split /\s+/,$objs) {
329 $obj =~ s/-/_/g;
330 if ($obj =~ /(.*)\.o$/) {
Toralf Foerster1d1d1fe2010-05-28 10:25:52 +0200331 # Objects may be enabled by more than one config.
Steven Rostedtdcc60242009-04-29 22:52:21 -0400332 # Store configs in an array.
333 my @arr;
334
335 if (defined($objects{$1})) {
336 @arr = @{$objects{$1}};
337 }
338
339 $arr[$#arr+1] = $var;
340
341 # The objects have a hash mapping to a reference
342 # of an array of configs.
343 $objects{$1} = \@arr;
344 }
345 }
346 }
347 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400348 close($infile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400349}
350
351my %modules;
Bill Pembertone0d28692012-08-09 09:23:22 -0400352my $linfile;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400353
Steven Rostedt615f0832010-02-02 21:51:27 -0500354if (defined($lsmod_file)) {
355 if ( ! -f $lsmod_file) {
Arnaud Lacombef597a712011-07-01 17:45:31 -0400356 if ( -f $ENV{'objtree'}."/".$lsmod_file) {
357 $lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
358 } else {
359 die "$lsmod_file not found";
360 }
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500361 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400362
363 my $otype = ( -x $lsmod_file) ? '-|' : '<';
364 open($linfile, $otype, $lsmod_file);
365
Steven Rostedt615f0832010-02-02 21:51:27 -0500366} else {
367
368 # see what modules are loaded on this system
369 my $lsmod;
370
hiromucf5a1892010-08-17 19:49:18 +0900371 foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
Steven Rostedt615f0832010-02-02 21:51:27 -0500372 if ( -x "$dir/lsmod" ) {
373 $lsmod = "$dir/lsmod";
374 last;
375 }
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500376}
Steven Rostedt615f0832010-02-02 21:51:27 -0500377 if (!defined($lsmod)) {
378 # try just the path
379 $lsmod = "lsmod";
380 }
381
Bill Pembertone0d28692012-08-09 09:23:22 -0400382 open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500383}
384
Bill Pembertone0d28692012-08-09 09:23:22 -0400385while (<$linfile>) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400386 next if (/^Module/); # Skip the first line.
387 if (/^(\S+)/) {
388 $modules{$1} = 1;
389 }
390}
Bill Pembertone0d28692012-08-09 09:23:22 -0400391close ($linfile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400392
393# add to the configs hash all configs that are needed to enable
Steven Rostedt0b58a992012-06-18 14:09:22 -0400394# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
395# where we know we need bar.o so we add FOO to the list.
Steven Rostedtdcc60242009-04-29 22:52:21 -0400396my %configs;
397foreach my $module (keys(%modules)) {
398 if (defined($objects{$module})) {
Toralf Foerstere5199ed2010-05-28 10:24:59 +0200399 my @arr = @{$objects{$module}};
Steven Rostedtdcc60242009-04-29 22:52:21 -0400400 foreach my $conf (@arr) {
401 $configs{$conf} = $module;
Steven Rostedt45033792012-06-18 22:41:15 -0400402 dprint "$conf added by direct ($module)\n";
Steven Rostedtbc20d122013-04-29 15:17:40 -0400403 if ($debugprint) {
404 my $c=$conf;
405 $c =~ s/^CONFIG_//;
406 if (defined($depends{$c})) {
407 dprint " deps = $depends{$c}\n";
408 } else {
409 dprint " no deps\n";
410 }
411 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400412 }
413 } else {
414 # Most likely, someone has a custom (binary?) module loaded.
415 print STDERR "$module config not found!!\n";
416 }
417}
418
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400419# Read the current config, and see what is enabled. We want to
420# ignore configs that we would not enable anyway.
421
422my %orig_configs;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400423my $valid = "A-Za-z_0-9";
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400424
425foreach my $line (@config_file) {
426 $_ = $line;
427
428 if (/(CONFIG_[$valid]*)=(m|y)/) {
429 $orig_configs{$1} = $2;
430 }
431}
432
Steven Rostedtdcc60242009-04-29 22:52:21 -0400433my $repeat = 1;
434
Steven Rostedt45033792012-06-18 22:41:15 -0400435my $depconfig;
436
Steven Rostedtdcc60242009-04-29 22:52:21 -0400437#
438# Note, we do not care about operands (like: &&, ||, !) we want to add any
439# config that is in the depend list of another config. This script does
440# not enable configs that are not already enabled. If we come across a
441# config A that depends on !B, we can still add B to the list of depends
442# to keep on. If A was on in the original config, B would not have been
443# and B would not be turned on by this script.
444#
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400445sub parse_config_depends
Steven Rostedtdcc60242009-04-29 22:52:21 -0400446{
447 my ($p) = @_;
448
449 while ($p =~ /[$valid]/) {
450
451 if ($p =~ /^[^$valid]*([$valid]+)/) {
452 my $conf = "CONFIG_" . $1;
453
454 $p =~ s/^[^$valid]*[$valid]+//;
455
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400456 # We only need to process if the depend config is a module
Benjamin Poirier51691922016-04-10 17:06:32 -0700457 if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") {
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400458 next;
459 }
460
Steven Rostedtdcc60242009-04-29 22:52:21 -0400461 if (!defined($configs{$conf})) {
462 # We must make sure that this config has its
463 # dependencies met.
464 $repeat = 1; # do again
Steven Rostedt45033792012-06-18 22:41:15 -0400465 dprint "$conf selected by depend $depconfig\n";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400466 $configs{$conf} = 1;
467 }
468 } else {
469 die "this should never happen";
470 }
471 }
472}
473
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400474# Select is treated a bit differently than depends. We call this
475# when a config has no prompt and requires another config to be
476# selected. We use to just select all configs that selected this
477# config, but found that that can balloon into enabling hundreds
478# of configs that we do not care about.
479#
480# The idea is we look at all the configs that select it. If one
481# is already in our list of configs to enable, then there's nothing
482# else to do. If there isn't, we pick the first config that was
483# enabled in the orignal config and use that.
484sub parse_config_selects
485{
486 my ($config, $p) = @_;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400487
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400488 my $next_config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400489
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400490 while ($p =~ /[$valid]/) {
491
492 if ($p =~ /^[^$valid]*([$valid]+)/) {
493 my $conf = "CONFIG_" . $1;
494
495 $p =~ s/^[^$valid]*[$valid]+//;
496
497 # Make sure that this config exists in the current .config file
498 if (!defined($orig_configs{$conf})) {
Steven Rostedt45033792012-06-18 22:41:15 -0400499 dprint "$conf not set for $config select\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400500 next;
501 }
502
503 # Check if something other than a module selects this config
504 if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
Steven Rostedt45033792012-06-18 22:41:15 -0400505 dprint "$conf (non module) selects config, we are good\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400506 # we are good with this
507 return;
508 }
509 if (defined($configs{$conf})) {
Steven Rostedt45033792012-06-18 22:41:15 -0400510 dprint "$conf selects $config so we are good\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400511 # A set config selects this config, we are good
512 return;
513 }
514 # Set this config to be selected
515 if (!defined($next_config)) {
516 $next_config = $conf;
517 }
518 } else {
519 die "this should never happen";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400520 }
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400521 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400522
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400523 # If no possible config selected this, then something happened.
524 if (!defined($next_config)) {
525 print STDERR "WARNING: $config is required, but nothing in the\n";
526 print STDERR " current config selects it.\n";
527 return;
528 }
529
530 # If we are here, then we found no config that is set and
531 # selects this config. Repeat.
532 $repeat = 1;
533 # Make this config need to be selected
534 $configs{$next_config} = 1;
Steven Rostedt45033792012-06-18 22:41:15 -0400535 dprint "$next_config selected by select $config\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400536}
537
538my %process_selects;
539
540# loop through all configs, select their dependencies.
541sub loop_depend {
542 $repeat = 1;
543
544 while ($repeat) {
545 $repeat = 0;
546
547 forloop:
548 foreach my $config (keys %configs) {
549
550 # If this config is not a module, we do not need to process it
551 if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
552 next forloop;
553 }
554
555 $config =~ s/^CONFIG_//;
Steven Rostedt45033792012-06-18 22:41:15 -0400556 $depconfig = $config;
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400557
558 if (defined($depends{$config})) {
559 # This config has dependencies. Make sure they are also included
560 parse_config_depends $depends{$config};
561 }
562
563 # If the config has no prompt, then we need to check if a config
564 # that is enabled selected it. Or if we need to enable one.
565 if (!defined($prompts{$config}) && defined($selects{$config})) {
566 $process_selects{$config} = 1;
567 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400568 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400569 }
570}
571
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400572sub loop_select {
573
574 foreach my $config (keys %process_selects) {
575 $config =~ s/^CONFIG_//;
576
Steven Rostedt45033792012-06-18 22:41:15 -0400577 dprint "Process select $config\n";
578
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400579 # config has no prompt and must be selected.
580 parse_config_selects $config, $selects{$config};
581 }
582}
583
584while ($repeat) {
585 # Get the first set of configs and their dependencies.
586 loop_depend;
587
588 $repeat = 0;
589
590 # Now we need to see if we have to check selects;
591 loop_select;
Masahiro Yamada38385f82014-04-28 16:26:18 +0900592}
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400593
Steven Rostedtdcc60242009-04-29 22:52:21 -0400594my %setconfigs;
595
596# Finally, read the .config file and turn off any module enabled that
597# we could not find a reason to keep enabled.
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400598foreach my $line (@config_file) {
599 $_ = $line;
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400600
601 if (/CONFIG_IKCONFIG/) {
602 if (/# CONFIG_IKCONFIG is not set/) {
603 # enable IKCONFIG at least as a module
604 print "CONFIG_IKCONFIG=m\n";
605 # don't ask about PROC
Steven Rostedtd08ca272009-04-30 19:24:00 -0400606 print "# CONFIG_IKCONFIG_PROC is not set\n";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400607 } else {
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400608 print;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400609 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400610 next;
611 }
612
613 if (/^(CONFIG.*)=(m|y)/) {
614 if (defined($configs{$1})) {
Arnaud Lacombe22d550a2011-07-20 00:40:09 -0400615 if ($localyesconfig) {
616 $setconfigs{$1} = 'y';
Yuta Ando4eae5182012-10-01 23:24:30 +0900617 print "$1=y\n";
618 next;
Arnaud Lacombe22d550a2011-07-20 00:40:09 -0400619 } else {
620 $setconfigs{$1} = $2;
621 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400622 } elsif ($2 eq "m") {
623 print "# $1 is not set\n";
Steven Rostedtd08ca272009-04-30 19:24:00 -0400624 next;
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400625 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400626 }
Steven Rostedtd08ca272009-04-30 19:24:00 -0400627 print;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400628}
Steven Rostedtdcc60242009-04-29 22:52:21 -0400629
630# Integrity check, make sure all modules that we want enabled do
631# indeed have their configs set.
632loop:
633foreach my $module (keys(%modules)) {
634 if (defined($objects{$module})) {
635 my @arr = @{$objects{$module}};
636 foreach my $conf (@arr) {
637 if (defined($setconfigs{$conf})) {
638 next loop;
639 }
640 }
641 print STDERR "module $module did not have configs";
642 foreach my $conf (@arr) {
643 print STDERR " " , $conf;
644 }
645 print STDERR "\n";
646 }
647}