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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
Toralf Förster17431922010-05-26 20:22:02 +0200140my @makefiles = `find $ksource -name Makefile 2>/dev/null`;
141chomp @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;
159 my @kconfigs;
160
Steven Rostedt20d19042010-10-28 22:13:51 -0400161 my $cont = 0;
162 my $line;
163
Steven Rostedt49089802010-10-29 00:56:46 -0400164 my $source = "$ksource/$kconfig";
165 my $last_source = "";
166
167 # Check for any environment variables used
168 while ($source =~ /\$(\w+)/ && $last_source ne $source) {
169 my $env = $1;
170 $last_source = $source;
171 $source =~ s/\$$env/$ENV{$env}/;
172 }
173
Bill Pembertone0d28692012-08-09 09:23:22 -0400174 open(my $kinfile, '<', $source) || die "Can't open $kconfig";
175 while (<$kinfile>) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400176 chomp;
177
Steven Rostedt20d19042010-10-28 22:13:51 -0400178 # Make sure that lines ending with \ continue
179 if ($cont) {
180 $_ = $line . " " . $_;
181 }
182
183 if (s/\\$//) {
184 $cont = 1;
185 $line = $_;
186 next;
187 }
188
189 $cont = 0;
190
Steven Rostedtdcc60242009-04-29 22:52:21 -0400191 # collect any Kconfig sources
192 if (/^source\s*"(.*)"/) {
193 $kconfigs[$#kconfigs+1] = $1;
194 }
195
196 # configs found
Steven Rostedt8ef17fa2010-10-28 22:21:57 -0400197 if (/^\s*(menu)?config\s+(\S+)\s*$/) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400198 $state = "NEW";
Steven Rostedt8ef17fa2010-10-28 22:21:57 -0400199 $config = $2;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400200
Steven Rostedt0b58a992012-06-18 14:09:22 -0400201 # Add depends for 'if' nesting
Steven Rostedt13d7e932010-01-06 17:56:12 -0500202 for (my $i = 0; $i < $iflevel; $i++) {
203 if ($i) {
204 $depends{$config} .= " " . $ifdeps[$i];
205 } else {
206 $depends{$config} = $ifdeps[$i];
207 }
208 $state = "DEP";
209 }
210
Steven Rostedtdcc60242009-04-29 22:52:21 -0400211 # collect the depends for the config
212 } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
213 $state = "DEP";
214 $depends{$config} = $1;
215 } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
216 $depends{$config} .= " " . $1;
217
218 # Get the configs that select this config
219 } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
Steven Rostedt0b58a992012-06-18 14:09:22 -0400220 my $conf = $1;
221 if (defined($selects{$conf})) {
222 $selects{$conf} .= " " . $config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400223 } else {
Steven Rostedt0b58a992012-06-18 14:09:22 -0400224 $selects{$conf} = $config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400225 }
226
227 # configs without prompts must be selected
228 } elsif ($state ne "NONE" && /^\s*tristate\s\S/) {
229 # note if the config has a prompt
hiromu yaguraccece602010-08-15 13:13:17 +0900230 $prompts{$config} = 1;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400231
Steven Rostedt13d7e932010-01-06 17:56:12 -0500232 # Check for if statements
233 } elsif (/^if\s+(.*\S)\s*$/) {
234 my $deps = $1;
235 # remove beginning and ending non text
236 $deps =~ s/^[^a-zA-Z0-9_]*//;
237 $deps =~ s/[^a-zA-Z0-9_]*$//;
238
239 my @deps = split /[^a-zA-Z0-9_]+/, $deps;
240
241 $ifdeps[$iflevel++] = join ':', @deps;
242
243 } elsif (/^endif/) {
244
245 $iflevel-- if ($iflevel);
246
Steven Rostedtdcc60242009-04-29 22:52:21 -0400247 # stop on "help"
248 } elsif (/^\s*help\s*$/) {
249 $state = "NONE";
250 }
251 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400252 close($kinfile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400253
254 # read in any configs that were found.
Bill Pemberton45f4c812012-08-09 09:23:23 -0400255 foreach my $kconfig (@kconfigs) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400256 if (!defined($read_kconfigs{$kconfig})) {
257 $read_kconfigs{$kconfig} = 1;
258 read_kconfig($kconfig);
259 }
260 }
261}
262
263if ($kconfig) {
264 read_kconfig($kconfig);
265}
266
Steven Rostedt0b58a992012-06-18 14:09:22 -0400267# Makefiles can use variables to define their dependencies
Steven Rostedt364212f2012-01-13 17:53:40 -0500268sub convert_vars {
269 my ($line, %vars) = @_;
270
271 my $process = "";
272
273 while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
274 my $start = $1;
275 my $variable = $2;
276 my $var = $3;
277
278 if (defined($vars{$var})) {
279 $process .= $start . $vars{$var};
280 } else {
281 $process .= $start . $variable;
282 }
283 }
284
285 $process .= $line;
286
287 return $process;
288}
289
Steven Rostedtdcc60242009-04-29 22:52:21 -0400290# Read all Makefiles to map the configs to the objects
291foreach my $makefile (@makefiles) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400292
Steven Rostedtd060d962012-01-13 17:50:39 -0500293 my $line = "";
Steven Rostedt364212f2012-01-13 17:53:40 -0500294 my %make_vars;
Steven Rostedt20d19042010-10-28 22:13:51 -0400295
Bill Pembertone0d28692012-08-09 09:23:22 -0400296 open(my $infile, '<', $makefile) || die "Can't open $makefile";
297 while (<$infile>) {
Steven Rostedtd060d962012-01-13 17:50:39 -0500298 # if this line ends with a backslash, continue
299 chomp;
300 if (/^(.*)\\$/) {
301 $line .= $1;
302 next;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400303 }
Steven Rostedtd060d962012-01-13 17:50:39 -0500304
305 $line .= $_;
306 $_ = $line;
307 $line = "";
308
309 my $objs;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400310
Steven Rostedt0b58a992012-06-18 14:09:22 -0400311 # Convert variables in a line (could define configs)
Steven Rostedt364212f2012-01-13 17:53:40 -0500312 $_ = convert_vars($_, %make_vars);
313
Steven Rostedtdcc60242009-04-29 22:52:21 -0400314 # collect objects after obj-$(CONFIG_FOO_BAR)
315 if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
316 $var = $1;
317 $objs = $2;
Steven Rostedt364212f2012-01-13 17:53:40 -0500318
319 # check if variables are set
320 } elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
321 $make_vars{$1} = $2;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400322 }
323 if (defined($objs)) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400324 foreach my $obj (split /\s+/,$objs) {
325 $obj =~ s/-/_/g;
326 if ($obj =~ /(.*)\.o$/) {
Toralf Foerster1d1d1fe2010-05-28 10:25:52 +0200327 # Objects may be enabled by more than one config.
Steven Rostedtdcc60242009-04-29 22:52:21 -0400328 # Store configs in an array.
329 my @arr;
330
331 if (defined($objects{$1})) {
332 @arr = @{$objects{$1}};
333 }
334
335 $arr[$#arr+1] = $var;
336
337 # The objects have a hash mapping to a reference
338 # of an array of configs.
339 $objects{$1} = \@arr;
340 }
341 }
342 }
343 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400344 close($infile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400345}
346
347my %modules;
Bill Pembertone0d28692012-08-09 09:23:22 -0400348my $linfile;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400349
Steven Rostedt615f0832010-02-02 21:51:27 -0500350if (defined($lsmod_file)) {
351 if ( ! -f $lsmod_file) {
Arnaud Lacombef597a712011-07-01 17:45:31 -0400352 if ( -f $ENV{'objtree'}."/".$lsmod_file) {
353 $lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
354 } else {
355 die "$lsmod_file not found";
356 }
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500357 }
Bill Pembertone0d28692012-08-09 09:23:22 -0400358
359 my $otype = ( -x $lsmod_file) ? '-|' : '<';
360 open($linfile, $otype, $lsmod_file);
361
Steven Rostedt615f0832010-02-02 21:51:27 -0500362} else {
363
364 # see what modules are loaded on this system
365 my $lsmod;
366
hiromucf5a1892010-08-17 19:49:18 +0900367 foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
Steven Rostedt615f0832010-02-02 21:51:27 -0500368 if ( -x "$dir/lsmod" ) {
369 $lsmod = "$dir/lsmod";
370 last;
371 }
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500372}
Steven Rostedt615f0832010-02-02 21:51:27 -0500373 if (!defined($lsmod)) {
374 # try just the path
375 $lsmod = "lsmod";
376 }
377
Bill Pembertone0d28692012-08-09 09:23:22 -0400378 open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
Steven Rostedt88f66ea2010-01-06 18:49:44 -0500379}
380
Bill Pembertone0d28692012-08-09 09:23:22 -0400381while (<$linfile>) {
Steven Rostedtdcc60242009-04-29 22:52:21 -0400382 next if (/^Module/); # Skip the first line.
383 if (/^(\S+)/) {
384 $modules{$1} = 1;
385 }
386}
Bill Pembertone0d28692012-08-09 09:23:22 -0400387close ($linfile);
Steven Rostedtdcc60242009-04-29 22:52:21 -0400388
389# add to the configs hash all configs that are needed to enable
Steven Rostedt0b58a992012-06-18 14:09:22 -0400390# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
391# where we know we need bar.o so we add FOO to the list.
Steven Rostedtdcc60242009-04-29 22:52:21 -0400392my %configs;
393foreach my $module (keys(%modules)) {
394 if (defined($objects{$module})) {
Toralf Foerstere5199ed2010-05-28 10:24:59 +0200395 my @arr = @{$objects{$module}};
Steven Rostedtdcc60242009-04-29 22:52:21 -0400396 foreach my $conf (@arr) {
397 $configs{$conf} = $module;
Steven Rostedt45033792012-06-18 22:41:15 -0400398 dprint "$conf added by direct ($module)\n";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400399 }
400 } else {
401 # Most likely, someone has a custom (binary?) module loaded.
402 print STDERR "$module config not found!!\n";
403 }
404}
405
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400406# Read the current config, and see what is enabled. We want to
407# ignore configs that we would not enable anyway.
408
409my %orig_configs;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400410my $valid = "A-Za-z_0-9";
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400411
412foreach my $line (@config_file) {
413 $_ = $line;
414
415 if (/(CONFIG_[$valid]*)=(m|y)/) {
416 $orig_configs{$1} = $2;
417 }
418}
419
Steven Rostedtdcc60242009-04-29 22:52:21 -0400420my $repeat = 1;
421
Steven Rostedt45033792012-06-18 22:41:15 -0400422my $depconfig;
423
Steven Rostedtdcc60242009-04-29 22:52:21 -0400424#
425# Note, we do not care about operands (like: &&, ||, !) we want to add any
426# config that is in the depend list of another config. This script does
427# not enable configs that are not already enabled. If we come across a
428# config A that depends on !B, we can still add B to the list of depends
429# to keep on. If A was on in the original config, B would not have been
430# and B would not be turned on by this script.
431#
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400432sub parse_config_depends
Steven Rostedtdcc60242009-04-29 22:52:21 -0400433{
434 my ($p) = @_;
435
436 while ($p =~ /[$valid]/) {
437
438 if ($p =~ /^[^$valid]*([$valid]+)/) {
439 my $conf = "CONFIG_" . $1;
440
441 $p =~ s/^[^$valid]*[$valid]+//;
442
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400443 # We only need to process if the depend config is a module
444 if (!defined($orig_configs{$conf}) || !$orig_configs{conf} eq "m") {
445 next;
446 }
447
Steven Rostedtdcc60242009-04-29 22:52:21 -0400448 if (!defined($configs{$conf})) {
449 # We must make sure that this config has its
450 # dependencies met.
451 $repeat = 1; # do again
Steven Rostedt45033792012-06-18 22:41:15 -0400452 dprint "$conf selected by depend $depconfig\n";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400453 $configs{$conf} = 1;
454 }
455 } else {
456 die "this should never happen";
457 }
458 }
459}
460
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400461# Select is treated a bit differently than depends. We call this
462# when a config has no prompt and requires another config to be
463# selected. We use to just select all configs that selected this
464# config, but found that that can balloon into enabling hundreds
465# of configs that we do not care about.
466#
467# The idea is we look at all the configs that select it. If one
468# is already in our list of configs to enable, then there's nothing
469# else to do. If there isn't, we pick the first config that was
470# enabled in the orignal config and use that.
471sub parse_config_selects
472{
473 my ($config, $p) = @_;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400474
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400475 my $next_config;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400476
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400477 while ($p =~ /[$valid]/) {
478
479 if ($p =~ /^[^$valid]*([$valid]+)/) {
480 my $conf = "CONFIG_" . $1;
481
482 $p =~ s/^[^$valid]*[$valid]+//;
483
484 # Make sure that this config exists in the current .config file
485 if (!defined($orig_configs{$conf})) {
Steven Rostedt45033792012-06-18 22:41:15 -0400486 dprint "$conf not set for $config select\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400487 next;
488 }
489
490 # Check if something other than a module selects this config
491 if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
Steven Rostedt45033792012-06-18 22:41:15 -0400492 dprint "$conf (non module) selects config, we are good\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400493 # we are good with this
494 return;
495 }
496 if (defined($configs{$conf})) {
Steven Rostedt45033792012-06-18 22:41:15 -0400497 dprint "$conf selects $config so we are good\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400498 # A set config selects this config, we are good
499 return;
500 }
501 # Set this config to be selected
502 if (!defined($next_config)) {
503 $next_config = $conf;
504 }
505 } else {
506 die "this should never happen";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400507 }
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400508 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400509
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400510 # If no possible config selected this, then something happened.
511 if (!defined($next_config)) {
512 print STDERR "WARNING: $config is required, but nothing in the\n";
513 print STDERR " current config selects it.\n";
514 return;
515 }
516
517 # If we are here, then we found no config that is set and
518 # selects this config. Repeat.
519 $repeat = 1;
520 # Make this config need to be selected
521 $configs{$next_config} = 1;
Steven Rostedt45033792012-06-18 22:41:15 -0400522 dprint "$next_config selected by select $config\n";
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400523}
524
525my %process_selects;
526
527# loop through all configs, select their dependencies.
528sub loop_depend {
529 $repeat = 1;
530
531 while ($repeat) {
532 $repeat = 0;
533
534 forloop:
535 foreach my $config (keys %configs) {
536
537 # If this config is not a module, we do not need to process it
538 if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
539 next forloop;
540 }
541
542 $config =~ s/^CONFIG_//;
Steven Rostedt45033792012-06-18 22:41:15 -0400543 $depconfig = $config;
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400544
545 if (defined($depends{$config})) {
546 # This config has dependencies. Make sure they are also included
547 parse_config_depends $depends{$config};
548 }
549
550 # If the config has no prompt, then we need to check if a config
551 # that is enabled selected it. Or if we need to enable one.
552 if (!defined($prompts{$config}) && defined($selects{$config})) {
553 $process_selects{$config} = 1;
554 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400555 }
Steven Rostedtdcc60242009-04-29 22:52:21 -0400556 }
557}
558
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400559sub loop_select {
560
561 foreach my $config (keys %process_selects) {
562 $config =~ s/^CONFIG_//;
563
Steven Rostedt45033792012-06-18 22:41:15 -0400564 dprint "Process select $config\n";
565
Steven Rostedtd4bb58b2012-06-18 22:22:33 -0400566 # config has no prompt and must be selected.
567 parse_config_selects $config, $selects{$config};
568 }
569}
570
571while ($repeat) {
572 # Get the first set of configs and their dependencies.
573 loop_depend;
574
575 $repeat = 0;
576
577 # Now we need to see if we have to check selects;
578 loop_select;
579}
580
Steven Rostedtdcc60242009-04-29 22:52:21 -0400581my %setconfigs;
582
583# Finally, read the .config file and turn off any module enabled that
584# we could not find a reason to keep enabled.
Steven Rostedt4f4c51c2012-06-18 21:43:53 -0400585foreach my $line (@config_file) {
586 $_ = $line;
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400587
588 if (/CONFIG_IKCONFIG/) {
589 if (/# CONFIG_IKCONFIG is not set/) {
590 # enable IKCONFIG at least as a module
591 print "CONFIG_IKCONFIG=m\n";
592 # don't ask about PROC
Steven Rostedtd08ca272009-04-30 19:24:00 -0400593 print "# CONFIG_IKCONFIG_PROC is not set\n";
Steven Rostedtdcc60242009-04-29 22:52:21 -0400594 } else {
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400595 print;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400596 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400597 next;
598 }
599
600 if (/^(CONFIG.*)=(m|y)/) {
601 if (defined($configs{$1})) {
Arnaud Lacombe22d550a2011-07-20 00:40:09 -0400602 if ($localyesconfig) {
603 $setconfigs{$1} = 'y';
Yuta Ando4eae5182012-10-01 23:24:30 +0900604 print "$1=y\n";
605 next;
Arnaud Lacombe22d550a2011-07-20 00:40:09 -0400606 } else {
607 $setconfigs{$1} = $2;
608 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400609 } elsif ($2 eq "m") {
610 print "# $1 is not set\n";
Steven Rostedtd08ca272009-04-30 19:24:00 -0400611 next;
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400612 }
Steven Rostedt744ffcb2009-04-30 12:15:10 -0400613 }
Steven Rostedtd08ca272009-04-30 19:24:00 -0400614 print;
Steven Rostedtdcc60242009-04-29 22:52:21 -0400615}
Steven Rostedtdcc60242009-04-29 22:52:21 -0400616
617# Integrity check, make sure all modules that we want enabled do
618# indeed have their configs set.
619loop:
620foreach my $module (keys(%modules)) {
621 if (defined($objects{$module})) {
622 my @arr = @{$objects{$module}};
623 foreach my $conf (@arr) {
624 if (defined($setconfigs{$conf})) {
625 next loop;
626 }
627 }
628 print STDERR "module $module did not have configs";
629 foreach my $conf (@arr) {
630 print STDERR " " , $conf;
631 }
632 print STDERR "\n";
633 }
634}