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dcc60243 SR |
1 | #!/usr/bin/perl -w |
2 | # | |
cce1dac8 | 3 | # Copyright 2005-2009 - Steven Rostedt |
dcc60243 SR |
4 | # 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 | # | |
cf5a189d | 45 | use strict; |
46 | ||
dcc60243 | 47 | my $config = ".config"; |
dcc60243 | 48 | |
cdfc4795 SR |
49 | my $uname = `uname -r`; |
50 | chomp $uname; | |
51 | ||
52 | my @searchconfigs = ( | |
a9024838 SR |
53 | { |
54 | "file" => ".config", | |
55 | "exec" => "cat", | |
56 | }, | |
cdfc4795 SR |
57 | { |
58 | "file" => "/proc/config.gz", | |
59 | "exec" => "zcat", | |
60 | }, | |
810b2be6 SR |
61 | { |
62 | "file" => "/boot/config-$uname", | |
63 | "exec" => "cat", | |
64 | }, | |
cdfc4795 SR |
65 | { |
66 | "file" => "/boot/vmlinuz-$uname", | |
67 | "exec" => "scripts/extract-ikconfig", | |
68 | "test" => "scripts/extract-ikconfig", | |
69 | }, | |
70 | { | |
71 | "file" => "vmlinux", | |
72 | "exec" => "scripts/extract-ikconfig", | |
73 | "test" => "scripts/extract-ikconfig", | |
74 | }, | |
75 | { | |
76 | "file" => "/lib/modules/$uname/kernel/kernel/configs.ko", | |
77 | "exec" => "scripts/extract-ikconfig", | |
78 | "test" => "scripts/extract-ikconfig", | |
79 | }, | |
80 | { | |
81 | "file" => "kernel/configs.ko", | |
82 | "exec" => "scripts/extract-ikconfig", | |
83 | "test" => "scripts/extract-ikconfig", | |
84 | }, | |
85 | { | |
86 | "file" => "kernel/configs.o", | |
87 | "exec" => "scripts/extract-ikconfig", | |
88 | "test" => "scripts/extract-ikconfig", | |
89 | }, | |
cdfc4795 SR |
90 | ); |
91 | ||
92 | sub find_config { | |
93 | foreach my $conf (@searchconfigs) { | |
94 | my $file = $conf->{"file"}; | |
95 | ||
96 | next if ( ! -f "$file"); | |
97 | ||
98 | if (defined($conf->{"test"})) { | |
99 | `$conf->{"test"} $conf->{"file"} 2>/dev/null`; | |
100 | next if ($?); | |
101 | } | |
102 | ||
103 | my $exec = $conf->{"exec"}; | |
104 | ||
105 | print STDERR "using config: '$file'\n"; | |
106 | ||
107 | open(CIN, "$exec $file |") || die "Failed to run $exec $file"; | |
108 | return; | |
109 | } | |
110 | die "No config file found"; | |
111 | } | |
112 | ||
113 | find_config; | |
114 | ||
463bf900 SR |
115 | # Get the build source and top level Kconfig file (passed in) |
116 | my $ksource = $ARGV[0]; | |
117 | my $kconfig = $ARGV[1]; | |
615f0833 | 118 | my $lsmod_file = $ARGV[2]; |
463bf900 | 119 | |
17431928 TF |
120 | my @makefiles = `find $ksource -name Makefile 2>/dev/null`; |
121 | chomp @makefiles; | |
122 | ||
dcc60243 SR |
123 | my %depends; |
124 | my %selects; | |
125 | my %prompts; | |
126 | my %objects; | |
127 | my $var; | |
13d7e938 SR |
128 | my $iflevel = 0; |
129 | my @ifdeps; | |
dcc60243 | 130 | |
dcc60243 SR |
131 | # prevent recursion |
132 | my %read_kconfigs; | |
133 | ||
134 | sub read_kconfig { | |
135 | my ($kconfig) = @_; | |
136 | ||
137 | my $state = "NONE"; | |
138 | my $config; | |
139 | my @kconfigs; | |
140 | ||
20d19047 SR |
141 | my $cont = 0; |
142 | my $line; | |
143 | ||
4908980b SR |
144 | my $source = "$ksource/$kconfig"; |
145 | my $last_source = ""; | |
146 | ||
147 | # Check for any environment variables used | |
148 | while ($source =~ /\$(\w+)/ && $last_source ne $source) { | |
149 | my $env = $1; | |
150 | $last_source = $source; | |
151 | $source =~ s/\$$env/$ENV{$env}/; | |
152 | } | |
153 | ||
154 | open(KIN, "$source") || die "Can't open $kconfig"; | |
dcc60243 SR |
155 | while (<KIN>) { |
156 | chomp; | |
157 | ||
20d19047 SR |
158 | # Make sure that lines ending with \ continue |
159 | if ($cont) { | |
160 | $_ = $line . " " . $_; | |
161 | } | |
162 | ||
163 | if (s/\\$//) { | |
164 | $cont = 1; | |
165 | $line = $_; | |
166 | next; | |
167 | } | |
168 | ||
169 | $cont = 0; | |
170 | ||
dcc60243 SR |
171 | # collect any Kconfig sources |
172 | if (/^source\s*"(.*)"/) { | |
173 | $kconfigs[$#kconfigs+1] = $1; | |
174 | } | |
175 | ||
176 | # configs found | |
8ef17fa2 | 177 | if (/^\s*(menu)?config\s+(\S+)\s*$/) { |
dcc60243 | 178 | $state = "NEW"; |
8ef17fa2 | 179 | $config = $2; |
dcc60243 | 180 | |
13d7e938 SR |
181 | for (my $i = 0; $i < $iflevel; $i++) { |
182 | if ($i) { | |
183 | $depends{$config} .= " " . $ifdeps[$i]; | |
184 | } else { | |
185 | $depends{$config} = $ifdeps[$i]; | |
186 | } | |
187 | $state = "DEP"; | |
188 | } | |
189 | ||
dcc60243 SR |
190 | # collect the depends for the config |
191 | } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) { | |
192 | $state = "DEP"; | |
193 | $depends{$config} = $1; | |
194 | } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) { | |
195 | $depends{$config} .= " " . $1; | |
196 | ||
197 | # Get the configs that select this config | |
198 | } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) { | |
199 | if (defined($selects{$1})) { | |
200 | $selects{$1} .= " " . $config; | |
201 | } else { | |
202 | $selects{$1} = $config; | |
203 | } | |
204 | ||
205 | # configs without prompts must be selected | |
206 | } elsif ($state ne "NONE" && /^\s*tristate\s\S/) { | |
207 | # note if the config has a prompt | |
ccece60a | 208 | $prompts{$config} = 1; |
dcc60243 | 209 | |
13d7e938 SR |
210 | # Check for if statements |
211 | } elsif (/^if\s+(.*\S)\s*$/) { | |
212 | my $deps = $1; | |
213 | # remove beginning and ending non text | |
214 | $deps =~ s/^[^a-zA-Z0-9_]*//; | |
215 | $deps =~ s/[^a-zA-Z0-9_]*$//; | |
216 | ||
217 | my @deps = split /[^a-zA-Z0-9_]+/, $deps; | |
218 | ||
219 | $ifdeps[$iflevel++] = join ':', @deps; | |
220 | ||
221 | } elsif (/^endif/) { | |
222 | ||
223 | $iflevel-- if ($iflevel); | |
224 | ||
dcc60243 SR |
225 | # stop on "help" |
226 | } elsif (/^\s*help\s*$/) { | |
227 | $state = "NONE"; | |
228 | } | |
229 | } | |
230 | close(KIN); | |
231 | ||
232 | # read in any configs that were found. | |
233 | foreach $kconfig (@kconfigs) { | |
234 | if (!defined($read_kconfigs{$kconfig})) { | |
235 | $read_kconfigs{$kconfig} = 1; | |
236 | read_kconfig($kconfig); | |
237 | } | |
238 | } | |
239 | } | |
240 | ||
241 | if ($kconfig) { | |
242 | read_kconfig($kconfig); | |
243 | } | |
244 | ||
245 | # Read all Makefiles to map the configs to the objects | |
246 | foreach my $makefile (@makefiles) { | |
dcc60243 | 247 | |
20d19047 SR |
248 | my $cont = 0; |
249 | ||
dcc60243 SR |
250 | open(MIN,$makefile) || die "Can't open $makefile"; |
251 | while (<MIN>) { | |
252 | my $objs; | |
253 | ||
254 | # is this a line after a line with a backslash? | |
255 | if ($cont && /(\S.*)$/) { | |
256 | $objs = $1; | |
257 | } | |
258 | $cont = 0; | |
259 | ||
260 | # collect objects after obj-$(CONFIG_FOO_BAR) | |
261 | if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) { | |
262 | $var = $1; | |
263 | $objs = $2; | |
264 | } | |
265 | if (defined($objs)) { | |
266 | # test if the line ends with a backslash | |
267 | if ($objs =~ m,(.*)\\$,) { | |
268 | $objs = $1; | |
269 | $cont = 1; | |
270 | } | |
271 | ||
272 | foreach my $obj (split /\s+/,$objs) { | |
273 | $obj =~ s/-/_/g; | |
274 | if ($obj =~ /(.*)\.o$/) { | |
1d1d1fea | 275 | # Objects may be enabled by more than one config. |
dcc60243 SR |
276 | # Store configs in an array. |
277 | my @arr; | |
278 | ||
279 | if (defined($objects{$1})) { | |
280 | @arr = @{$objects{$1}}; | |
281 | } | |
282 | ||
283 | $arr[$#arr+1] = $var; | |
284 | ||
285 | # The objects have a hash mapping to a reference | |
286 | # of an array of configs. | |
287 | $objects{$1} = \@arr; | |
288 | } | |
289 | } | |
290 | } | |
291 | } | |
292 | close(MIN); | |
293 | } | |
294 | ||
295 | my %modules; | |
296 | ||
615f0833 SR |
297 | if (defined($lsmod_file)) { |
298 | if ( ! -f $lsmod_file) { | |
299 | die "$lsmod_file not found"; | |
300 | } | |
301 | if ( -x $lsmod_file) { | |
302 | # the file is executable, run it | |
303 | open(LIN, "$lsmod_file|"); | |
304 | } else { | |
305 | # Just read the contents | |
306 | open(LIN, "$lsmod_file"); | |
88f66ea9 | 307 | } |
615f0833 SR |
308 | } else { |
309 | ||
310 | # see what modules are loaded on this system | |
311 | my $lsmod; | |
312 | ||
cf5a189d | 313 | foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) { |
615f0833 SR |
314 | if ( -x "$dir/lsmod" ) { |
315 | $lsmod = "$dir/lsmod"; | |
316 | last; | |
317 | } | |
88f66ea9 | 318 | } |
615f0833 SR |
319 | if (!defined($lsmod)) { |
320 | # try just the path | |
321 | $lsmod = "lsmod"; | |
322 | } | |
323 | ||
324 | open(LIN,"$lsmod|") || die "Can not call lsmod with $lsmod"; | |
88f66ea9 SR |
325 | } |
326 | ||
dcc60243 SR |
327 | while (<LIN>) { |
328 | next if (/^Module/); # Skip the first line. | |
329 | if (/^(\S+)/) { | |
330 | $modules{$1} = 1; | |
331 | } | |
332 | } | |
333 | close (LIN); | |
334 | ||
335 | # add to the configs hash all configs that are needed to enable | |
336 | # a loaded module. | |
337 | my %configs; | |
338 | foreach my $module (keys(%modules)) { | |
339 | if (defined($objects{$module})) { | |
e5199edb | 340 | my @arr = @{$objects{$module}}; |
dcc60243 SR |
341 | foreach my $conf (@arr) { |
342 | $configs{$conf} = $module; | |
343 | } | |
344 | } else { | |
345 | # Most likely, someone has a custom (binary?) module loaded. | |
346 | print STDERR "$module config not found!!\n"; | |
347 | } | |
348 | } | |
349 | ||
350 | my $valid = "A-Za-z_0-9"; | |
351 | my $repeat = 1; | |
352 | ||
353 | # | |
354 | # Note, we do not care about operands (like: &&, ||, !) we want to add any | |
355 | # config that is in the depend list of another config. This script does | |
356 | # not enable configs that are not already enabled. If we come across a | |
357 | # config A that depends on !B, we can still add B to the list of depends | |
358 | # to keep on. If A was on in the original config, B would not have been | |
359 | # and B would not be turned on by this script. | |
360 | # | |
361 | sub parse_config_dep_select | |
362 | { | |
363 | my ($p) = @_; | |
364 | ||
365 | while ($p =~ /[$valid]/) { | |
366 | ||
367 | if ($p =~ /^[^$valid]*([$valid]+)/) { | |
368 | my $conf = "CONFIG_" . $1; | |
369 | ||
370 | $p =~ s/^[^$valid]*[$valid]+//; | |
371 | ||
372 | if (!defined($configs{$conf})) { | |
373 | # We must make sure that this config has its | |
374 | # dependencies met. | |
375 | $repeat = 1; # do again | |
376 | $configs{$conf} = 1; | |
377 | } | |
378 | } else { | |
379 | die "this should never happen"; | |
380 | } | |
381 | } | |
382 | } | |
383 | ||
384 | while ($repeat) { | |
385 | $repeat = 0; | |
386 | ||
387 | foreach my $config (keys %configs) { | |
388 | $config =~ s/^CONFIG_//; | |
389 | ||
74398d32 SR |
390 | if (defined($depends{$config})) { |
391 | # This config has dependencies. Make sure they are also included | |
392 | parse_config_dep_select $depends{$config}; | |
dcc60243 SR |
393 | } |
394 | ||
ccece60a | 395 | if (defined($prompts{$config}) || !defined($selects{$config})) { |
dcc60243 SR |
396 | next; |
397 | } | |
398 | ||
399 | # config has no prompt and must be selected. | |
400 | parse_config_dep_select $selects{$config}; | |
401 | } | |
402 | } | |
403 | ||
404 | my %setconfigs; | |
405 | ||
406 | # Finally, read the .config file and turn off any module enabled that | |
407 | # we could not find a reason to keep enabled. | |
408 | while(<CIN>) { | |
744ffcbe SR |
409 | |
410 | if (/CONFIG_IKCONFIG/) { | |
411 | if (/# CONFIG_IKCONFIG is not set/) { | |
412 | # enable IKCONFIG at least as a module | |
413 | print "CONFIG_IKCONFIG=m\n"; | |
414 | # don't ask about PROC | |
d08ca277 | 415 | print "# CONFIG_IKCONFIG_PROC is not set\n"; |
744ffcbe SR |
416 | } else { |
417 | print; | |
418 | } | |
419 | next; | |
420 | } | |
421 | ||
422 | if (/^(CONFIG.*)=(m|y)/) { | |
423 | if (defined($configs{$1})) { | |
424 | $setconfigs{$1} = $2; | |
744ffcbe SR |
425 | } elsif ($2 eq "m") { |
426 | print "# $1 is not set\n"; | |
d08ca277 | 427 | next; |
dcc60243 | 428 | } |
744ffcbe | 429 | } |
d08ca277 | 430 | print; |
dcc60243 SR |
431 | } |
432 | close(CIN); | |
433 | ||
434 | # Integrity check, make sure all modules that we want enabled do | |
435 | # indeed have their configs set. | |
436 | loop: | |
437 | foreach my $module (keys(%modules)) { | |
438 | if (defined($objects{$module})) { | |
439 | my @arr = @{$objects{$module}}; | |
440 | foreach my $conf (@arr) { | |
441 | if (defined($setconfigs{$conf})) { | |
442 | next loop; | |
443 | } | |
444 | } | |
445 | print STDERR "module $module did not have configs"; | |
446 | foreach my $conf (@arr) { | |
447 | print STDERR " " , $conf; | |
448 | } | |
449 | print STDERR "\n"; | |
450 | } | |
451 | } |