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