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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 | # | |
45 | my $config = ".config"; | |
46 | my $linuxpath = "."; | |
47 | ||
48 | open(CIN,$config) || die "Can't open current config file: $config"; | |
49 | my @makefiles = `find $linuxpath -name Makefile`; | |
50 | my %depends; | |
51 | my %selects; | |
52 | my %prompts; | |
53 | my %objects; | |
54 | my $var; | |
55 | my $cont = 0; | |
56 | ||
57 | # Get the top level Kconfig file (passed in) | |
58 | my $kconfig = $ARGV[0]; | |
59 | ||
60 | # prevent recursion | |
61 | my %read_kconfigs; | |
62 | ||
63 | sub read_kconfig { | |
64 | my ($kconfig) = @_; | |
65 | ||
66 | my $state = "NONE"; | |
67 | my $config; | |
68 | my @kconfigs; | |
69 | ||
70 | open(KIN, $kconfig) || die "Can't open $kconfig"; | |
71 | while (<KIN>) { | |
72 | chomp; | |
73 | ||
74 | # collect any Kconfig sources | |
75 | if (/^source\s*"(.*)"/) { | |
76 | $kconfigs[$#kconfigs+1] = $1; | |
77 | } | |
78 | ||
79 | # configs found | |
80 | if (/^\s*config\s+(\S+)\s*$/) { | |
81 | $state = "NEW"; | |
82 | $config = $1; | |
83 | ||
84 | # collect the depends for the config | |
85 | } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) { | |
86 | $state = "DEP"; | |
87 | $depends{$config} = $1; | |
88 | } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) { | |
89 | $depends{$config} .= " " . $1; | |
90 | ||
91 | # Get the configs that select this config | |
92 | } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) { | |
93 | if (defined($selects{$1})) { | |
94 | $selects{$1} .= " " . $config; | |
95 | } else { | |
96 | $selects{$1} = $config; | |
97 | } | |
98 | ||
99 | # configs without prompts must be selected | |
100 | } elsif ($state ne "NONE" && /^\s*tristate\s\S/) { | |
101 | # note if the config has a prompt | |
102 | $prompt{$config} = 1; | |
103 | ||
104 | # stop on "help" | |
105 | } elsif (/^\s*help\s*$/) { | |
106 | $state = "NONE"; | |
107 | } | |
108 | } | |
109 | close(KIN); | |
110 | ||
111 | # read in any configs that were found. | |
112 | foreach $kconfig (@kconfigs) { | |
113 | if (!defined($read_kconfigs{$kconfig})) { | |
114 | $read_kconfigs{$kconfig} = 1; | |
115 | read_kconfig($kconfig); | |
116 | } | |
117 | } | |
118 | } | |
119 | ||
120 | if ($kconfig) { | |
121 | read_kconfig($kconfig); | |
122 | } | |
123 | ||
124 | # Read all Makefiles to map the configs to the objects | |
125 | foreach my $makefile (@makefiles) { | |
126 | chomp $makefile; | |
127 | ||
128 | open(MIN,$makefile) || die "Can't open $makefile"; | |
129 | while (<MIN>) { | |
130 | my $objs; | |
131 | ||
132 | # is this a line after a line with a backslash? | |
133 | if ($cont && /(\S.*)$/) { | |
134 | $objs = $1; | |
135 | } | |
136 | $cont = 0; | |
137 | ||
138 | # collect objects after obj-$(CONFIG_FOO_BAR) | |
139 | if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) { | |
140 | $var = $1; | |
141 | $objs = $2; | |
142 | } | |
143 | if (defined($objs)) { | |
144 | # test if the line ends with a backslash | |
145 | if ($objs =~ m,(.*)\\$,) { | |
146 | $objs = $1; | |
147 | $cont = 1; | |
148 | } | |
149 | ||
150 | foreach my $obj (split /\s+/,$objs) { | |
151 | $obj =~ s/-/_/g; | |
152 | if ($obj =~ /(.*)\.o$/) { | |
153 | # Objects may bes enabled by more than one config. | |
154 | # Store configs in an array. | |
155 | my @arr; | |
156 | ||
157 | if (defined($objects{$1})) { | |
158 | @arr = @{$objects{$1}}; | |
159 | } | |
160 | ||
161 | $arr[$#arr+1] = $var; | |
162 | ||
163 | # The objects have a hash mapping to a reference | |
164 | # of an array of configs. | |
165 | $objects{$1} = \@arr; | |
166 | } | |
167 | } | |
168 | } | |
169 | } | |
170 | close(MIN); | |
171 | } | |
172 | ||
173 | my %modules; | |
174 | ||
175 | # see what modules are loaded on this system | |
176 | open(LIN,"/sbin/lsmod|") || die "Cant lsmod"; | |
177 | while (<LIN>) { | |
178 | next if (/^Module/); # Skip the first line. | |
179 | if (/^(\S+)/) { | |
180 | $modules{$1} = 1; | |
181 | } | |
182 | } | |
183 | close (LIN); | |
184 | ||
185 | # add to the configs hash all configs that are needed to enable | |
186 | # a loaded module. | |
187 | my %configs; | |
188 | foreach my $module (keys(%modules)) { | |
189 | if (defined($objects{$module})) { | |
190 | @arr = @{$objects{$module}}; | |
191 | foreach my $conf (@arr) { | |
192 | $configs{$conf} = $module; | |
193 | } | |
194 | } else { | |
195 | # Most likely, someone has a custom (binary?) module loaded. | |
196 | print STDERR "$module config not found!!\n"; | |
197 | } | |
198 | } | |
199 | ||
200 | my $valid = "A-Za-z_0-9"; | |
201 | my $repeat = 1; | |
202 | ||
203 | # | |
204 | # Note, we do not care about operands (like: &&, ||, !) we want to add any | |
205 | # config that is in the depend list of another config. This script does | |
206 | # not enable configs that are not already enabled. If we come across a | |
207 | # config A that depends on !B, we can still add B to the list of depends | |
208 | # to keep on. If A was on in the original config, B would not have been | |
209 | # and B would not be turned on by this script. | |
210 | # | |
211 | sub parse_config_dep_select | |
212 | { | |
213 | my ($p) = @_; | |
214 | ||
215 | while ($p =~ /[$valid]/) { | |
216 | ||
217 | if ($p =~ /^[^$valid]*([$valid]+)/) { | |
218 | my $conf = "CONFIG_" . $1; | |
219 | ||
220 | $p =~ s/^[^$valid]*[$valid]+//; | |
221 | ||
222 | if (!defined($configs{$conf})) { | |
223 | # We must make sure that this config has its | |
224 | # dependencies met. | |
225 | $repeat = 1; # do again | |
226 | $configs{$conf} = 1; | |
227 | } | |
228 | } else { | |
229 | die "this should never happen"; | |
230 | } | |
231 | } | |
232 | } | |
233 | ||
234 | while ($repeat) { | |
235 | $repeat = 0; | |
236 | ||
237 | foreach my $config (keys %configs) { | |
238 | $config =~ s/^CONFIG_//; | |
239 | ||
74398d32 SR |
240 | if (defined($depends{$config})) { |
241 | # This config has dependencies. Make sure they are also included | |
242 | parse_config_dep_select $depends{$config}; | |
dcc60243 SR |
243 | } |
244 | ||
dcc60243 SR |
245 | if (defined($prompt{$config}) || !defined($selects{$config})) { |
246 | next; | |
247 | } | |
248 | ||
249 | # config has no prompt and must be selected. | |
250 | parse_config_dep_select $selects{$config}; | |
251 | } | |
252 | } | |
253 | ||
254 | my %setconfigs; | |
255 | ||
256 | # Finally, read the .config file and turn off any module enabled that | |
257 | # we could not find a reason to keep enabled. | |
258 | while(<CIN>) { | |
259 | if (/^(CONFIG.*)=m/) { | |
260 | if (defined($configs{$1})) { | |
261 | $setconfigs{$1} = 1; | |
262 | print; | |
263 | } else { | |
264 | print "# $1 is not set\n"; | |
265 | } | |
266 | } else { | |
267 | print; | |
268 | } | |
269 | } | |
270 | close(CIN); | |
271 | ||
272 | # Integrity check, make sure all modules that we want enabled do | |
273 | # indeed have their configs set. | |
274 | loop: | |
275 | foreach my $module (keys(%modules)) { | |
276 | if (defined($objects{$module})) { | |
277 | my @arr = @{$objects{$module}}; | |
278 | foreach my $conf (@arr) { | |
279 | if (defined($setconfigs{$conf})) { | |
280 | next loop; | |
281 | } | |
282 | } | |
283 | print STDERR "module $module did not have configs"; | |
284 | foreach my $conf (@arr) { | |
285 | print STDERR " " , $conf; | |
286 | } | |
287 | print STDERR "\n"; | |
288 | } | |
289 | } |