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Diffstat (limited to 'scripts/kconfig/streamline_config.pl')
-rw-r--r-- | scripts/kconfig/streamline_config.pl | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl new file mode 100644 index 000000000000..79d85573ee0f --- /dev/null +++ b/scripts/kconfig/streamline_config.pl | |||
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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 | $config =~ s/^CONFIG_//; | ||
239 | |||
240 | if (!defined($depends{$config})) { | ||
241 | next; | ||
242 | } | ||
243 | |||
244 | # This config has dependencies. Make sure they are also included | ||
245 | parse_config_dep_select $depends{$config}; | ||
246 | |||
247 | if (defined($prompt{$config}) || !defined($selects{$config})) { | ||
248 | next; | ||
249 | } | ||
250 | |||
251 | # config has no prompt and must be selected. | ||
252 | parse_config_dep_select $selects{$config}; | ||
253 | } | ||
254 | } | ||
255 | |||
256 | my %setconfigs; | ||
257 | |||
258 | # Finally, read the .config file and turn off any module enabled that | ||
259 | # we could not find a reason to keep enabled. | ||
260 | while(<CIN>) { | ||
261 | if (/^(CONFIG.*)=m/) { | ||
262 | if (defined($configs{$1})) { | ||
263 | $setconfigs{$1} = 1; | ||
264 | print; | ||
265 | } else { | ||
266 | print "# $1 is not set\n"; | ||
267 | } | ||
268 | } else { | ||
269 | print; | ||
270 | } | ||
271 | } | ||
272 | close(CIN); | ||
273 | |||
274 | # Integrity check, make sure all modules that we want enabled do | ||
275 | # indeed have their configs set. | ||
276 | loop: | ||
277 | foreach my $module (keys(%modules)) { | ||
278 | if (defined($objects{$module})) { | ||
279 | my @arr = @{$objects{$module}}; | ||
280 | foreach my $conf (@arr) { | ||
281 | if (defined($setconfigs{$conf})) { | ||
282 | next loop; | ||
283 | } | ||
284 | } | ||
285 | print STDERR "module $module did not have configs"; | ||
286 | foreach my $conf (@arr) { | ||
287 | print STDERR " " , $conf; | ||
288 | } | ||
289 | print STDERR "\n"; | ||
290 | } | ||
291 | } | ||