diff options
| -rw-r--r-- | kernel/Makefile | 2 | ||||
| -rwxr-xr-x | scripts/extract-ikconfig | 14 | ||||
| -rw-r--r-- | scripts/kconfig/Makefile | 34 | ||||
| -rw-r--r-- | scripts/kconfig/streamline_config.pl | 366 |
4 files changed, 414 insertions, 2 deletions
diff --git a/kernel/Makefile b/kernel/Makefile index b833bd5cc127..961379caf666 100644 --- a/kernel/Makefile +++ b/kernel/Makefile @@ -117,7 +117,7 @@ $(obj)/config_data.gz: .config FORCE $(call if_changed,gzip) quiet_cmd_ikconfiggz = IKCFG $@ - cmd_ikconfiggz = (echo "static const char kernel_config_data[] = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@ + cmd_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@ targets += config_data.h $(obj)/config_data.h: $(obj)/config_data.gz FORCE $(call if_changed,ikconfiggz) diff --git a/scripts/extract-ikconfig b/scripts/extract-ikconfig index 72997c353cb3..de233ff43c1c 100755 --- a/scripts/extract-ikconfig +++ b/scripts/extract-ikconfig @@ -17,6 +17,10 @@ dump_config() { return fi end=`$binoffset $file $IKCFG_ED 2>/dev/null` + [ "$?" != "0" ] && end="-1" + if [ "$end" -eq "-1" ]; then + return + fi start=`expr $start + 8` size=`expr $end - $start` @@ -55,6 +59,8 @@ dump_config "$image" GZHDR1="0x1f 0x8b 0x08 0x00" GZHDR2="0x1f 0x8b 0x08 0x08" +ELFHDR="0x7f 0x45 0x4c 0x46" + # vmlinux.gz: Check for a compressed images off=`$binoffset "$image" $GZHDR1 2>/dev/null` [ "$?" != "0" ] && off="-1" @@ -69,6 +75,14 @@ elif [ "$off" -ne "-1" ]; then (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \ zcat >"$TMPFILE" dump_config "$TMPFILE" + +# check if this is simply an ELF file +else + off=`$binoffset "$image" $ELFHDR 2>/dev/null` + [ "$?" != "0" ] && off="-1" + if [ "$off" -eq "0" ]; then + dump_config "$image" + fi fi echo "ERROR: Unable to extract kernel configuration information." diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile index 5ddf8becd7a2..6d69c7ccdcc7 100644 --- a/scripts/kconfig/Makefile +++ b/scripts/kconfig/Makefile @@ -2,7 +2,8 @@ # Kernel configuration targets # These targets are used from top-level makefile -PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config +PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config \ + localmodconfig localyesconfig ifdef KBUILD_KCONFIG Kconfig := $(KBUILD_KCONFIG) @@ -28,6 +29,35 @@ oldconfig: $(obj)/conf silentoldconfig: $(obj)/conf $< -s $(Kconfig) +localmodconfig: $(obj)/streamline_config.pl $(obj)/conf + $(Q)perl $< $(Kconfig) > .tmp.config + $(Q)if [ -f .config ]; then \ + cmp -s .tmp.config .config || \ + (mv -f .config .config.old.1; \ + mv -f .tmp.config .config; \ + $(obj)/conf -s $(Kconfig); \ + mv -f .config.old.1 .config.old) \ + else \ + mv -f .tmp.config .config; \ + $(obj)/conf -s $(Kconfig); \ + fi + $(Q)rm -f .tmp.config + +localyesconfig: $(obj)/streamline_config.pl $(obj)/conf + $(Q)perl $< $(Kconfig) > .tmp.config + $(Q)sed -i s/=m/=y/ .tmp.config + $(Q)if [ -f .config ]; then \ + cmp -s .tmp.config .config || \ + (mv -f .config .config.old.1; \ + mv -f .tmp.config .config; \ + $(obj)/conf -s $(Kconfig); \ + mv -f .config.old.1 .config.old) \ + else \ + mv -f .tmp.config .config; \ + $(obj)/conf -s $(Kconfig); \ + fi + $(Q)rm -f .tmp.config + # Create new linux.pot file # Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files # The symlink is used to repair a deficiency in arch/um @@ -83,6 +113,8 @@ help: @echo ' xconfig - Update current config utilising a QT based front-end' @echo ' gconfig - Update current config utilising a GTK based front-end' @echo ' oldconfig - Update current config utilising a provided .config as base' + @echo ' localmodconfig - Update current config disabling modules not loaded' + @echo ' localyesconfig - Update current config converting local mods to core' @echo ' silentoldconfig - Same as oldconfig, but quietly, additionally update deps' @echo ' randconfig - New config with random answer to all options' @echo ' defconfig - New config with default answer to all options' diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl new file mode 100644 index 000000000000..95984db8e1e0 --- /dev/null +++ b/scripts/kconfig/streamline_config.pl @@ -0,0 +1,366 @@ +#!/usr/bin/perl -w +# +# Copywrite 2005-2009 - Steven Rostedt +# Licensed under the terms of the GNU GPL License version 2 +# +# It's simple enough to figure out how this works. +# If not, then you can ask me at stripconfig@goodmis.org +# +# What it does? +# +# If you have installed a Linux kernel from a distribution +# that turns on way too many modules than you need, and +# you only want the modules you use, then this program +# is perfect for you. +# +# It gives you the ability to turn off all the modules that are +# not loaded on your system. +# +# Howto: +# +# 1. Boot up the kernel that you want to stream line the config on. +# 2. Change directory to the directory holding the source of the +# kernel that you just booted. +# 3. Copy the configuraton file to this directory as .config +# 4. Have all your devices that you need modules for connected and +# operational (make sure that their corresponding modules are loaded) +# 5. Run this script redirecting the output to some other file +# like config_strip. +# 6. Back up your old config (if you want too). +# 7. copy the config_strip file to .config +# 8. Run "make oldconfig" +# +# Now your kernel is ready to be built with only the modules that +# are loaded. +# +# Here's what I did with my Debian distribution. +# +# cd /usr/src/linux-2.6.10 +# cp /boot/config-2.6.10-1-686-smp .config +# ~/bin/streamline_config > config_strip +# mv .config config_sav +# mv config_strip .config +# make oldconfig +# +my $config = ".config"; +my $linuxpath = "."; + +my $uname = `uname -r`; +chomp $uname; + +my @searchconfigs = ( + { + "file" => ".config", + "exec" => "cat", + }, + { + "file" => "/proc/config.gz", + "exec" => "zcat", + }, + { + "file" => "/boot/config-$uname", + "exec" => "cat", + }, + { + "file" => "/boot/vmlinuz-$uname", + "exec" => "scripts/extract-ikconfig", + "test" => "scripts/extract-ikconfig", + }, + { + "file" => "vmlinux", + "exec" => "scripts/extract-ikconfig", + "test" => "scripts/extract-ikconfig", + }, + { + "file" => "/lib/modules/$uname/kernel/kernel/configs.ko", + "exec" => "scripts/extract-ikconfig", + "test" => "scripts/extract-ikconfig", + }, + { + "file" => "kernel/configs.ko", + "exec" => "scripts/extract-ikconfig", + "test" => "scripts/extract-ikconfig", + }, + { + "file" => "kernel/configs.o", + "exec" => "scripts/extract-ikconfig", + "test" => "scripts/extract-ikconfig", + }, +); + +sub find_config { + foreach my $conf (@searchconfigs) { + my $file = $conf->{"file"}; + + next if ( ! -f "$file"); + + if (defined($conf->{"test"})) { + `$conf->{"test"} $conf->{"file"} 2>/dev/null`; + next if ($?); + } + + my $exec = $conf->{"exec"}; + + print STDERR "using config: '$file'\n"; + + open(CIN, "$exec $file |") || die "Failed to run $exec $file"; + return; + } + die "No config file found"; +} + +find_config; + +my @makefiles = `find $linuxpath -name Makefile`; +my %depends; +my %selects; +my %prompts; +my %objects; +my $var; +my $cont = 0; + +# Get the top level Kconfig file (passed in) +my $kconfig = $ARGV[0]; + +# prevent recursion +my %read_kconfigs; + +sub read_kconfig { + my ($kconfig) = @_; + + my $state = "NONE"; + my $config; + my @kconfigs; + + open(KIN, $kconfig) || die "Can't open $kconfig"; + while (<KIN>) { + chomp; + + # collect any Kconfig sources + if (/^source\s*"(.*)"/) { + $kconfigs[$#kconfigs+1] = $1; + } + + # configs found + if (/^\s*config\s+(\S+)\s*$/) { + $state = "NEW"; + $config = $1; + + # collect the depends for the config + } elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) { + $state = "DEP"; + $depends{$config} = $1; + } elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) { + $depends{$config} .= " " . $1; + + # Get the configs that select this config + } elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) { + if (defined($selects{$1})) { + $selects{$1} .= " " . $config; + } else { + $selects{$1} = $config; + } + + # configs without prompts must be selected + } elsif ($state ne "NONE" && /^\s*tristate\s\S/) { + # note if the config has a prompt + $prompt{$config} = 1; + + # stop on "help" + } elsif (/^\s*help\s*$/) { + $state = "NONE"; + } + } + close(KIN); + + # read in any configs that were found. + foreach $kconfig (@kconfigs) { + if (!defined($read_kconfigs{$kconfig})) { + $read_kconfigs{$kconfig} = 1; + read_kconfig($kconfig); + } + } +} + +if ($kconfig) { + read_kconfig($kconfig); +} + +# Read all Makefiles to map the configs to the objects +foreach my $makefile (@makefiles) { + chomp $makefile; + + open(MIN,$makefile) || die "Can't open $makefile"; + while (<MIN>) { + my $objs; + + # is this a line after a line with a backslash? + if ($cont && /(\S.*)$/) { + $objs = $1; + } + $cont = 0; + + # collect objects after obj-$(CONFIG_FOO_BAR) + if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) { + $var = $1; + $objs = $2; + } + if (defined($objs)) { + # test if the line ends with a backslash + if ($objs =~ m,(.*)\\$,) { + $objs = $1; + $cont = 1; + } + + foreach my $obj (split /\s+/,$objs) { + $obj =~ s/-/_/g; + if ($obj =~ /(.*)\.o$/) { + # Objects may bes enabled by more than one config. + # Store configs in an array. + my @arr; + + if (defined($objects{$1})) { + @arr = @{$objects{$1}}; + } + + $arr[$#arr+1] = $var; + + # The objects have a hash mapping to a reference + # of an array of configs. + $objects{$1} = \@arr; + } + } + } + } + close(MIN); +} + +my %modules; + +# see what modules are loaded on this system +open(LIN,"/sbin/lsmod|") || die "Cant lsmod"; +while (<LIN>) { + next if (/^Module/); # Skip the first line. + if (/^(\S+)/) { + $modules{$1} = 1; + } +} +close (LIN); + +# add to the configs hash all configs that are needed to enable +# a loaded module. +my %configs; +foreach my $module (keys(%modules)) { + if (defined($objects{$module})) { + @arr = @{$objects{$module}}; + foreach my $conf (@arr) { + $configs{$conf} = $module; + } + } else { + # Most likely, someone has a custom (binary?) module loaded. + print STDERR "$module config not found!!\n"; + } +} + +my $valid = "A-Za-z_0-9"; +my $repeat = 1; + +# +# Note, we do not care about operands (like: &&, ||, !) we want to add any +# config that is in the depend list of another config. This script does +# not enable configs that are not already enabled. If we come across a +# config A that depends on !B, we can still add B to the list of depends +# to keep on. If A was on in the original config, B would not have been +# and B would not be turned on by this script. +# +sub parse_config_dep_select +{ + my ($p) = @_; + + while ($p =~ /[$valid]/) { + + if ($p =~ /^[^$valid]*([$valid]+)/) { + my $conf = "CONFIG_" . $1; + + $p =~ s/^[^$valid]*[$valid]+//; + + if (!defined($configs{$conf})) { + # We must make sure that this config has its + # dependencies met. + $repeat = 1; # do again + $configs{$conf} = 1; + } + } else { + die "this should never happen"; + } + } +} + +while ($repeat) { + $repeat = 0; + + foreach my $config (keys %configs) { + $config =~ s/^CONFIG_//; + + if (defined($depends{$config})) { + # This config has dependencies. Make sure they are also included + parse_config_dep_select $depends{$config}; + } + + if (defined($prompt{$config}) || !defined($selects{$config})) { + next; + } + + # config has no prompt and must be selected. + parse_config_dep_select $selects{$config}; + } +} + +my %setconfigs; + +# Finally, read the .config file and turn off any module enabled that +# we could not find a reason to keep enabled. +while(<CIN>) { + + if (/CONFIG_IKCONFIG/) { + if (/# CONFIG_IKCONFIG is not set/) { + # enable IKCONFIG at least as a module + print "CONFIG_IKCONFIG=m\n"; + # don't ask about PROC + print "# CONFIG_IKCONFIG_PROC is not set\n"; + } else { + print; + } + next; + } + + if (/^(CONFIG.*)=(m|y)/) { + if (defined($configs{$1})) { + $setconfigs{$1} = $2; + } elsif ($2 eq "m") { + print "# $1 is not set\n"; + next; + } + } + print; +} +close(CIN); + +# Integrity check, make sure all modules that we want enabled do +# indeed have their configs set. +loop: +foreach my $module (keys(%modules)) { + if (defined($objects{$module})) { + my @arr = @{$objects{$module}}; + foreach my $conf (@arr) { + if (defined($setconfigs{$conf})) { + next loop; + } + } + print STDERR "module $module did not have configs"; + foreach my $conf (@arr) { + print STDERR " " , $conf; + } + print STDERR "\n"; + } +} |