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";
+    }
+}