Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig:
  kconfig: add missing dependency of conf to localyesconfig
  kconfig: test if a .config already exists
  kconfig: make local .config default for streamline_config
  kconfig: test for /boot/config-uname after /proc/config.gz in localconfig
  kconfig: unset IKCONFIG_PROC and clean up nesting
  kconfig: search for a config to base the local(mod|yes)config on
  kconfig: keep config.gz around even if CONFIG_IKCONFIG_PROC is not set
  kconfig: have extract-ikconfig read ELF files
  kconfig: add check if end exists in extract-ikconfig
  kconfig: enable CONFIG_IKCONFIG from streamline_config.pl
  kconfig: do not warn about modules built in
  kconfig: streamline_config.pl do not stop with no depends
  kconfig: add make localyesconfig option
  kconfig: make localmodconfig to run streamline_config.pl
  kconfig: add streamline_config.pl to scripts

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";
+    }
+}