From 15c6ede14492eae311a00dd0919e828518bedbde Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 14 Dec 2009 09:27:15 +0000
Subject: [PATCH] * Allow options to be ignored if they don't exist by marking
 them with   a "?".

svn path=/nixpkgs/branches/kernel-config/; revision=18931
---
 pkgs/os-specific/linux/kernel/builder.sh         |  4 ++--
 pkgs/os-specific/linux/kernel/generate-config.pl | 15 ++++++++++-----
 pkgs/os-specific/linux/kernel/linux-2.6.29.nix   |  8 +++-----
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/builder.sh b/pkgs/os-specific/linux/kernel/builder.sh
index 59def5799b4b..58d257438100 100644
--- a/pkgs/os-specific/linux/kernel/builder.sh
+++ b/pkgs/os-specific/linux/kernel/builder.sh
@@ -21,8 +21,8 @@ configurePhase() {
     fi
 
 
-    # Patch kconfig to print "###" after every question -
-    # generate-config.pl expects this.
+    # Patch kconfig to print "###" after every question so that
+    # generate-config.pl can answer them.
     sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
 
     # Create the config file.
diff --git a/pkgs/os-specific/linux/kernel/generate-config.pl b/pkgs/os-specific/linux/kernel/generate-config.pl
index 2acba32e8d77..56320ce882fa 100644
--- a/pkgs/os-specific/linux/kernel/generate-config.pl
+++ b/pkgs/os-specific/linux/kernel/generate-config.pl
@@ -18,12 +18,17 @@ $SIG{PIPE} = 'IGNORE';
 
 # Read the answers.
 my %answers;
+my %requiredAnswers;
 open ANSWERS, "<$ENV{KERNEL_CONFIG}" or die;
 while (<ANSWERS>) {
     chomp;
     s/#.*//;
-    my ($name, $value) = split / /;
-    $answers{$name} = $value if $name;
+    if (/^\s*([A-Za-z0-9_]+)(\?)?\s+(\S+)\s*$/) {
+        $answers{$1} = $3;
+        $requiredAnswers{$1} = 1 unless defined $2;
+    } elsif (!/^\s*$/) {
+        die "invalid config line: $_";
+    }
 }
 close ANSWERS;
 
@@ -123,8 +128,8 @@ while (<CONFIG>) {
 close CONFIG;
 
 foreach my $name (sort (keys %answers)) {
-    die "unused option: $name\n"
-        unless defined $config{$name};
-    die "option not set correctly: $name\n"
+    my $f = $requiredAnswers{$name} ? sub { die @_; } : sub { warn @_; };
+    &$f("unused option: $name\n") unless defined $config{$name};
+    &$f("option not set correctly: $name\n")
         if $config{$name} && $config{$name} ne $answers{$name};
 }
diff --git a/pkgs/os-specific/linux/kernel/linux-2.6.29.nix b/pkgs/os-specific/linux/kernel/linux-2.6.29.nix
index 120fd182f202..9a7fb3a34711 100644
--- a/pkgs/os-specific/linux/kernel/linux-2.6.29.nix
+++ b/pkgs/os-specific/linux/kernel/linux-2.6.29.nix
@@ -47,7 +47,7 @@ import ./generic.nix (
         # Disable some expensive (?) features.
         MARKERS n
         KPROBES n
-        NUMA n
+        NUMA? n
         PM_TRACE_RTC n
 
         # Enable various subsystems.
@@ -78,9 +78,7 @@ import ./generic.nix (
         # Wireless networking.
         IPW2100_MONITOR y # support promiscuous mode
         IPW2200_MONITOR y # support promiscuous mode
-        ${stdenv.lib.optionalString (!userModeLinux) ''
-          IWLWIFI_LEDS y
-        ''}
+        IWLWIFI_LEDS? y
         IWLWIFI_RFKILL y
         IWLAGN_SPECTRUM_MEASUREMENT y
         IWLAGN_LEDS y
@@ -192,7 +190,7 @@ import ./generic.nix (
         BT_RFCOMM_TTY y # RFCOMM TTY support
         CPU_FREQ_DEBUG n
         CRASH_DUMP n
-        DMAR n # experimental
+        DMAR? n # experimental
         DVB_DYNAMIC_MINORS y # we use udev
         FUSION y # Fusion MPT device support
         IDE_GD_ATAPI y # ATAPI floppy support