Added something like linux_2_6_23. Really -rc8. Rationale:

1. Not to forget all the systemKernel choices.
2. To learn new problems, so that adding actual 2.6.23 will be easily done.

svn path=/nixpkgs/trunk/; revision=9381

pkgs/os-specific/linux/kernel/linux-2.6.23.nix

@@ -0,0 +1,76 @@
+{ stdenv, fetchurl, perl, mktemp, module_init_tools
+
+  # A list of patches to apply to the kernel.  Each element of this list
+  # should be an attribute set {name, patch} where `name' is a
+  # symbolic name and `patch' is the actual patch.  The patch may
+  # optionally be compressed with gzip or bzip2.
+, kernelPatches ? []
+
+, # Whether to build a User-Mode Linux kernel.
+  userModeLinux ? false
+
+, # Allows you to set your own kernel version suffix (e.g.,
+  # "-my-kernel").
+  localVersion ? ""
+
+, # Your own kernel configuration file, if you don't want to use the
+  # default. 
+  kernelConfig ? null  
+}:
+
+assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux";
+
+let
+
+  lib = import ../../../lib;
+
+  version = "2.6.22.9";
+
+in
+
+stdenv.mkDerivation {
+  name = if userModeLinux then "user-mode-linux-${version}" else "linux-${version}";
+  builder = ./builder.sh;
+  
+  src = fetchurl {
+    url = "mirror://kernel/linux/kernel/v2.6/linux-${version}.tar.bz2";
+    sha256 = "19rspc22ld2xxdgik10c876m1lbxhcb1k3f31fg404dp21nxvkhq";
+  };
+  
+  patches = map (p: p.patch) kernelPatches;
+  extraConfig = lib.concatStrings (map (p: "\n" + (if p ? extraConfig then p.extraConfig else "") + "\n") kernelPatches);
+
+  config =
+    if kernelConfig != null then kernelConfig else
+    if userModeLinux then ./config-2.6.22-uml else
+    if stdenv.system == "i686-linux" then ./config-2.6.22-i686-smp else
+    if stdenv.system == "x86_64-linux" then ./config-2.6.22-x86_64-smp else
+    abort "No kernel configuration for your platform!";
+  
+  buildInputs = [perl mktemp];
+  
+  arch =
+    if userModeLinux then "um" else
+    if stdenv.system == "i686-linux" then "i386" else
+    if stdenv.system == "x86_64-linux" then "x86_64" else
+    abort "Platform ${stdenv.system} is not supported.";
+
+  makeFlags = if userModeLinux then "ARCH=um SHELL=bash" else "";
+
+  inherit module_init_tools;
+
+  allowLocalVersion = false; # don't allow patches to set a suffix
+  inherit localVersion; # but do allow the user to set one.
+
+  meta = {
+    description =
+      (if userModeLinux then
+        "User-Mode Linux"
+       else
+        "The Linux kernel") +
+      (if kernelPatches == [] then "" else
+        " (with patches: "
+        + lib.concatStrings (lib.intersperse ", " (map (x: x.name) kernelPatches))
+        + ")");
+  };
+}

pkgs/top-level/all-packages.nix

@@ -2672,7 +2672,8 @@ rec {
   kernel = kernel_2_6_21;
 
   systemKernel = (if (getConfig ["kernel" "version"] "2.6.21") == "2.6.22" then
-	kernel_2_6_22 else kernel);
+	kernel_2_6_22 else if (getConfig ["kernel" "version"] "2.6.21") == "2.6.23" then
+	kernel_2_6_23 else kernel);
 
   kernel_2_6_20 = import ../os-specific/linux/kernel/linux-2.6.20.nix {
     inherit fetchurl stdenv perl mktemp module_init_tools;
@@ -2815,6 +2816,91 @@ rec {
 	;
   };
 
+  kernel_2_6_23 = import ../os-specific/linux/kernel/linux-2.6.23.nix {
+    inherit fetchurl stdenv perl mktemp module_init_tools;
+    kernelPatches = [
+      /*{ name = "ext3cow";
+        patch = ../os-specific/linux/kernel/linux-2.6.20.3-ext3cow.patch;
+        extraConfig =
+        "CONFIG_EXT3COW_FS=m\n" +
+        "CONFIG_EXT3COW_FS_XATTR=y\n" +
+        "CONFIG_EXT3COW_FS_POSIX_ACL=y\n" +
+        "CONFIG_EXT3COW_FS_SECURITY=y\n";
+      }*/
+      { name = "paravirt-nvidia";
+        patch = ../os-specific/linux/kernel/2.6.22-paravirt-nvidia.patch;
+      }
+      /*
+      { name = "skas-2.6.20-v9-pre9";
+        patch = fetchurl {
+          url = http://www.user-mode-linux.org/~blaisorblade/patches/skas3-2.6/skas-2.6.20-v9-pre9/skas-2.6.20-v9-pre9.patch.bz2;
+          md5 = "02e619e5b3aaf0f9768f03ac42753e74";
+        };
+        extraConfig =
+          "CONFIG_PROC_MM=y\n" +
+          "# CONFIG_PROC_MM_DUMPABLE is not set\n";
+      }
+      */
+      { name = "fbsplash-0.9.2-r5-2.6.21";
+        patch = fetchurl {
+          url = http://dev.gentoo.org/~dsd/genpatches/trunk/2.6.22/4200_fbsplash-0.9.2-r5.patch;
+          sha256 = "0822wwlf2dqsap5qslnnp0yl1nbvvvb76l73w2dd8zsyn0bqg3px";
+        };
+        extraConfig = "CONFIG_FB_SPLASH=y";
+      }
+    ]++
+	(if (getConfig ["kernel" "no_hz"] false) then [
+	{
+		name = "Enable-NO_HZ";
+		patch = ../lib/empty.file;
+		extraConfig = "CONFIG_NO_HZ=y\n";
+	}
+	] else [])
+	++
+	(if (getConfig ["kernel" "timer_stats"] false) then [
+	{
+		name = "Enable-TIMER_STATS";
+		patch = ../lib/empty.file;
+		extraConfig = "CONFIG_TIMER_STATS=y\n";
+	}
+	] else [])
+	++
+	(if (getConfig ["kernel" "usb_suspend"] false) then [
+	{
+		name = "Enable-USB_SUSPEND";
+		patch = ../lib/empty.file;
+		extraConfig = "CONFIG_USB_SUSPEND=y\n";
+	}
+	] else [])
+	++
+	(if (getConfig ["kernel" "no_irqbalance"] false) then [
+	{
+		name = "Disable-IRQBALANCE";
+		patch = ../lib/empty.file;
+		extraConfig = "# CONFIG_IRQBALANCE is not set\n";
+	}
+	] else [])
+	++
+	[{
+
+		name = "External-config";
+		patch = ../lib/empty.file;
+		extraConfig =( getConfig ["kernel" "addConfig"] "");
+	}]
+	++
+	[{
+		name = "patch-2.6.23-rc8";
+		patch = fetchurl {
+			url = http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.23-rc8.bz2;
+			sha256 = "1007y8z9zs32fcm1m9ic8dp01jfj7550pr0l2sbhxlwr7v6cy554";
+		};			
+	}
+	]
+
+	;
+  };
+
+
   libselinux = import ../os-specific/linux/libselinux {
     inherit fetchurl stdenv libsepol;
   };