Move kernel config to its own role.

nix/configuration/roles/optimized_build/default.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }:
 
@@ -49,71 +48,13 @@
   };
 
   config = lib.mkMerge [
-    (lib.mkIf (!config.me.optimizations.enable) (
-      lib.mkMerge [
-        {
-          boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_6_18;
-          # boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux;
-        }
-      ]
-    ))
     (lib.mkIf config.me.optimizations.enable (
       lib.mkMerge [
         {
-          boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_me;
-
           nixpkgs.hostPlatform = {
             gcc.arch = config.me.optimizations.arch;
             gcc.tune = config.me.optimizations.arch;
           };
-
-          nixpkgs.overlays = [
-            (
-              final: prev:
-              let
-                addConfig =
-                  additionalConfig: pkg:
-                  pkg.override (oldconfig: {
-                    structuredExtraConfig = pkg.structuredExtraConfig // additionalConfig;
-                  });
-              in
-              {
-                linux_me = addConfig {
-                  # Server | No preemption - Run until the next tick. Highest throughput but can cause stutter.
-                  # PREEMPT = lib.mkOverride 60 lib.kernel.no;
-                  # Desktop | Preempt kernel threads only at pre-defined places that call cond_resched().
-                  PREEMPT_VOLUNTARY = lib.mkOverride 60 lib.kernel.no;
-                  # Low-latency desktop | Full preemption - Kernel threads can be preempted unless they hold a spinlock or are in a no-preemption section.
-                  PREEMPT = lib.mkOverride 60 lib.kernel.yes;
-                  # RT - All kernel code is preemptible except for a few critical sections.
-                  # Middle ground | Real-time tasks preempt immediately like FULL, normal tasks run until the next tick.
-                  PREEMPT_LAZY = lib.mkOverride 90 lib.kernel.no;
-
-                  # Google's BBRv3 TCP congestion Control
-                  TCP_CONG_BBR = lib.kernel.yes;
-                  DEFAULT_BBR = lib.kernel.yes;
-
-                  # Preemptive Full Tickless Kernel at 300Hz
-                  HZ = lib.kernel.freeform "300";
-                  HZ_300 = lib.kernel.yes;
-                  HZ_1000 = lib.kernel.no;
-                } prev.linux_6_18; # or prev.linux
-              }
-            )
-            (final: prev: {
-              inherit (final.unoptimized)
-                assimp
-                binaryen
-                gsl
-                rapidjson
-                ffmpeg-headless
-                ffmpeg
-                pipewire
-                chromaprint
-                gtkmm
-                ;
-            })
-          ];
         }
       ]
     ))