From 3286b7ecf1d864e2be050af78aa633d4e3ae8fdb Mon Sep 17 00:00:00 2001
From: Lan Tian <xuyh0120@outlook.com>
Date: Tue, 17 Mar 2026 20:36:35 -0700
Subject: [PATCH] Properly enable PREEMPT_RT for rt-bore variant by setting
 correct CPU scheduler

---
 README.md                        | 2 +-
 kernel-cachyos/default.nix       | 4 ++--
 kernel-cachyos/mkCachyKernel.nix | 2 ++
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index d1a4c8a..0dd0f5b 100644
--- a/README.md
+++ b/README.md
@@ -297,7 +297,7 @@ The following arguments can be passed to `mkCachyKernel`:
 
 **CachyOS Fine Tuning Settings:**
 
-- **`cpusched`**: CPU scheduler. Options: `"eevdf"` (default), `"bore"`, `"bmq"`, `"hardened"`, `"rt"`, `"rt-bore"` or `null` to disable.
+- **`cpusched`**: CPU scheduler. Options: `"eevdf"` (default), `"bore"`, `"bmq"`, `"rt"`, `"rt-bore"` or `null` to disable.
 - **`kcfi`**: Enable Kernel Control Flow Integrity. Default: `false`.
 - **`hzTicks`**: Timer frequency. Options: `"1000"` (default), `"250"`, `"300"`, `"500"`, `"750"`, or `null` to disable.
 - **`performanceGovernor`**: Enable performance governor. Default: `false`.
diff --git a/kernel-cachyos/default.nix b/kernel-cachyos/default.nix
index 810bffa..9fbeaa1 100644
--- a/kernel-cachyos/default.nix
+++ b/kernel-cachyos/default.nix
@@ -231,14 +231,14 @@ builtins.listToAttrs (
       inherit (linuxSources.latest) version src;
       configVariant = "linux-cachyos-rt-bore";
       rt = true;
-      cpusched = "bore";
+      cpusched = "rt-bore";
     })
     (mkCachyKernel {
       pname = "linux-cachyos-rt-bore-lto";
       inherit (linuxSources.latest) version src;
       configVariant = "linux-cachyos-rt-bore";
       rt = true;
-      cpusched = "bore";
+      cpusched = "rt-bore";
       lto = "thin";
     })
     (mkCachyKernel {
diff --git a/kernel-cachyos/mkCachyKernel.nix b/kernel-cachyos/mkCachyKernel.nix
index cf2b6a9..4760cc9 100644
--- a/kernel-cachyos/mkCachyKernel.nix
+++ b/kernel-cachyos/mkCachyKernel.nix
@@ -70,6 +70,8 @@ lib.makeOverridable (
 
   # AutoFDO requires Clang compiler
   assert autofdo != false -> lto != "none";
+  # rt/rt-bore cpusched requires realtime patchset
+  assert cpusched == "rt" || cpusched == "rt-bore" -> rt;
 
   let
     helpers = callPackage ../helpers.nix { };