From 6615efd7a2a2ae24dd55d8d2851757be64e43ac5 Mon Sep 17 00:00:00 2001
From: Eric Naim <dnaim@cachyos.org>
Date: Tue, 1 Oct 2024 08:55:33 +0800
Subject: [PATCH] linux-cachyos: Default to ThinLTO

Signed-off-by: Eric Naim <dnaim@cachyos.org>
---
 linux-cachyos/.SRCINFO | 10 +++++++++-
 linux-cachyos/PKGBUILD | 44 ++++++++++++++++++++++++++++++++++++++----
 script-v3-v4.sh        |  4 +++-
 3 files changed, 52 insertions(+), 6 deletions(-)

diff --git a/linux-cachyos/.SRCINFO b/linux-cachyos/.SRCINFO
index fec04e32..bde7ee82 100644
--- a/linux-cachyos/.SRCINFO
+++ b/linux-cachyos/.SRCINFO
@@ -1,7 +1,7 @@
 pkgbase = linux-cachyos
 	pkgdesc = Linux SCHED-EXT + BORE + Cachy Sauce Kernel by CachyOS with other patches and improvements
 	pkgver = 6.11.1
-	pkgrel = 1
+	pkgrel = 2
 	url = https://github.com/CachyOS/linux-cachyos
 	arch = x86_64
 	license = GPL-2.0-only
@@ -15,6 +15,9 @@ pkgbase = linux-cachyos
 	makedepends = tar
 	makedepends = xz
 	makedepends = zstd
+	makedepends = clang
+	makedepends = llvm
+	makedepends = lld
 	options = !strip
 	options = !debug
 	options = !lto
@@ -22,6 +25,7 @@ pkgbase = linux-cachyos
 	source = config
 	source = auto-cpu-optimization.sh
 	source = https://raw.githubusercontent.com/cachyos/kernel-patches/master/6.11/all/0001-cachyos-base-all.patch
+	source = https://raw.githubusercontent.com/cachyos/kernel-patches/master/6.11/misc/dkms-clang.patch
 	source = https://raw.githubusercontent.com/cachyos/kernel-patches/master/6.11/sched/0001-sched-ext.patch
 	source = https://raw.githubusercontent.com/cachyos/kernel-patches/master/6.11/sched/0001-bore-cachy-ext.patch
 	b2sums = ac9927d74542a2d244b9d683920363ec2dbbe851ae0e069b278f1a0ba82c58b00f0f0312104b46f1b8c06585c2e6acb7eb1e63bd28499891f629c00f9a32f6b5
@@ -45,8 +49,12 @@ pkgname = linux-cachyos
 	provides = WIREGUARD-MODULE
 	provides = KSMBD-MODULE
 	provides = UKSMD-BUILTIN
+	provides = linux-cachyos-lto=6.11.1-2
+	replaces = linux-cachyos-lto=6.11.1-2
 
 pkgname = linux-cachyos-headers
 	pkgdesc = Headers and scripts for building modules for the Linux SCHED-EXT + BORE + Cachy Sauce Kernel by CachyOS with other patches and improvements kernel
 	depends = pahole
 	depends = linux-cachyos
+	provides = linux-cachyos-lto-headers=6.11.1-2
+	replaces = linux-cachyos-lto-headers=6.11.1-2
diff --git a/linux-cachyos/PKGBUILD b/linux-cachyos/PKGBUILD
index a44406cf..d1c00e1b 100644
--- a/linux-cachyos/PKGBUILD
+++ b/linux-cachyos/PKGBUILD
@@ -109,7 +109,7 @@ _use_auto_optimization=${_use_auto_optimization-y}
 # "full: uses 1 thread for Linking, slow and uses more memory, theoretically with the highest performance gains."
 # "thin: uses multiple threads, faster and uses less memory, may have a lower runtime performance than Full."
 # "none: disable LTO
-_use_llvm_lto=${_use_llvm_lto-none}
+_use_llvm_lto=${_use_llvm_lto-thin}
 
 # Use suffix -lto only when requested by the user
 # Enabled by default.
@@ -143,11 +143,11 @@ _build_nvidia_open=${_build_nvidia_open-}
 _build_debug=${_build_debug-}
 
 if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] && [ "$_use_lto_suffix" = "y"  ]; then
-    _pkgsuffix=cachyos-lto
+    _pkgsuffix=cachyos
     pkgbase="linux-$_pkgsuffix"
 
 elif [ -n "$_use_llvm_lto" ]  ||  [[ "$_use_lto_suffix" = "n" ]]; then
-    _pkgsuffix=cachyos
+    _pkgsuffix=cachyos-gcc
     pkgbase="linux-$_pkgsuffix"
 fi
 _major=6.11
@@ -161,7 +161,7 @@ _stable=${_major}.${_minor}
 _srcname=linux-${_stable}
 #_srcname=linux-${_major}
 pkgdesc='Linux SCHED-EXT + BORE + Cachy Sauce Kernel by CachyOS with other patches and improvements'
-pkgrel=1
+pkgrel=2
 _kernver="$pkgver-$pkgrel"
 _kernuname="${pkgver}-${_pkgsuffix}"
 arch=('x86_64')
@@ -595,6 +595,12 @@ _package() {
                 'uksmd: Userspace KSM helper daemon')
     provides=(VIRTUALBOX-GUEST-MODULES WIREGUARD-MODULE KSMBD-MODULE UKSMD-BUILTIN)
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+        provides+=(linux-cachyos-lto=$_kernver)
+        replaces=(linux-cachyos-lto=$_kernver)
+    fi
+
     cd "$_srcname"
 
     local modulesdir="$pkgdir/usr/lib/modules/$(<version)"
@@ -619,6 +625,12 @@ _package-headers() {
     pkgdesc="Headers and scripts for building modules for the $pkgdesc kernel"
     depends=('pahole' "${pkgbase}")
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+        provides+=(linux-cachyos-lto-headers=$_kernver)
+        replaces=(linux-cachyos-lto-headers=$_kernver)
+    fi
+
     cd "${_srcname}"
     local builddir="$pkgdir/usr/lib/modules/$(<version)/build"
 
@@ -704,6 +716,12 @@ _package-dbg(){
     pkgdesc="Non-stripped vmlinux file for the $pkgdesc kernel"
     depends=("${pkgbase}-headers")
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+        provides+=(linux-cachyos-lto-dbg=$_kernver)
+        replaces=(linux-cachyos-lto-dbg=$_kernver)
+    fi
+
     cd "${_srcname}"
     mkdir -p "$pkgdir/usr/src/debug/${pkgbase}"
     install -Dt "$pkgdir/usr/src/debug/${pkgbase}" -m644 vmlinux
@@ -715,6 +733,12 @@ _package-zfs(){
     provides=('ZFS-MODULE')
     license=('CDDL')
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+    provides+=(linux-cachyos-lto-zfs=$_kernver)
+    replaces=(linux-cachyos-lto-zfs=$_kernver)
+    fi
+
     cd "$_srcname"
     local modulesdir="$pkgdir/usr/lib/modules/$(<version)"
 
@@ -732,6 +756,12 @@ _package-nvidia(){
     conflicts=("$pkgbase-nvidia-open")
     license=('custom')
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+        provides+=(linux-cachyos-lto-nvidia=$_kernver)
+        replaces=(linux-cachyos-lto-nvidia=$_kernver)
+    fi
+
     cd "$_srcname"
     local modulesdir="$pkgdir/usr/lib/modules/$(<version)"
 
@@ -749,6 +779,12 @@ _package-nvidia-open(){
     conflicts=("$pkgbase-nvidia")
     license=('MIT AND GPL-2.0-only')
 
+    # Replace LTO kernel with the default kernel
+    if [[ "$_use_llvm_lto" = "thin" || "$_use_llvm_lto" = "full" ]] || [ -n "$_use_kcfi" ]; then
+        provides+=(linux-cachyos-lto-nvidia-open=$_kernver)
+        replaces=(linux-cachyos-lto-nvidia-open=$_kernver)
+    fi
+
     cd "$_srcname"
     local modulesdir="$pkgdir/usr/lib/modules/$(<version)"
 
diff --git a/script-v3-v4.sh b/script-v3-v4.sh
index 90cb9ebd..d2b13558 100755
--- a/script-v3-v4.sh
+++ b/script-v3-v4.sh
@@ -2,12 +2,14 @@
 find . -name "PKGBUILD" | xargs -I {} sed -i "s/_use_auto_optimization-y/_use_auto_optimization-/" {}
 ## Enable ZFS
 find . -name "PKGBUILD" | xargs -I {} sed -i "s/_build_zfs-/_build_zfs-y/" {}
-## Enable Generic v3 
+## Enable Generic v3
 find . -name "PKGBUILD" | xargs -I {} sed -i "s/_processor_opt-/_processor_opt-GENERIC_V3/" {}
 ## Enable NVIDIA module
 find . -name "PKGBUILD" | xargs -I {} sed -i "s/_build_nvidia-/_build_nvidia-y/" {}
 ## Enable Open NVIDIA module
 find . -name "PKGBUILD" | xargs -I {} sed -i "s/_build_nvidia_open-/_build_nvidia_open-y/" {}
+## Disable clang-LTO
+find . -name "PKGBUILD" | xargs -I {} sed -i "s/_use_llvm_lto-thin/_use_llvm_lto-none/" {}
 
 ## GCC v3 Kernel