From 21c7e66112d3ec360a9902037d086fdb15e4ebeb Mon Sep 17 00:00:00 2001
From: Christian Breunig <christian@breunig.cc>
Date: Wed, 8 Jul 2026 20:45:13 +0200
Subject: Kernel: T5641: enable module compression to save disk space

After signing the Linux Kernel modules with the ephemeral key, proceed
by compressing the Kernel modules with xz to reduce the final ISO image
size.

Initial tests have shown a size reduction by 60MiB.
---
 ...-package-signed-compressed-kernel-modules.patch | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 scripts/package-build/linux-kernel/patches/accel-ppp-ng/0001-cmake-package-signed-compressed-kernel-modules.patch

(limited to 'scripts/package-build/linux-kernel/patches')

diff --git a/scripts/package-build/linux-kernel/patches/accel-ppp-ng/0001-cmake-package-signed-compressed-kernel-modules.patch b/scripts/package-build/linux-kernel/patches/accel-ppp-ng/0001-cmake-package-signed-compressed-kernel-modules.patch
new file mode 100644
index 00000000..d69ef038
--- /dev/null
+++ b/scripts/package-build/linux-kernel/patches/accel-ppp-ng/0001-cmake-package-signed-compressed-kernel-modules.patch
@@ -0,0 +1,66 @@
+From: Christian Breunig <christian@vyos.io>
+Date: Sun, 5 Jul 2026 00:00:00 +0200
+Subject: [PATCH] cmake: package signed/compressed kernel modules
+
+sign-modules.sh signs the built ipoe/vlan_mon/pptp kernel modules and,
+if the target kernel's .config enables CONFIG_MODULE_COMPRESS_XZ,
+compresses them to .ko.xz before cpack packages the Debian archive.
+The Debian packaging rules installed the drivers by their exact
+pre-sign build path (*.ko) unconditionally, so a compressed build
+never actually shipped the compressed module. Mirror sign-modules.sh's
+own .config check to pick the extension that actually ends up on disk.
+
+---
+ cmake/debian/debian.cmake | 16 ++++++++++++++--
+ 1 file changed, 14 insertions(+), 2 deletions(-)
+
+diff --git a/cmake/debian/debian.cmake b/cmake/debian/debian.cmake
+index 8db274a..64b8f7d 100644
+--- a/cmake/debian/debian.cmake
++++ b/cmake/debian/debian.cmake
+@@ -9,6 +9,18 @@ if (NOT DEFINED MODULES_KDIR)
+ 	)
+ endif()
+
++# sign-modules.sh signs the built .ko files and, if the target kernel's
++# .config has module compression enabled, xz-compresses them in place.
++# Mirror that check here so we install whichever artifact actually ends
++# up on disk.
++SET(KMOD_EXT ".ko")
++IF (DEFINED KDIR AND EXISTS "${KDIR}/.config")
++	FILE(STRINGS "${KDIR}/.config" _ACCEL_PPP_KMOD_COMPRESS_XZ REGEX "^CONFIG_MODULE_COMPRESS_XZ=y$")
++	IF (_ACCEL_PPP_KMOD_COMPRESS_XZ)
++		SET(KMOD_EXT ".ko.xz")
++	ENDIF ()
++ENDIF ()
++
+ if (BUILD_PPTP_DRIVER)
+ 	if (BUILD_DRIVER_ONLY)
+ 		SET(CPACK_PACKAGE_VERSION_MAJOR "0")
+@@ -21,7 +33,7 @@ if (BUILD_PPTP_DRIVER)
+ 		SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/cmake/debian-kmod/postinst")
+ 	endif ()
+ 	#INSTALL(DIRECTORY lib/modules/${DEBIAN_KDIR}/extra)
+-	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/driver/driver/pptp.ko DESTINATION /lib/modules/${MODULES_KDIR}/extra)
++	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/driver/driver/pptp${KMOD_EXT} DESTINATION /lib/modules/${MODULES_KDIR}/extra)
+ 	#SET(CPACK_DEBIAN_PACKAGE_DEPENDS "linux-image (= ${LINUX_IMAGE})")
+ endif (BUILD_PPTP_DRIVER)
+
+@@ -33,7 +45,7 @@ if (BUILD_IPOE_DRIVER)
+ 		SET(CPACK_DEBIAN_PACKAGE_DEPENDS "")
+ 		SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/cmake/debian-kmod/postinst")
+ 	endif ()
+-	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/drivers/ipoe/driver/ipoe.ko DESTINATION /lib/modules/${MODULES_KDIR}/extra)
++	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/drivers/ipoe/driver/ipoe${KMOD_EXT} DESTINATION /lib/modules/${MODULES_KDIR}/extra)
+ endif (BUILD_IPOE_DRIVER)
+
+ if (BUILD_VLAN_MON_DRIVER)
+@@ -44,7 +56,7 @@ if (BUILD_VLAN_MON_DRIVER)
+ 		SET(CPACK_DEBIAN_PACKAGE_DEPENDS "")
+ 		SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA "${CMAKE_CURRENT_SOURCE_DIR}/cmake/debian-kmod/postinst")
+ 	endif ()
+-	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/drivers/vlan_mon/driver/vlan_mon.ko DESTINATION /lib/modules/${MODULES_KDIR}/extra)
++	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/drivers/vlan_mon/driver/vlan_mon${KMOD_EXT} DESTINATION /lib/modules/${MODULES_KDIR}/extra)
+ endif (BUILD_VLAN_MON_DRIVER)
+
+ if (NOT BUILD_DRIVER_ONLY)
-- 
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