Anonymous user
Linux kernel: Difference between revisions
Add instructions for patching In-tree kernel modules without rebuilding the entire kernel
imported>Khoi |
imported>Lelgenio (Add instructions for patching In-tree kernel modules without rebuilding the entire kernel) |
||
| Line 451: | Line 451: | ||
</syntaxHighlight> | </syntaxHighlight> | ||
== Patching a single In-tree kernel module == | |||
If you wish to patch a single kernel module, you can avoid rebuilding the entire linux kernel | |||
by packaging that module applying patches to it. | |||
=== Packaging a single kernel module === | |||
Here is an example for how to package the <code>amdgpu</code> kernel module. | |||
<syntaxHighlight lang=nix> | |||
{ pkgs | |||
, lib | |||
, kernel ? pkgs.linuxPackages_latest.kernel | |||
}: | |||
pkgs.stdenv.mkDerivation { | |||
pname = "amdgpu-kernel-module"; | |||
inherit (kernel) src version postPatch nativeBuildInputs; | |||
kernel_dev = kernel.dev; | |||
kernelVersion = kernel.modDirVersion; | |||
modulePath = "drivers/gpu/drm/amd/amdgpu"; | |||
buildPhase = '' | |||
BUILT_KERNEL=$kernel_dev/lib/modules/$kernelVersion/build | |||
cp $BUILT_KERNEL/Module.symvers . | |||
cp $BUILT_KERNEL/.config . | |||
cp $kernel_dev/vmlinux . | |||
make "-j$NIX_BUILD_CORES" modules_prepare | |||
make "-j$NIX_BUILD_CORES" M=$modulePath modules | |||
''; | |||
installPhase = '' | |||
make \ | |||
INSTALL_MOD_PATH="$out" \ | |||
XZ="xz -T$NIX_BUILD_CORES" \ | |||
M="$modulePath" \ | |||
modules_install | |||
''; | |||
meta = { | |||
description = "AMD GPU kernel module"; | |||
license = lib.licenses.gpl3; | |||
}; | |||
} | |||
</syntaxHighlight> | |||
=== Replacing default kernel modules === | |||
After packaging the kernel module you can add it to your system just like an out-of-tree kernel module, it will replace the default module provided by the linux package because it has the same name: | |||
<syntaxHighlight lang=nix> | |||
{pkgs, config, ...}: | |||
let | |||
amdgpu-kernel-module = pkgs.callPackage ./amdgpu-kernel-module.nix { | |||
# Make sure the module targets the same kernel as your system is using. | |||
kernel = config.boot.kernelPackages.kernel; | |||
}; | |||
in | |||
{ | |||
boot.extraModulePackages = [ | |||
(amdgpu-kernel-module.overrideAttrs (_: { | |||
patches = [ ./patches/amdgpu-foo-bar.patch ]; | |||
}) | |||
]; | |||
} | |||
</syntaxHighlight> | |||
== Troubleshooting == | == Troubleshooting == | ||