Linux kernel: Difference between revisions

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 [nix-shell] $ make menuconfig
 </syntaxHighlight> (thanks to sphalerite)
+== Adding <code>extraConfig</code> ==
+It is sometimes desirable to change the configuration of your kernel, while keeping the kernel version itself managed through nixpkgs. To do so, you can add the configuration to a dummy {{nixos:option|boot.kernelPatches}}<ref>[https://logs.nix.samueldr.com/nixos/2018-05-09#1525898458-1525898534; #nixos 2018-05-09]</ref><ref>[https://github.com/NixOS/nixpkgs/blob/03d4694e6110fa9c16e88ee74085ea2068c27494/nixos/modules/misc/crashdump.nix#L63-L73 <tt>nixos/modules/misc/crashdump.nix#L63-L73</tt>]</ref>, which will then be merged and applied to the current kernel. As with kernel configuration with NixOS, drop the <tt>CONFIG_</tt> from the kernel configuration names.
+This example is from the {{nixos:option|boot.crashDump.enable}} option:
+<syntaxhighlight lang=nix>
+{
+      boot.kernelPatches = [ {
+        name = "crashdump-config";
+        patch = null;
+        extraConfig = ''
+                CRASH_DUMP y
+                DEBUG_INFO y
+                PROC_VMCORE y
+                LOCKUP_DETECTOR y
+                HARDLOCKUP_DETECTOR y
+              '';
+        } ];
+}
+</syntaxhighlight>