Restore linuxManualConfig as linux/kernel/manual-config.nix

[thefloweringash]

Motivation for this change

In a recent pull request (#34351) the definition of buildLinux changed from linux/kernel/manual-config.nix to linux/kernel/generic.nix. Since linuxManualConfig is an alias of buildLinux, this means that linuxManualConfig now points to linux/kernel/generic.nix.

I haven't examined the details of the work in this area, but it reads like a simple oversight. The documentation also doesn't seem to have a section on how to build a manually configured kernel. Is linuxManualConfig the intended way?

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[cstrahan]

Indeed - otherwise the existing linuxPackages_custom no longer works:

nixpkgs/pkgs/top-level/all-packages.nix

Lines 13292 to 13296 in bd7d5b3

	linuxPackages_custom = { version, src, configfile }:
	recurseIntoAttrs (linuxPackagesFor (pkgs.linuxManualConfig {
	inherit version src configfile stdenv;
	allowImportFromDerivation = true;
	}));

Note that it expects to be able to pass configfile directly, which is only possible with linux/kernel/manual-config.nix.

I'll merge this, as it does appear to be a minor oversight.

[teto]

sorry for the inconvenience. I plan to write some doc once #34672 gets merged. I will mention linuxManualConfig which can be handy.