structuredExtraConfig path

    linuxPackages_4_4 = super.linuxPackages_4_4.extend (lib.const (ksuper: {
      kernel = ksuper.kernel.override {
        defconfig = ./kernel.config;
        structuredExtraConfig = with import (pkgs.path + "/lib/kernel.nix") {
          inherit lib;
          version = null;
        }; {                                                                                                                      #CONFIG_INITRAMFS_SOURCE = "${self.initrd}/initrd";
        };
      };
      extraConfig = ''
        CONFIG_INITRAMFS_SOURCE "${self.initrd}/initrd";
      '';
    }));