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linux: ability to merge structured configs
This should make the composability of kernel configurations more straigthforward. - now distinguish freeform options from tristate ones - will look for a structured config in kernelPatches too one can now access the structuredConfig from a kernel via linux_test.configfile.structuredConfig in order to reinject it into another kernel, no need to rewrite the config from scratch The following merge strategies are used in case of conflict: -- freeform items must be equal or they conflict (mergeEqualOption) -- for tristate (y/m/n) entries, I use the mergeAnswer strategy which takes the best available value, "best" being defined by the user (by default "y" > "m" > "n", e.g. if one entry is both marked "y" and "n", "y" wins) -- if one item is both marked optional/mandatory, mandatory wins (mergeFalseByDefault)
This commit is contained in:
Matthieu Coudron
parent
bf041c3f1d
commit
3bb7b3f02e
@ -32,6 +32,7 @@ let
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modules = callLibs ./modules.nix;
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options = callLibs ./options.nix;
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types = callLibs ./types.nix;
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kernel = callLibs ./kernel.nix;
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# constants
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licenses = callLibs ./licenses.nix;
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@ -1,57 +1,16 @@
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{ lib
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# we pass the kernel version here to keep a nice syntax `whenOlder "4.13"`
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# kernelVersion, e.g., config.boot.kernelPackages.version
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, version
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, mkValuePreprocess ? null
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}:
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{ lib }:
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with lib;
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rec {
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# Common patterns
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when = cond: opt: if cond then opt else null;
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whenAtLeast = ver: when (versionAtLeast version ver);
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whenOlder = ver: when (versionOlder version ver);
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whenBetween = verLow: verHigh: when (versionAtLeast version verLow && versionOlder version verHigh);
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# Keeping these around in case we decide to change this horrible implementation :)
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option = x: if x == null then null else "?${x}";
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yes = "y";
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no = "n";
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module = "m";
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option = x:
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x // { optional = true; };
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mkValue = val:
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let
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isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
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in
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if val == "" then "\"\""
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else if val == yes || val == module || val == no then val
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else if all isNumber (stringToCharacters val) then val
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else if substring 0 2 val == "0x" then val
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else val; # FIXME: fix quoting one day
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yes = { tristate = "y"; };
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no = { tristate = "n"; };
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module = { tristate = "m"; };
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freeform = x: { freeform = x; };
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# generate nix intermediate kernel config file of the form
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#
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# VIRTIO_MMIO m
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# VIRTIO_BLK y
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# VIRTIO_CONSOLE n
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# NET_9P_VIRTIO? y
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#
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# Use mkValuePreprocess to preprocess option values, aka mark 'modules' as
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# 'yes' or vice-versa
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# Borrowed from copumpkin https://github.com/NixOS/nixpkgs/pull/12158
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# returns a string, expr should be an attribute set
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generateNixKConf = exprs: mkValuePreprocess:
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let
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mkConfigLine = key: rawval:
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let
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val = if builtins.isFunction mkValuePreprocess then mkValuePreprocess rawval else rawval;
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in
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if val == null
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then ""
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else if hasPrefix "?" val
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then "${key}? ${mkValue (removePrefix "?" val)}\n"
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else "${key} ${mkValue val}\n";
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mkConf = cfg: concatStrings (mapAttrsToList mkConfigLine cfg);
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in mkConf exprs;
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}
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137
nixos/modules/system/boot/kernel_config.nix
Normal file
137
nixos/modules/system/boot/kernel_config.nix
Normal file
@ -0,0 +1,137 @@
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{ lib, config, ... }:
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with lib;
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let
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findWinner = candidates: winner:
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any (x: x == winner) candidates;
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# winners is an ordered list where first item wins over 2nd etc
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mergeAnswer = winners: locs: defs:
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let
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values = map (x: x.value) defs;
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freeformAnswer = intersectLists values winners;
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inter = intersectLists values winners;
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winner = head winners;
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in
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if defs == [] then abort "This case should never happen."
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else if winner == [] then abort "Give a valid list of winner"
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else if inter == [] then mergeOneOption locs defs
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else if findWinner values winner then
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winner
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else
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mergeAnswer (tail winners) locs defs;
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mergeFalseByDefault = locs: defs:
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if defs == [] then abort "This case should never happen."
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else if any (x: x == false) defs then false
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else true;
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kernelItem = types.submodule {
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options = {
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tristate = mkOption {
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type = types.enum [ "y" "m" "n" null ] // {
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merge = mergeAnswer [ "y" "m" "n" ];
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};
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default = null;
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internal = true;
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visible = true;
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description = ''
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Use this field for tristate kernel options expecting a "y" or "m" or "n".
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'';
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};
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freeform = mkOption {
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type = types.nullOr types.str // {
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merge = mergeEqualOption;
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};
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default = null;
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example = ''MMC_BLOCK_MINORS.freeform = "32";'';
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description = ''
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Freeform description of a kernel configuration item value.
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'';
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};
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optional = mkOption {
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type = types.bool // { merge = mergeFalseByDefault; };
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default = false;
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description = ''
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Wether option should generate a failure when unused.
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'';
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};
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};
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};
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mkValue = with lib; val:
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let
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isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
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in
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if (val == "") then "\"\""
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else if val == "y" || val == "m" || val == "n" then val
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else if all isNumber (stringToCharacters val) then val
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else if substring 0 2 val == "0x" then val
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else val; # FIXME: fix quoting one day
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# generate nix intermediate kernel config file of the form
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#
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# VIRTIO_MMIO m
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# VIRTIO_BLK y
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# VIRTIO_CONSOLE n
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# NET_9P_VIRTIO? y
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#
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# Borrowed from copumpkin https://github.com/NixOS/nixpkgs/pull/12158
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# returns a string, expr should be an attribute set
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# Use mkValuePreprocess to preprocess option values, aka mark 'modules' as 'yes' or vice-versa
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# use the identity if you don't want to override the configured values
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generateNixKConf = exprs:
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let
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mkConfigLine = key: item:
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let
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val = if item.freeform != null then item.freeform else item.tristate;
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in
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if val == null
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then ""
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else if (item.optional)
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then "${key}? ${mkValue val}\n"
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else "${key} ${mkValue val}\n";
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mkConf = cfg: concatStrings (mapAttrsToList mkConfigLine cfg);
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in mkConf exprs;
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in
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{
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options = {
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intermediateNixConfig = mkOption {
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readOnly = true;
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type = types.lines;
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example = ''
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USB? y
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DEBUG n
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'';
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description = ''
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The result of converting the structured kernel configuration in settings
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to an intermediate string that can be parsed by generate-config.pl to
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answer the kernel `make defconfig`.
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'';
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};
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settings = mkOption {
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type = types.attrsOf kernelItem;
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example = literalExample '' with lib.kernel; {
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"9P_NET" = yes;
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USB = optional yes;
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MMC_BLOCK_MINORS = freeform "32";
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}'';
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description = ''
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Structured kernel configuration.
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'';
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};
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};
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config = {
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intermediateNixConfig = generateNixKConf config.settings;
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};
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}
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@ -12,25 +12,19 @@
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# Configuration
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{ stdenv, version
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# to let user override values, aka converting modules to included and vice-versa
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, mkValueOverride ? null
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# new extraConfig as a flattened set
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, structuredExtraConfig ? {}
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# legacy extraConfig as string
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, extraConfig ? ""
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, features ? { grsecurity = false; xen_dom0 = false; }
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}:
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assert (mkValueOverride == null) || (builtins.isFunction mkValueOverride);
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with stdenv.lib;
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with import ../../../../lib/kernel.nix { inherit (stdenv) lib; inherit version; };
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with import ../../../../lib/kernel.nix { inherit (stdenv) lib; };
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let
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# Common patterns/legacy
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when = cond: opt: if cond then opt else null;
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whenAtLeast = ver: mkIf (versionAtLeast version ver);
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whenOlder = ver: mkIf (versionOlder version ver);
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whenBetween = verLow: verHigh: mkIf (versionAtLeast version verLow && versionOlder version verHigh);
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# configuration items have to be part of a subattrs
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flattenKConf = nested: mapAttrs (_: head) (zipAttrs (attrValues nested));
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@ -46,7 +40,7 @@ let
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DEBUG_NX_TEST = whenOlder "4.11" no;
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CPU_NOTIFIER_ERROR_INJECT = whenOlder "4.4" (option no);
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DEBUG_STACK_USAGE = no;
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DEBUG_STACKOVERFLOW = when (!features.grsecurity) no;
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DEBUG_STACKOVERFLOW = mkIf (!features.grsecurity) no;
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RCU_TORTURE_TEST = no;
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SCHEDSTATS = no;
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DETECT_HUNG_TASK = yes;
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@ -114,7 +108,7 @@ let
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IP_DCCP_CCID3 = no; # experimental
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CLS_U32_PERF = yes;
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CLS_U32_MARK = yes;
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BPF_JIT = when (stdenv.hostPlatform.system == "x86_64-linux") yes;
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BPF_JIT = mkIf (stdenv.hostPlatform.system == "x86_64-linux") yes;
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WAN = yes;
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# Required by systemd per-cgroup firewalling
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CGROUP_BPF = option yes;
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@ -184,7 +178,7 @@ let
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FB_VESA = yes;
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FRAMEBUFFER_CONSOLE = yes;
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FRAMEBUFFER_CONSOLE_ROTATION = yes;
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FB_GEODE = when (stdenv.hostPlatform.system == "i686-linux") yes;
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FB_GEODE = mkIf (stdenv.hostPlatform.system == "i686-linux") yes;
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};
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video = {
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@ -239,7 +233,7 @@ let
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};
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usb = {
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USB_DEBUG = option (whenOlder "4.18" no);
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USB_DEBUG = { optional = true; tristate = whenOlder "4.18" "n";};
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USB_EHCI_ROOT_HUB_TT = yes; # Root Hub Transaction Translators
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USB_EHCI_TT_NEWSCHED = yes; # Improved transaction translator scheduling
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};
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@ -250,7 +244,7 @@ let
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FANOTIFY = yes;
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TMPFS = yes;
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TMPFS_POSIX_ACL = yes;
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FS_ENCRYPTION = option (whenAtLeast "4.9" module);
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FS_ENCRYPTION = { optional = true; tristate = whenAtLeast "4.9" "m"; };
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EXT2_FS_XATTR = yes;
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EXT2_FS_POSIX_ACL = yes;
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@ -262,7 +256,7 @@ let
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EXT4_FS_POSIX_ACL = yes;
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EXT4_FS_SECURITY = yes;
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EXT4_ENCRYPTION = option ((if (versionOlder version "4.8") then module else yes));
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EXT4_ENCRYPTION = { optional = true; tristate = if (versionOlder version "4.8") then "m" else "y"; };
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REISERFS_FS_XATTR = option yes;
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REISERFS_FS_POSIX_ACL = option yes;
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@ -324,7 +318,7 @@ let
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# Native Language Support modules, needed by some filesystems
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NLS = yes;
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NLS_DEFAULT = "utf8";
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NLS_DEFAULT = freeform "utf8";
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NLS_UTF8 = module;
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NLS_CODEPAGE_437 = module; # VFAT default for the codepage= mount option
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NLS_ISO8859_1 = module; # VFAT default for the iocharset= mount option
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@ -334,13 +328,13 @@ let
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security = {
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# Detect writes to read-only module pages
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DEBUG_SET_MODULE_RONX = option (whenOlder "4.11" yes);
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DEBUG_SET_MODULE_RONX = { optional = true; tristate = whenOlder "4.11" "y"; };
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RANDOMIZE_BASE = option yes;
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STRICT_DEVMEM = option yes; # Filter access to /dev/mem
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SECURITY_SELINUX_BOOTPARAM_VALUE = "0"; # Disable SELinux by default
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SECURITY_SELINUX_BOOTPARAM_VALUE = freeform "0"; # Disable SELinux by default
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# Prevent processes from ptracing non-children processes
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SECURITY_YAMA = option yes;
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DEVKMEM = when (!features.grsecurity) no; # Disable /dev/kmem
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DEVKMEM = mkIf (!features.grsecurity) no; # Disable /dev/kmem
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USER_NS = yes; # Support for user namespaces
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@ -350,7 +344,7 @@ let
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} // optionalAttrs (!stdenv.hostPlatform.isAarch32) {
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# Detect buffer overflows on the stack
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CC_STACKPROTECTOR_REGULAR = option (whenOlder "4.18" yes);
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CC_STACKPROTECTOR_REGULAR = {optional = true; tristate = whenOlder "4.18" "y";};
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};
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microcode = {
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@ -407,8 +401,8 @@ let
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FTRACE_SYSCALLS = yes;
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SCHED_TRACER = yes;
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STACK_TRACER = yes;
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UPROBE_EVENT = option (whenOlder "4.11" yes);
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UPROBE_EVENTS = option (whenAtLeast "4.11" yes);
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UPROBE_EVENT = { optional = true; tristate = whenOlder "4.11" "y";};
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UPROBE_EVENTS = { optional = true; tristate = whenAtLeast "4.11" "y";};
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BPF_SYSCALL = whenAtLeast "4.4" yes;
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BPF_EVENTS = whenAtLeast "4.4" yes;
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FUNCTION_PROFILER = yes;
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@ -418,13 +412,13 @@ let
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virtualisation = {
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PARAVIRT = option yes;
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HYPERVISOR_GUEST = when (!features.grsecurity) yes;
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HYPERVISOR_GUEST = mkIf (!features.grsecurity) yes;
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PARAVIRT_SPINLOCKS = option yes;
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KVM_APIC_ARCHITECTURE = whenOlder "4.8" yes;
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KVM_ASYNC_PF = yes;
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KVM_COMPAT = option (whenBetween "4.0" "4.12" yes);
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KVM_DEVICE_ASSIGNMENT = option (whenBetween "3.10" "4.12" yes);
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KVM_COMPAT = { optional = true; tristate = whenBetween "4.0" "4.12" "y"; };
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KVM_DEVICE_ASSIGNMENT = { optional = true; tristate = whenBetween "3.10" "4.12" "y"; };
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KVM_GENERIC_DIRTYLOG_READ_PROTECT = whenAtLeast "4.0" yes;
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KVM_GUEST = when (!features.grsecurity) yes;
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KVM_MMIO = yes;
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@ -432,9 +426,9 @@ let
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KSM = yes;
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VIRT_DRIVERS = yes;
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# We nneed 64 GB (PAE) support for Xen guest support
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HIGHMEM64G = option (when (!stdenv.is64bit) yes);
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HIGHMEM64G = { optional = true; tristate = mkIf (!stdenv.is64bit) "y";};
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VFIO_PCI_VGA = when stdenv.is64bit yes;
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VFIO_PCI_VGA = mkIf stdenv.is64bit yes;
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} // optionalAttrs (stdenv.isx86_64 || stdenv.isi686) ({
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XEN = option yes;
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@ -542,8 +536,8 @@ let
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CRYPTO_TEST = option no;
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EFI_TEST = option no;
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GLOB_SELFTEST = option no;
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DRM_DEBUG_MM_SELFTEST = option (whenOlder "4.18" no);
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LNET_SELFTEST = option (whenOlder "4.18" no);
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DRM_DEBUG_MM_SELFTEST = { optional = true; tristate = whenOlder "4.18" "n";};
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LNET_SELFTEST = { optional = true; tristate = whenOlder "4.18" "n";};
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LOCK_TORTURE_TEST = option no;
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MTD_TESTS = option no;
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NOTIFIER_ERROR_INJECTION = option no;
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@ -598,7 +592,7 @@ let
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AIC79XX_DEBUG_ENABLE = no;
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AIC7XXX_DEBUG_ENABLE = no;
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AIC94XX_DEBUG = no;
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B43_PCMCIA = option (whenOlder "4.4" yes);
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B43_PCMCIA = { optional=true; tristate = whenOlder "4.4" "y";};
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BLK_DEV_INTEGRITY = yes;
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@ -651,7 +645,7 @@ let
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# GPIO on Intel Bay Trail, for some Chromebook internal eMMC disks
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PINCTRL_BAYTRAIL = yes;
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# 8 is default. Modern gpt tables on eMMC may go far beyond 8.
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MMC_BLOCK_MINORS = "32";
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MMC_BLOCK_MINORS = freeform "32";
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REGULATOR = yes; # Voltage and Current Regulator Support
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RC_DEVICES = option yes; # Enable IR devices
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@ -698,7 +692,8 @@ let
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# Bump the maximum number of CPUs to support systems like EC2 x1.*
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# instances and Xeon Phi.
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NR_CPUS = "384";
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NR_CPUS = freeform "384";
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};
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};
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in (generateNixKConf ((flattenKConf options) // structuredExtraConfig) mkValueOverride) + extraConfig
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in
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flattenKConf options
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@ -47,7 +47,6 @@
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, preferBuiltin ? stdenv.hostPlatform.platform.kernelPreferBuiltin or false
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, kernelArch ? stdenv.hostPlatform.platform.kernelArch
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, mkValueOverride ? null
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, ...
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}:
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@ -68,20 +67,26 @@ let
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ia32Emulation = true;
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} // features) kernelPatches;
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intermediateNixConfig = import ./common-config.nix {
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inherit stdenv version structuredExtraConfig mkValueOverride;
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|
||||
# append extraConfig for backwards compatibility but also means the user can't override the kernelExtraConfig part
|
||||
extraConfig = extraConfig + lib.optionalString (stdenv.hostPlatform.platform ? kernelExtraConfig) stdenv.hostPlatform.platform.kernelExtraConfig;
|
||||
commonStructuredConfig = import ./common-config.nix {
|
||||
inherit stdenv version ;
|
||||
|
||||
features = kernelFeatures; # Ensure we know of all extra patches, etc.
|
||||
};
|
||||
|
||||
kernelConfigFun = baseConfig:
|
||||
# extra config in legacy string format
|
||||
extraConfig = extraConfig + lib.optionalString (stdenv.hostPlatform.platform ? kernelExtraConfig) stdenv.hostPlatform.platform.kernelExtraConfig;
|
||||
|
||||
intermediateNixConfig = configfile.moduleStructuredConfig.intermediateNixConfig;
|
||||
|
||||
structuredConfigFromPatches =
|
||||
map ({extraStructuredConfig ? {}, ...}: {settings=extraStructuredConfig;}) kernelPatches;
|
||||
|
||||
# appends kernel patches extraConfig
|
||||
kernelConfigFun = baseConfigStr:
|
||||
let
|
||||
configFromPatches =
|
||||
map ({extraConfig ? "", ...}: extraConfig) kernelPatches;
|
||||
in lib.concatStringsSep "\n" ([baseConfig] ++ configFromPatches);
|
||||
in lib.concatStringsSep "\n" ([baseConfigStr] ++ configFromPatches);
|
||||
|
||||
configfile = stdenv.mkDerivation {
|
||||
inherit ignoreConfigErrors autoModules preferBuiltin kernelArch;
|
||||
@ -131,7 +136,30 @@ let
|
||||
installPhase = "mv $buildRoot/.config $out";
|
||||
|
||||
enableParallelBuilding = true;
|
||||
};
|
||||
|
||||
passthru = rec {
|
||||
|
||||
module = import ../../../../nixos/modules/system/boot/kernel_config.nix;
|
||||
# used also in apache
|
||||
# { modules = [ { options = res.options; config = svc.config or svc; } ];
|
||||
# check = false;
|
||||
# The result is a set of two attributes
|
||||
moduleStructuredConfig = (lib.evalModules {
|
||||
modules = [
|
||||
module
|
||||
{ settings = commonStructuredConfig; }
|
||||
{ settings = structuredExtraConfig; }
|
||||
]
|
||||
++ structuredConfigFromPatches
|
||||
;
|
||||
}).config;
|
||||
|
||||
#
|
||||
structuredConfig = moduleStructuredConfig.settings;
|
||||
};
|
||||
|
||||
|
||||
}; # end of configfile derivation
|
||||
|
||||
kernel = (callPackage ./manual-config.nix {}) {
|
||||
inherit version modDirVersion src kernelPatches stdenv extraMeta configfile;
|
||||
@ -141,6 +169,7 @@ let
|
||||
|
||||
passthru = {
|
||||
features = kernelFeatures;
|
||||
inherit commonStructuredConfig;
|
||||
passthru = kernel.passthru // (removeAttrs passthru [ "passthru" ]);
|
||||
};
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user