linux_chromiumos_3_18: remove kernel due lack of maintainer/breakage

There is no maintainer for this package, probably not many users.
It requires effort to fix all third-party modules for this old kernel
versions. It might contain unpatched security holes.

For Pixel chromebooks, we have the samus-kernel.
Apart from that https://github.com/GalliumOS/linux might be a good choice.

pkgs/os-specific/linux/acpi-call/default.nix

@@ -24,7 +24,7 @@ stdenv.mkDerivation {
     sed -e "s@/lib/modules/\$(.*)@${kernel.dev}/lib/modules/${kernel.modDirVersion}@" -i Makefile
     sed -e 's@acpi/acpi[.]h@linux/acpi.h@g' -i acpi_call.c
   '';
- 
+
   installPhase = ''
     mkdir -p $out/lib/modules/${kernel.modDirVersion}/misc
     cp acpi_call.ko $out/lib/modules/${kernel.modDirVersion}/misc
@@ -37,6 +37,5 @@ stdenv.mkDerivation {
     maintainers = [stdenv.lib.maintainers.raskin];
     platforms = stdenv.lib.platforms.linux;
     description = "A module allowing arbitrary ACPI calls; use case: hybrid video";
-    broken = kernel.features.chromiumos or false;
   };
 }

pkgs/os-specific/linux/ena/default.nix

@@ -37,6 +37,5 @@ stdenv.mkDerivation rec {
     license = lib.licenses.gpl2;
     maintainers = [ lib.maintainers.eelco ];
     platforms = lib.platforms.linux;
-    broken = kernel.features.chromiumos or false;
   };
 }

pkgs/os-specific/linux/kernel/common-config.nix

@@ -202,7 +202,7 @@ with stdenv.lib;
 
   # Video configuration.
   # Enable KMS for devices whose X.org driver supports it.
-  ${optionalString (versionOlder version "4.3" && !(features.chromiumos or false)) ''
+  ${optionalString (versionOlder version "4.3") ''
     DRM_I915_KMS y
   ''}
   # Allow specifying custom EDID on the kernel command line
@@ -566,9 +566,7 @@ with stdenv.lib;
   MEDIA_CAMERA_SUPPORT y
   MEDIA_RC_SUPPORT y
   MEDIA_USB_SUPPORT y
-  ${optionalString (!(features.chromiumos or false)) ''
-    MEDIA_PCI_SUPPORT y
-  ''}
+  MEDIA_PCI_SUPPORT y
 
   # Our initrd init uses shebang scripts, so can't be modular.
   BINFMT_SCRIPT y
@@ -662,67 +660,6 @@ with stdenv.lib;
     WW_MUTEX_SELFTEST? n
   ''}
 
-  # ChromiumOS support
-  ${optionalString (features.chromiumos or false) ''
-    CHROME_PLATFORMS y
-    VGA_SWITCHEROO n
-    MMC_SDHCI_PXAV2 n
-    NET_IPVTI n
-    IPV6_VTI n
-    REGULATOR_FIXED_VOLTAGE n
-    TPS6105X n
-    CPU_FREQ_STAT y
-    IPV6 y
-    MFD_CROS_EC y
-    MFD_CROS_EC_LPC y
-    MFD_CROS_EC_DEV y
-    CHARGER_CROS_USB_PD y
-    I2C y
-    MEDIA_SUBDRV_AUTOSELECT n
-    VIDEO_IR_I2C n
-    BLK_DEV_DM y
-    ANDROID_PARANOID_NETWORK n
-    DM_VERITY n
-    DRM_VGEM n
-    CPU_FREQ_GOV_INTERACTIVE n
-    INPUT_KEYRESET n
-    DM_BOOTCACHE n
-    UID_CPUTIME n
-
-    ${optionalString (versionAtLeast version "3.18") ''
-      CPUFREQ_DT n
-      EXTCON_CROS_EC n
-      DRM_POWERVR_ROGUE n
-      CHROMEOS_OF_FIRMWARE y
-      TEST_RHASHTABLE n
-      BCMDHD n
-      TRUSTY n
-    ''}
-
-    ${optionalString (versionOlder version "3.18") ''
-      MALI_MIDGARD n
-      DVB_USB_DIB0700 n
-      DVB_USB_DW2102 n
-      DVB_USB_PCTV452E n
-      DVB_USB_TTUSB2 n
-      DVB_USB_AF9015 n
-      DVB_USB_AF9035 n
-      DVB_USB_ANYSEE n
-      DVB_USB_AZ6007 n
-      DVB_USB_IT913X n
-      DVB_USB_LME2510 n
-      DVB_USB_RTL28XXU n
-      USB_S2255 n
-      VIDEO_EM28XX n
-      VIDEO_TM6000 n
-      USB_DWC2 n
-      USB_GSPCA n
-      SPEAKUP n
-      XO15_EBOOK n
-      USB_GADGET n
-    ''}
-  ''}
-
   ${kernelPlatform.kernelExtraConfig or ""}
   ${extraConfig}
 ''

pkgs/os-specific/linux/kernel/patches.nix

@@ -56,16 +56,6 @@ rec {
       patch = ./genksyms-fix-segfault.patch;
     };
 
-  chromiumos_Kconfig_fix_entries_3_18 =
-    { name = "Kconfig_fix_entries_3_18";
-      patch = ./chromiumos-patches/fix-double-Kconfig-entry-3.18.patch;
-    };
-
-  chromiumos_no_link_restrictions =
-    { name = "chromium-no-link-restrictions";
-      patch = ./chromiumos-patches/no-link-restrictions.patch;
-    };
-
   cpu-cgroup-v2 = import ./cpu-cgroup-v2-patches;
 
   DCCP_double_free_vulnerability_CVE-2017-6074 = rec

pkgs/os-specific/linux/lttng-modules/default.nix

@@ -29,9 +29,7 @@ stdenv.mkDerivation rec {
     license = with licenses; [ lgpl21 gpl2 mit ];
     platforms = platforms.linux;
     maintainers = [ maintainers.bjornfor ];
-    broken =
-      (builtins.compareVersions kernel.version "3.18" == -1) ||
-      (kernel.features.chromiumos or false);
+    broken = builtins.compareVersions kernel.version "3.18" == -1;
   };
 
 }

pkgs/top-level/all-packages.nix

@@ -12286,18 +12286,6 @@ with pkgs;
 
   linux_samus_latest = linux_samus_4_12;
 
-  linux_chromiumos_3_18 = callPackage ../os-specific/linux/kernel/linux-chromiumos-3.18.nix {
-    kernelPatches = [ kernelPatches.chromiumos_Kconfig_fix_entries_3_18
-                      kernelPatches.chromiumos_no_link_restrictions
-                      kernelPatches.genksyms_fix_segfault
-                      kernelPatches.DCCP_double_free_vulnerability_CVE-2017-6074
-                    ];
-    # compiler-gcc.h:107:30: fatal error: linux/compiler-gcc6.h: No such file or directory
-    stdenv = overrideCC stdenv gcc5;
-  };
-
-  linux_chromiumos_latest = linux_chromiumos_3_18;
-
   /* Linux kernel modules are inherently tied to a specific kernel.  So
      rather than provide specific instances of those packages for a
      specific kernel, we have a function that builds those packages
@@ -12480,10 +12468,6 @@ with pkgs;
   linuxPackages_samus_4_12 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_samus_4_12);
   linuxPackages_samus_latest = recurseIntoAttrs (linuxPackagesFor pkgs.linux_samus_latest);
 
-  # ChromiumOS kernels
-  linuxPackages_chromiumos_3_18 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_chromiumos_3_18);
-  linuxPackages_chromiumos_latest = recurseIntoAttrs (linuxPackagesFor pkgs.linux_chromiumos_latest);
-
   # A function to build a manually-configured kernel
   linuxManualConfig = pkgs.buildLinux;
   buildLinux = makeOverridable (callPackage ../os-specific/linux/kernel/manual-config.nix {});