Unify the Linux kernel configurations

Having N different copies of the NixOS kernel configuration is bad
because these copies tend to diverge.  For instance, our 3.10 config
lacked some modules that were enabled in older configs, probably
because the 3.10 config had been copied off an earlier version of some
older kernel config.

So now there is a single kernel config in common-config.nix.  It has a
few conditionals to deal with new/removed kernel options, but
otherwise it's pretty straightforward.

Also, a lot of cut&paste boilerplate between the kernel Nix
expressions is gone (such as preConfigure).

1 files changed, 288 insertions, 0 deletions

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
new file mode 100644
index 00000000000..4b19cd2aa2a
--- /dev/null
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -0,0 +1,288 @@
+{ stdenv, version, kernelPlatform, extraConfig }:
+
+with stdenv.lib;
+
+''
+  # Power management and debugging.
+  DEBUG_KERNEL y
+  PM_ADVANCED_DEBUG y
+  PM_RUNTIME y
+  TIMER_STATS y
+  ${optionalString (versionOlder version "3.10") ''
+    USB_SUSPEND y
+  ''}
+  BACKTRACE_SELF_TEST n
+  CPU_NOTIFIER_ERROR_INJECT? n
+  DEBUG_DEVRES n
+  DEBUG_NX_TEST n
+  DEBUG_STACK_USAGE n
+  DEBUG_STACKOVERFLOW n
+  RCU_TORTURE_TEST n
+  SCHEDSTATS n
+
+  # Support drivers that need external firmware.
+  STANDALONE n
+
+  # Make /proc/config.gz available.
+  IKCONFIG_PROC y
+
+  # Optimize with -O2, not -Os.
+  CC_OPTIMIZE_FOR_SIZE n
+
+  # Enable the kernel's built-in memory tester.
+  MEMTEST y
+
+  # Include the CFQ I/O scheduler in the kernel, rather than as a
+  # module, so that the initrd gets a good I/O scheduler.
+  IOSCHED_CFQ y
+  BLK_CGROUP y # required by CFQ
+
+  # Enable NUMA.
+  NUMA? y
+
+  # Disable some expensive (?) features.
+  FTRACE n
+  KPROBES n
+  PM_TRACE_RTC n
+
+  # Enable various subsystems.
+  ACCESSIBILITY y # Accessibility support
+  AUXDISPLAY y # Auxiliary Display support
+  DONGLE y # Serial dongle support
+  HIPPI y
+  MTD_COMPLEX_MAPPINGS y # needed for many devices
+  ${optionalString (versionOlder version "3.2") ''
+    NET_POCKET y # enable pocket and portable adapters
+  ''}
+  SCSI_LOWLEVEL y # enable lots of SCSI devices
+  SCSI_LOWLEVEL_PCMCIA y
+  SPI y # needed for many devices
+  SPI_MASTER y
+  WAN y
+
+  # Networking options.
+  IP_PNP n
+  IPV6_PRIVACY y
+  NETFILTER_ADVANCED y
+  IP_VS_PROTO_TCP y
+  IP_VS_PROTO_UDP y
+  IP_VS_PROTO_ESP y
+  IP_VS_PROTO_AH y
+  IP_DCCP_CCID3 n # experimental
+  CLS_U32_PERF y
+  CLS_U32_MARK y
+
+  # Wireless networking.
+  CFG80211_WEXT y # Without it, ipw2200 drivers don't build
+  IPW2100_MONITOR y # support promiscuous mode
+  IPW2200_MONITOR y # support promiscuous mode
+  HOSTAP_FIRMWARE y # Support downloading firmware images with Host AP driver
+  HOSTAP_FIRMWARE_NVRAM y
+  ATH9K_PCI y # Detect Atheros AR9xxx cards on PCI(e) bus
+  ATH9K_AHB y # Ditto, AHB bus
+  ${optionalString (versionAtLeast version "3.2") ''
+    B43_PHY_HT y
+  ''}
+  BCMA_HOST_PCI y
+
+  # Some settings to make sure that fbcondecor works - in particular,
+  # disable tileblitting and the drivers that need it.
+
+  # Enable various FB devices.
+  FB y
+  FB_EFI y
+  FB_NVIDIA_I2C y # Enable DDC Support
+  FB_RIVA_I2C y
+  FB_ATY_CT y # Mach64 CT/VT/GT/LT (incl. 3D RAGE) support
+  FB_ATY_GX y # Mach64 GX support
+  FB_SAVAGE_I2C y
+  FB_SAVAGE_ACCEL y
+  FB_SIS_300 y
+  FB_SIS_315 y
+  FB_3DFX_ACCEL y
+  FB_GEODE y
+
+  # Video configuration.
+  # Enable KMS for devices whose X.org driver supports it.
+  DRM_I915_KMS y
+  ${optionalString (versionOlder version "3.9") ''
+    DRM_RADEON_KMS y
+  ''}
+  # Hybrid graphics support
+  VGA_SWITCHEROO y
+
+  # Sound.
+  SND_AC97_POWER_SAVE y # AC97 Power-Saving Mode
+  SND_HDA_INPUT_BEEP y # Support digital beep via input layer
+  SND_USB_CAIAQ_INPUT y
+  PSS_MIXER y # Enable PSS mixer (Beethoven ADSP-16 and other compatible)
+
+  # USB serial devices.
+  USB_SERIAL_GENERIC y # USB Generic Serial Driver
+  USB_SERIAL_KEYSPAN_MPR y # include firmware for various USB serial devices
+  USB_SERIAL_KEYSPAN_USA28 y
+  USB_SERIAL_KEYSPAN_USA28X y
+  USB_SERIAL_KEYSPAN_USA28XA y
+  USB_SERIAL_KEYSPAN_USA28XB y
+  USB_SERIAL_KEYSPAN_USA19 y
+  USB_SERIAL_KEYSPAN_USA18X y
+  USB_SERIAL_KEYSPAN_USA19W y
+  USB_SERIAL_KEYSPAN_USA19QW y
+  USB_SERIAL_KEYSPAN_USA19QI y
+  USB_SERIAL_KEYSPAN_USA49W y
+  USB_SERIAL_KEYSPAN_USA49WLC y
+
+  # Filesystem options - in particular, enable extended attributes and
+  # ACLs for all filesystems that support them.
+  EXT2_FS_XATTR y
+  EXT2_FS_POSIX_ACL y
+  EXT2_FS_SECURITY y # Ext2 Security Labels
+  EXT2_FS_XIP y # Ext2 execute in place support
+  EXT4_FS_POSIX_ACL y
+  EXT4_FS_SECURITY y
+  REISERFS_FS_XATTR y
+  REISERFS_FS_POSIX_ACL y
+  REISERFS_FS_SECURITY y
+  JFS_POSIX_ACL y
+  JFS_SECURITY y
+  XFS_QUOTA y
+  XFS_POSIX_ACL y
+  XFS_RT y # XFS Realtime subvolume support
+  OCFS2_DEBUG_MASKLOG n
+  BTRFS_FS_POSIX_ACL y
+  UBIFS_FS_XATTR? y
+  UBIFS_FS_ADVANCED_COMPR y
+  NFSD_V2_ACL y
+  NFSD_V3 y
+  NFSD_V3_ACL y
+  NFSD_V4 y
+  NFS_FSCACHE y
+  CIFS_XATTR y
+  CIFS_POSIX y
+  CIFS_FSCACHE y
+
+  # Security related features.
+  STRICT_DEVMEM y # Filter access to /dev/mem
+  SECURITY_SELINUX_BOOTPARAM_VALUE 0 # disable SELinux by default
+
+  # Misc. options.
+  8139TOO_8129 y
+  8139TOO_PIO n # PIO is slower
+  AIC79XX_DEBUG_ENABLE n
+  AIC7XXX_DEBUG_ENABLE n
+  AIC94XX_DEBUG n
+  ${optionalString (versionAtLeast version "3.3") ''
+    AUDIT_LOGINUID_IMMUTABLE y
+  ''}
+  B43_PCMCIA y
+  BLK_DEV_CMD640_ENHANCED y # CMD640 enhanced support
+  BLK_DEV_IDEACPI y # IDE ACPI support
+  BLK_DEV_INTEGRITY y
+  BSD_PROCESS_ACCT_V3 y
+  BT_HCIUART_BCSP y
+  BT_HCIUART_H4 y # UART (H4) protocol support
+  BT_HCIUART_LL y
+  BT_RFCOMM_TTY? y # RFCOMM TTY support
+  CRASH_DUMP n
+  ${optionalString (versionOlder version "3.1") ''
+    DMAR? n # experimental
+  ''}
+  DVB_DYNAMIC_MINORS? y # we use udev
+  ${optionalString (versionAtLeast version "3.3") ''
+    EFI_STUB y # EFI bootloader in the bzImage itself
+  ''}
+  FHANDLE y # used by systemd
+  FUSION y # Fusion MPT device support
+  IDE_GD_ATAPI y # ATAPI floppy support
+  IRDA_ULTRA y # Ultra (connectionless) protocol
+  JOYSTICK_IFORCE_232 y # I-Force Serial joysticks and wheels
+  JOYSTICK_IFORCE_USB y # I-Force USB joysticks and wheels
+  JOYSTICK_XPAD_FF y # X-Box gamepad rumble support
+  JOYSTICK_XPAD_LEDS y # LED Support for Xbox360 controller 'BigX' LED
+  LDM_PARTITION y # Windows Logical Disk Manager (Dynamic Disk) support
+  LEDS_TRIGGER_IDE_DISK y # LED IDE Disk Trigger
+  LOGIRUMBLEPAD2_FF y # Logitech Rumblepad 2 force feedback
+  LOGO n # not needed
+  MEDIA_ATTACH y
+  MEGARAID_NEWGEN y
+  MICROCODE_AMD y
+  MODVERSIONS y
+  MOUSE_PS2_ELANTECH y # Elantech PS/2 protocol extension
+  MTRR_SANITIZER y
+  NET_FC y # Fibre Channel driver support
+  PPP_MULTILINK y # PPP multilink support
+  REGULATOR y # Voltage and Current Regulator Support
+  ${optionalString (versionAtLeast version "3.6") ''
+    RC_DEVICES? y # Enable IR devices
+  ''}
+  SCSI_LOGGING y # SCSI logging facility
+  SERIAL_8250 y # 8250/16550 and compatible serial support
+  SLIP_COMPRESSED y # CSLIP compressed headers
+  SLIP_SMART y
+  THERMAL_HWMON y # Hardware monitoring support
+  USB_DEBUG n
+  USB_EHCI_ROOT_HUB_TT y # Root Hub Transaction Translators
+  USB_EHCI_TT_NEWSCHED y # Improved transaction translator scheduling
+  X86_CHECK_BIOS_CORRUPTION y
+  X86_MCE y
+
+  # Linux containers.
+  RT_GROUP_SCHED? y
+  CGROUP_DEVICE? y
+  ${if versionAtLeast version "3.6" then ''
+    MEMCG y
+    MEMCG_SWAP y
+  '' else ''
+    CGROUP_MEM_RES_CTLR y
+    CGROUP_MEM_RES_CTLR_SWAP y
+  ''}
+  DEVPTS_MULTIPLE_INSTANCES y
+
+  # Enable staging drivers.  These are somewhat experimental, but
+  # they generally don't hurt.
+  STAGING y
+
+  # PROC_EVENTS requires that the netlink connector is not built
+  # as a module.  This is required by libcgroup's cgrulesengd.
+  CONNECTOR y
+  PROC_EVENTS y
+
+  # Tracing.
+  FTRACE y
+  FUNCTION_TRACER y
+  FTRACE_SYSCALLS y
+  SCHED_TRACER y
+
+  # Devtmpfs support.
+  DEVTMPFS y
+
+  # Easier debugging of NFS issues.
+  ${optionalString (versionAtLeast version "3.4") ''
+    SUNRPC_DEBUG y
+  ''}
+
+  # Virtualisation.
+  XEN_DOM0? y
+
+  # Media support.
+  ${optionalString (versionAtLeast version "3.6") ''
+    MEDIA_DIGITAL_TV_SUPPORT y
+    MEDIA_CAMERA_SUPPORT y
+    MEDIA_RC_SUPPORT y
+  ''}
+  ${optionalString (versionAtLeast version "3.7") ''
+    MEDIA_USB_SUPPORT y
+  ''}
+
+  # Our initrd init uses shebang scripts, so can't be modular.
+  ${optionalString (versionAtLeast version "3.10") ''
+    BINFMT_SCRIPT y
+  ''}
+
+  # Enable the 9P cache to speed up NixOS VM tests.
+  9P_FSCACHE y
+  9P_FS_POSIX_ACL y
+
+  ${kernelPlatform.kernelExtraConfig or ""}
+  ${extraConfig}
+''