linux: Enable some kernel features

This enables a few features that should be useful and safe (they're all used by the default Ubuntu kernel config), in particular zswap, wakelocks, kernel load address randomization, userfaultfd (useful for QEMU), paravirtualized spinlocks and automatic process group scheduling. Also removes some configuration conditional on kernel versions that we no longer support.
2024-11-24 07:53:19 +00:00 · 2016-07-11 14:19:55 +02:00 · 2016-07-11 14:19:55 +02:00 · 7b9c493d60
commit 7b9c493d60
parent 1cd7dbc00b
1 changed files with 41 additions and 71 deletions
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@ -67,6 +67,7 @@ with stdenv.lib;
  ${optionalString (versionOlder version "3.10") ''
    USB_SUSPEND y
  ''}
+  PM_WAKELOCKS y

  # Support drivers that need external firmware.
  STANDALONE n
@ -98,9 +99,6 @@ with stdenv.lib;
  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
  SCSI_SAS_ATA y  # added to enable detection of hard drive
@ -137,9 +135,7 @@ with stdenv.lib;
  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
-  ''}
+  B43_PHY_HT? y
  BCMA_HOST_PCI? y

  # Enable various FB devices.
@ -157,7 +153,7 @@ with stdenv.lib;
  FB_VESA y
  FRAMEBUFFER_CONSOLE y
  FRAMEBUFFER_CONSOLE_ROTATION y
-  ${optionalString (versionOlder version "3.9" || stdenv.system == "i686-linux") ''
+  ${optionalString (stdenv.system == "i686-linux") ''
    FB_GEODE y
  ''}

@ -168,11 +164,7 @@ with stdenv.lib;
  ''}
  # Allow specifying custom EDID on the kernel command line
  DRM_LOAD_EDID_FIRMWARE y
-  ${optionalString (versionOlder version "3.9") ''
-    DRM_RADEON_KMS? y
-  ''}
-  # Hybrid graphics support
-  VGA_SWITCHEROO y
+  VGA_SWITCHEROO y # Hybrid graphics support

  # Sound.
  SND_DYNAMIC_MINORS y
@ -231,9 +223,7 @@ with stdenv.lib;
    NFSD_V4_SECURITY_LABEL y
  ''}
  NFS_FSCACHE y
-  ${optionalString (versionAtLeast version "3.6") ''
-    NFS_SWAP y
-  ''}
+  NFS_SWAP y
  NFS_V3_ACL y
  ${optionalString (versionAtLeast version "3.11") ''
    NFS_V4_1 y  # NFSv4.1 client support
@ -265,6 +255,7 @@ with stdenv.lib;
  DEBUG_SET_MODULE_RONX? y # Detect writes to read-only module pages

  # Security related features.
+  RANDOMIZE_BASE y
  STRICT_DEVMEM y # Filter access to /dev/mem
  SECURITY_SELINUX_BOOTPARAM_VALUE 0 # Disable SELinux by default
  DEVKMEM n # Disable /dev/kmem
@ -310,25 +301,25 @@ with stdenv.lib;
  BT_HCIUART_BCSP? y
  BT_HCIUART_H4? y # UART (H4) protocol support
  BT_HCIUART_LL? y
-  ${optionalString (versionAtLeast version "3.4") ''
-    BT_RFCOMM_TTY? y # RFCOMM TTY support
-  ''}
+  BT_RFCOMM_TTY? y # RFCOMM TTY support
+  CLEANCACHE? y
  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
-  ''}
+  EFI_STUB y # EFI bootloader in the bzImage itself
  FHANDLE y # used by systemd
+  FRONTSWAP y
  FUSION y # Fusion MPT device support
  IDE_GD_ATAPI y # ATAPI floppy support
+  ${optionalString (versionAtLeast version "4.3") ''
+    IDLE_PAGE_TRACKING y
+  ''}
  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
+  KEXEC_FILE y
+  KEXEC_JUMP y
  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
@ -349,12 +340,9 @@ with stdenv.lib;
  PPP_MULTILINK y # PPP multilink support
  PPP_FILTER y
  REGULATOR y # Voltage and Current Regulator Support
-  ${optionalString (versionAtLeast version "3.6") ''
-    RC_DEVICES? y # Enable IR devices
-  ''}
-  ${optionalString (versionAtLeast version "3.10") ''
-    RT2800USB_RT55XX y
-  ''}
+  RC_DEVICES? y # Enable IR devices
+  RT2800USB_RT55XX y
+  SCHED_AUTOGROUP y
  SCSI_LOGGING y # SCSI logging facility
  SERIAL_8250 y # 8250/16550 and compatible serial support
  SLIP_COMPRESSED y # CSLIP compressed headers
@ -369,6 +357,9 @@ with stdenv.lib;
  ''}
  USB_EHCI_ROOT_HUB_TT y # Root Hub Transaction Translators
  USB_EHCI_TT_NEWSCHED y # Improved transaction translator scheduling
+  ${optionalString (versionAtLeast version "4.3") ''
+    USERFAULTFD y
+  ''}
  X86_CHECK_BIOS_CORRUPTION y
  X86_MCE y

@ -379,16 +370,14 @@ with stdenv.lib;
  NAMESPACES? y #  Required by 'unshare' used by 'nixos-install'
  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
-  ''}
+  MEMCG y
+  MEMCG_SWAP y
  ${optionalString (versionOlder version "4.7") "DEVPTS_MULTIPLE_INSTANCES y"}
  BLK_DEV_THROTTLING y
  CFQ_GROUP_IOSCHED y
+  ${optionalString (versionAtLeast version "4.3") ''
+    CGROUP_PIDS y
+  ''}

  # Enable staging drivers.  These are somewhat experimental, but
  # they generally don't hurt.
@ -406,9 +395,7 @@ with stdenv.lib;
  FTRACE_SYSCALLS y
  SCHED_TRACER y
  STACK_TRACER y
-  ${optionalString (versionAtLeast version "3.10") ''
-    UPROBE_EVENT y
-  ''}
+  UPROBE_EVENT y
  ${optionalString (versionAtLeast version "4.4") ''
    BPF_SYSCALL y
    BPF_EVENTS y
@ -420,28 +407,18 @@ with stdenv.lib;
  DEVTMPFS y

  # Easier debugging of NFS issues.
-  ${optionalString (versionAtLeast version "3.4") ''
-    SUNRPC_DEBUG y
-  ''}
+  SUNRPC_DEBUG y

  # Virtualisation.
  PARAVIRT? y
-  ${if versionAtLeast version "3.10" then ''
-    HYPERVISOR_GUEST y
-  '' else ''
-    PARAVIRT_GUEST? y
-  ''}
+  HYPERVISOR_GUEST y
+  PARAVIRT_SPINLOCKS? y
  KVM_APIC_ARCHITECTURE y
  KVM_ASYNC_PF y
-  ${optionalString (versionOlder version "3.7") ''
-    KVM_CLOCK? y
-  ''}
  ${optionalString (versionAtLeast version "4.0") ''
    KVM_COMPAT? y
  ''}
-  ${optionalString (versionAtLeast version "3.10") ''
-    KVM_DEVICE_ASSIGNMENT? y
-  ''}
+  KVM_DEVICE_ASSIGNMENT? y
  ${optionalString (versionAtLeast version "4.0") ''
    KVM_GENERIC_DIRTYLOG_READ_PROTECT y
  ''}
@ -476,28 +453,22 @@ with stdenv.lib;
  ${optionalString (!stdenv.is64bit) ''
    HIGHMEM64G? y # We need 64 GB (PAE) support for Xen guest support.
  ''}
-  ${optionalString (versionAtLeast version "3.9" && stdenv.is64bit) ''
+  ${optionalString (stdenv.is64bit) ''
    VFIO_PCI_VGA y
  ''}
  VIRT_DRIVERS 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
-    ${optionalString (!(features.chromiumos or false)) ''
-      MEDIA_PCI_SUPPORT y
-    ''}
+  MEDIA_DIGITAL_TV_SUPPORT y
+  MEDIA_CAMERA_SUPPORT y
+  MEDIA_RC_SUPPORT y
+  MEDIA_USB_SUPPORT y
+  ${optionalString (!(features.chromiumos or false)) ''
+    MEDIA_PCI_SUPPORT y
  ''}

  # Our initrd init uses shebang scripts, so can't be modular.
-  ${optionalString (versionAtLeast version "3.10") ''
-    BINFMT_SCRIPT y
-  ''}
+  BINFMT_SCRIPT y

  # For systemd-binfmt
  BINFMT_MISC? y
@ -512,10 +483,9 @@ with stdenv.lib;
  TRANSPARENT_HUGEPAGE_MADVISE? y

  # zram support (e.g for in-memory compressed swap).
-  ${optionalString (versionAtLeast version "3.4") ''
-    ZSMALLOC y
-  ''}
+  ZSMALLOC y
  ZRAM m
+  ZSWAP y

  # Enable PCIe and USB for the brcmfmac driver
  BRCMFMAC_USB? y