sparc64: Only allocate per-cpu areas for possible cpus.

[linux.git] / arch / sparc / Kconfig

# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#

mainmenu "Linux/SPARC Kernel Configuration"

config 64BIT
	bool "64-bit kernel" if ARCH = "sparc"
	default ARCH = "sparc64"
	help
	  SPARC is a family of RISC microprocessors designed and marketed by
	  Sun Microsystems, incorporated.  They are very widely found in Sun
	  workstations and clones.

	  Say yes to build a 64-bit kernel - formerly known as sparc64
	  Say no to build a 32-bit kernel - formerly known as sparc

config SPARC
	bool
	default y
	select HAVE_IDE
	select HAVE_OPROFILE
	select HAVE_ARCH_KGDB if !SMP || SPARC64
	select HAVE_ARCH_TRACEHOOK
	select ARCH_WANT_OPTIONAL_GPIOLIB
	select RTC_CLASS
	select RTC_DRV_M48T59

config SPARC32
	def_bool !64BIT

config SPARC64
	def_bool 64BIT
	select ARCH_SUPPORTS_MSI
	select HAVE_FUNCTION_TRACER
	select HAVE_KRETPROBES
	select HAVE_KPROBES
	select HAVE_LMB
	select HAVE_SYSCALL_WRAPPERS
	select USE_GENERIC_SMP_HELPERS if SMP
	select RTC_DRV_CMOS
	select RTC_DRV_BQ4802
	select RTC_DRV_SUN4V
	select RTC_DRV_STARFIRE

config ARCH_DEFCONFIG
	string
	default "arch/sparc/configs/sparc32_defconfig" if SPARC32
	default "arch/sparc/configs/sparc64_defconfig" if SPARC64

# CONFIG_BITS can be used at source level to get 32/64 bits
config BITS
	int
	default 32 if SPARC32
	default 64 if SPARC64

config GENERIC_TIME
	bool
	default y if SPARC64

config GENERIC_CMOS_UPDATE
	bool
	default y if SPARC64

config GENERIC_CLOCKEVENTS
	bool
	default y if SPARC64

config IOMMU_HELPER
	bool
	default y if SPARC64

config QUICKLIST
	bool
	default y if SPARC64

config STACKTRACE_SUPPORT
	bool
	default y if SPARC64

config LOCKDEP_SUPPORT
	bool
	default y if SPARC64

config HAVE_LATENCYTOP_SUPPORT
	bool
	default y if SPARC64

config AUDIT_ARCH
	bool
	default y

config HAVE_SETUP_PER_CPU_AREA
	def_bool y if SPARC64

config GENERIC_HARDIRQS_NO__DO_IRQ
	bool
	def_bool y if SPARC64

config MMU
	bool
	default y

config HIGHMEM
	bool
	default y if SPARC32

config ZONE_DMA
	bool
	default y if SPARC32

config GENERIC_ISA_DMA
	bool
	default y if SPARC32

config GENERIC_GPIO
	bool
	help
	  Generic GPIO API support

config ARCH_NO_VIRT_TO_BUS
	def_bool y

config OF
	def_bool y

config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y if SPARC64

source "init/Kconfig"

source "kernel/Kconfig.freezer"

menu "Processor type and features"

config SMP
	bool "Symmetric multi-processing support (does not work on sun4/sun4c)"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, say N. If you have a system with more
	  than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  will run faster if you say N here.

	  People using multiprocessor machines who say Y here should also say
	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
	  Management" code will be disabled if you say Y here.

	  See also <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO
	  available at <http://www.tldp.org/docs.html#howto>.

	  If you don't know what to do here, say N.

config NR_CPUS
	int "Maximum number of CPUs"
	depends on SMP
	range 2 32 if SPARC32
	range 2 1024 if SPARC64
	default 32 if SPARC32
	default 64 if SPARC64

source kernel/Kconfig.hz

config RWSEM_GENERIC_SPINLOCK
	bool
	default y if SPARC32

config RWSEM_XCHGADD_ALGORITHM
	bool
	default y if SPARC64

config GENERIC_FIND_NEXT_BIT
	bool
	default y

config GENERIC_HWEIGHT
	bool
	default y if !ULTRA_HAS_POPULATION_COUNT

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config ARCH_MAY_HAVE_PC_FDC
	bool
	default y

config EMULATED_CMPXCHG
	bool
	default y if SPARC32
	help
	  Sparc32 does not have a CAS instruction like sparc64. cmpxchg()
	  is emulated, and therefore it is not completely atomic.

# Makefile helpers
config SPARC32_SMP
	bool
	default y
	depends on SPARC32 && SMP

config SPARC64_SMP
	bool
	default y
	depends on SPARC64 && SMP

choice
	prompt "Kernel page size" if SPARC64
	default SPARC64_PAGE_SIZE_8KB

config SPARC64_PAGE_SIZE_8KB
	bool "8KB"
	help
	  This lets you select the page size of the kernel.

	  8KB and 64KB work quite well, since SPARC ELF sections
	  provide for up to 64KB alignment.

	  If you don't know what to do, choose 8KB.

config SPARC64_PAGE_SIZE_64KB
	bool "64KB"

endchoice

config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	depends on SPARC64 && PROC_FS
	default y
	help
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via /proc/<pid>/seccomp, it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs"
	depends on SPARC64 && SMP
	select HOTPLUG
	help
	  Say Y here to experiment with turning CPUs off and on.  CPUs
	  can be controlled through /sys/devices/system/cpu/cpu#.
	  Say N if you want to disable CPU hotplug.

config GENERIC_HARDIRQS
	bool
	default y if SPARC64

source "kernel/time/Kconfig"

if SPARC64
source "drivers/cpufreq/Kconfig"

config US3_FREQ
	tristate "UltraSPARC-III CPU Frequency driver"
	depends on CPU_FREQ
	select CPU_FREQ_TABLE
	help
	  This adds the CPUFreq driver for UltraSPARC-III processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

config US2E_FREQ
	tristate "UltraSPARC-IIe CPU Frequency driver"
	depends on CPU_FREQ
	select CPU_FREQ_TABLE
	help
	  This adds the CPUFreq driver for UltraSPARC-IIe processors.

	  For details, take a look at <file:Documentation/cpu-freq>.

	  If in doubt, say N.

endif

config US3_MC
	tristate "UltraSPARC-III Memory Controller driver"
	depends on SPARC64
	default y
	help
	  This adds a driver for the UltraSPARC-III memory controller.
	  Loading this driver allows exact mnemonic strings to be
	  printed in the event of a memory error, so that the faulty DIMM
	  on the motherboard can be matched to the error.

	  If in doubt, say Y, as this information can be very useful.

# Global things across all Sun machines.
config GENERIC_LOCKBREAK
	bool
	default y
	depends on SPARC64 && SMP && PREEMPT

choice
	prompt "SPARC64 Huge TLB Page Size"
	depends on SPARC64 && HUGETLB_PAGE
	default HUGETLB_PAGE_SIZE_4MB

config HUGETLB_PAGE_SIZE_4MB
	bool "4MB"

config HUGETLB_PAGE_SIZE_512K
	bool "512K"

config HUGETLB_PAGE_SIZE_64K
	depends on !SPARC64_PAGE_SIZE_64KB
	bool "64K"

endchoice

config NUMA
	bool "NUMA support"
	depends on SPARC64 && SMP

config NODES_SHIFT
	int
	default "4"
	depends on NEED_MULTIPLE_NODES

# Some NUMA nodes have memory ranges that span
# other nodes.  Even though a pfn is valid and
# between a node's start and end pfns, it may not
# reside on that node.  See memmap_init_zone()
# for details.
config NODES_SPAN_OTHER_NODES
	def_bool y
	depends on NEED_MULTIPLE_NODES

config ARCH_POPULATES_NODE_MAP
	def_bool y if SPARC64

config ARCH_SELECT_MEMORY_MODEL
	def_bool y if SPARC64

config ARCH_SPARSEMEM_ENABLE
	def_bool y if SPARC64
	select SPARSEMEM_VMEMMAP_ENABLE

config ARCH_SPARSEMEM_DEFAULT
	def_bool y if SPARC64

source "mm/Kconfig"

config SCHED_SMT
	bool "SMT (Hyperthreading) scheduler support"
	depends on SPARC64 && SMP
	default y
	help
	  SMT scheduler support improves the CPU scheduler's decision making
	  when dealing with SPARC cpus at a cost of slightly increased overhead
	  in some places. If unsure say N here.

config SCHED_MC
	bool "Multi-core scheduler support"
	depends on SPARC64 && SMP
	default y
	help
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

if SPARC64
source "kernel/Kconfig.preempt"
endif

config CMDLINE_BOOL
	bool "Default bootloader kernel arguments"
	depends on SPARC64

config CMDLINE
	string "Initial kernel command string"
	depends on CMDLINE_BOOL
	default "console=ttyS0,9600 root=/dev/sda1"
	help
	  Say Y here if you want to be able to pass default arguments to
	  the kernel. This will be overridden by the bootloader, if you
	  use one (such as SILO). This is most useful if you want to boot
	  a kernel from TFTP, and want default options to be available
	  with having them passed on the command line.

	  NOTE: This option WILL override the PROM bootargs setting!

config SUN_PM
	bool
	default y if SPARC32
	help
	  Enable power management and CPU standby features on supported
	  SPARC platforms.

config SPARC_LED
	tristate "Sun4m LED driver"
	depends on SPARC32
	help
	  This driver toggles the front-panel LED on sun4m systems
	  in a user-specifiable manner.  Its state can be probed
	  by reading /proc/led and its blinking mode can be changed
	  via writes to /proc/led

config SERIAL_CONSOLE
	bool
	depends on SPARC32
	default y
	---help---
	  If you say Y here, it will be possible to use a serial port as the
	  system console (the system console is the device which receives all
	  kernel messages and warnings and which allows logins in single user
	  mode). This could be useful if some terminal or printer is connected
	  to that serial port.

	  Even if you say Y here, the currently visible virtual console
	  (/dev/tty0) will still be used as the system console by default, but
	  you can alter that using a kernel command line option such as
	  "console=ttyS1". (Try "man bootparam" or see the documentation of
	  your boot loader (silo) about how to pass options to the kernel at
	  boot time.)

	  If you don't have a graphics card installed and you say Y here, the
	  kernel will automatically use the first serial line, /dev/ttyS0, as
	  system console.

	  If unsure, say N.

endmenu

menu "Bus options (PCI etc.)"
config SBUS
	bool
	default y

config SBUSCHAR
	bool
	default y

config SUN_LDOMS
	bool "Sun Logical Domains support"
	depends on SPARC64
	help
	  Say Y here is you want to support virtual devices via
	  Logical Domains.

config PCI
	bool "Support for PCI and PS/2 keyboard/mouse"
	help
	  Find out whether your system includes a PCI bus. PCI is the name of
	  a bus system, i.e. the way the CPU talks to the other stuff inside
	  your box.  If you say Y here, the kernel will include drivers and
	  infrastructure code to support PCI bus devices.

	  CONFIG_PCI is needed for all JavaStation's (including MrCoffee),
	  CP-1200, JavaEngine-1, Corona, Red October, and Serengeti SGSC.
	  All of these platforms are extremely obscure, so say N if unsure.

config PCI_DOMAINS
	def_bool PCI if SPARC64

config PCI_SYSCALL
	def_bool PCI

source "drivers/pci/Kconfig"

source "drivers/pcmcia/Kconfig"

config SUN_OPENPROMFS
	tristate "Openprom tree appears in /proc/openprom"
	help
	  If you say Y, the OpenPROM device tree will be available as a
	  virtual file system, which you can mount to /proc/openprom by "mount
	  -t openpromfs none /proc/openprom".

	  To compile the /proc/openprom support as a module, choose M here: the
	  module will be called openpromfs.

	  Only choose N if you know in advance that you will not need to modify
	  OpenPROM settings on the running system.

# Makefile helpers
config SPARC32_PCI
	bool
	default y
	depends on SPARC32 && PCI

config SPARC64_PCI
	bool
	default y
	depends on SPARC64 && PCI

endmenu

menu "Executable file formats"

source "fs/Kconfig.binfmt"

config COMPAT
	bool
	depends on SPARC64
	default y
	select COMPAT_BINFMT_ELF

config SYSVIPC_COMPAT
	bool
	depends on COMPAT && SYSVIPC
	default y

endmenu

source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/sbus/char/Kconfig"

source "fs/Kconfig"

source "arch/sparc/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"