arch/s390/Kconfig - linux - Git at Google

 config MMU
 	def_bool y

 config ZONE_DMA
 	def_bool y

 config LOCKDEP_SUPPORT
 	def_bool y

 config STACKTRACE_SUPPORT
 	def_bool y

 config HAVE_LATENCYTOP_SUPPORT
 	def_bool y

 config RWSEM_GENERIC_SPINLOCK
 	bool

 config RWSEM_XCHGADD_ALGORITHM
 	def_bool y

 config ARCH_HAS_ILOG2_U32
 	def_bool n

 config ARCH_HAS_ILOG2_U64
 	def_bool n

 config GENERIC_HWEIGHT
 	def_bool y

 config GENERIC_BUG
 	def_bool y if BUG

 config GENERIC_BUG_RELATIVE_POINTERS
 	def_bool y

 config NO_IOMEM
 	def_bool y

 config NO_DMA
 	def_bool y

 config ARCH_DMA_ADDR_T_64BIT
 	def_bool 64BIT

 config GENERIC_LOCKBREAK
 	def_bool y if SMP && PREEMPT

 config PGSTE
 	def_bool y if KVM

 config VIRT_CPU_ACCOUNTING
 	def_bool y

 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 	def_bool y

 config KEXEC
 	def_bool y

 config AUDIT_ARCH
 	def_bool y

 config S390
 	def_bool y
 	select USE_GENERIC_SMP_HELPERS if SMP
 	select GENERIC_CPU_DEVICES if !SMP
 	select HAVE_SYSCALL_WRAPPERS
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_SYSCALL_TRACEPOINTS
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_OPROFILE
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
 	select HAVE_KVM if 64BIT
 	select HAVE_ARCH_TRACEHOOK
 	select INIT_ALL_POSSIBLE
 	select HAVE_IRQ_WORK
 	select HAVE_PERF_EVENTS
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2
 	select HAVE_KERNEL_LZMA
 	select HAVE_KERNEL_LZO
 	select HAVE_KERNEL_XZ
 	select HAVE_ARCH_MUTEX_CPU_RELAX
 	select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
 	select HAVE_BPF_JIT if 64BIT && PACK_STACK
 	select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_CMPXCHG_LOCAL
 	select ARCH_DISCARD_MEMBLOCK
 	select BUILDTIME_EXTABLE_SORT
 	select ARCH_INLINE_SPIN_TRYLOCK
 	select ARCH_INLINE_SPIN_TRYLOCK_BH
 	select ARCH_INLINE_SPIN_LOCK
 	select ARCH_INLINE_SPIN_LOCK_BH
 	select ARCH_INLINE_SPIN_LOCK_IRQ
 	select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 	select ARCH_INLINE_SPIN_UNLOCK
 	select ARCH_INLINE_SPIN_UNLOCK_BH
 	select ARCH_INLINE_SPIN_UNLOCK_IRQ
 	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 	select ARCH_INLINE_READ_TRYLOCK
 	select ARCH_INLINE_READ_LOCK
 	select ARCH_INLINE_READ_LOCK_BH
 	select ARCH_INLINE_READ_LOCK_IRQ
 	select ARCH_INLINE_READ_LOCK_IRQSAVE
 	select ARCH_INLINE_READ_UNLOCK
 	select ARCH_INLINE_READ_UNLOCK_BH
 	select ARCH_INLINE_READ_UNLOCK_IRQ
 	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 	select ARCH_INLINE_WRITE_TRYLOCK
 	select ARCH_INLINE_WRITE_LOCK
 	select ARCH_INLINE_WRITE_LOCK_BH
 	select ARCH_INLINE_WRITE_LOCK_IRQ
 	select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 	select ARCH_INLINE_WRITE_UNLOCK
 	select ARCH_INLINE_WRITE_UNLOCK_BH
 	select ARCH_INLINE_WRITE_UNLOCK_IRQ
 	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL
 	select GENERIC_CLOCKEVENTS
 	select KTIME_SCALAR if 32BIT
 	select HAVE_ARCH_SECCOMP_FILTER

 config SCHED_OMIT_FRAME_POINTER
 	def_bool y

 source "init/Kconfig"

 source "kernel/Kconfig.freezer"

 menu "Processor type and features"

 config HAVE_MARCH_Z900_FEATURES
 	def_bool n

 config HAVE_MARCH_Z990_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z900_FEATURES

 config HAVE_MARCH_Z9_109_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z990_FEATURES

 config HAVE_MARCH_Z10_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z9_109_FEATURES

 config HAVE_MARCH_Z196_FEATURES
 	def_bool n
 	select HAVE_MARCH_Z10_FEATURES

 choice
 	prompt "Processor type"
 	default MARCH_G5

 config MARCH_G5
 	bool "System/390 model G5 and G6"
 	depends on !64BIT
 	help
 	  Select this to build a 31 bit kernel that works
 	  on all ESA/390 and z/Architecture machines.

 config MARCH_Z900
 	bool "IBM zSeries model z800 and z900"
 	select HAVE_MARCH_Z900_FEATURES if 64BIT
 	help
 	  Select this to enable optimizations for model z800/z900 (2064 and
 	  2066 series). This will enable some optimizations that are not
 	  available on older ESA/390 (31 Bit) only CPUs.

 config MARCH_Z990
 	bool "IBM zSeries model z890 and z990"
 	select HAVE_MARCH_Z990_FEATURES if 64BIT
 	help
 	  Select this to enable optimizations for model z890/z990 (2084 and
 	  2086 series). The kernel will be slightly faster but will not work
 	  on older machines.

 config MARCH_Z9_109
 	bool "IBM System z9"
 	select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 	help
 	  Select this to enable optimizations for IBM System z9 (2094 and
 	  2096 series). The kernel will be slightly faster but will not work
 	  on older machines.

 config MARCH_Z10
 	bool "IBM System z10"
 	select HAVE_MARCH_Z10_FEATURES if 64BIT
 	help
 	  Select this to enable optimizations for IBM System z10 (2097 and
 	  2098 series). The kernel will be slightly faster but will not work
 	  on older machines.

 config MARCH_Z196
 	bool "IBM zEnterprise 114 and 196"
 	select HAVE_MARCH_Z196_FEATURES if 64BIT
 	help
 	  Select this to enable optimizations for IBM zEnterprise 114 and 196
 	  (2818 and 2817 series). The kernel will be slightly faster but will
 	  not work on older machines.

 endchoice

 config 64BIT
 	def_bool y
 	prompt "64 bit kernel"
 	help
 	  Select this option if you have an IBM z/Architecture machine
 	  and want to use the 64 bit addressing mode.

 config 32BIT
 	def_bool y if !64BIT

 config COMPAT
 	def_bool y
 	prompt "Kernel support for 31 bit emulation"
 	depends on 64BIT
 	select COMPAT_BINFMT_ELF if BINFMT_ELF
 	select ARCH_WANT_OLD_COMPAT_IPC
 	help
 	  Select this option if you want to enable your system kernel to
 	  handle system-calls from ELF binaries for 31 bit ESA.  This option
 	  (and some other stuff like libraries and such) is needed for
 	  executing 31 bit applications.  It is safe to say "Y".

 config SYSVIPC_COMPAT
 	def_bool y if COMPAT && SYSVIPC

 config KEYS_COMPAT
 	def_bool y if COMPAT && KEYS

 config SMP
 	def_bool y
 	prompt "Symmetric multi-processing support"
 	---help---
 	  This enables support for systems with more than one CPU. If you have
 	  a system with only one CPU, like most personal computers, 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.

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

 	  Even if you don't know what to do here, say Y.

 config NR_CPUS
 	int "Maximum number of CPUs (2-64)"
 	range 2 64
 	depends on SMP
 	default "32" if !64BIT
 	default "64" if 64BIT
 	help
 	  This allows you to specify the maximum number of CPUs which this
 	  kernel will support.  The maximum supported value is 64 and the
 	  minimum value which makes sense is 2.

 	  This is purely to save memory - each supported CPU adds
 	  approximately sixteen kilobytes to the kernel image.

 config HOTPLUG_CPU
 	def_bool y
 	prompt "Support for hot-pluggable CPUs"
 	depends on SMP
 	select HOTPLUG
 	help
 	  Say Y here to be able to turn CPUs off and on. CPUs
 	  can be controlled through /sys/devices/system/cpu/cpu#.
 	  Say N if you want to disable CPU hotplug.

 config SCHED_MC
 	def_bool n

 config SCHED_BOOK
 	def_bool y
 	prompt "Book scheduler support"
 	depends on SMP
 	select SCHED_MC
 	help
 	  Book scheduler support improves the CPU scheduler's decision making
 	  when dealing with machines that have several books.

 source kernel/Kconfig.preempt

 config MATHEMU
 	def_bool y
 	prompt "IEEE FPU emulation"
 	depends on MARCH_G5
 	help
 	  This option is required for IEEE compliant floating point arithmetic
 	  on older ESA/390 machines. Say Y unless you know your machine doesn't
 	  need this.

 source kernel/Kconfig.hz

 endmenu

 menu "Memory setup"

 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
 	select SPARSEMEM_VMEMMAP_ENABLE
 	select SPARSEMEM_VMEMMAP
 	select SPARSEMEM_STATIC if !64BIT

 config ARCH_SPARSEMEM_DEFAULT
 	def_bool y

 config ARCH_SELECT_MEMORY_MODEL
 	def_bool y

 config ARCH_ENABLE_MEMORY_HOTPLUG
 	def_bool y if SPARSEMEM

 config ARCH_ENABLE_MEMORY_HOTREMOVE
 	def_bool y

 config FORCE_MAX_ZONEORDER
 	int
 	default "9"

 source "mm/Kconfig"

 config PACK_STACK
 	def_bool y
 	prompt "Pack kernel stack"
 	help
 	  This option enables the compiler option -mkernel-backchain if it
 	  is available. If the option is available the compiler supports
 	  the new stack layout which dramatically reduces the minimum stack
 	  frame size. With an old compiler a non-leaf function needs a
 	  minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 	  -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 	  and 24 byte on 64 bit.

 	  Say Y if you are unsure.

 config SMALL_STACK
 	def_bool n
 	prompt "Use 8kb for kernel stack instead of 16kb"
 	depends on PACK_STACK && 64BIT && !LOCKDEP
 	help
 	  If you say Y here and the compiler supports the -mkernel-backchain
 	  option the kernel will use a smaller kernel stack size. The reduced
 	  size is 8kb instead of 16kb. This allows to run more threads on a
 	  system and reduces the pressure on the memory management for higher
 	  order page allocations.

 	  Say N if you are unsure.

 config CHECK_STACK
 	def_bool y
 	prompt "Detect kernel stack overflow"
 	help
 	  This option enables the compiler option -mstack-guard and
 	  -mstack-size if they are available. If the compiler supports them
 	  it will emit additional code to each function prolog to trigger
 	  an illegal operation if the kernel stack is about to overflow.

 	  Say N if you are unsure.

 config STACK_GUARD
 	int "Size of the guard area (128-1024)"
 	range 128 1024
 	depends on CHECK_STACK
 	default "256"
 	help
 	  This allows you to specify the size of the guard area at the lower
 	  end of the kernel stack. If the kernel stack points into the guard
 	  area on function entry an illegal operation is triggered. The size
 	  needs to be a power of 2. Please keep in mind that the size of an
 	  interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 	  The minimum size for the stack guard should be 256 for 31 bit and
 	  512 for 64 bit.

 config WARN_DYNAMIC_STACK
 	def_bool n
 	prompt "Emit compiler warnings for function with dynamic stack usage"
 	help
 	  This option enables the compiler option -mwarn-dynamicstack. If the
 	  compiler supports this options generates warnings for functions
 	  that dynamically allocate stack space using alloca.

 	  Say N if you are unsure.

 endmenu

 menu "I/O subsystem"

 config QDIO
 	def_tristate y
 	prompt "QDIO support"
 	---help---
 	  This driver provides the Queued Direct I/O base support for
 	  IBM System z.

 	  To compile this driver as a module, choose M here: the
 	  module will be called qdio.

 	  If unsure, say Y.

 config CHSC_SCH
 	def_tristate m
 	prompt "Support for CHSC subchannels"
 	help
 	  This driver allows usage of CHSC subchannels. A CHSC subchannel
 	  is usually present on LPAR only.
 	  The driver creates a device /dev/chsc, which may be used to
 	  obtain I/O configuration information about the machine and
 	  to issue asynchronous chsc commands (DANGEROUS).
 	  You will usually only want to use this interface on a special
 	  LPAR designated for system management.

 	  To compile this driver as a module, choose M here: the
 	  module will be called chsc_sch.

 	  If unsure, say N.

 config SCM_BUS
 	def_bool y
 	depends on 64BIT
 	prompt "SCM bus driver"
 	help
 	  Bus driver for Storage Class Memory.

 endmenu

 menu "Dump support"

 config CRASH_DUMP
 	bool "kernel crash dumps"
 	depends on 64BIT && SMP
 	select KEXEC
 	help
 	  Generate crash dump after being started by kexec.
 	  Crash dump kernels are loaded in the main kernel with kexec-tools
 	  into a specially reserved region and then later executed after
 	  a crash by kdump/kexec.
 	  For more details see Documentation/kdump/kdump.txt

 config ZFCPDUMP
 	def_bool n
 	prompt "zfcpdump support"
 	select SMP
 	help
 	  Select this option if you want to build an zfcpdump enabled kernel.
 	  Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.

 endmenu

 menu "Executable file formats / Emulations"

 source "fs/Kconfig.binfmt"

 config SECCOMP
 	def_bool y
 	prompt "Enable seccomp to safely compute untrusted bytecode"
 	depends on PROC_FS
 	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.

 endmenu

 menu "Power Management"

 config ARCH_HIBERNATION_POSSIBLE
 	def_bool y if 64BIT

 source "kernel/power/Kconfig"

 endmenu

 source "net/Kconfig"

 config PCMCIA
 	def_bool n

 config CCW
 	def_bool y

 source "drivers/Kconfig"

 source "fs/Kconfig"

 source "arch/s390/Kconfig.debug"

 source "security/Kconfig"

 source "crypto/Kconfig"

 source "lib/Kconfig"

 menu "Virtualization"

 config PFAULT
 	def_bool y
 	prompt "Pseudo page fault support"
 	help
 	  Select this option, if you want to use PFAULT pseudo page fault
 	  handling under VM. If running native or in LPAR, this option
 	  has no effect. If your VM does not support PFAULT, PAGEEX
 	  pseudo page fault handling will be used.
 	  Note that VM 4.2 supports PFAULT but has a bug in its
 	  implementation that causes some problems.
 	  Everybody who wants to run Linux under VM != VM4.2 should select
 	  this option.

 config SHARED_KERNEL
 	def_bool y
 	prompt "VM shared kernel support"
 	help
 	  Select this option, if you want to share the text segment of the
 	  Linux kernel between different VM guests. This reduces memory
 	  usage with lots of guests but greatly increases kernel size.
 	  Also if a kernel was IPL'ed from a shared segment the kexec system
 	  call will not work.
 	  You should only select this option if you know what you are
 	  doing and want to exploit this feature.

 config CMM
 	def_tristate n
 	prompt "Cooperative memory management"
 	help
 	  Select this option, if you want to enable the kernel interface
 	  to reduce the memory size of the system. This is accomplished
 	  by allocating pages of memory and put them "on hold". This only
 	  makes sense for a system running under VM where the unused pages
 	  will be reused by VM for other guest systems. The interface
 	  allows an external monitor to balance memory of many systems.
 	  Everybody who wants to run Linux under VM should select this
 	  option.

 config CMM_IUCV
 	def_bool y
 	prompt "IUCV special message interface to cooperative memory management"
 	depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 	help
 	  Select this option to enable the special message interface to
 	  the cooperative memory management.

 config APPLDATA_BASE
 	def_bool n
 	prompt "Linux - VM Monitor Stream, base infrastructure"
 	depends on PROC_FS
 	help
 	  This provides a kernel interface for creating and updating z/VM APPLDATA
 	  monitor records. The monitor records are updated at certain time
 	  intervals, once the timer is started.
 	  Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 	  i.e. enables or disables monitoring on the Linux side.
 	  A custom interval value (in seconds) can be written to
 	  /proc/appldata/interval.

 	  Defaults are 60 seconds interval and timer off.
 	  The /proc entries can also be read from, showing the current settings.

 config APPLDATA_MEM
 	def_tristate m
 	prompt "Monitor memory management statistics"
 	depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 	help
 	  This provides memory management related data to the Linux - VM Monitor
 	  Stream, like paging/swapping rate, memory utilisation, etc.
 	  Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 	  APPLDATA monitor record, i.e. enables or disables monitoring this record
 	  on the z/VM side.

 	  Default is disabled.
 	  The /proc entry can also be read from, showing the current settings.

 	  This can also be compiled as a module, which will be called
 	  appldata_mem.o.

 config APPLDATA_OS
 	def_tristate m
 	prompt "Monitor OS statistics"
 	depends on APPLDATA_BASE
 	help
 	  This provides OS related data to the Linux - VM Monitor Stream, like
 	  CPU utilisation, etc.
 	  Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 	  APPLDATA monitor record, i.e. enables or disables monitoring this record
 	  on the z/VM side.

 	  Default is disabled.
 	  This can also be compiled as a module, which will be called
 	  appldata_os.o.

 config APPLDATA_NET_SUM
 	def_tristate m
 	prompt "Monitor overall network statistics"
 	depends on APPLDATA_BASE && NET
 	help
 	  This provides network related data to the Linux - VM Monitor Stream,
 	  currently there is only a total sum of network I/O statistics, no
 	  per-interface data.
 	  Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 	  APPLDATA monitor record, i.e. enables or disables monitoring this record
 	  on the z/VM side.

 	  Default is disabled.
 	  This can also be compiled as a module, which will be called
 	  appldata_net_sum.o.

 config S390_HYPFS_FS
 	def_bool y
 	prompt "s390 hypervisor file system support"
 	select SYS_HYPERVISOR
 	help
 	  This is a virtual file system intended to provide accounting
 	  information in an s390 hypervisor environment.

 source "arch/s390/kvm/Kconfig"

 config S390_GUEST
 	def_bool y
 	prompt "s390 support for virtio devices (EXPERIMENTAL)"
 	depends on 64BIT && EXPERIMENTAL
 	select VIRTUALIZATION
 	select VIRTIO
 	select VIRTIO_RING
 	select VIRTIO_CONSOLE
 	help
 	  Enabling this option adds support for virtio based paravirtual device
 	  drivers on s390.

 	  Select this option if you want to run the kernel as a guest under
 	  the KVM hypervisor.

 endmenu
	config MMU
	def_bool y

	config ZONE_DMA
	def_bool y

	config LOCKDEP_SUPPORT
	def_bool y

	config STACKTRACE_SUPPORT
	def_bool y

	config HAVE_LATENCYTOP_SUPPORT
	def_bool y

	config RWSEM_GENERIC_SPINLOCK
	bool

	config RWSEM_XCHGADD_ALGORITHM
	def_bool y

	config ARCH_HAS_ILOG2_U32
	def_bool n

	config ARCH_HAS_ILOG2_U64
	def_bool n

	config GENERIC_HWEIGHT
	def_bool y

	config GENERIC_BUG
	def_bool y if BUG

	config GENERIC_BUG_RELATIVE_POINTERS
	def_bool y

	config NO_IOMEM
	def_bool y

	config NO_DMA
	def_bool y

	config ARCH_DMA_ADDR_T_64BIT
	def_bool 64BIT

	config GENERIC_LOCKBREAK
	def_bool y if SMP && PREEMPT

	config PGSTE
	def_bool y if KVM

	config VIRT_CPU_ACCOUNTING
	def_bool y

	config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y

	config KEXEC
	def_bool y

	config AUDIT_ARCH
	def_bool y

	config S390
	def_bool y
	select USE_GENERIC_SMP_HELPERS if SMP
	select GENERIC_CPU_DEVICES if !SMP
	select HAVE_SYSCALL_WRAPPERS
	select HAVE_FUNCTION_TRACER
	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
	select HAVE_FTRACE_MCOUNT_RECORD
	select HAVE_C_RECORDMCOUNT
	select HAVE_SYSCALL_TRACEPOINTS
	select HAVE_DYNAMIC_FTRACE
	select HAVE_FUNCTION_GRAPH_TRACER
	select HAVE_REGS_AND_STACK_ACCESS_API
	select HAVE_OPROFILE
	select HAVE_KPROBES
	select HAVE_KRETPROBES
	select HAVE_KVM if 64BIT
	select HAVE_ARCH_TRACEHOOK
	select INIT_ALL_POSSIBLE
	select HAVE_IRQ_WORK
	select HAVE_PERF_EVENTS
	select ARCH_HAVE_NMI_SAFE_CMPXCHG
	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_BZIP2
	select HAVE_KERNEL_LZMA
	select HAVE_KERNEL_LZO
	select HAVE_KERNEL_XZ
	select HAVE_ARCH_MUTEX_CPU_RELAX
	select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
	select HAVE_BPF_JIT if 64BIT && PACK_STACK
	select ARCH_SAVE_PAGE_KEYS if HIBERNATION
	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
	select HAVE_MEMBLOCK
	select HAVE_MEMBLOCK_NODE_MAP
	select HAVE_CMPXCHG_LOCAL
	select ARCH_DISCARD_MEMBLOCK
	select BUILDTIME_EXTABLE_SORT
	select ARCH_INLINE_SPIN_TRYLOCK
	select ARCH_INLINE_SPIN_TRYLOCK_BH
	select ARCH_INLINE_SPIN_LOCK
	select ARCH_INLINE_SPIN_LOCK_BH
	select ARCH_INLINE_SPIN_LOCK_IRQ
	select ARCH_INLINE_SPIN_LOCK_IRQSAVE
	select ARCH_INLINE_SPIN_UNLOCK
	select ARCH_INLINE_SPIN_UNLOCK_BH
	select ARCH_INLINE_SPIN_UNLOCK_IRQ
	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
	select ARCH_INLINE_READ_TRYLOCK
	select ARCH_INLINE_READ_LOCK
	select ARCH_INLINE_READ_LOCK_BH
	select ARCH_INLINE_READ_LOCK_IRQ
	select ARCH_INLINE_READ_LOCK_IRQSAVE
	select ARCH_INLINE_READ_UNLOCK
	select ARCH_INLINE_READ_UNLOCK_BH
	select ARCH_INLINE_READ_UNLOCK_IRQ
	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
	select ARCH_INLINE_WRITE_TRYLOCK
	select ARCH_INLINE_WRITE_LOCK
	select ARCH_INLINE_WRITE_LOCK_BH
	select ARCH_INLINE_WRITE_LOCK_IRQ
	select ARCH_INLINE_WRITE_LOCK_IRQSAVE
	select ARCH_INLINE_WRITE_UNLOCK
	select ARCH_INLINE_WRITE_UNLOCK_BH
	select ARCH_INLINE_WRITE_UNLOCK_IRQ
	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
	select ARCH_WANT_IPC_PARSE_VERSION
	select GENERIC_SMP_IDLE_THREAD
	select GENERIC_TIME_VSYSCALL
	select GENERIC_CLOCKEVENTS
	select KTIME_SCALAR if 32BIT
	select HAVE_ARCH_SECCOMP_FILTER

	config SCHED_OMIT_FRAME_POINTER
	def_bool y

	source "init/Kconfig"

	source "kernel/Kconfig.freezer"

	menu "Processor type and features"

	config HAVE_MARCH_Z900_FEATURES
	def_bool n

	config HAVE_MARCH_Z990_FEATURES
	def_bool n
	select HAVE_MARCH_Z900_FEATURES

	config HAVE_MARCH_Z9_109_FEATURES
	def_bool n
	select HAVE_MARCH_Z990_FEATURES

	config HAVE_MARCH_Z10_FEATURES
	def_bool n
	select HAVE_MARCH_Z9_109_FEATURES

	config HAVE_MARCH_Z196_FEATURES
	def_bool n
	select HAVE_MARCH_Z10_FEATURES

	choice
	prompt "Processor type"
	default MARCH_G5

	config MARCH_G5
	bool "System/390 model G5 and G6"
	depends on !64BIT
	help
	Select this to build a 31 bit kernel that works
	on all ESA/390 and z/Architecture machines.

	config MARCH_Z900
	bool "IBM zSeries model z800 and z900"
	select HAVE_MARCH_Z900_FEATURES if 64BIT
	help
	Select this to enable optimizations for model z800/z900 (2064 and
	2066 series). This will enable some optimizations that are not
	available on older ESA/390 (31 Bit) only CPUs.

	config MARCH_Z990
	bool "IBM zSeries model z890 and z990"
	select HAVE_MARCH_Z990_FEATURES if 64BIT
	help
	Select this to enable optimizations for model z890/z990 (2084 and
	2086 series). The kernel will be slightly faster but will not work
	on older machines.

	config MARCH_Z9_109
	bool "IBM System z9"
	select HAVE_MARCH_Z9_109_FEATURES if 64BIT
	help
	Select this to enable optimizations for IBM System z9 (2094 and
	2096 series). The kernel will be slightly faster but will not work
	on older machines.

	config MARCH_Z10
	bool "IBM System z10"
	select HAVE_MARCH_Z10_FEATURES if 64BIT
	help
	Select this to enable optimizations for IBM System z10 (2097 and
	2098 series). The kernel will be slightly faster but will not work
	on older machines.

	config MARCH_Z196
	bool "IBM zEnterprise 114 and 196"
	select HAVE_MARCH_Z196_FEATURES if 64BIT
	help
	Select this to enable optimizations for IBM zEnterprise 114 and 196
	(2818 and 2817 series). The kernel will be slightly faster but will
	not work on older machines.

	endchoice

	config 64BIT
	def_bool y
	prompt "64 bit kernel"
	help
	Select this option if you have an IBM z/Architecture machine
	and want to use the 64 bit addressing mode.

	config 32BIT
	def_bool y if !64BIT

	config COMPAT
	def_bool y
	prompt "Kernel support for 31 bit emulation"
	depends on 64BIT
	select COMPAT_BINFMT_ELF if BINFMT_ELF
	select ARCH_WANT_OLD_COMPAT_IPC
	help
	Select this option if you want to enable your system kernel to
	handle system-calls from ELF binaries for 31 bit ESA. This option
	(and some other stuff like libraries and such) is needed for
	executing 31 bit applications. It is safe to say "Y".

	config SYSVIPC_COMPAT
	def_bool y if COMPAT && SYSVIPC

	config KEYS_COMPAT
	def_bool y if COMPAT && KEYS

	config SMP
	def_bool y
	prompt "Symmetric multi-processing support"
	---help---
	This enables support for systems with more than one CPU. If you have
	a system with only one CPU, like most personal computers, 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.

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

	Even if you don't know what to do here, say Y.

	config NR_CPUS
	int "Maximum number of CPUs (2-64)"
	range 2 64
	depends on SMP
	default "32" if !64BIT
	default "64" if 64BIT
	help
	This allows you to specify the maximum number of CPUs which this
	kernel will support. The maximum supported value is 64 and the
	minimum value which makes sense is 2.

	This is purely to save memory - each supported CPU adds
	approximately sixteen kilobytes to the kernel image.

	config HOTPLUG_CPU
	def_bool y
	prompt "Support for hot-pluggable CPUs"
	depends on SMP
	select HOTPLUG
	help
	Say Y here to be able to turn CPUs off and on. CPUs
	can be controlled through /sys/devices/system/cpu/cpu#.
	Say N if you want to disable CPU hotplug.

	config SCHED_MC
	def_bool n

	config SCHED_BOOK
	def_bool y
	prompt "Book scheduler support"
	depends on SMP
	select SCHED_MC
	help
	Book scheduler support improves the CPU scheduler's decision making
	when dealing with machines that have several books.

	source kernel/Kconfig.preempt

	config MATHEMU
	def_bool y
	prompt "IEEE FPU emulation"
	depends on MARCH_G5
	help
	This option is required for IEEE compliant floating point arithmetic
	on older ESA/390 machines. Say Y unless you know your machine doesn't
	need this.

	source kernel/Kconfig.hz

	endmenu

	menu "Memory setup"

	config ARCH_SPARSEMEM_ENABLE
	def_bool y
	select SPARSEMEM_VMEMMAP_ENABLE
	select SPARSEMEM_VMEMMAP
	select SPARSEMEM_STATIC if !64BIT

	config ARCH_SPARSEMEM_DEFAULT
	def_bool y

	config ARCH_SELECT_MEMORY_MODEL
	def_bool y

	config ARCH_ENABLE_MEMORY_HOTPLUG
	def_bool y if SPARSEMEM

	config ARCH_ENABLE_MEMORY_HOTREMOVE
	def_bool y

	config FORCE_MAX_ZONEORDER
	int
	default "9"

	source "mm/Kconfig"

	config PACK_STACK
	def_bool y
	prompt "Pack kernel stack"
	help
	This option enables the compiler option -mkernel-backchain if it
	is available. If the option is available the compiler supports
	the new stack layout which dramatically reduces the minimum stack
	frame size. With an old compiler a non-leaf function needs a
	minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
	-mkernel-backchain the minimum size drops to 16 byte on 31 bit
	and 24 byte on 64 bit.

	Say Y if you are unsure.

	config SMALL_STACK
	def_bool n
	prompt "Use 8kb for kernel stack instead of 16kb"
	depends on PACK_STACK && 64BIT && !LOCKDEP
	help
	If you say Y here and the compiler supports the -mkernel-backchain
	option the kernel will use a smaller kernel stack size. The reduced
	size is 8kb instead of 16kb. This allows to run more threads on a
	system and reduces the pressure on the memory management for higher
	order page allocations.

	Say N if you are unsure.

	config CHECK_STACK
	def_bool y
	prompt "Detect kernel stack overflow"
	help
	This option enables the compiler option -mstack-guard and
	-mstack-size if they are available. If the compiler supports them
	it will emit additional code to each function prolog to trigger
	an illegal operation if the kernel stack is about to overflow.

	Say N if you are unsure.

	config STACK_GUARD
	int "Size of the guard area (128-1024)"
	range 128 1024
	depends on CHECK_STACK
	default "256"
	help
	This allows you to specify the size of the guard area at the lower
	end of the kernel stack. If the kernel stack points into the guard
	area on function entry an illegal operation is triggered. The size
	needs to be a power of 2. Please keep in mind that the size of an
	interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
	The minimum size for the stack guard should be 256 for 31 bit and
	512 for 64 bit.

	config WARN_DYNAMIC_STACK
	def_bool n
	prompt "Emit compiler warnings for function with dynamic stack usage"
	help
	This option enables the compiler option -mwarn-dynamicstack. If the
	compiler supports this options generates warnings for functions
	that dynamically allocate stack space using alloca.

	Say N if you are unsure.

	endmenu

	menu "I/O subsystem"

	config QDIO
	def_tristate y
	prompt "QDIO support"
	---help---
	This driver provides the Queued Direct I/O base support for
	IBM System z.

	To compile this driver as a module, choose M here: the
	module will be called qdio.

	If unsure, say Y.

	config CHSC_SCH
	def_tristate m
	prompt "Support for CHSC subchannels"
	help
	This driver allows usage of CHSC subchannels. A CHSC subchannel
	is usually present on LPAR only.
	The driver creates a device /dev/chsc, which may be used to
	obtain I/O configuration information about the machine and
	to issue asynchronous chsc commands (DANGEROUS).
	You will usually only want to use this interface on a special
	LPAR designated for system management.

	To compile this driver as a module, choose M here: the
	module will be called chsc_sch.

	If unsure, say N.

	config SCM_BUS
	def_bool y
	depends on 64BIT
	prompt "SCM bus driver"
	help
	Bus driver for Storage Class Memory.

	endmenu

	menu "Dump support"

	config CRASH_DUMP
	bool "kernel crash dumps"
	depends on 64BIT && SMP
	select KEXEC
	help
	Generate crash dump after being started by kexec.
	Crash dump kernels are loaded in the main kernel with kexec-tools
	into a specially reserved region and then later executed after
	a crash by kdump/kexec.
	For more details see Documentation/kdump/kdump.txt

	config ZFCPDUMP
	def_bool n
	prompt "zfcpdump support"
	select SMP
	help
	Select this option if you want to build an zfcpdump enabled kernel.
	Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.

	endmenu

	menu "Executable file formats / Emulations"

	source "fs/Kconfig.binfmt"

	config SECCOMP
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
	depends on PROC_FS
	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.

	endmenu

	menu "Power Management"

	config ARCH_HIBERNATION_POSSIBLE
	def_bool y if 64BIT

	source "kernel/power/Kconfig"

	endmenu

	source "net/Kconfig"

	config PCMCIA
	def_bool n

	config CCW
	def_bool y

	source "drivers/Kconfig"

	source "fs/Kconfig"

	source "arch/s390/Kconfig.debug"

	source "security/Kconfig"

	source "crypto/Kconfig"

	source "lib/Kconfig"

	menu "Virtualization"

	config PFAULT
	def_bool y
	prompt "Pseudo page fault support"
	help
	Select this option, if you want to use PFAULT pseudo page fault
	handling under VM. If running native or in LPAR, this option
	has no effect. If your VM does not support PFAULT, PAGEEX
	pseudo page fault handling will be used.
	Note that VM 4.2 supports PFAULT but has a bug in its
	implementation that causes some problems.
	Everybody who wants to run Linux under VM != VM4.2 should select
	this option.

	config SHARED_KERNEL
	def_bool y
	prompt "VM shared kernel support"
	help
	Select this option, if you want to share the text segment of the
	Linux kernel between different VM guests. This reduces memory
	usage with lots of guests but greatly increases kernel size.
	Also if a kernel was IPL'ed from a shared segment the kexec system
	call will not work.
	You should only select this option if you know what you are
	doing and want to exploit this feature.

	config CMM
	def_tristate n
	prompt "Cooperative memory management"
	help
	Select this option, if you want to enable the kernel interface
	to reduce the memory size of the system. This is accomplished
	by allocating pages of memory and put them "on hold". This only
	makes sense for a system running under VM where the unused pages
	will be reused by VM for other guest systems. The interface
	allows an external monitor to balance memory of many systems.
	Everybody who wants to run Linux under VM should select this
	option.

	config CMM_IUCV
	def_bool y
	prompt "IUCV special message interface to cooperative memory management"
	depends on CMM && (SMSGIUCV=y \|\| CMM=SMSGIUCV)
	help
	Select this option to enable the special message interface to
	the cooperative memory management.

	config APPLDATA_BASE
	def_bool n
	prompt "Linux - VM Monitor Stream, base infrastructure"
	depends on PROC_FS
	help
	This provides a kernel interface for creating and updating z/VM APPLDATA
	monitor records. The monitor records are updated at certain time
	intervals, once the timer is started.
	Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
	i.e. enables or disables monitoring on the Linux side.
	A custom interval value (in seconds) can be written to
	/proc/appldata/interval.

	Defaults are 60 seconds interval and timer off.
	The /proc entries can also be read from, showing the current settings.

	config APPLDATA_MEM
	def_tristate m
	prompt "Monitor memory management statistics"
	depends on APPLDATA_BASE && VM_EVENT_COUNTERS
	help
	This provides memory management related data to the Linux - VM Monitor
	Stream, like paging/swapping rate, memory utilisation, etc.
	Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
	APPLDATA monitor record, i.e. enables or disables monitoring this record
	on the z/VM side.

	Default is disabled.
	The /proc entry can also be read from, showing the current settings.

	This can also be compiled as a module, which will be called
	appldata_mem.o.

	config APPLDATA_OS
	def_tristate m
	prompt "Monitor OS statistics"
	depends on APPLDATA_BASE
	help
	This provides OS related data to the Linux - VM Monitor Stream, like
	CPU utilisation, etc.
	Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
	APPLDATA monitor record, i.e. enables or disables monitoring this record
	on the z/VM side.

	Default is disabled.
	This can also be compiled as a module, which will be called
	appldata_os.o.

	config APPLDATA_NET_SUM
	def_tristate m
	prompt "Monitor overall network statistics"
	depends on APPLDATA_BASE && NET
	help
	This provides network related data to the Linux - VM Monitor Stream,
	currently there is only a total sum of network I/O statistics, no
	per-interface data.
	Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
	APPLDATA monitor record, i.e. enables or disables monitoring this record
	on the z/VM side.

	Default is disabled.
	This can also be compiled as a module, which will be called
	appldata_net_sum.o.

	config S390_HYPFS_FS
	def_bool y
	prompt "s390 hypervisor file system support"
	select SYS_HYPERVISOR
	help
	This is a virtual file system intended to provide accounting
	information in an s390 hypervisor environment.

	source "arch/s390/kvm/Kconfig"

	config S390_GUEST
	def_bool y
	prompt "s390 support for virtio devices (EXPERIMENTAL)"
	depends on 64BIT && EXPERIMENTAL
	select VIRTUALIZATION
	select VIRTIO
	select VIRTIO_RING
	select VIRTIO_CONSOLE
	help
	Enabling this option adds support for virtio based paravirtual device
	drivers on s390.

	Select this option if you want to run the kernel as a guest under
	the KVM hypervisor.

	endmenu