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+#
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/kconfig-language.txt.
+#
+
+config MMU
+ bool
+ default y
+
+config RWSEM_GENERIC_SPINLOCK
+ bool
+
+config RWSEM_XCHGADD_ALGORITHM
+ bool
+ default y
+
+config GENERIC_CALIBRATE_DELAY
+ bool
+ default y
+
+config GENERIC_BUST_SPINLOCK
+ bool
+
+mainmenu "Linux Kernel Configuration"
+
+config ARCH_S390
+ bool
+ default y
+
+config UID16
+ bool
+ default y
+ depends on ARCH_S390X = 'n'
+
+source "init/Kconfig"
+
+menu "Base setup"
+
+comment "Processor type and features"
+
+config ARCH_S390X
+ bool "64 bit kernel"
+ help
+ Select this option if you have a 64 bit IBM zSeries machine
+ and want to use the 64 bit addressing mode.
+
+config 64BIT
+ def_bool ARCH_S390X
+
+config ARCH_S390_31
+ bool
+ depends on ARCH_S390X = 'n'
+ default y
+
+config SMP
+ bool "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 <file:Documentation/smp.txt> and 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"
+ 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
+ bool "Support for hot-pluggable CPUs"
+ depends on SMP
+ select HOTPLUG
+ default n
+ 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 MATHEMU
+ bool "IEEE FPU emulation"
+ depends on MARCH_G5
+ help
+ This option is required for IEEE compliant floating point arithmetic
+ on older S/390 machines. Say Y unless you know your machine doesn't
+ need this.
+
+config S390_SUPPORT
+ bool "Kernel support for 31 bit emulation"
+ depends on ARCH_S390X
+ 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 COMPAT
+ bool
+ depends on S390_SUPPORT
+ default y
+
+config SYSVIPC_COMPAT
+ bool
+ depends on COMPAT && SYSVIPC
+ default y
+
+config BINFMT_ELF32
+ tristate "Kernel support for 31 bit ELF binaries"
+ depends on S390_SUPPORT
+ help
+ This allows you to run 32-bit Linux/ELF binaries on your zSeries
+ in 64 bit mode. Everybody wants this; say Y.
+
+comment "Code generation options"
+
+choice
+ prompt "Processor type"
+ default MARCH_G5
+
+config MARCH_G5
+ bool "S/390 model G5 and G6"
+ depends on ARCH_S390_31
+ help
+ Select this to build a 31 bit kernel that works
+ on all S/390 and zSeries machines.
+
+config MARCH_Z900
+ bool "IBM eServer zSeries model z800 and z900"
+ help
+ Select this to optimize for zSeries machines. This
+ will enable some optimizations that are not available
+ on older 31 bit only CPUs.
+
+config MARCH_Z990
+ bool "IBM eServer zSeries model z890 and z990"
+ help
+ Select this enable optimizations for model z890/z990.
+ This will be slightly faster but does not work on
+ older machines such as the z900.
+
+endchoice
+
+config PACK_STACK
+ bool "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
+ bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
+ depends on PACK_STACK
+ help
+ If you say Y here and the compiler supports the -mkernel-backchain
+ option the kernel will use a smaller kernel stack size. For 31 bit
+ the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
+ instead of 16kb. This allows to run more thread 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
+ bool "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_STACK
+ bool "Emit compiler warnings for function with broken stack usage"
+ help
+ This option enables the compiler options -mwarn-framesize and
+ -mwarn-dynamicstack. If the compiler supports these options it
+ will generate warnings for function which either use alloca or
+ create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
+
+ Say N if you are unsure.
+
+config WARN_STACK_SIZE
+ int "Maximum frame size considered safe (128-2048)"
+ range 128 2048
+ depends on WARN_STACK
+ default "256"
+ help
+ This allows you to specify the maximum frame size a function may
+ have without the compiler complaining about it.
+
+comment "I/O subsystem configuration"
+
+config MACHCHK_WARNING
+ bool "Process warning machine checks"
+ help
+ Select this option if you want the machine check handler on IBM S/390 or
+ zSeries to process warning machine checks (e.g. on power failures).
+ If unsure, say "Y".
+
+config QDIO
+ tristate "QDIO support"
+ ---help---
+ This driver provides the Queued Direct I/O base support for the
+ IBM S/390 (G5 and G6) and eServer zSeries (z800, z890, z900 and z990).
+
+ For details please refer to the documentation provided by IBM at
+ <http://www10.software.ibm.com/developerworks/opensource/linux390>
+
+ To compile this driver as a module, choose M here: the
+ module will be called qdio.
+
+ If unsure, say Y.
+
+config QDIO_PERF_STATS
+ bool "Performance statistics in /proc"
+ depends on QDIO
+ help
+ Say Y here to get performance statistics in /proc/qdio_perf
+
+ If unsure, say N.
+
+config QDIO_DEBUG
+ bool "Extended debugging information"
+ depends on QDIO
+ help
+ Say Y here to get extended debugging output in /proc/s390dbf/qdio...
+ Warning: this option reduces the performance of the QDIO module.
+
+ If unsure, say N.
+
+comment "Misc"
+
+config PREEMPT
+ bool "Preemptible Kernel"
+ help
+ This option reduces the latency of the kernel when reacting to
+ real-time or interactive events by allowing a low priority process to
+ be preempted even if it is in kernel mode executing a system call.
+ This allows applications to run more reliably even when the system is
+ under load.
+
+ Say N if you are unsure.
+
+config IPL
+ bool "Builtin IPL record support"
+ help
+ If you want to use the produced kernel to IPL directly from a
+ device, you have to merge a bootsector specific to the device
+ into the first bytes of the kernel. You will have to select the
+ IPL device.
+
+choice
+ prompt "IPL method generated into head.S"
+ depends on IPL
+ default IPL_TAPE
+ help
+ Select "tape" if you want to IPL the image from a Tape.
+
+ Select "vm_reader" if you are running under VM/ESA and want
+ to IPL the image from the emulated card reader.
+
+config IPL_TAPE
+ bool "tape"
+
+config IPL_VM
+ bool "vm_reader"
+
+endchoice
+
+source "fs/Kconfig.binfmt"
+
+config PROCESS_DEBUG
+ bool "Show crashed user process info"
+ help
+ Say Y to print all process fault locations to the console. This is
+ a debugging option; you probably do not want to set it unless you
+ are an S390 port maintainer.
+
+config PFAULT
+ bool "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
+ bool "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.
+ You should only select this option if you know what you are
+ doing and want to exploit this feature.
+
+config CMM
+ tristate "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_PROC
+ bool "/proc interface to cooperative memory management"
+ depends on CMM
+ help
+ Select this option to enable the /proc interface to the
+ cooperative memory management.
+
+config CMM_IUCV
+ bool "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 VIRT_TIMER
+ bool "Virtual CPU timer support"
+ help
+ This provides a kernel interface for virtual CPU timers.
+ Default is disabled.
+
+config VIRT_CPU_ACCOUNTING
+ bool "Base user process accounting on virtual cpu timer"
+ depends on VIRT_TIMER
+ help
+ Select this option to use CPU timer deltas to do user
+ process accounting.
+
+config APPLDATA_BASE
+ bool "Linux - VM Monitor Stream, base infrastructure"
+ depends on PROC_FS && VIRT_TIMER=y
+ 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
+ tristate "Monitor memory management statistics"
+ depends on APPLDATA_BASE
+ 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
+ tristate "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
+ tristate "Monitor overall network statistics"
+ depends on APPLDATA_BASE
+ 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 NO_IDLE_HZ
+ bool "No HZ timer ticks in idle"
+ help
+ Switches the regular HZ timer off when the system is going idle.
+ This helps z/VM to detect that the Linux system is idle. VM can
+ then "swap-out" this guest which reduces memory usage. It also
+ reduces the overhead of idle systems.
+
+ The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
+ hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
+ timer is active.
+
+config NO_IDLE_HZ_INIT
+ bool "HZ timer in idle off by default"
+ depends on NO_IDLE_HZ
+ help
+ The HZ timer is switched off in idle by default. That means the
+ HZ timer is already disabled at boot time.
+
+endmenu
+
+config PCMCIA
+ bool
+ default n
+
+source "drivers/base/Kconfig"
+
+source "drivers/scsi/Kconfig"
+
+source "drivers/s390/Kconfig"
+
+source "net/Kconfig"
+
+source "fs/Kconfig"
+
+source "arch/s390/oprofile/Kconfig"
+
+source "arch/s390/Kconfig.debug"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"