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#

# For a description of the syntax of this configuration file,

# see Documentation/kbuild/kconfig-language.txt.

#

config MMU

        def_bool y

config ZONE_DMA

        def_bool y

        depends on 64BIT

config LOCKDEP_SUPPORT

        def_bool y

config STACKTRACE_SUPPORT

        def_bool y

config RWSEM_GENERIC_SPINLOCK

        bool

config RWSEM_XCHGADD_ALGORITHM

        def_bool y

config ARCH_HAS_ILOG2_U32

        bool

        default n

config ARCH_HAS_ILOG2_U64

        bool

        default n

config GENERIC_HWEIGHT

        def_bool y

config GENERIC_TIME

        def_bool y

config GENERIC_BUG

        bool

        depends on BUG

        default y

config NO_IOMEM

        def_bool y

config NO_DMA

        def_bool y

mainmenu "Linux Kernel Configuration"

config S390

        def_bool y

source "init/Kconfig"

menu "Base setup"

comment "Processor type and features"

config 64BIT

        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 32BIT

        bool

        default y if !64BIT

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  and the SMP-HOWTO

          available at .

          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 COMPAT

        bool "Kernel support for 31 bit emulation"

        depends on 64BIT

        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

        bool

        depends on COMPAT && SYSVIPC

        default y

config AUDIT_ARCH

        bool

        default y

config S390_SWITCH_AMODE

        bool "Switch kernel/user addressing modes"

        help

          This option allows to switch the addressing modes of kernel and user

          space. The kernel parameter switch_amode=on will enable this feature,

          default is disabled. Enabling this (via kernel parameter) on machines

          earlier than IBM System z9-109 EC/BC will reduce system performance.

          Note that this option will also be selected by selecting the execute

          protection option below. Enabling the execute protection via the

          noexec kernel parameter will also switch the addressing modes,

          independent of the switch_amode kernel parameter.

config S390_EXEC_PROTECT

        bool "Data execute protection"

        select S390_SWITCH_AMODE

        help

          This option allows to enable a buffer overflow protection for user

          space programs and it also selects the addressing mode option above.

          The kernel parameter noexec=on will enable this feature and also

          switch the addressing modes, default is disabled. Enabling this (via

          kernel parameter) on machines earlier than IBM System z9-109 EC/BC

          will reduce system performance.

comment "Code generation options"

choice

        prompt "Processor type"

        default MARCH_G5

config MARCH_G5

        bool "S/390 model G5 and G6"

        depends on !64BIT

        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.

config MARCH_Z9_109

        bool "IBM System z9"

        help

          Select this to enable optimizations for IBM System z9-109, IBM

          System z9 Enterprise Class (z9 EC), and IBM System z9 Business

          Class (z9 BC). The kernel will be slightly faster but will not

          work on older machines such as the z990, z890, z900, and z800.

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 && !LOCKDEP

        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.

config ARCH_POPULATES_NODE_MAP

        def_bool y

comment "Kernel preemption"

source "kernel/Kconfig.preempt"

source "mm/Kconfig"

config HOLES_IN_ZONE

        def_bool y

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

          IBM mainframes.

          For details please refer to the documentation provided by IBM at

          To compile this driver as a module, choose M here: the

          module will be called qdio.

          If unsure, say Y.

config QDIO_DEBUG

        bool "Extended debugging information"

        depends on QDIO

        help

          Say Y here to get extended debugging output in

            /sys/kernel/debug/s390dbf/qdio...

          Warning: this option reduces the performance of the QDIO module.

          If unsure, say N.

comment "Misc"

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.

          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

        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 && 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

        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.

source kernel/Kconfig.hz

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.

config S390_HYPFS_FS

        bool "s390 hypervisor file system support"

        select SYS_HYPERVISOR

        default y

        help

          This is a virtual file system intended to provide accounting

          information in an s390 hypervisor environment.

config KEXEC

        bool "kexec system call"

        help

          kexec is a system call that implements the ability to shutdown your

          current kernel, and to start another kernel.  It is like a reboot

          but is independent of hardware/microcode support.

config ZFCPDUMP

        tristate "zfcpdump support"

        select SMP

        default n

        help

          Select this option if you want to build an zfcpdump enabled kernel.

          Refer to  for more details on this.

endmenu

source "net/Kconfig"

config PCMCIA

        def_bool n

config CCW

        def_bool y

source "drivers/Kconfig"

source "fs/Kconfig"

source "kernel/Kconfig.instrumentation"

source "arch/s390/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"