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Diffstat (limited to 'arch/s390/Kconfig')
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diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig new file mode 100644 index 000000000000..ab79af84699a --- /dev/null +++ b/arch/s390/Kconfig @@ -0,0 +1,480 @@ +# +# 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" |