12 config LOCKDEP_SUPPORT
15 config STACKTRACE_SUPPORT
18 config HAVE_LATENCYTOP_SUPPORT
21 config RWSEM_GENERIC_SPINLOCK
24 config RWSEM_XCHGADD_ALGORITHM
27 config ARCH_HAS_ILOG2_U32
31 config ARCH_HAS_ILOG2_U64
35 config GENERIC_HWEIGHT
38 config GENERIC_TIME_VSYSCALL
41 config GENERIC_CLOCKEVENTS
49 config GENERIC_BUG_RELATIVE_POINTERS
58 config ARCH_DMA_ADDR_T_64BIT
61 config GENERIC_LOCKBREAK
64 depends on SMP && PREEMPT
70 config VIRT_CPU_ACCOUNTING
73 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
78 select USE_GENERIC_SMP_HELPERS if SMP
79 select HAVE_SYSCALL_WRAPPERS
80 select HAVE_FUNCTION_TRACER
81 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
82 select HAVE_FTRACE_MCOUNT_RECORD
83 select HAVE_C_RECORDMCOUNT
84 select HAVE_SYSCALL_TRACEPOINTS
85 select HAVE_DYNAMIC_FTRACE
86 select HAVE_FUNCTION_GRAPH_TRACER
87 select HAVE_REGS_AND_STACK_ACCESS_API
88 select HAVE_DEFAULT_NO_SPIN_MUTEXES
91 select HAVE_KRETPROBES
92 select HAVE_KVM if 64BIT
93 select HAVE_ARCH_TRACEHOOK
94 select INIT_ALL_POSSIBLE
96 select HAVE_PERF_EVENTS
97 select HAVE_KERNEL_GZIP
98 select HAVE_KERNEL_BZIP2
99 select HAVE_KERNEL_LZMA
100 select HAVE_KERNEL_LZO
101 select HAVE_GET_USER_PAGES_FAST
102 select HAVE_ARCH_MUTEX_CPU_RELAX
103 select ARCH_INLINE_SPIN_TRYLOCK
104 select ARCH_INLINE_SPIN_TRYLOCK_BH
105 select ARCH_INLINE_SPIN_LOCK
106 select ARCH_INLINE_SPIN_LOCK_BH
107 select ARCH_INLINE_SPIN_LOCK_IRQ
108 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
109 select ARCH_INLINE_SPIN_UNLOCK
110 select ARCH_INLINE_SPIN_UNLOCK_BH
111 select ARCH_INLINE_SPIN_UNLOCK_IRQ
112 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_READ_TRYLOCK
114 select ARCH_INLINE_READ_LOCK
115 select ARCH_INLINE_READ_LOCK_BH
116 select ARCH_INLINE_READ_LOCK_IRQ
117 select ARCH_INLINE_READ_LOCK_IRQSAVE
118 select ARCH_INLINE_READ_UNLOCK
119 select ARCH_INLINE_READ_UNLOCK_BH
120 select ARCH_INLINE_READ_UNLOCK_IRQ
121 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
122 select ARCH_INLINE_WRITE_TRYLOCK
123 select ARCH_INLINE_WRITE_LOCK
124 select ARCH_INLINE_WRITE_LOCK_BH
125 select ARCH_INLINE_WRITE_LOCK_IRQ
126 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
127 select ARCH_INLINE_WRITE_UNLOCK
128 select ARCH_INLINE_WRITE_UNLOCK_BH
129 select ARCH_INLINE_WRITE_UNLOCK_IRQ
130 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
132 config SCHED_OMIT_FRAME_POINTER
136 source "init/Kconfig"
138 source "kernel/Kconfig.freezer"
142 comment "Processor type and features"
144 source "kernel/time/Kconfig"
149 Select this option if you have an IBM z/Architecture machine
150 and want to use the 64 bit addressing mode.
160 bool "Symmetric multi-processing support"
162 This enables support for systems with more than one CPU. If you have
163 a system with only one CPU, like most personal computers, say N. If
164 you have a system with more than one CPU, say Y.
166 If you say N here, the kernel will run on single and multiprocessor
167 machines, but will use only one CPU of a multiprocessor machine. If
168 you say Y here, the kernel will run on many, but not all,
169 singleprocessor machines. On a singleprocessor machine, the kernel
170 will run faster if you say N here.
172 See also the SMP-HOWTO available at
173 <http://www.tldp.org/docs.html#howto>.
175 Even if you don't know what to do here, say Y.
178 int "Maximum number of CPUs (2-64)"
181 default "32" if !64BIT
182 default "64" if 64BIT
184 This allows you to specify the maximum number of CPUs which this
185 kernel will support. The maximum supported value is 64 and the
186 minimum value which makes sense is 2.
188 This is purely to save memory - each supported CPU adds
189 approximately sixteen kilobytes to the kernel image.
192 bool "Support for hot-pluggable CPUs"
197 Say Y here to be able to turn CPUs off and on. CPUs
198 can be controlled through /sys/devices/system/cpu/cpu#.
199 Say N if you want to disable CPU hotplug.
203 prompt "Multi-core scheduler support"
206 Multi-core scheduler support improves the CPU scheduler's decision
207 making when dealing with multi-core CPU chips at a cost of slightly
208 increased overhead in some places.
211 bool "Book scheduler support"
212 depends on SMP && SCHED_MC
214 Book scheduler support improves the CPU scheduler's decision making
215 when dealing with machines that have several books.
218 bool "IEEE FPU emulation"
221 This option is required for IEEE compliant floating point arithmetic
222 on older ESA/390 machines. Say Y unless you know your machine doesn't
226 bool "Kernel support for 31 bit emulation"
228 select COMPAT_BINFMT_ELF
230 Select this option if you want to enable your system kernel to
231 handle system-calls from ELF binaries for 31 bit ESA. This option
232 (and some other stuff like libraries and such) is needed for
233 executing 31 bit applications. It is safe to say "Y".
235 config SYSVIPC_COMPAT
237 depends on COMPAT && SYSVIPC
244 config S390_EXEC_PROTECT
245 bool "Data execute protection"
247 This option allows to enable a buffer overflow protection for user
248 space programs and it also selects the addressing mode option above.
249 The kernel parameter noexec=on will enable this feature and also
250 switch the addressing modes, default is disabled. Enabling this (via
251 kernel parameter) on machines earlier than IBM System z9 this will
252 reduce system performance.
254 comment "Code generation options"
257 prompt "Processor type"
261 bool "System/390 model G5 and G6"
264 Select this to build a 31 bit kernel that works
265 on all ESA/390 and z/Architecture machines.
268 bool "IBM zSeries model z800 and z900"
270 Select this to enable optimizations for model z800/z900 (2064 and
271 2066 series). This will enable some optimizations that are not
272 available on older ESA/390 (31 Bit) only CPUs.
275 bool "IBM zSeries model z890 and z990"
277 Select this to enable optimizations for model z890/z990 (2084 and
278 2086 series). The kernel will be slightly faster but will not work
284 Select this to enable optimizations for IBM System z9 (2094 and
285 2096 series). The kernel will be slightly faster but will not work
289 bool "IBM System z10"
291 Select this to enable optimizations for IBM System z10 (2097 and
292 2098 series). The kernel will be slightly faster but will not work
296 bool "IBM zEnterprise 196"
298 Select this to enable optimizations for IBM zEnterprise 196
299 (2817 series). The kernel will be slightly faster but will not work
305 bool "Pack kernel stack"
307 This option enables the compiler option -mkernel-backchain if it
308 is available. If the option is available the compiler supports
309 the new stack layout which dramatically reduces the minimum stack
310 frame size. With an old compiler a non-leaf function needs a
311 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
312 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
313 and 24 byte on 64 bit.
315 Say Y if you are unsure.
318 bool "Use 8kb for kernel stack instead of 16kb"
319 depends on PACK_STACK && 64BIT && !LOCKDEP
321 If you say Y here and the compiler supports the -mkernel-backchain
322 option the kernel will use a smaller kernel stack size. The reduced
323 size is 8kb instead of 16kb. This allows to run more threads on a
324 system and reduces the pressure on the memory management for higher
325 order page allocations.
327 Say N if you are unsure.
330 bool "Detect kernel stack overflow"
332 This option enables the compiler option -mstack-guard and
333 -mstack-size if they are available. If the compiler supports them
334 it will emit additional code to each function prolog to trigger
335 an illegal operation if the kernel stack is about to overflow.
337 Say N if you are unsure.
340 int "Size of the guard area (128-1024)"
342 depends on CHECK_STACK
345 This allows you to specify the size of the guard area at the lower
346 end of the kernel stack. If the kernel stack points into the guard
347 area on function entry an illegal operation is triggered. The size
348 needs to be a power of 2. Please keep in mind that the size of an
349 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
350 The minimum size for the stack guard should be 256 for 31 bit and
354 bool "Emit compiler warnings for function with broken stack usage"
356 This option enables the compiler options -mwarn-framesize and
357 -mwarn-dynamicstack. If the compiler supports these options it
358 will generate warnings for function which either use alloca or
359 create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
361 Say N if you are unsure.
363 config WARN_STACK_SIZE
364 int "Maximum frame size considered safe (128-2048)"
366 depends on WARN_STACK
369 This allows you to specify the maximum frame size a function may
370 have without the compiler complaining about it.
372 config ARCH_POPULATES_NODE_MAP
375 comment "Kernel preemption"
377 source "kernel/Kconfig.preempt"
379 config ARCH_SPARSEMEM_ENABLE
381 select SPARSEMEM_VMEMMAP_ENABLE
382 select SPARSEMEM_VMEMMAP
383 select SPARSEMEM_STATIC if !64BIT
385 config ARCH_SPARSEMEM_DEFAULT
388 config ARCH_SELECT_MEMORY_MODEL
391 config ARCH_ENABLE_MEMORY_HOTPLUG
395 config ARCH_ENABLE_MEMORY_HOTREMOVE
398 config ARCH_HIBERNATION_POSSIBLE
403 comment "I/O subsystem configuration"
406 tristate "QDIO support"
408 This driver provides the Queued Direct I/O base support for
411 To compile this driver as a module, choose M here: the
412 module will be called qdio.
417 tristate "Support for CHSC subchannels"
419 This driver allows usage of CHSC subchannels. A CHSC subchannel
420 is usually present on LPAR only.
421 The driver creates a device /dev/chsc, which may be used to
422 obtain I/O configuration information about the machine and
423 to issue asynchronous chsc commands (DANGEROUS).
424 You will usually only want to use this interface on a special
425 LPAR designated for system management.
427 To compile this driver as a module, choose M here: the
428 module will be called chsc_sch.
435 bool "Builtin IPL record support"
437 If you want to use the produced kernel to IPL directly from a
438 device, you have to merge a bootsector specific to the device
439 into the first bytes of the kernel. You will have to select the
443 prompt "IPL method generated into head.S"
447 Select "tape" if you want to IPL the image from a Tape.
449 Select "vm_reader" if you are running under VM/ESA and want
450 to IPL the image from the emulated card reader.
460 source "fs/Kconfig.binfmt"
462 config FORCE_MAX_ZONEORDER
467 bool "Pseudo page fault support"
469 Select this option, if you want to use PFAULT pseudo page fault
470 handling under VM. If running native or in LPAR, this option
471 has no effect. If your VM does not support PFAULT, PAGEEX
472 pseudo page fault handling will be used.
473 Note that VM 4.2 supports PFAULT but has a bug in its
474 implementation that causes some problems.
475 Everybody who wants to run Linux under VM != VM4.2 should select
479 bool "VM shared kernel support"
481 Select this option, if you want to share the text segment of the
482 Linux kernel between different VM guests. This reduces memory
483 usage with lots of guests but greatly increases kernel size.
484 Also if a kernel was IPL'ed from a shared segment the kexec system
486 You should only select this option if you know what you are
487 doing and want to exploit this feature.
490 tristate "Cooperative memory management"
492 Select this option, if you want to enable the kernel interface
493 to reduce the memory size of the system. This is accomplished
494 by allocating pages of memory and put them "on hold". This only
495 makes sense for a system running under VM where the unused pages
496 will be reused by VM for other guest systems. The interface
497 allows an external monitor to balance memory of many systems.
498 Everybody who wants to run Linux under VM should select this
502 bool "IUCV special message interface to cooperative memory management"
503 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
505 Select this option to enable the special message interface to
506 the cooperative memory management.
509 bool "Linux - VM Monitor Stream, base infrastructure"
512 This provides a kernel interface for creating and updating z/VM APPLDATA
513 monitor records. The monitor records are updated at certain time
514 intervals, once the timer is started.
515 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
516 i.e. enables or disables monitoring on the Linux side.
517 A custom interval value (in seconds) can be written to
518 /proc/appldata/interval.
520 Defaults are 60 seconds interval and timer off.
521 The /proc entries can also be read from, showing the current settings.
524 tristate "Monitor memory management statistics"
525 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
527 This provides memory management related data to the Linux - VM Monitor
528 Stream, like paging/swapping rate, memory utilisation, etc.
529 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
530 APPLDATA monitor record, i.e. enables or disables monitoring this record
534 The /proc entry can also be read from, showing the current settings.
536 This can also be compiled as a module, which will be called
540 tristate "Monitor OS statistics"
541 depends on APPLDATA_BASE
543 This provides OS related data to the Linux - VM Monitor Stream, like
544 CPU utilisation, etc.
545 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
546 APPLDATA monitor record, i.e. enables or disables monitoring this record
550 This can also be compiled as a module, which will be called
553 config APPLDATA_NET_SUM
554 tristate "Monitor overall network statistics"
555 depends on APPLDATA_BASE && NET
557 This provides network related data to the Linux - VM Monitor Stream,
558 currently there is only a total sum of network I/O statistics, no
560 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
561 APPLDATA monitor record, i.e. enables or disables monitoring this record
565 This can also be compiled as a module, which will be called
568 source kernel/Kconfig.hz
571 bool "s390 hypervisor file system support"
572 select SYS_HYPERVISOR
575 This is a virtual file system intended to provide accounting
576 information in an s390 hypervisor environment.
579 bool "kexec system call"
581 kexec is a system call that implements the ability to shutdown your
582 current kernel, and to start another kernel. It is like a reboot
583 but is independent of hardware/microcode support.
586 bool "zfcpdump support"
590 Select this option if you want to build an zfcpdump enabled kernel.
591 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
594 bool "s390 guest support for KVM (EXPERIMENTAL)"
595 depends on 64BIT && EXPERIMENTAL
598 select VIRTIO_CONSOLE
600 Select this option if you want to run the kernel as a guest under
601 the KVM hypervisor. This will add detection for KVM as well as a
602 virtio transport. If KVM is detected, the virtio console will be
606 bool "Enable seccomp to safely compute untrusted bytecode"
610 This kernel feature is useful for number crunching applications
611 that may need to compute untrusted bytecode during their
612 execution. By using pipes or other transports made available to
613 the process as file descriptors supporting the read/write
614 syscalls, it's possible to isolate those applications in
615 their own address space using seccomp. Once seccomp is
616 enabled via /proc/<pid>/seccomp, it cannot be disabled
617 and the task is only allowed to execute a few safe syscalls
618 defined by each seccomp mode.
624 menu "Power Management"
626 source "kernel/power/Kconfig"
638 source "drivers/Kconfig"
642 source "arch/s390/Kconfig.debug"
644 source "security/Kconfig"
646 source "crypto/Kconfig"
650 source "arch/s390/kvm/Kconfig"