10 config STACKTRACE_SUPPORT
13 config HAVE_LATENCYTOP_SUPPORT
16 config RWSEM_GENERIC_SPINLOCK
19 config RWSEM_XCHGADD_ALGORITHM
22 config ARCH_HAS_ILOG2_U32
25 config ARCH_HAS_ILOG2_U64
28 config GENERIC_HWEIGHT
31 config GENERIC_TIME_VSYSCALL
34 config GENERIC_CLOCKEVENTS
40 config GENERIC_BUG_RELATIVE_POINTERS
49 config ARCH_DMA_ADDR_T_64BIT
52 config GENERIC_LOCKBREAK
53 def_bool y if SMP && PREEMPT
58 config VIRT_CPU_ACCOUNTING
61 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
66 select USE_GENERIC_SMP_HELPERS if SMP
67 select GENERIC_CPU_DEVICES if !SMP
68 select HAVE_SYSCALL_WRAPPERS
69 select HAVE_FUNCTION_TRACER
70 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
71 select HAVE_FTRACE_MCOUNT_RECORD
72 select HAVE_C_RECORDMCOUNT
73 select HAVE_SYSCALL_TRACEPOINTS
74 select HAVE_DYNAMIC_FTRACE
75 select HAVE_FUNCTION_GRAPH_TRACER
76 select HAVE_REGS_AND_STACK_ACCESS_API
79 select HAVE_KRETPROBES
80 select HAVE_KVM if 64BIT
81 select HAVE_ARCH_TRACEHOOK
82 select INIT_ALL_POSSIBLE
84 select HAVE_PERF_EVENTS
85 select ARCH_HAVE_NMI_SAFE_CMPXCHG
86 select HAVE_KERNEL_GZIP
87 select HAVE_KERNEL_BZIP2
88 select HAVE_KERNEL_LZMA
89 select HAVE_KERNEL_LZO
91 select HAVE_ARCH_MUTEX_CPU_RELAX
92 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
95 select HAVE_MEMBLOCK_NODE_MAP
96 select ARCH_DISCARD_MEMBLOCK
97 select ARCH_INLINE_SPIN_TRYLOCK
98 select ARCH_INLINE_SPIN_TRYLOCK_BH
99 select ARCH_INLINE_SPIN_LOCK
100 select ARCH_INLINE_SPIN_LOCK_BH
101 select ARCH_INLINE_SPIN_LOCK_IRQ
102 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
103 select ARCH_INLINE_SPIN_UNLOCK
104 select ARCH_INLINE_SPIN_UNLOCK_BH
105 select ARCH_INLINE_SPIN_UNLOCK_IRQ
106 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
107 select ARCH_INLINE_READ_TRYLOCK
108 select ARCH_INLINE_READ_LOCK
109 select ARCH_INLINE_READ_LOCK_BH
110 select ARCH_INLINE_READ_LOCK_IRQ
111 select ARCH_INLINE_READ_LOCK_IRQSAVE
112 select ARCH_INLINE_READ_UNLOCK
113 select ARCH_INLINE_READ_UNLOCK_BH
114 select ARCH_INLINE_READ_UNLOCK_IRQ
115 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
116 select ARCH_INLINE_WRITE_TRYLOCK
117 select ARCH_INLINE_WRITE_LOCK
118 select ARCH_INLINE_WRITE_LOCK_BH
119 select ARCH_INLINE_WRITE_LOCK_IRQ
120 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
121 select ARCH_INLINE_WRITE_UNLOCK
122 select ARCH_INLINE_WRITE_UNLOCK_BH
123 select ARCH_INLINE_WRITE_UNLOCK_IRQ
124 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
125 select GENERIC_SMP_IDLE_THREAD
127 config SCHED_OMIT_FRAME_POINTER
130 source "init/Kconfig"
132 source "kernel/Kconfig.freezer"
136 comment "Processor type and features"
138 source "kernel/time/Kconfig"
142 prompt "64 bit kernel"
144 Select this option if you have an IBM z/Architecture machine
145 and want to use the 64 bit addressing mode.
155 prompt "Symmetric multi-processing support"
157 This enables support for systems with more than one CPU. If you have
158 a system with only one CPU, like most personal computers, say N. If
159 you have a system with more than one CPU, say Y.
161 If you say N here, the kernel will run on single and multiprocessor
162 machines, but will use only one CPU of a multiprocessor machine. If
163 you say Y here, the kernel will run on many, but not all,
164 singleprocessor machines. On a singleprocessor machine, the kernel
165 will run faster if you say N here.
167 See also the SMP-HOWTO available at
168 <http://www.tldp.org/docs.html#howto>.
170 Even if you don't know what to do here, say Y.
173 int "Maximum number of CPUs (2-64)"
176 default "32" if !64BIT
177 default "64" if 64BIT
179 This allows you to specify the maximum number of CPUs which this
180 kernel will support. The maximum supported value is 64 and the
181 minimum value which makes sense is 2.
183 This is purely to save memory - each supported CPU adds
184 approximately sixteen kilobytes to the kernel image.
188 prompt "Support for hot-pluggable CPUs"
192 Say Y here to be able to turn CPUs off and on. CPUs
193 can be controlled through /sys/devices/system/cpu/cpu#.
194 Say N if you want to disable CPU hotplug.
201 prompt "Book scheduler support"
205 Book scheduler support improves the CPU scheduler's decision making
206 when dealing with machines that have several books.
210 prompt "IEEE FPU emulation"
213 This option is required for IEEE compliant floating point arithmetic
214 on older ESA/390 machines. Say Y unless you know your machine doesn't
219 prompt "Kernel support for 31 bit emulation"
221 select COMPAT_BINFMT_ELF if BINFMT_ELF
222 select ARCH_WANT_OLD_COMPAT_IPC
224 Select this option if you want to enable your system kernel to
225 handle system-calls from ELF binaries for 31 bit ESA. This option
226 (and some other stuff like libraries and such) is needed for
227 executing 31 bit applications. It is safe to say "Y".
229 config SYSVIPC_COMPAT
230 def_bool y if COMPAT && SYSVIPC
233 def_bool y if COMPAT && KEYS
238 config HAVE_MARCH_Z900_FEATURES
241 config HAVE_MARCH_Z990_FEATURES
243 select HAVE_MARCH_Z900_FEATURES
245 config HAVE_MARCH_Z9_109_FEATURES
247 select HAVE_MARCH_Z990_FEATURES
249 config HAVE_MARCH_Z10_FEATURES
251 select HAVE_MARCH_Z9_109_FEATURES
253 config HAVE_MARCH_Z196_FEATURES
255 select HAVE_MARCH_Z10_FEATURES
257 comment "Code generation options"
260 prompt "Processor type"
264 bool "System/390 model G5 and G6"
267 Select this to build a 31 bit kernel that works
268 on all ESA/390 and z/Architecture machines.
271 bool "IBM zSeries model z800 and z900"
272 select HAVE_MARCH_Z900_FEATURES if 64BIT
274 Select this to enable optimizations for model z800/z900 (2064 and
275 2066 series). This will enable some optimizations that are not
276 available on older ESA/390 (31 Bit) only CPUs.
279 bool "IBM zSeries model z890 and z990"
280 select HAVE_MARCH_Z990_FEATURES if 64BIT
282 Select this to enable optimizations for model z890/z990 (2084 and
283 2086 series). The kernel will be slightly faster but will not work
288 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
290 Select this to enable optimizations for IBM System z9 (2094 and
291 2096 series). The kernel will be slightly faster but will not work
295 bool "IBM System z10"
296 select HAVE_MARCH_Z10_FEATURES if 64BIT
298 Select this to enable optimizations for IBM System z10 (2097 and
299 2098 series). The kernel will be slightly faster but will not work
303 bool "IBM zEnterprise 114 and 196"
304 select HAVE_MARCH_Z196_FEATURES if 64BIT
306 Select this to enable optimizations for IBM zEnterprise 114 and 196
307 (2818 and 2817 series). The kernel will be slightly faster but will
308 not work on older machines.
314 prompt "Pack kernel stack"
316 This option enables the compiler option -mkernel-backchain if it
317 is available. If the option is available the compiler supports
318 the new stack layout which dramatically reduces the minimum stack
319 frame size. With an old compiler a non-leaf function needs a
320 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
321 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
322 and 24 byte on 64 bit.
324 Say Y if you are unsure.
328 prompt "Use 8kb for kernel stack instead of 16kb"
329 depends on PACK_STACK && 64BIT && !LOCKDEP
331 If you say Y here and the compiler supports the -mkernel-backchain
332 option the kernel will use a smaller kernel stack size. The reduced
333 size is 8kb instead of 16kb. This allows to run more threads on a
334 system and reduces the pressure on the memory management for higher
335 order page allocations.
337 Say N if you are unsure.
341 prompt "Detect kernel stack overflow"
343 This option enables the compiler option -mstack-guard and
344 -mstack-size if they are available. If the compiler supports them
345 it will emit additional code to each function prolog to trigger
346 an illegal operation if the kernel stack is about to overflow.
348 Say N if you are unsure.
351 int "Size of the guard area (128-1024)"
353 depends on CHECK_STACK
356 This allows you to specify the size of the guard area at the lower
357 end of the kernel stack. If the kernel stack points into the guard
358 area on function entry an illegal operation is triggered. The size
359 needs to be a power of 2. Please keep in mind that the size of an
360 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
361 The minimum size for the stack guard should be 256 for 31 bit and
364 config WARN_DYNAMIC_STACK
366 prompt "Emit compiler warnings for function with dynamic stack usage"
368 This option enables the compiler option -mwarn-dynamicstack. If the
369 compiler supports this options generates warnings for functions
370 that dynamically allocate stack space using alloca.
372 Say N if you are unsure.
374 comment "Kernel preemption"
376 source "kernel/Kconfig.preempt"
378 config ARCH_SPARSEMEM_ENABLE
380 select SPARSEMEM_VMEMMAP_ENABLE
381 select SPARSEMEM_VMEMMAP
382 select SPARSEMEM_STATIC if !64BIT
384 config ARCH_SPARSEMEM_DEFAULT
387 config ARCH_SELECT_MEMORY_MODEL
390 config ARCH_ENABLE_MEMORY_HOTPLUG
391 def_bool y if SPARSEMEM
393 config ARCH_ENABLE_MEMORY_HOTREMOVE
396 config ARCH_HIBERNATION_POSSIBLE
401 comment "I/O subsystem configuration"
405 prompt "QDIO support"
407 This driver provides the Queued Direct I/O base support for
410 To compile this driver as a module, choose M here: the
411 module will be called qdio.
417 prompt "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.
434 source "fs/Kconfig.binfmt"
436 config FORCE_MAX_ZONEORDER
442 prompt "Pseudo page fault support"
444 Select this option, if you want to use PFAULT pseudo page fault
445 handling under VM. If running native or in LPAR, this option
446 has no effect. If your VM does not support PFAULT, PAGEEX
447 pseudo page fault handling will be used.
448 Note that VM 4.2 supports PFAULT but has a bug in its
449 implementation that causes some problems.
450 Everybody who wants to run Linux under VM != VM4.2 should select
455 prompt "VM shared kernel support"
457 Select this option, if you want to share the text segment of the
458 Linux kernel between different VM guests. This reduces memory
459 usage with lots of guests but greatly increases kernel size.
460 Also if a kernel was IPL'ed from a shared segment the kexec system
462 You should only select this option if you know what you are
463 doing and want to exploit this feature.
467 prompt "Cooperative memory management"
469 Select this option, if you want to enable the kernel interface
470 to reduce the memory size of the system. This is accomplished
471 by allocating pages of memory and put them "on hold". This only
472 makes sense for a system running under VM where the unused pages
473 will be reused by VM for other guest systems. The interface
474 allows an external monitor to balance memory of many systems.
475 Everybody who wants to run Linux under VM should select this
480 prompt "IUCV special message interface to cooperative memory management"
481 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
483 Select this option to enable the special message interface to
484 the cooperative memory management.
488 prompt "Linux - VM Monitor Stream, base infrastructure"
491 This provides a kernel interface for creating and updating z/VM APPLDATA
492 monitor records. The monitor records are updated at certain time
493 intervals, once the timer is started.
494 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
495 i.e. enables or disables monitoring on the Linux side.
496 A custom interval value (in seconds) can be written to
497 /proc/appldata/interval.
499 Defaults are 60 seconds interval and timer off.
500 The /proc entries can also be read from, showing the current settings.
504 prompt "Monitor memory management statistics"
505 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
507 This provides memory management related data to the Linux - VM Monitor
508 Stream, like paging/swapping rate, memory utilisation, etc.
509 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
510 APPLDATA monitor record, i.e. enables or disables monitoring this record
514 The /proc entry can also be read from, showing the current settings.
516 This can also be compiled as a module, which will be called
521 prompt "Monitor OS statistics"
522 depends on APPLDATA_BASE
524 This provides OS related data to the Linux - VM Monitor Stream, like
525 CPU utilisation, etc.
526 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
527 APPLDATA monitor record, i.e. enables or disables monitoring this record
531 This can also be compiled as a module, which will be called
534 config APPLDATA_NET_SUM
536 prompt "Monitor overall network statistics"
537 depends on APPLDATA_BASE && NET
539 This provides network related data to the Linux - VM Monitor Stream,
540 currently there is only a total sum of network I/O statistics, no
542 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
543 APPLDATA monitor record, i.e. enables or disables monitoring this record
547 This can also be compiled as a module, which will be called
550 source kernel/Kconfig.hz
554 prompt "s390 hypervisor file system support"
555 select SYS_HYPERVISOR
557 This is a virtual file system intended to provide accounting
558 information in an s390 hypervisor environment.
562 prompt "kexec system call"
564 kexec is a system call that implements the ability to shutdown your
565 current kernel, and to start another kernel. It is like a reboot
566 but is independent of hardware/microcode support.
569 bool "kernel crash dumps"
570 depends on 64BIT && SMP
573 Generate crash dump after being started by kexec.
574 Crash dump kernels are loaded in the main kernel with kexec-tools
575 into a specially reserved region and then later executed after
576 a crash by kdump/kexec.
577 For more details see Documentation/kdump/kdump.txt
581 prompt "zfcpdump support"
584 Select this option if you want to build an zfcpdump enabled kernel.
585 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
589 prompt "s390 guest support for KVM (EXPERIMENTAL)"
590 depends on 64BIT && EXPERIMENTAL
591 select VIRTUALIZATION
594 select VIRTIO_CONSOLE
596 Select this option if you want to run the kernel as a guest under
597 the KVM hypervisor. This will add detection for KVM as well as a
598 virtio transport. If KVM is detected, the virtio console will be
603 prompt "Enable seccomp to safely compute untrusted bytecode"
606 This kernel feature is useful for number crunching applications
607 that may need to compute untrusted bytecode during their
608 execution. By using pipes or other transports made available to
609 the process as file descriptors supporting the read/write
610 syscalls, it's possible to isolate those applications in
611 their own address space using seccomp. Once seccomp is
612 enabled via /proc/<pid>/seccomp, it cannot be disabled
613 and the task is only allowed to execute a few safe syscalls
614 defined by each seccomp mode.
620 menu "Power Management"
622 source "kernel/power/Kconfig"
634 source "drivers/Kconfig"
638 source "arch/s390/Kconfig.debug"
640 source "security/Kconfig"
642 source "crypto/Kconfig"
646 source "arch/s390/kvm/Kconfig"