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
34 config GENERIC_BUG_RELATIVE_POINTERS
43 config ARCH_DMA_ADDR_T_64BIT
46 config GENERIC_LOCKBREAK
47 def_bool y if SMP && PREEMPT
52 config VIRT_CPU_ACCOUNTING
55 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
60 select USE_GENERIC_SMP_HELPERS if SMP
61 select GENERIC_CPU_DEVICES if !SMP
62 select HAVE_SYSCALL_WRAPPERS
63 select HAVE_FUNCTION_TRACER
64 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
65 select HAVE_FTRACE_MCOUNT_RECORD
66 select HAVE_C_RECORDMCOUNT
67 select HAVE_SYSCALL_TRACEPOINTS
68 select HAVE_DYNAMIC_FTRACE
69 select HAVE_FUNCTION_GRAPH_TRACER
70 select HAVE_REGS_AND_STACK_ACCESS_API
73 select HAVE_KRETPROBES
74 select HAVE_KVM if 64BIT
75 select HAVE_ARCH_TRACEHOOK
76 select INIT_ALL_POSSIBLE
78 select HAVE_PERF_EVENTS
79 select ARCH_HAVE_NMI_SAFE_CMPXCHG
80 select HAVE_KERNEL_GZIP
81 select HAVE_KERNEL_BZIP2
82 select HAVE_KERNEL_LZMA
83 select HAVE_KERNEL_LZO
85 select HAVE_ARCH_MUTEX_CPU_RELAX
86 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
87 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
88 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
90 select HAVE_MEMBLOCK_NODE_MAP
91 select HAVE_CMPXCHG_LOCAL
92 select ARCH_DISCARD_MEMBLOCK
93 select BUILDTIME_EXTABLE_SORT
94 select ARCH_INLINE_SPIN_TRYLOCK
95 select ARCH_INLINE_SPIN_TRYLOCK_BH
96 select ARCH_INLINE_SPIN_LOCK
97 select ARCH_INLINE_SPIN_LOCK_BH
98 select ARCH_INLINE_SPIN_LOCK_IRQ
99 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
100 select ARCH_INLINE_SPIN_UNLOCK
101 select ARCH_INLINE_SPIN_UNLOCK_BH
102 select ARCH_INLINE_SPIN_UNLOCK_IRQ
103 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
104 select ARCH_INLINE_READ_TRYLOCK
105 select ARCH_INLINE_READ_LOCK
106 select ARCH_INLINE_READ_LOCK_BH
107 select ARCH_INLINE_READ_LOCK_IRQ
108 select ARCH_INLINE_READ_LOCK_IRQSAVE
109 select ARCH_INLINE_READ_UNLOCK
110 select ARCH_INLINE_READ_UNLOCK_BH
111 select ARCH_INLINE_READ_UNLOCK_IRQ
112 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_WRITE_TRYLOCK
114 select ARCH_INLINE_WRITE_LOCK
115 select ARCH_INLINE_WRITE_LOCK_BH
116 select ARCH_INLINE_WRITE_LOCK_IRQ
117 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
118 select ARCH_INLINE_WRITE_UNLOCK
119 select ARCH_INLINE_WRITE_UNLOCK_BH
120 select ARCH_INLINE_WRITE_UNLOCK_IRQ
121 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
122 select ARCH_WANT_IPC_PARSE_VERSION
123 select GENERIC_SMP_IDLE_THREAD
124 select GENERIC_TIME_VSYSCALL
125 select GENERIC_CLOCKEVENTS
126 select KTIME_SCALAR if 32BIT
127 select HAVE_ARCH_SECCOMP_FILTER
129 config SCHED_OMIT_FRAME_POINTER
132 source "init/Kconfig"
134 source "kernel/Kconfig.freezer"
138 comment "Processor type and features"
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.
152 prompt "Symmetric multi-processing support"
154 This enables support for systems with more than one CPU. If you have
155 a system with only one CPU, like most personal computers, say N. If
156 you have a system with more than one CPU, say Y.
158 If you say N here, the kernel will run on single and multiprocessor
159 machines, but will use only one CPU of a multiprocessor machine. If
160 you say Y here, the kernel will run on many, but not all,
161 singleprocessor machines. On a singleprocessor machine, the kernel
162 will run faster if you say N here.
164 See also the SMP-HOWTO available at
165 <http://www.tldp.org/docs.html#howto>.
167 Even if you don't know what to do here, say Y.
170 int "Maximum number of CPUs (2-64)"
173 default "32" if !64BIT
174 default "64" if 64BIT
176 This allows you to specify the maximum number of CPUs which this
177 kernel will support. The maximum supported value is 64 and the
178 minimum value which makes sense is 2.
180 This is purely to save memory - each supported CPU adds
181 approximately sixteen kilobytes to the kernel image.
185 prompt "Support for hot-pluggable CPUs"
189 Say Y here to be able to turn CPUs off and on. CPUs
190 can be controlled through /sys/devices/system/cpu/cpu#.
191 Say N if you want to disable CPU hotplug.
198 prompt "Book scheduler support"
202 Book scheduler support improves the CPU scheduler's decision making
203 when dealing with machines that have several books.
207 prompt "IEEE FPU emulation"
210 This option is required for IEEE compliant floating point arithmetic
211 on older ESA/390 machines. Say Y unless you know your machine doesn't
216 prompt "Kernel support for 31 bit emulation"
218 select COMPAT_BINFMT_ELF if BINFMT_ELF
219 select ARCH_WANT_OLD_COMPAT_IPC
221 Select this option if you want to enable your system kernel to
222 handle system-calls from ELF binaries for 31 bit ESA. This option
223 (and some other stuff like libraries and such) is needed for
224 executing 31 bit applications. It is safe to say "Y".
226 config SYSVIPC_COMPAT
227 def_bool y if COMPAT && SYSVIPC
230 def_bool y if COMPAT && KEYS
235 config HAVE_MARCH_Z900_FEATURES
238 config HAVE_MARCH_Z990_FEATURES
240 select HAVE_MARCH_Z900_FEATURES
242 config HAVE_MARCH_Z9_109_FEATURES
244 select HAVE_MARCH_Z990_FEATURES
246 config HAVE_MARCH_Z10_FEATURES
248 select HAVE_MARCH_Z9_109_FEATURES
250 config HAVE_MARCH_Z196_FEATURES
252 select HAVE_MARCH_Z10_FEATURES
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"
269 select HAVE_MARCH_Z900_FEATURES if 64BIT
271 Select this to enable optimizations for model z800/z900 (2064 and
272 2066 series). This will enable some optimizations that are not
273 available on older ESA/390 (31 Bit) only CPUs.
276 bool "IBM zSeries model z890 and z990"
277 select HAVE_MARCH_Z990_FEATURES if 64BIT
279 Select this to enable optimizations for model z890/z990 (2084 and
280 2086 series). The kernel will be slightly faster but will not work
285 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
287 Select this to enable optimizations for IBM System z9 (2094 and
288 2096 series). The kernel will be slightly faster but will not work
292 bool "IBM System z10"
293 select HAVE_MARCH_Z10_FEATURES if 64BIT
295 Select this to enable optimizations for IBM System z10 (2097 and
296 2098 series). The kernel will be slightly faster but will not work
300 bool "IBM zEnterprise 114 and 196"
301 select HAVE_MARCH_Z196_FEATURES if 64BIT
303 Select this to enable optimizations for IBM zEnterprise 114 and 196
304 (2818 and 2817 series). The kernel will be slightly faster but will
305 not work on older machines.
311 prompt "Pack kernel stack"
313 This option enables the compiler option -mkernel-backchain if it
314 is available. If the option is available the compiler supports
315 the new stack layout which dramatically reduces the minimum stack
316 frame size. With an old compiler a non-leaf function needs a
317 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
318 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
319 and 24 byte on 64 bit.
321 Say Y if you are unsure.
325 prompt "Use 8kb for kernel stack instead of 16kb"
326 depends on PACK_STACK && 64BIT && !LOCKDEP
328 If you say Y here and the compiler supports the -mkernel-backchain
329 option the kernel will use a smaller kernel stack size. The reduced
330 size is 8kb instead of 16kb. This allows to run more threads on a
331 system and reduces the pressure on the memory management for higher
332 order page allocations.
334 Say N if you are unsure.
338 prompt "Detect kernel stack overflow"
340 This option enables the compiler option -mstack-guard and
341 -mstack-size if they are available. If the compiler supports them
342 it will emit additional code to each function prolog to trigger
343 an illegal operation if the kernel stack is about to overflow.
345 Say N if you are unsure.
348 int "Size of the guard area (128-1024)"
350 depends on CHECK_STACK
353 This allows you to specify the size of the guard area at the lower
354 end of the kernel stack. If the kernel stack points into the guard
355 area on function entry an illegal operation is triggered. The size
356 needs to be a power of 2. Please keep in mind that the size of an
357 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
358 The minimum size for the stack guard should be 256 for 31 bit and
361 config WARN_DYNAMIC_STACK
363 prompt "Emit compiler warnings for function with dynamic stack usage"
365 This option enables the compiler option -mwarn-dynamicstack. If the
366 compiler supports this options generates warnings for functions
367 that dynamically allocate stack space using alloca.
369 Say N if you are unsure.
371 comment "Kernel preemption"
373 source "kernel/Kconfig.preempt"
375 config ARCH_SPARSEMEM_ENABLE
377 select SPARSEMEM_VMEMMAP_ENABLE
378 select SPARSEMEM_VMEMMAP
379 select SPARSEMEM_STATIC if !64BIT
381 config ARCH_SPARSEMEM_DEFAULT
384 config ARCH_SELECT_MEMORY_MODEL
387 config ARCH_ENABLE_MEMORY_HOTPLUG
388 def_bool y if SPARSEMEM
390 config ARCH_ENABLE_MEMORY_HOTREMOVE
393 config ARCH_HIBERNATION_POSSIBLE
398 comment "I/O subsystem configuration"
402 prompt "QDIO support"
404 This driver provides the Queued Direct I/O base support for
407 To compile this driver as a module, choose M here: the
408 module will be called qdio.
414 prompt "Support for CHSC subchannels"
416 This driver allows usage of CHSC subchannels. A CHSC subchannel
417 is usually present on LPAR only.
418 The driver creates a device /dev/chsc, which may be used to
419 obtain I/O configuration information about the machine and
420 to issue asynchronous chsc commands (DANGEROUS).
421 You will usually only want to use this interface on a special
422 LPAR designated for system management.
424 To compile this driver as a module, choose M here: the
425 module will be called chsc_sch.
431 source "fs/Kconfig.binfmt"
433 config FORCE_MAX_ZONEORDER
439 prompt "Pseudo page fault support"
441 Select this option, if you want to use PFAULT pseudo page fault
442 handling under VM. If running native or in LPAR, this option
443 has no effect. If your VM does not support PFAULT, PAGEEX
444 pseudo page fault handling will be used.
445 Note that VM 4.2 supports PFAULT but has a bug in its
446 implementation that causes some problems.
447 Everybody who wants to run Linux under VM != VM4.2 should select
452 prompt "VM shared kernel support"
454 Select this option, if you want to share the text segment of the
455 Linux kernel between different VM guests. This reduces memory
456 usage with lots of guests but greatly increases kernel size.
457 Also if a kernel was IPL'ed from a shared segment the kexec system
459 You should only select this option if you know what you are
460 doing and want to exploit this feature.
464 prompt "Cooperative memory management"
466 Select this option, if you want to enable the kernel interface
467 to reduce the memory size of the system. This is accomplished
468 by allocating pages of memory and put them "on hold". This only
469 makes sense for a system running under VM where the unused pages
470 will be reused by VM for other guest systems. The interface
471 allows an external monitor to balance memory of many systems.
472 Everybody who wants to run Linux under VM should select this
477 prompt "IUCV special message interface to cooperative memory management"
478 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
480 Select this option to enable the special message interface to
481 the cooperative memory management.
485 prompt "Linux - VM Monitor Stream, base infrastructure"
488 This provides a kernel interface for creating and updating z/VM APPLDATA
489 monitor records. The monitor records are updated at certain time
490 intervals, once the timer is started.
491 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
492 i.e. enables or disables monitoring on the Linux side.
493 A custom interval value (in seconds) can be written to
494 /proc/appldata/interval.
496 Defaults are 60 seconds interval and timer off.
497 The /proc entries can also be read from, showing the current settings.
501 prompt "Monitor memory management statistics"
502 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
504 This provides memory management related data to the Linux - VM Monitor
505 Stream, like paging/swapping rate, memory utilisation, etc.
506 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
507 APPLDATA monitor record, i.e. enables or disables monitoring this record
511 The /proc entry can also be read from, showing the current settings.
513 This can also be compiled as a module, which will be called
518 prompt "Monitor OS statistics"
519 depends on APPLDATA_BASE
521 This provides OS related data to the Linux - VM Monitor Stream, like
522 CPU utilisation, etc.
523 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
524 APPLDATA monitor record, i.e. enables or disables monitoring this record
528 This can also be compiled as a module, which will be called
531 config APPLDATA_NET_SUM
533 prompt "Monitor overall network statistics"
534 depends on APPLDATA_BASE && NET
536 This provides network related data to the Linux - VM Monitor Stream,
537 currently there is only a total sum of network I/O statistics, no
539 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
540 APPLDATA monitor record, i.e. enables or disables monitoring this record
544 This can also be compiled as a module, which will be called
547 source kernel/Kconfig.hz
551 prompt "s390 hypervisor file system support"
552 select SYS_HYPERVISOR
554 This is a virtual file system intended to provide accounting
555 information in an s390 hypervisor environment.
559 prompt "kexec system call"
561 kexec is a system call that implements the ability to shutdown your
562 current kernel, and to start another kernel. It is like a reboot
563 but is independent of hardware/microcode support.
566 bool "kernel crash dumps"
567 depends on 64BIT && SMP
570 Generate crash dump after being started by kexec.
571 Crash dump kernels are loaded in the main kernel with kexec-tools
572 into a specially reserved region and then later executed after
573 a crash by kdump/kexec.
574 For more details see Documentation/kdump/kdump.txt
578 prompt "zfcpdump support"
581 Select this option if you want to build an zfcpdump enabled kernel.
582 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
586 prompt "s390 guest support for KVM (EXPERIMENTAL)"
587 depends on 64BIT && EXPERIMENTAL
588 select VIRTUALIZATION
591 select VIRTIO_CONSOLE
593 Select this option if you want to run the kernel as a guest under
594 the KVM hypervisor. This will add detection for KVM as well as a
595 virtio transport. If KVM is detected, the virtio console will be
600 prompt "Enable seccomp to safely compute untrusted bytecode"
603 This kernel feature is useful for number crunching applications
604 that may need to compute untrusted bytecode during their
605 execution. By using pipes or other transports made available to
606 the process as file descriptors supporting the read/write
607 syscalls, it's possible to isolate those applications in
608 their own address space using seccomp. Once seccomp is
609 enabled via /proc/<pid>/seccomp, it cannot be disabled
610 and the task is only allowed to execute a few safe syscalls
611 defined by each seccomp mode.
617 menu "Power Management"
619 source "kernel/power/Kconfig"
631 source "drivers/Kconfig"
635 source "arch/s390/Kconfig.debug"
637 source "security/Kconfig"
639 source "crypto/Kconfig"
643 source "arch/s390/kvm/Kconfig"