1config MMU
2 def_bool y
3
4config ZONE_DMA
5 def_bool y
6
7config LOCKDEP_SUPPORT
8 def_bool y
9
10config STACKTRACE_SUPPORT
11 def_bool y
12
13config HAVE_LATENCYTOP_SUPPORT
14 def_bool y
15
16config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
20 def_bool y
21
22config ARCH_HAS_ILOG2_U32
23 def_bool n
24
25config ARCH_HAS_ILOG2_U64
26 def_bool n
27
28config GENERIC_HWEIGHT
29 def_bool y
30
31config GENERIC_TIME_VSYSCALL
32 def_bool y
33
34config GENERIC_CLOCKEVENTS
35 def_bool y
36
37config GENERIC_BUG
38 def_bool y if BUG
39
40config GENERIC_BUG_RELATIVE_POINTERS
41 def_bool y
42
43config NO_IOMEM
44 def_bool y
45
46config NO_DMA
47 def_bool y
48
49config ARCH_DMA_ADDR_T_64BIT
50 def_bool 64BIT
51
52config GENERIC_LOCKBREAK
53 def_bool y if SMP && PREEMPT
54
55config PGSTE
56 def_bool y if KVM
57
58config VIRT_CPU_ACCOUNTING
59 def_bool y
60
61config ARCH_SUPPORTS_DEBUG_PAGEALLOC
62 def_bool y
63
64config S390
65 def_bool y
66 select USE_GENERIC_SMP_HELPERS if SMP
67 select HAVE_SYSCALL_WRAPPERS
68 select HAVE_FUNCTION_TRACER
69 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
70 select HAVE_FTRACE_MCOUNT_RECORD
71 select HAVE_C_RECORDMCOUNT
72 select HAVE_SYSCALL_TRACEPOINTS
73 select HAVE_DYNAMIC_FTRACE
74 select HAVE_FUNCTION_GRAPH_TRACER
75 select HAVE_REGS_AND_STACK_ACCESS_API
76 select HAVE_OPROFILE
77 select HAVE_KPROBES
78 select HAVE_KRETPROBES
79 select HAVE_KVM if 64BIT
80 select HAVE_ARCH_TRACEHOOK
81 select INIT_ALL_POSSIBLE
82 select HAVE_IRQ_WORK
83 select HAVE_PERF_EVENTS
84 select ARCH_HAVE_NMI_SAFE_CMPXCHG
85 select HAVE_KERNEL_GZIP
86 select HAVE_KERNEL_BZIP2
87 select HAVE_KERNEL_LZMA
88 select HAVE_KERNEL_LZO
89 select HAVE_KERNEL_XZ
90 select HAVE_ARCH_MUTEX_CPU_RELAX
91 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
92 select HAVE_RCU_TABLE_FREE if SMP
93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
94 select HAVE_MEMBLOCK
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
126config SCHED_OMIT_FRAME_POINTER
127 def_bool y
128
129source "init/Kconfig"
130
131source "kernel/Kconfig.freezer"
132
133menu "Base setup"
134
135comment "Processor type and features"
136
137source "kernel/time/Kconfig"
138
139config 64BIT
140 def_bool y
141 prompt "64 bit kernel"
142 help
143 Select this option if you have an IBM z/Architecture machine
144 and want to use the 64 bit addressing mode.
145
146config 32BIT
147 def_bool y if !64BIT
148
149config KTIME_SCALAR
150 def_bool 32BIT
151
152config SMP
153 def_bool y
154 prompt "Symmetric multi-processing support"
155 ---help---
156 This enables support for systems with more than one CPU. If you have
157 a system with only one CPU, like most personal computers, say N. If
158 you have a system with more than one CPU, say Y.
159
160 If you say N here, the kernel will run on single and multiprocessor
161 machines, but will use only one CPU of a multiprocessor machine. If
162 you say Y here, the kernel will run on many, but not all,
163 singleprocessor machines. On a singleprocessor machine, the kernel
164 will run faster if you say N here.
165
166 See also the SMP-HOWTO available at
167 <http://www.tldp.org/docs.html
168
169 Even if you don't know what to do here, say Y.
170
171config NR_CPUS
172 int "Maximum number of CPUs (2-64)"
173 range 2 64
174 depends on SMP
175 default "32" if !64BIT
176 default "64" if 64BIT
177 help
178 This allows you to specify the maximum number of CPUs which this
179 kernel will support. The maximum supported value is 64 and the
180 minimum value which makes sense is 2.
181
182 This is purely to save memory - each supported CPU adds
183 approximately sixteen kilobytes to the kernel image.
184
185config HOTPLUG_CPU
186 def_bool y
187 prompt "Support for hot-pluggable CPUs"
188 depends on SMP
189 select HOTPLUG
190 help
191 Say Y here to be able to turn CPUs off and on. CPUs
192 can be controlled through /sys/devices/system/cpu/cpu#.
193 Say N if you want to disable CPU hotplug.
194
195config SCHED_MC
196 def_bool n
197
198config SCHED_BOOK
199 def_bool y
200 prompt "Book scheduler support"
201 depends on SMP
202 select SCHED_MC
203 help
204 Book scheduler support improves the CPU scheduler's decision making
205 when dealing with machines that have several books.
206
207config MATHEMU
208 def_bool y
209 prompt "IEEE FPU emulation"
210 depends on MARCH_G5
211 help
212 This option is required for IEEE compliant floating point arithmetic
213 on older ESA/390 machines. Say Y unless you know your machine doesn't
214 need this.
215
216config COMPAT
217 def_bool y
218 prompt "Kernel support for 31 bit emulation"
219 depends on 64BIT
220 select COMPAT_BINFMT_ELF
221 help
222 Select this option if you want to enable your system kernel to
223 handle system-calls from ELF binaries for 31 bit ESA. This option
224 (and some other stuff like libraries and such) is needed for
225 executing 31 bit applications. It is safe to say "Y".
226
227config SYSVIPC_COMPAT
228 def_bool y if COMPAT && SYSVIPC
229
230config KEYS_COMPAT
231 def_bool y if COMPAT && KEYS
232
233config AUDIT_ARCH
234 def_bool y
235
236comment "Code generation options"
237
238choice
239 prompt "Processor type"
240 default MARCH_G5
241
242config MARCH_G5
243 bool "System/390 model G5 and G6"
244 depends on !64BIT
245 help
246 Select this to build a 31 bit kernel that works
247 on all ESA/390 and z/Architecture machines.
248
249config MARCH_Z900
250 bool "IBM zSeries model z800 and z900"
251 help
252 Select this to enable optimizations for model z800/z900 (2064 and
253 2066 series). This will enable some optimizations that are not
254 available on older ESA/390 (31 Bit) only CPUs.
255
256config MARCH_Z990
257 bool "IBM zSeries model z890 and z990"
258 help
259 Select this to enable optimizations for model z890/z990 (2084 and
260 2086 series). The kernel will be slightly faster but will not work
261 on older machines.
262
263config MARCH_Z9_109
264 bool "IBM System z9"
265 help
266 Select this to enable optimizations for IBM System z9 (2094 and
267 2096 series). The kernel will be slightly faster but will not work
268 on older machines.
269
270config MARCH_Z10
271 bool "IBM System z10"
272 help
273 Select this to enable optimizations for IBM System z10 (2097 and
274 2098 series). The kernel will be slightly faster but will not work
275 on older machines.
276
277config MARCH_Z196
278 bool "IBM zEnterprise 114 and 196"
279 help
280 Select this to enable optimizations for IBM zEnterprise 114 and 196
281 (2818 and 2817 series). The kernel will be slightly faster but will
282 not work on older machines.
283
284endchoice
285
286config PACK_STACK
287 def_bool y
288 prompt "Pack kernel stack"
289 help
290 This option enables the compiler option -mkernel-backchain if it
291 is available. If the option is available the compiler supports
292 the new stack layout which dramatically reduces the minimum stack
293 frame size. With an old compiler a non-leaf function needs a
294 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
295 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
296 and 24 byte on 64 bit.
297
298 Say Y if you are unsure.
299
300config SMALL_STACK
301 def_bool n
302 prompt "Use 8kb for kernel stack instead of 16kb"
303 depends on PACK_STACK && 64BIT && !LOCKDEP
304 help
305 If you say Y here and the compiler supports the -mkernel-backchain
306 option the kernel will use a smaller kernel stack size. The reduced
307 size is 8kb instead of 16kb. This allows to run more threads on a
308 system and reduces the pressure on the memory management for higher
309 order page allocations.
310
311 Say N if you are unsure.
312
313config CHECK_STACK
314 def_bool y
315 prompt "Detect kernel stack overflow"
316 help
317 This option enables the compiler option -mstack-guard and
318 -mstack-size if they are available. If the compiler supports them
319 it will emit additional code to each function prolog to trigger
320 an illegal operation if the kernel stack is about to overflow.
321
322 Say N if you are unsure.
323
324config STACK_GUARD
325 int "Size of the guard area (128-1024)"
326 range 128 1024
327 depends on CHECK_STACK
328 default "256"
329 help
330 This allows you to specify the size of the guard area at the lower
331 end of the kernel stack. If the kernel stack points into the guard
332 area on function entry an illegal operation is triggered. The size
333 needs to be a power of 2. Please keep in mind that the size of an
334 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
335 The minimum size for the stack guard should be 256 for 31 bit and
336 512 for 64 bit.
337
338config WARN_DYNAMIC_STACK
339 def_bool n
340 prompt "Emit compiler warnings for function with dynamic stack usage"
341 help
342 This option enables the compiler option -mwarn-dynamicstack. If the
343 compiler supports this options generates warnings for functions
344 that dynamically allocate stack space using alloca.
345
346 Say N if you are unsure.
347
348comment "Kernel preemption"
349
350source "kernel/Kconfig.preempt"
351
352config ARCH_SPARSEMEM_ENABLE
353 def_bool y
354 select SPARSEMEM_VMEMMAP_ENABLE
355 select SPARSEMEM_VMEMMAP
356 select SPARSEMEM_STATIC if !64BIT
357
358config ARCH_SPARSEMEM_DEFAULT
359 def_bool y
360
361config ARCH_SELECT_MEMORY_MODEL
362 def_bool y
363
364config ARCH_ENABLE_MEMORY_HOTPLUG
365 def_bool y if SPARSEMEM
366
367config ARCH_ENABLE_MEMORY_HOTREMOVE
368 def_bool y
369
370config ARCH_HIBERNATION_POSSIBLE
371 def_bool y if 64BIT
372
373source "mm/Kconfig"
374
375comment "I/O subsystem configuration"
376
377config QDIO
378 def_tristate y
379 prompt "QDIO support"
380 ---help---
381 This driver provides the Queued Direct I/O base support for
382 IBM System z.
383
384 To compile this driver as a module, choose M here: the
385 module will be called qdio.
386
387 If unsure, say Y.
388
389config CHSC_SCH
390 def_tristate m
391 prompt "Support for CHSC subchannels"
392 help
393 This driver allows usage of CHSC subchannels. A CHSC subchannel
394 is usually present on LPAR only.
395 The driver creates a device /dev/chsc, which may be used to
396 obtain I/O configuration information about the machine and
397 to issue asynchronous chsc commands (DANGEROUS).
398 You will usually only want to use this interface on a special
399 LPAR designated for system management.
400
401 To compile this driver as a module, choose M here: the
402 module will be called chsc_sch.
403
404 If unsure, say N.
405
406comment "Misc"
407
408config IPL
409 def_bool y
410 prompt "Builtin IPL record support"
411 help
412 If you want to use the produced kernel to IPL directly from a
413 device, you have to merge a bootsector specific to the device
414 into the first bytes of the kernel. You will have to select the
415 IPL device.
416
417choice
418 prompt "IPL method generated into head.S"
419 depends on IPL
420 default IPL_VM
421 help
422 Select "tape" if you want to IPL the image from a Tape.
423
424 Select "vm_reader" if you are running under VM/ESA and want
425 to IPL the image from the emulated card reader.
426
427config IPL_TAPE
428 bool "tape"
429
430config IPL_VM
431 bool "vm_reader"
432
433endchoice
434
435source "fs/Kconfig.binfmt"
436
437config FORCE_MAX_ZONEORDER
438 int
439 default "9"
440
441config PFAULT
442 def_bool y
443 prompt "Pseudo page fault support"
444 help
445 Select this option, if you want to use PFAULT pseudo page fault
446 handling under VM. If running native or in LPAR, this option
447 has no effect. If your VM does not support PFAULT, PAGEEX
448 pseudo page fault handling will be used.
449 Note that VM 4.2 supports PFAULT but has a bug in its
450 implementation that causes some problems.
451 Everybody who wants to run Linux under VM != VM4.2 should select
452 this option.
453
454config SHARED_KERNEL
455 def_bool y
456 prompt "VM shared kernel support"
457 help
458 Select this option, if you want to share the text segment of the
459 Linux kernel between different VM guests. This reduces memory
460 usage with lots of guests but greatly increases kernel size.
461 Also if a kernel was IPL'ed from a shared segment the kexec system
462 call will not work.
463 You should only select this option if you know what you are
464 doing and want to exploit this feature.
465
466config CMM
467 def_tristate n
468 prompt "Cooperative memory management"
469 help
470 Select this option, if you want to enable the kernel interface
471 to reduce the memory size of the system. This is accomplished
472 by allocating pages of memory and put them "on hold". This only
473 makes sense for a system running under VM where the unused pages
474 will be reused by VM for other guest systems. The interface
475 allows an external monitor to balance memory of many systems.
476 Everybody who wants to run Linux under VM should select this
477 option.
478
479config CMM_IUCV
480 def_bool y
481 prompt "IUCV special message interface to cooperative memory management"
482 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
483 help
484 Select this option to enable the special message interface to
485 the cooperative memory management.
486
487config APPLDATA_BASE
488 def_bool n
489 prompt "Linux - VM Monitor Stream, base infrastructure"
490 depends on PROC_FS
491 help
492 This provides a kernel interface for creating and updating z/VM APPLDATA
493 monitor records. The monitor records are updated at certain time
494 intervals, once the timer is started.
495 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
496 i.e. enables or disables monitoring on the Linux side.
497 A custom interval value (in seconds) can be written to
498 /proc/appldata/interval.
499
500 Defaults are 60 seconds interval and timer off.
501 The /proc entries can also be read from, showing the current settings.
502
503config APPLDATA_MEM
504 def_tristate m
505 prompt "Monitor memory management statistics"
506 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
507 help
508 This provides memory management related data to the Linux - VM Monitor
509 Stream, like paging/swapping rate, memory utilisation, etc.
510 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
511 APPLDATA monitor record, i.e. enables or disables monitoring this record
512 on the z/VM side.
513
514 Default is disabled.
515 The /proc entry can also be read from, showing the current settings.
516
517 This can also be compiled as a module, which will be called
518 appldata_mem.o.
519
520config APPLDATA_OS
521 def_tristate m
522 prompt "Monitor OS statistics"
523 depends on APPLDATA_BASE
524 help
525 This provides OS related data to the Linux - VM Monitor Stream, like
526 CPU utilisation, etc.
527 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
528 APPLDATA monitor record, i.e. enables or disables monitoring this record
529 on the z/VM side.
530
531 Default is disabled.
532 This can also be compiled as a module, which will be called
533 appldata_os.o.
534
535config APPLDATA_NET_SUM
536 def_tristate m
537 prompt "Monitor overall network statistics"
538 depends on APPLDATA_BASE && NET
539 help
540 This provides network related data to the Linux - VM Monitor Stream,
541 currently there is only a total sum of network I/O statistics, no
542 per-interface data.
543 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
544 APPLDATA monitor record, i.e. enables or disables monitoring this record
545 on the z/VM side.
546
547 Default is disabled.
548 This can also be compiled as a module, which will be called
549 appldata_net_sum.o.
550
551source kernel/Kconfig.hz
552
553config S390_HYPFS_FS
554 def_bool y
555 prompt "s390 hypervisor file system support"
556 select SYS_HYPERVISOR
557 help
558 This is a virtual file system intended to provide accounting
559 information in an s390 hypervisor environment.
560
561config KEXEC
562 def_bool n
563 prompt "kexec system call"
564 help
565 kexec is a system call that implements the ability to shutdown your
566 current kernel, and to start another kernel. It is like a reboot
567 but is independent of hardware/microcode support.
568
569config CRASH_DUMP
570 bool "kernel crash dumps"
571 depends on 64BIT
572 select KEXEC
573 help
574 Generate crash dump after being started by kexec.
575 Crash dump kernels are loaded in the main kernel with kexec-tools
576 into a specially reserved region and then later executed after
577 a crash by kdump/kexec.
578 For more details see Documentation/kdump/kdump.txt
579
580config ZFCPDUMP
581 def_bool n
582 prompt "zfcpdump support"
583 select SMP
584 help
585 Select this option if you want to build an zfcpdump enabled kernel.
586 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
587
588config S390_GUEST
589 def_bool y
590 prompt "s390 guest support for KVM (EXPERIMENTAL)"
591 depends on 64BIT && EXPERIMENTAL
592 select VIRTUALIZATION
593 select VIRTIO
594 select VIRTIO_RING
595 select VIRTIO_CONSOLE
596 help
597 Select this option if you want to run the kernel as a guest under
598 the KVM hypervisor. This will add detection for KVM as well as a
599 virtio transport. If KVM is detected, the virtio console will be
600 the default console.
601
602config SECCOMP
603 def_bool y
604 prompt "Enable seccomp to safely compute untrusted bytecode"
605 depends on PROC_FS
606 help
607 This kernel feature is useful for number crunching applications
608 that may need to compute untrusted bytecode during their
609 execution. By using pipes or other transports made available to
610 the process as file descriptors supporting the read/write
611 syscalls, it's possible to isolate those applications in
612 their own address space using seccomp. Once seccomp is
613 enabled via /proc/<pid>/seccomp, it cannot be disabled
614 and the task is only allowed to execute a few safe syscalls
615 defined by each seccomp mode.
616
617 If unsure, say Y.
618
619endmenu
620
621menu "Power Management"
622
623source "kernel/power/Kconfig"
624
625endmenu
626
627source "net/Kconfig"
628
629config PCMCIA
630 def_bool n
631
632config CCW
633 def_bool y
634
635source "drivers/Kconfig"
636
637source "fs/Kconfig"
638
639source "arch/s390/Kconfig.debug"
640
641source "security/Kconfig"
642
643source "crypto/Kconfig"
644
645source "lib/Kconfig"
646
647source "arch/s390/kvm/Kconfig"
648
