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 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
78 select HAVE_KRETPROBES
79 select HAVE_KVM if 64BIT
80 select HAVE_ARCH_TRACEHOOK
81 select INIT_ALL_POSSIBLE
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
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
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
126 config SCHED_OMIT_FRAME_POINTER
129 source "init/Kconfig"
131 source "kernel/Kconfig.freezer"
135 comment "Processor type and features"
137 source "kernel/time/Kconfig"
141 prompt "64 bit kernel"
143 Select this option if you have an IBM z/Architecture machine
144 and want to use the 64 bit addressing mode.
154 prompt "Symmetric multi-processing support"
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.
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.
166 See also the SMP-HOWTO available at
167 <http://www.tldp.org/docs.html#howto>.
169 Even if you don't know what to do here, say Y.
172 int "Maximum number of CPUs (2-64)"
175 default "32" if !64BIT
176 default "64" if 64BIT
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.
182 This is purely to save memory - each supported CPU adds
183 approximately sixteen kilobytes to the kernel image.
187 prompt "Support for hot-pluggable CPUs"
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.
200 prompt "Book scheduler support"
204 Book scheduler support improves the CPU scheduler's decision making
205 when dealing with machines that have several books.
209 prompt "IEEE FPU emulation"
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
218 prompt "Kernel support for 31 bit emulation"
220 select COMPAT_BINFMT_ELF
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".
227 config SYSVIPC_COMPAT
228 def_bool y if COMPAT && SYSVIPC
233 comment "Code generation options"
236 prompt "Processor type"
240 bool "System/390 model G5 and G6"
243 Select this to build a 31 bit kernel that works
244 on all ESA/390 and z/Architecture machines.
247 bool "IBM zSeries model z800 and z900"
249 Select this to enable optimizations for model z800/z900 (2064 and
250 2066 series). This will enable some optimizations that are not
251 available on older ESA/390 (31 Bit) only CPUs.
254 bool "IBM zSeries model z890 and z990"
256 Select this to enable optimizations for model z890/z990 (2084 and
257 2086 series). The kernel will be slightly faster but will not work
263 Select this to enable optimizations for IBM System z9 (2094 and
264 2096 series). The kernel will be slightly faster but will not work
268 bool "IBM System z10"
270 Select this to enable optimizations for IBM System z10 (2097 and
271 2098 series). The kernel will be slightly faster but will not work
275 bool "IBM zEnterprise 114 and 196"
277 Select this to enable optimizations for IBM zEnterprise 114 and 196
278 (2818 and 2817 series). The kernel will be slightly faster but will
279 not work on older machines.
285 prompt "Pack kernel stack"
287 This option enables the compiler option -mkernel-backchain if it
288 is available. If the option is available the compiler supports
289 the new stack layout which dramatically reduces the minimum stack
290 frame size. With an old compiler a non-leaf function needs a
291 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
292 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
293 and 24 byte on 64 bit.
295 Say Y if you are unsure.
299 prompt "Use 8kb for kernel stack instead of 16kb"
300 depends on PACK_STACK && 64BIT && !LOCKDEP
302 If you say Y here and the compiler supports the -mkernel-backchain
303 option the kernel will use a smaller kernel stack size. The reduced
304 size is 8kb instead of 16kb. This allows to run more threads on a
305 system and reduces the pressure on the memory management for higher
306 order page allocations.
308 Say N if you are unsure.
312 prompt "Detect kernel stack overflow"
314 This option enables the compiler option -mstack-guard and
315 -mstack-size if they are available. If the compiler supports them
316 it will emit additional code to each function prolog to trigger
317 an illegal operation if the kernel stack is about to overflow.
319 Say N if you are unsure.
322 int "Size of the guard area (128-1024)"
324 depends on CHECK_STACK
327 This allows you to specify the size of the guard area at the lower
328 end of the kernel stack. If the kernel stack points into the guard
329 area on function entry an illegal operation is triggered. The size
330 needs to be a power of 2. Please keep in mind that the size of an
331 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
332 The minimum size for the stack guard should be 256 for 31 bit and
335 config WARN_DYNAMIC_STACK
337 prompt "Emit compiler warnings for function with dynamic stack usage"
339 This option enables the compiler option -mwarn-dynamicstack. If the
340 compiler supports this options generates warnings for functions
341 that dynamically allocate stack space using alloca.
343 Say N if you are unsure.
345 comment "Kernel preemption"
347 source "kernel/Kconfig.preempt"
349 config ARCH_SPARSEMEM_ENABLE
351 select SPARSEMEM_VMEMMAP_ENABLE
352 select SPARSEMEM_VMEMMAP
353 select SPARSEMEM_STATIC if !64BIT
355 config ARCH_SPARSEMEM_DEFAULT
358 config ARCH_SELECT_MEMORY_MODEL
361 config ARCH_ENABLE_MEMORY_HOTPLUG
362 def_bool y if SPARSEMEM
364 config ARCH_ENABLE_MEMORY_HOTREMOVE
367 config ARCH_HIBERNATION_POSSIBLE
372 comment "I/O subsystem configuration"
376 prompt "QDIO support"
378 This driver provides the Queued Direct I/O base support for
381 To compile this driver as a module, choose M here: the
382 module will be called qdio.
388 prompt "Support for CHSC subchannels"
390 This driver allows usage of CHSC subchannels. A CHSC subchannel
391 is usually present on LPAR only.
392 The driver creates a device /dev/chsc, which may be used to
393 obtain I/O configuration information about the machine and
394 to issue asynchronous chsc commands (DANGEROUS).
395 You will usually only want to use this interface on a special
396 LPAR designated for system management.
398 To compile this driver as a module, choose M here: the
399 module will be called chsc_sch.
407 prompt "Builtin IPL record support"
409 If you want to use the produced kernel to IPL directly from a
410 device, you have to merge a bootsector specific to the device
411 into the first bytes of the kernel. You will have to select the
415 prompt "IPL method generated into head.S"
419 Select "tape" if you want to IPL the image from a Tape.
421 Select "vm_reader" if you are running under VM/ESA and want
422 to IPL the image from the emulated card reader.
432 source "fs/Kconfig.binfmt"
434 config FORCE_MAX_ZONEORDER
440 prompt "Pseudo page fault support"
442 Select this option, if you want to use PFAULT pseudo page fault
443 handling under VM. If running native or in LPAR, this option
444 has no effect. If your VM does not support PFAULT, PAGEEX
445 pseudo page fault handling will be used.
446 Note that VM 4.2 supports PFAULT but has a bug in its
447 implementation that causes some problems.
448 Everybody who wants to run Linux under VM != VM4.2 should select
453 prompt "VM shared kernel support"
455 Select this option, if you want to share the text segment of the
456 Linux kernel between different VM guests. This reduces memory
457 usage with lots of guests but greatly increases kernel size.
458 Also if a kernel was IPL'ed from a shared segment the kexec system
460 You should only select this option if you know what you are
461 doing and want to exploit this feature.
465 prompt "Cooperative memory management"
467 Select this option, if you want to enable the kernel interface
468 to reduce the memory size of the system. This is accomplished
469 by allocating pages of memory and put them "on hold". This only
470 makes sense for a system running under VM where the unused pages
471 will be reused by VM for other guest systems. The interface
472 allows an external monitor to balance memory of many systems.
473 Everybody who wants to run Linux under VM should select this
478 prompt "IUCV special message interface to cooperative memory management"
479 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
481 Select this option to enable the special message interface to
482 the cooperative memory management.
486 prompt "Linux - VM Monitor Stream, base infrastructure"
489 This provides a kernel interface for creating and updating z/VM APPLDATA
490 monitor records. The monitor records are updated at certain time
491 intervals, once the timer is started.
492 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
493 i.e. enables or disables monitoring on the Linux side.
494 A custom interval value (in seconds) can be written to
495 /proc/appldata/interval.
497 Defaults are 60 seconds interval and timer off.
498 The /proc entries can also be read from, showing the current settings.
502 prompt "Monitor memory management statistics"
503 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
505 This provides memory management related data to the Linux - VM Monitor
506 Stream, like paging/swapping rate, memory utilisation, etc.
507 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
508 APPLDATA monitor record, i.e. enables or disables monitoring this record
512 The /proc entry can also be read from, showing the current settings.
514 This can also be compiled as a module, which will be called
519 prompt "Monitor OS statistics"
520 depends on APPLDATA_BASE
522 This provides OS related data to the Linux - VM Monitor Stream, like
523 CPU utilisation, etc.
524 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
525 APPLDATA monitor record, i.e. enables or disables monitoring this record
529 This can also be compiled as a module, which will be called
532 config APPLDATA_NET_SUM
534 prompt "Monitor overall network statistics"
535 depends on APPLDATA_BASE && NET
537 This provides network related data to the Linux - VM Monitor Stream,
538 currently there is only a total sum of network I/O statistics, no
540 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
541 APPLDATA monitor record, i.e. enables or disables monitoring this record
545 This can also be compiled as a module, which will be called
548 source kernel/Kconfig.hz
552 prompt "s390 hypervisor file system support"
553 select SYS_HYPERVISOR
555 This is a virtual file system intended to provide accounting
556 information in an s390 hypervisor environment.
560 prompt "kexec system call"
562 kexec is a system call that implements the ability to shutdown your
563 current kernel, and to start another kernel. It is like a reboot
564 but is independent of hardware/microcode support.
567 bool "kernel crash dumps"
571 Generate crash dump after being started by kexec.
572 Crash dump kernels are loaded in the main kernel with kexec-tools
573 into a specially reserved region and then later executed after
574 a crash by kdump/kexec.
575 For more details see Documentation/kdump/kdump.txt
579 prompt "zfcpdump support"
582 Select this option if you want to build an zfcpdump enabled kernel.
583 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
587 prompt "s390 guest support for KVM (EXPERIMENTAL)"
588 depends on 64BIT && EXPERIMENTAL
589 select VIRTUALIZATION
592 select VIRTIO_CONSOLE
594 Select this option if you want to run the kernel as a guest under
595 the KVM hypervisor. This will add detection for KVM as well as a
596 virtio transport. If KVM is detected, the virtio console will be
601 prompt "Enable seccomp to safely compute untrusted bytecode"
604 This kernel feature is useful for number crunching applications
605 that may need to compute untrusted bytecode during their
606 execution. By using pipes or other transports made available to
607 the process as file descriptors supporting the read/write
608 syscalls, it's possible to isolate those applications in
609 their own address space using seccomp. Once seccomp is
610 enabled via /proc/<pid>/seccomp, it cannot be disabled
611 and the task is only allowed to execute a few safe syscalls
612 defined by each seccomp mode.
618 menu "Power Management"
620 source "kernel/power/Kconfig"
632 source "drivers/Kconfig"
636 source "arch/s390/Kconfig.debug"
638 source "security/Kconfig"
640 source "crypto/Kconfig"
644 source "arch/s390/kvm/Kconfig"