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 ARCH_SUPPORTS_DEBUG_PAGEALLOC
63 select USE_GENERIC_SMP_HELPERS if SMP
64 select GENERIC_CPU_DEVICES if !SMP
65 select HAVE_SYSCALL_WRAPPERS
66 select HAVE_FUNCTION_TRACER
67 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
68 select HAVE_FTRACE_MCOUNT_RECORD
69 select HAVE_C_RECORDMCOUNT
70 select HAVE_SYSCALL_TRACEPOINTS
71 select SYSCTL_EXCEPTION_TRACE
72 select HAVE_DYNAMIC_FTRACE
73 select HAVE_FUNCTION_GRAPH_TRACER
74 select HAVE_REGS_AND_STACK_ACCESS_API
77 select HAVE_KRETPROBES
78 select HAVE_KVM if 64BIT
79 select HAVE_ARCH_TRACEHOOK
80 select INIT_ALL_POSSIBLE
82 select HAVE_PERF_EVENTS
83 select ARCH_HAVE_NMI_SAFE_CMPXCHG
84 select HAVE_DEBUG_KMEMLEAK
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_BPF_JIT if 64BIT && PACK_STACK
93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
94 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
96 select HAVE_MEMBLOCK_NODE_MAP
97 select HAVE_CMPXCHG_LOCAL
98 select HAVE_CMPXCHG_DOUBLE
99 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
100 select HAVE_VIRT_CPU_ACCOUNTING
101 select VIRT_CPU_ACCOUNTING
102 select ARCH_DISCARD_MEMBLOCK
103 select BUILDTIME_EXTABLE_SORT
104 select ARCH_INLINE_SPIN_TRYLOCK
105 select ARCH_INLINE_SPIN_TRYLOCK_BH
106 select ARCH_INLINE_SPIN_LOCK
107 select ARCH_INLINE_SPIN_LOCK_BH
108 select ARCH_INLINE_SPIN_LOCK_IRQ
109 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
110 select ARCH_INLINE_SPIN_UNLOCK
111 select ARCH_INLINE_SPIN_UNLOCK_BH
112 select ARCH_INLINE_SPIN_UNLOCK_IRQ
113 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
114 select ARCH_INLINE_READ_TRYLOCK
115 select ARCH_INLINE_READ_LOCK
116 select ARCH_INLINE_READ_LOCK_BH
117 select ARCH_INLINE_READ_LOCK_IRQ
118 select ARCH_INLINE_READ_LOCK_IRQSAVE
119 select ARCH_INLINE_READ_UNLOCK
120 select ARCH_INLINE_READ_UNLOCK_BH
121 select ARCH_INLINE_READ_UNLOCK_IRQ
122 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
123 select ARCH_INLINE_WRITE_TRYLOCK
124 select ARCH_INLINE_WRITE_LOCK
125 select ARCH_INLINE_WRITE_LOCK_BH
126 select ARCH_INLINE_WRITE_LOCK_IRQ
127 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
128 select ARCH_INLINE_WRITE_UNLOCK
129 select ARCH_INLINE_WRITE_UNLOCK_BH
130 select ARCH_INLINE_WRITE_UNLOCK_IRQ
131 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
132 select HAVE_UID16 if 32BIT
133 select ARCH_WANT_IPC_PARSE_VERSION
134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
135 select GENERIC_SMP_IDLE_THREAD
136 select GENERIC_TIME_VSYSCALL_OLD
137 select GENERIC_CLOCKEVENTS
138 select KTIME_SCALAR if 32BIT
139 select HAVE_ARCH_SECCOMP_FILTER
140 select GENERIC_KERNEL_THREAD
141 select GENERIC_KERNEL_EXECVE
142 select HAVE_MOD_ARCH_SPECIFIC
143 select MODULES_USE_ELF_RELA
144 select CLONE_BACKWARDS2
146 config SCHED_OMIT_FRAME_POINTER
149 source "init/Kconfig"
151 source "kernel/Kconfig.freezer"
153 menu "Processor type and features"
155 config HAVE_MARCH_Z900_FEATURES
158 config HAVE_MARCH_Z990_FEATURES
160 select HAVE_MARCH_Z900_FEATURES
162 config HAVE_MARCH_Z9_109_FEATURES
164 select HAVE_MARCH_Z990_FEATURES
166 config HAVE_MARCH_Z10_FEATURES
168 select HAVE_MARCH_Z9_109_FEATURES
170 config HAVE_MARCH_Z196_FEATURES
172 select HAVE_MARCH_Z10_FEATURES
175 prompt "Processor type"
179 bool "System/390 model G5 and G6"
182 Select this to build a 31 bit kernel that works
183 on all ESA/390 and z/Architecture machines.
186 bool "IBM zSeries model z800 and z900"
187 select HAVE_MARCH_Z900_FEATURES if 64BIT
189 Select this to enable optimizations for model z800/z900 (2064 and
190 2066 series). This will enable some optimizations that are not
191 available on older ESA/390 (31 Bit) only CPUs.
194 bool "IBM zSeries model z890 and z990"
195 select HAVE_MARCH_Z990_FEATURES if 64BIT
197 Select this to enable optimizations for model z890/z990 (2084 and
198 2086 series). The kernel will be slightly faster but will not work
203 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
205 Select this to enable optimizations for IBM System z9 (2094 and
206 2096 series). The kernel will be slightly faster but will not work
210 bool "IBM System z10"
211 select HAVE_MARCH_Z10_FEATURES if 64BIT
213 Select this to enable optimizations for IBM System z10 (2097 and
214 2098 series). The kernel will be slightly faster but will not work
218 bool "IBM zEnterprise 114 and 196"
219 select HAVE_MARCH_Z196_FEATURES if 64BIT
221 Select this to enable optimizations for IBM zEnterprise 114 and 196
222 (2818 and 2817 series). The kernel will be slightly faster but will
223 not work on older machines.
229 prompt "64 bit kernel"
231 Select this option if you have an IBM z/Architecture machine
232 and want to use the 64 bit addressing mode.
239 prompt "Kernel support for 31 bit emulation"
241 select COMPAT_BINFMT_ELF if BINFMT_ELF
242 select ARCH_WANT_OLD_COMPAT_IPC
244 Select this option if you want to enable your system kernel to
245 handle system-calls from ELF binaries for 31 bit ESA. This option
246 (and some other stuff like libraries and such) is needed for
247 executing 31 bit applications. It is safe to say "Y".
249 config SYSVIPC_COMPAT
250 def_bool y if COMPAT && SYSVIPC
253 def_bool y if COMPAT && KEYS
257 prompt "Symmetric multi-processing support"
259 This enables support for systems with more than one CPU. If you have
260 a system with only one CPU, like most personal computers, say N. If
261 you have a system with more than one CPU, say Y.
263 If you say N here, the kernel will run on single and multiprocessor
264 machines, but will use only one CPU of a multiprocessor machine. If
265 you say Y here, the kernel will run on many, but not all,
266 singleprocessor machines. On a singleprocessor machine, the kernel
267 will run faster if you say N here.
269 See also the SMP-HOWTO available at
270 <http://www.tldp.org/docs.html#howto>.
272 Even if you don't know what to do here, say Y.
275 int "Maximum number of CPUs (2-64)"
278 default "32" if !64BIT
279 default "64" if 64BIT
281 This allows you to specify the maximum number of CPUs which this
282 kernel will support. The maximum supported value is 64 and the
283 minimum value which makes sense is 2.
285 This is purely to save memory - each supported CPU adds
286 approximately sixteen kilobytes to the kernel image.
290 prompt "Support for hot-pluggable CPUs"
294 Say Y here to be able to turn CPUs off and on. CPUs
295 can be controlled through /sys/devices/system/cpu/cpu#.
296 Say N if you want to disable CPU hotplug.
303 prompt "Book scheduler support"
307 Book scheduler support improves the CPU scheduler's decision making
308 when dealing with machines that have several books.
310 source kernel/Kconfig.preempt
314 prompt "IEEE FPU emulation"
317 This option is required for IEEE compliant floating point arithmetic
318 on older ESA/390 machines. Say Y unless you know your machine doesn't
321 source kernel/Kconfig.hz
327 config ARCH_SPARSEMEM_ENABLE
329 select SPARSEMEM_VMEMMAP_ENABLE
330 select SPARSEMEM_VMEMMAP
331 select SPARSEMEM_STATIC if !64BIT
333 config ARCH_SPARSEMEM_DEFAULT
336 config ARCH_SELECT_MEMORY_MODEL
339 config ARCH_ENABLE_MEMORY_HOTPLUG
340 def_bool y if SPARSEMEM
342 config ARCH_ENABLE_MEMORY_HOTREMOVE
345 config FORCE_MAX_ZONEORDER
353 prompt "Pack kernel stack"
355 This option enables the compiler option -mkernel-backchain if it
356 is available. If the option is available the compiler supports
357 the new stack layout which dramatically reduces the minimum stack
358 frame size. With an old compiler a non-leaf function needs a
359 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
360 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
361 and 24 byte on 64 bit.
363 Say Y if you are unsure.
367 prompt "Use 8kb for kernel stack instead of 16kb"
368 depends on PACK_STACK && 64BIT && !LOCKDEP
370 If you say Y here and the compiler supports the -mkernel-backchain
371 option the kernel will use a smaller kernel stack size. The reduced
372 size is 8kb instead of 16kb. This allows to run more threads on a
373 system and reduces the pressure on the memory management for higher
374 order page allocations.
376 Say N if you are unsure.
380 prompt "Detect kernel stack overflow"
382 This option enables the compiler option -mstack-guard and
383 -mstack-size if they are available. If the compiler supports them
384 it will emit additional code to each function prolog to trigger
385 an illegal operation if the kernel stack is about to overflow.
387 Say N if you are unsure.
390 int "Size of the guard area (128-1024)"
392 depends on CHECK_STACK
395 This allows you to specify the size of the guard area at the lower
396 end of the kernel stack. If the kernel stack points into the guard
397 area on function entry an illegal operation is triggered. The size
398 needs to be a power of 2. Please keep in mind that the size of an
399 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
400 The minimum size for the stack guard should be 256 for 31 bit and
403 config WARN_DYNAMIC_STACK
405 prompt "Emit compiler warnings for function with dynamic stack usage"
407 This option enables the compiler option -mwarn-dynamicstack. If the
408 compiler supports this options generates warnings for functions
409 that dynamically allocate stack space using alloca.
411 Say N if you are unsure.
419 prompt "QDIO support"
421 This driver provides the Queued Direct I/O base support for
424 To compile this driver as a module, choose M here: the
425 module will be called qdio.
431 prompt "Support for CHSC subchannels"
433 This driver allows usage of CHSC subchannels. A CHSC subchannel
434 is usually present on LPAR only.
435 The driver creates a device /dev/chsc, which may be used to
436 obtain I/O configuration information about the machine and
437 to issue asynchronous chsc commands (DANGEROUS).
438 You will usually only want to use this interface on a special
439 LPAR designated for system management.
441 To compile this driver as a module, choose M here: the
442 module will be called chsc_sch.
449 prompt "SCM bus driver"
451 Bus driver for Storage Class Memory.
455 prompt "Support for EADM subchannels"
458 This driver allows usage of EADM subchannels. EADM subchannels act
459 as a communication vehicle for SCM increments.
461 To compile this driver as a module, choose M here: the
462 module will be called eadm_sch.
469 bool "kernel crash dumps"
470 depends on 64BIT && SMP
473 Generate crash dump after being started by kexec.
474 Crash dump kernels are loaded in the main kernel with kexec-tools
475 into a specially reserved region and then later executed after
476 a crash by kdump/kexec.
477 For more details see Documentation/kdump/kdump.txt
481 prompt "zfcpdump support"
484 Select this option if you want to build an zfcpdump enabled kernel.
485 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
489 menu "Executable file formats / Emulations"
491 source "fs/Kconfig.binfmt"
495 prompt "Enable seccomp to safely compute untrusted bytecode"
498 This kernel feature is useful for number crunching applications
499 that may need to compute untrusted bytecode during their
500 execution. By using pipes or other transports made available to
501 the process as file descriptors supporting the read/write
502 syscalls, it's possible to isolate those applications in
503 their own address space using seccomp. Once seccomp is
504 enabled via /proc/<pid>/seccomp, it cannot be disabled
505 and the task is only allowed to execute a few safe syscalls
506 defined by each seccomp mode.
512 menu "Power Management"
514 config ARCH_HIBERNATION_POSSIBLE
517 source "kernel/power/Kconfig"
529 source "drivers/Kconfig"
533 source "arch/s390/Kconfig.debug"
535 source "security/Kconfig"
537 source "crypto/Kconfig"
541 menu "Virtualization"
545 prompt "Pseudo page fault support"
547 Select this option, if you want to use PFAULT pseudo page fault
548 handling under VM. If running native or in LPAR, this option
549 has no effect. If your VM does not support PFAULT, PAGEEX
550 pseudo page fault handling will be used.
551 Note that VM 4.2 supports PFAULT but has a bug in its
552 implementation that causes some problems.
553 Everybody who wants to run Linux under VM != VM4.2 should select
557 bool "VM shared kernel support"
558 depends on !JUMP_LABEL
560 Select this option, if you want to share the text segment of the
561 Linux kernel between different VM guests. This reduces memory
562 usage with lots of guests but greatly increases kernel size.
563 Also if a kernel was IPL'ed from a shared segment the kexec system
565 You should only select this option if you know what you are
566 doing and want to exploit this feature.
570 prompt "Cooperative memory management"
572 Select this option, if you want to enable the kernel interface
573 to reduce the memory size of the system. This is accomplished
574 by allocating pages of memory and put them "on hold". This only
575 makes sense for a system running under VM where the unused pages
576 will be reused by VM for other guest systems. The interface
577 allows an external monitor to balance memory of many systems.
578 Everybody who wants to run Linux under VM should select this
583 prompt "IUCV special message interface to cooperative memory management"
584 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
586 Select this option to enable the special message interface to
587 the cooperative memory management.
591 prompt "Linux - VM Monitor Stream, base infrastructure"
594 This provides a kernel interface for creating and updating z/VM APPLDATA
595 monitor records. The monitor records are updated at certain time
596 intervals, once the timer is started.
597 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
598 i.e. enables or disables monitoring on the Linux side.
599 A custom interval value (in seconds) can be written to
600 /proc/appldata/interval.
602 Defaults are 60 seconds interval and timer off.
603 The /proc entries can also be read from, showing the current settings.
607 prompt "Monitor memory management statistics"
608 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
610 This provides memory management related data to the Linux - VM Monitor
611 Stream, like paging/swapping rate, memory utilisation, etc.
612 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
613 APPLDATA monitor record, i.e. enables or disables monitoring this record
617 The /proc entry can also be read from, showing the current settings.
619 This can also be compiled as a module, which will be called
624 prompt "Monitor OS statistics"
625 depends on APPLDATA_BASE
627 This provides OS related data to the Linux - VM Monitor Stream, like
628 CPU utilisation, etc.
629 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
630 APPLDATA monitor record, i.e. enables or disables monitoring this record
634 This can also be compiled as a module, which will be called
637 config APPLDATA_NET_SUM
639 prompt "Monitor overall network statistics"
640 depends on APPLDATA_BASE && NET
642 This provides network related data to the Linux - VM Monitor Stream,
643 currently there is only a total sum of network I/O statistics, no
645 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
646 APPLDATA monitor record, i.e. enables or disables monitoring this record
650 This can also be compiled as a module, which will be called
655 prompt "s390 hypervisor file system support"
656 select SYS_HYPERVISOR
658 This is a virtual file system intended to provide accounting
659 information in an s390 hypervisor environment.
661 source "arch/s390/kvm/Kconfig"
665 prompt "s390 support for virtio devices (EXPERIMENTAL)"
666 depends on 64BIT && EXPERIMENTAL
667 select VIRTUALIZATION
669 select VIRTIO_CONSOLE
671 Enabling this option adds support for virtio based paravirtual device
674 Select this option if you want to run the kernel as a guest under