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 HAVE_DYNAMIC_FTRACE
72 select HAVE_FUNCTION_GRAPH_TRACER
73 select HAVE_REGS_AND_STACK_ACCESS_API
76 select HAVE_KRETPROBES
77 select HAVE_KVM if 64BIT
78 select HAVE_ARCH_TRACEHOOK
79 select INIT_ALL_POSSIBLE
81 select HAVE_PERF_EVENTS
82 select ARCH_HAVE_NMI_SAFE_CMPXCHG
83 select HAVE_KERNEL_GZIP
84 select HAVE_KERNEL_BZIP2
85 select HAVE_KERNEL_LZMA
86 select HAVE_KERNEL_LZO
88 select HAVE_ARCH_MUTEX_CPU_RELAX
89 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
90 select HAVE_BPF_JIT if 64BIT && PACK_STACK
91 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
92 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
94 select HAVE_MEMBLOCK_NODE_MAP
95 select HAVE_CMPXCHG_LOCAL
96 select HAVE_CMPXCHG_DOUBLE
97 select HAVE_VIRT_CPU_ACCOUNTING
98 select VIRT_CPU_ACCOUNTING
99 select ARCH_DISCARD_MEMBLOCK
100 select BUILDTIME_EXTABLE_SORT
101 select ARCH_INLINE_SPIN_TRYLOCK
102 select ARCH_INLINE_SPIN_TRYLOCK_BH
103 select ARCH_INLINE_SPIN_LOCK
104 select ARCH_INLINE_SPIN_LOCK_BH
105 select ARCH_INLINE_SPIN_LOCK_IRQ
106 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
107 select ARCH_INLINE_SPIN_UNLOCK
108 select ARCH_INLINE_SPIN_UNLOCK_BH
109 select ARCH_INLINE_SPIN_UNLOCK_IRQ
110 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
111 select ARCH_INLINE_READ_TRYLOCK
112 select ARCH_INLINE_READ_LOCK
113 select ARCH_INLINE_READ_LOCK_BH
114 select ARCH_INLINE_READ_LOCK_IRQ
115 select ARCH_INLINE_READ_LOCK_IRQSAVE
116 select ARCH_INLINE_READ_UNLOCK
117 select ARCH_INLINE_READ_UNLOCK_BH
118 select ARCH_INLINE_READ_UNLOCK_IRQ
119 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
120 select ARCH_INLINE_WRITE_TRYLOCK
121 select ARCH_INLINE_WRITE_LOCK
122 select ARCH_INLINE_WRITE_LOCK_BH
123 select ARCH_INLINE_WRITE_LOCK_IRQ
124 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
125 select ARCH_INLINE_WRITE_UNLOCK
126 select ARCH_INLINE_WRITE_UNLOCK_BH
127 select ARCH_INLINE_WRITE_UNLOCK_IRQ
128 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
129 select ARCH_WANT_IPC_PARSE_VERSION
130 select GENERIC_SMP_IDLE_THREAD
131 select GENERIC_TIME_VSYSCALL
132 select GENERIC_CLOCKEVENTS
133 select KTIME_SCALAR if 32BIT
134 select HAVE_ARCH_SECCOMP_FILTER
136 config SCHED_OMIT_FRAME_POINTER
139 source "init/Kconfig"
141 source "kernel/Kconfig.freezer"
143 menu "Processor type and features"
145 config HAVE_MARCH_Z900_FEATURES
148 config HAVE_MARCH_Z990_FEATURES
150 select HAVE_MARCH_Z900_FEATURES
152 config HAVE_MARCH_Z9_109_FEATURES
154 select HAVE_MARCH_Z990_FEATURES
156 config HAVE_MARCH_Z10_FEATURES
158 select HAVE_MARCH_Z9_109_FEATURES
160 config HAVE_MARCH_Z196_FEATURES
162 select HAVE_MARCH_Z10_FEATURES
165 prompt "Processor type"
169 bool "System/390 model G5 and G6"
172 Select this to build a 31 bit kernel that works
173 on all ESA/390 and z/Architecture machines.
176 bool "IBM zSeries model z800 and z900"
177 select HAVE_MARCH_Z900_FEATURES if 64BIT
179 Select this to enable optimizations for model z800/z900 (2064 and
180 2066 series). This will enable some optimizations that are not
181 available on older ESA/390 (31 Bit) only CPUs.
184 bool "IBM zSeries model z890 and z990"
185 select HAVE_MARCH_Z990_FEATURES if 64BIT
187 Select this to enable optimizations for model z890/z990 (2084 and
188 2086 series). The kernel will be slightly faster but will not work
193 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
195 Select this to enable optimizations for IBM System z9 (2094 and
196 2096 series). The kernel will be slightly faster but will not work
200 bool "IBM System z10"
201 select HAVE_MARCH_Z10_FEATURES if 64BIT
203 Select this to enable optimizations for IBM System z10 (2097 and
204 2098 series). The kernel will be slightly faster but will not work
208 bool "IBM zEnterprise 114 and 196"
209 select HAVE_MARCH_Z196_FEATURES if 64BIT
211 Select this to enable optimizations for IBM zEnterprise 114 and 196
212 (2818 and 2817 series). The kernel will be slightly faster but will
213 not work on older machines.
219 prompt "64 bit kernel"
221 Select this option if you have an IBM z/Architecture machine
222 and want to use the 64 bit addressing mode.
229 prompt "Kernel support for 31 bit emulation"
231 select COMPAT_BINFMT_ELF if BINFMT_ELF
232 select ARCH_WANT_OLD_COMPAT_IPC
234 Select this option if you want to enable your system kernel to
235 handle system-calls from ELF binaries for 31 bit ESA. This option
236 (and some other stuff like libraries and such) is needed for
237 executing 31 bit applications. It is safe to say "Y".
239 config SYSVIPC_COMPAT
240 def_bool y if COMPAT && SYSVIPC
243 def_bool y if COMPAT && KEYS
247 prompt "Symmetric multi-processing support"
249 This enables support for systems with more than one CPU. If you have
250 a system with only one CPU, like most personal computers, say N. If
251 you have a system with more than one CPU, say Y.
253 If you say N here, the kernel will run on single and multiprocessor
254 machines, but will use only one CPU of a multiprocessor machine. If
255 you say Y here, the kernel will run on many, but not all,
256 singleprocessor machines. On a singleprocessor machine, the kernel
257 will run faster if you say N here.
259 See also the SMP-HOWTO available at
260 <http://www.tldp.org/docs.html#howto>.
262 Even if you don't know what to do here, say Y.
265 int "Maximum number of CPUs (2-64)"
268 default "32" if !64BIT
269 default "64" if 64BIT
271 This allows you to specify the maximum number of CPUs which this
272 kernel will support. The maximum supported value is 64 and the
273 minimum value which makes sense is 2.
275 This is purely to save memory - each supported CPU adds
276 approximately sixteen kilobytes to the kernel image.
280 prompt "Support for hot-pluggable CPUs"
284 Say Y here to be able to turn CPUs off and on. CPUs
285 can be controlled through /sys/devices/system/cpu/cpu#.
286 Say N if you want to disable CPU hotplug.
293 prompt "Book scheduler support"
297 Book scheduler support improves the CPU scheduler's decision making
298 when dealing with machines that have several books.
300 source kernel/Kconfig.preempt
304 prompt "IEEE FPU emulation"
307 This option is required for IEEE compliant floating point arithmetic
308 on older ESA/390 machines. Say Y unless you know your machine doesn't
311 source kernel/Kconfig.hz
317 config ARCH_SPARSEMEM_ENABLE
319 select SPARSEMEM_VMEMMAP_ENABLE
320 select SPARSEMEM_VMEMMAP
321 select SPARSEMEM_STATIC if !64BIT
323 config ARCH_SPARSEMEM_DEFAULT
326 config ARCH_SELECT_MEMORY_MODEL
329 config ARCH_ENABLE_MEMORY_HOTPLUG
330 def_bool y if SPARSEMEM
332 config ARCH_ENABLE_MEMORY_HOTREMOVE
335 config FORCE_MAX_ZONEORDER
343 prompt "Pack kernel stack"
345 This option enables the compiler option -mkernel-backchain if it
346 is available. If the option is available the compiler supports
347 the new stack layout which dramatically reduces the minimum stack
348 frame size. With an old compiler a non-leaf function needs a
349 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
350 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
351 and 24 byte on 64 bit.
353 Say Y if you are unsure.
357 prompt "Use 8kb for kernel stack instead of 16kb"
358 depends on PACK_STACK && 64BIT && !LOCKDEP
360 If you say Y here and the compiler supports the -mkernel-backchain
361 option the kernel will use a smaller kernel stack size. The reduced
362 size is 8kb instead of 16kb. This allows to run more threads on a
363 system and reduces the pressure on the memory management for higher
364 order page allocations.
366 Say N if you are unsure.
370 prompt "Detect kernel stack overflow"
372 This option enables the compiler option -mstack-guard and
373 -mstack-size if they are available. If the compiler supports them
374 it will emit additional code to each function prolog to trigger
375 an illegal operation if the kernel stack is about to overflow.
377 Say N if you are unsure.
380 int "Size of the guard area (128-1024)"
382 depends on CHECK_STACK
385 This allows you to specify the size of the guard area at the lower
386 end of the kernel stack. If the kernel stack points into the guard
387 area on function entry an illegal operation is triggered. The size
388 needs to be a power of 2. Please keep in mind that the size of an
389 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
390 The minimum size for the stack guard should be 256 for 31 bit and
393 config WARN_DYNAMIC_STACK
395 prompt "Emit compiler warnings for function with dynamic stack usage"
397 This option enables the compiler option -mwarn-dynamicstack. If the
398 compiler supports this options generates warnings for functions
399 that dynamically allocate stack space using alloca.
401 Say N if you are unsure.
409 prompt "QDIO support"
411 This driver provides the Queued Direct I/O base support for
414 To compile this driver as a module, choose M here: the
415 module will be called qdio.
421 prompt "Support for CHSC subchannels"
423 This driver allows usage of CHSC subchannels. A CHSC subchannel
424 is usually present on LPAR only.
425 The driver creates a device /dev/chsc, which may be used to
426 obtain I/O configuration information about the machine and
427 to issue asynchronous chsc commands (DANGEROUS).
428 You will usually only want to use this interface on a special
429 LPAR designated for system management.
431 To compile this driver as a module, choose M here: the
432 module will be called chsc_sch.
439 prompt "SCM bus driver"
441 Bus driver for Storage Class Memory.
445 prompt "Support for EADM subchannels"
448 This driver allows usage of EADM subchannels. EADM subchannels act
449 as a communication vehicle for SCM increments.
451 To compile this driver as a module, choose M here: the
452 module will be called eadm_sch.
459 bool "kernel crash dumps"
460 depends on 64BIT && SMP
463 Generate crash dump after being started by kexec.
464 Crash dump kernels are loaded in the main kernel with kexec-tools
465 into a specially reserved region and then later executed after
466 a crash by kdump/kexec.
467 For more details see Documentation/kdump/kdump.txt
471 prompt "zfcpdump support"
474 Select this option if you want to build an zfcpdump enabled kernel.
475 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
479 menu "Executable file formats / Emulations"
481 source "fs/Kconfig.binfmt"
485 prompt "Enable seccomp to safely compute untrusted bytecode"
488 This kernel feature is useful for number crunching applications
489 that may need to compute untrusted bytecode during their
490 execution. By using pipes or other transports made available to
491 the process as file descriptors supporting the read/write
492 syscalls, it's possible to isolate those applications in
493 their own address space using seccomp. Once seccomp is
494 enabled via /proc/<pid>/seccomp, it cannot be disabled
495 and the task is only allowed to execute a few safe syscalls
496 defined by each seccomp mode.
502 menu "Power Management"
504 config ARCH_HIBERNATION_POSSIBLE
507 source "kernel/power/Kconfig"
519 source "drivers/Kconfig"
523 source "arch/s390/Kconfig.debug"
525 source "security/Kconfig"
527 source "crypto/Kconfig"
531 menu "Virtualization"
535 prompt "Pseudo page fault support"
537 Select this option, if you want to use PFAULT pseudo page fault
538 handling under VM. If running native or in LPAR, this option
539 has no effect. If your VM does not support PFAULT, PAGEEX
540 pseudo page fault handling will be used.
541 Note that VM 4.2 supports PFAULT but has a bug in its
542 implementation that causes some problems.
543 Everybody who wants to run Linux under VM != VM4.2 should select
547 bool "VM shared kernel support"
548 depends on !JUMP_LABEL
550 Select this option, if you want to share the text segment of the
551 Linux kernel between different VM guests. This reduces memory
552 usage with lots of guests but greatly increases kernel size.
553 Also if a kernel was IPL'ed from a shared segment the kexec system
555 You should only select this option if you know what you are
556 doing and want to exploit this feature.
560 prompt "Cooperative memory management"
562 Select this option, if you want to enable the kernel interface
563 to reduce the memory size of the system. This is accomplished
564 by allocating pages of memory and put them "on hold". This only
565 makes sense for a system running under VM where the unused pages
566 will be reused by VM for other guest systems. The interface
567 allows an external monitor to balance memory of many systems.
568 Everybody who wants to run Linux under VM should select this
573 prompt "IUCV special message interface to cooperative memory management"
574 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
576 Select this option to enable the special message interface to
577 the cooperative memory management.
581 prompt "Linux - VM Monitor Stream, base infrastructure"
584 This provides a kernel interface for creating and updating z/VM APPLDATA
585 monitor records. The monitor records are updated at certain time
586 intervals, once the timer is started.
587 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
588 i.e. enables or disables monitoring on the Linux side.
589 A custom interval value (in seconds) can be written to
590 /proc/appldata/interval.
592 Defaults are 60 seconds interval and timer off.
593 The /proc entries can also be read from, showing the current settings.
597 prompt "Monitor memory management statistics"
598 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
600 This provides memory management related data to the Linux - VM Monitor
601 Stream, like paging/swapping rate, memory utilisation, etc.
602 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
603 APPLDATA monitor record, i.e. enables or disables monitoring this record
607 The /proc entry can also be read from, showing the current settings.
609 This can also be compiled as a module, which will be called
614 prompt "Monitor OS statistics"
615 depends on APPLDATA_BASE
617 This provides OS related data to the Linux - VM Monitor Stream, like
618 CPU utilisation, etc.
619 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
620 APPLDATA monitor record, i.e. enables or disables monitoring this record
624 This can also be compiled as a module, which will be called
627 config APPLDATA_NET_SUM
629 prompt "Monitor overall network statistics"
630 depends on APPLDATA_BASE && NET
632 This provides network related data to the Linux - VM Monitor Stream,
633 currently there is only a total sum of network I/O statistics, no
635 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
636 APPLDATA monitor record, i.e. enables or disables monitoring this record
640 This can also be compiled as a module, which will be called
645 prompt "s390 hypervisor file system support"
646 select SYS_HYPERVISOR
648 This is a virtual file system intended to provide accounting
649 information in an s390 hypervisor environment.
651 source "arch/s390/kvm/Kconfig"
655 prompt "s390 support for virtio devices (EXPERIMENTAL)"
656 depends on 64BIT && EXPERIMENTAL
657 select VIRTUALIZATION
659 select VIRTIO_CONSOLE
661 Enabling this option adds support for virtio based paravirtual device
664 Select this option if you want to run the kernel as a guest under