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 HAVE_MOD_ARCH_SPECIFIC
142 select MODULES_USE_ELF_RELA
144 config SCHED_OMIT_FRAME_POINTER
147 source "init/Kconfig"
149 source "kernel/Kconfig.freezer"
151 menu "Processor type and features"
153 config HAVE_MARCH_Z900_FEATURES
156 config HAVE_MARCH_Z990_FEATURES
158 select HAVE_MARCH_Z900_FEATURES
160 config HAVE_MARCH_Z9_109_FEATURES
162 select HAVE_MARCH_Z990_FEATURES
164 config HAVE_MARCH_Z10_FEATURES
166 select HAVE_MARCH_Z9_109_FEATURES
168 config HAVE_MARCH_Z196_FEATURES
170 select HAVE_MARCH_Z10_FEATURES
173 prompt "Processor type"
177 bool "System/390 model G5 and G6"
180 Select this to build a 31 bit kernel that works
181 on all ESA/390 and z/Architecture machines.
184 bool "IBM zSeries model z800 and z900"
185 select HAVE_MARCH_Z900_FEATURES if 64BIT
187 Select this to enable optimizations for model z800/z900 (2064 and
188 2066 series). This will enable some optimizations that are not
189 available on older ESA/390 (31 Bit) only CPUs.
192 bool "IBM zSeries model z890 and z990"
193 select HAVE_MARCH_Z990_FEATURES if 64BIT
195 Select this to enable optimizations for model z890/z990 (2084 and
196 2086 series). The kernel will be slightly faster but will not work
201 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
203 Select this to enable optimizations for IBM System z9 (2094 and
204 2096 series). The kernel will be slightly faster but will not work
208 bool "IBM System z10"
209 select HAVE_MARCH_Z10_FEATURES if 64BIT
211 Select this to enable optimizations for IBM System z10 (2097 and
212 2098 series). The kernel will be slightly faster but will not work
216 bool "IBM zEnterprise 114 and 196"
217 select HAVE_MARCH_Z196_FEATURES if 64BIT
219 Select this to enable optimizations for IBM zEnterprise 114 and 196
220 (2818 and 2817 series). The kernel will be slightly faster but will
221 not work on older machines.
227 prompt "64 bit kernel"
229 Select this option if you have an IBM z/Architecture machine
230 and want to use the 64 bit addressing mode.
237 prompt "Kernel support for 31 bit emulation"
239 select COMPAT_BINFMT_ELF if BINFMT_ELF
240 select ARCH_WANT_OLD_COMPAT_IPC
242 Select this option if you want to enable your system kernel to
243 handle system-calls from ELF binaries for 31 bit ESA. This option
244 (and some other stuff like libraries and such) is needed for
245 executing 31 bit applications. It is safe to say "Y".
247 config SYSVIPC_COMPAT
248 def_bool y if COMPAT && SYSVIPC
251 def_bool y if COMPAT && KEYS
255 prompt "Symmetric multi-processing support"
257 This enables support for systems with more than one CPU. If you have
258 a system with only one CPU, like most personal computers, say N. If
259 you have a system with more than one CPU, say Y.
261 If you say N here, the kernel will run on single and multiprocessor
262 machines, but will use only one CPU of a multiprocessor machine. If
263 you say Y here, the kernel will run on many, but not all,
264 singleprocessor machines. On a singleprocessor machine, the kernel
265 will run faster if you say N here.
267 See also the SMP-HOWTO available at
268 <http://www.tldp.org/docs.html#howto>.
270 Even if you don't know what to do here, say Y.
273 int "Maximum number of CPUs (2-64)"
276 default "32" if !64BIT
277 default "64" if 64BIT
279 This allows you to specify the maximum number of CPUs which this
280 kernel will support. The maximum supported value is 64 and the
281 minimum value which makes sense is 2.
283 This is purely to save memory - each supported CPU adds
284 approximately sixteen kilobytes to the kernel image.
288 prompt "Support for hot-pluggable CPUs"
292 Say Y here to be able to turn CPUs off and on. CPUs
293 can be controlled through /sys/devices/system/cpu/cpu#.
294 Say N if you want to disable CPU hotplug.
301 prompt "Book scheduler support"
305 Book scheduler support improves the CPU scheduler's decision making
306 when dealing with machines that have several books.
308 source kernel/Kconfig.preempt
312 prompt "IEEE FPU emulation"
315 This option is required for IEEE compliant floating point arithmetic
316 on older ESA/390 machines. Say Y unless you know your machine doesn't
319 source kernel/Kconfig.hz
325 config ARCH_SPARSEMEM_ENABLE
327 select SPARSEMEM_VMEMMAP_ENABLE
328 select SPARSEMEM_VMEMMAP
329 select SPARSEMEM_STATIC if !64BIT
331 config ARCH_SPARSEMEM_DEFAULT
334 config ARCH_SELECT_MEMORY_MODEL
337 config ARCH_ENABLE_MEMORY_HOTPLUG
338 def_bool y if SPARSEMEM
340 config ARCH_ENABLE_MEMORY_HOTREMOVE
343 config FORCE_MAX_ZONEORDER
351 prompt "Pack kernel stack"
353 This option enables the compiler option -mkernel-backchain if it
354 is available. If the option is available the compiler supports
355 the new stack layout which dramatically reduces the minimum stack
356 frame size. With an old compiler a non-leaf function needs a
357 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
358 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
359 and 24 byte on 64 bit.
361 Say Y if you are unsure.
365 prompt "Use 8kb for kernel stack instead of 16kb"
366 depends on PACK_STACK && 64BIT && !LOCKDEP
368 If you say Y here and the compiler supports the -mkernel-backchain
369 option the kernel will use a smaller kernel stack size. The reduced
370 size is 8kb instead of 16kb. This allows to run more threads on a
371 system and reduces the pressure on the memory management for higher
372 order page allocations.
374 Say N if you are unsure.
378 prompt "Detect kernel stack overflow"
380 This option enables the compiler option -mstack-guard and
381 -mstack-size if they are available. If the compiler supports them
382 it will emit additional code to each function prolog to trigger
383 an illegal operation if the kernel stack is about to overflow.
385 Say N if you are unsure.
388 int "Size of the guard area (128-1024)"
390 depends on CHECK_STACK
393 This allows you to specify the size of the guard area at the lower
394 end of the kernel stack. If the kernel stack points into the guard
395 area on function entry an illegal operation is triggered. The size
396 needs to be a power of 2. Please keep in mind that the size of an
397 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
398 The minimum size for the stack guard should be 256 for 31 bit and
401 config WARN_DYNAMIC_STACK
403 prompt "Emit compiler warnings for function with dynamic stack usage"
405 This option enables the compiler option -mwarn-dynamicstack. If the
406 compiler supports this options generates warnings for functions
407 that dynamically allocate stack space using alloca.
409 Say N if you are unsure.
417 prompt "QDIO support"
419 This driver provides the Queued Direct I/O base support for
422 To compile this driver as a module, choose M here: the
423 module will be called qdio.
429 prompt "Support for CHSC subchannels"
431 This driver allows usage of CHSC subchannels. A CHSC subchannel
432 is usually present on LPAR only.
433 The driver creates a device /dev/chsc, which may be used to
434 obtain I/O configuration information about the machine and
435 to issue asynchronous chsc commands (DANGEROUS).
436 You will usually only want to use this interface on a special
437 LPAR designated for system management.
439 To compile this driver as a module, choose M here: the
440 module will be called chsc_sch.
447 prompt "SCM bus driver"
449 Bus driver for Storage Class Memory.
453 prompt "Support for EADM subchannels"
456 This driver allows usage of EADM subchannels. EADM subchannels act
457 as a communication vehicle for SCM increments.
459 To compile this driver as a module, choose M here: the
460 module will be called eadm_sch.
467 bool "kernel crash dumps"
468 depends on 64BIT && SMP
471 Generate crash dump after being started by kexec.
472 Crash dump kernels are loaded in the main kernel with kexec-tools
473 into a specially reserved region and then later executed after
474 a crash by kdump/kexec.
475 For more details see Documentation/kdump/kdump.txt
479 prompt "zfcpdump support"
482 Select this option if you want to build an zfcpdump enabled kernel.
483 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
487 menu "Executable file formats / Emulations"
489 source "fs/Kconfig.binfmt"
493 prompt "Enable seccomp to safely compute untrusted bytecode"
496 This kernel feature is useful for number crunching applications
497 that may need to compute untrusted bytecode during their
498 execution. By using pipes or other transports made available to
499 the process as file descriptors supporting the read/write
500 syscalls, it's possible to isolate those applications in
501 their own address space using seccomp. Once seccomp is
502 enabled via /proc/<pid>/seccomp, it cannot be disabled
503 and the task is only allowed to execute a few safe syscalls
504 defined by each seccomp mode.
510 menu "Power Management"
512 config ARCH_HIBERNATION_POSSIBLE
515 source "kernel/power/Kconfig"
527 source "drivers/Kconfig"
531 source "arch/s390/Kconfig.debug"
533 source "security/Kconfig"
535 source "crypto/Kconfig"
539 menu "Virtualization"
543 prompt "Pseudo page fault support"
545 Select this option, if you want to use PFAULT pseudo page fault
546 handling under VM. If running native or in LPAR, this option
547 has no effect. If your VM does not support PFAULT, PAGEEX
548 pseudo page fault handling will be used.
549 Note that VM 4.2 supports PFAULT but has a bug in its
550 implementation that causes some problems.
551 Everybody who wants to run Linux under VM != VM4.2 should select
555 bool "VM shared kernel support"
556 depends on !JUMP_LABEL
558 Select this option, if you want to share the text segment of the
559 Linux kernel between different VM guests. This reduces memory
560 usage with lots of guests but greatly increases kernel size.
561 Also if a kernel was IPL'ed from a shared segment the kexec system
563 You should only select this option if you know what you are
564 doing and want to exploit this feature.
568 prompt "Cooperative memory management"
570 Select this option, if you want to enable the kernel interface
571 to reduce the memory size of the system. This is accomplished
572 by allocating pages of memory and put them "on hold". This only
573 makes sense for a system running under VM where the unused pages
574 will be reused by VM for other guest systems. The interface
575 allows an external monitor to balance memory of many systems.
576 Everybody who wants to run Linux under VM should select this
581 prompt "IUCV special message interface to cooperative memory management"
582 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
584 Select this option to enable the special message interface to
585 the cooperative memory management.
589 prompt "Linux - VM Monitor Stream, base infrastructure"
592 This provides a kernel interface for creating and updating z/VM APPLDATA
593 monitor records. The monitor records are updated at certain time
594 intervals, once the timer is started.
595 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
596 i.e. enables or disables monitoring on the Linux side.
597 A custom interval value (in seconds) can be written to
598 /proc/appldata/interval.
600 Defaults are 60 seconds interval and timer off.
601 The /proc entries can also be read from, showing the current settings.
605 prompt "Monitor memory management statistics"
606 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
608 This provides memory management related data to the Linux - VM Monitor
609 Stream, like paging/swapping rate, memory utilisation, etc.
610 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
611 APPLDATA monitor record, i.e. enables or disables monitoring this record
615 The /proc entry can also be read from, showing the current settings.
617 This can also be compiled as a module, which will be called
622 prompt "Monitor OS statistics"
623 depends on APPLDATA_BASE
625 This provides OS related data to the Linux - VM Monitor Stream, like
626 CPU utilisation, etc.
627 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
628 APPLDATA monitor record, i.e. enables or disables monitoring this record
632 This can also be compiled as a module, which will be called
635 config APPLDATA_NET_SUM
637 prompt "Monitor overall network statistics"
638 depends on APPLDATA_BASE && NET
640 This provides network related data to the Linux - VM Monitor Stream,
641 currently there is only a total sum of network I/O statistics, no
643 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
644 APPLDATA monitor record, i.e. enables or disables monitoring this record
648 This can also be compiled as a module, which will be called
653 prompt "s390 hypervisor file system support"
654 select SYS_HYPERVISOR
656 This is a virtual file system intended to provide accounting
657 information in an s390 hypervisor environment.
659 source "arch/s390/kvm/Kconfig"
663 prompt "s390 support for virtio devices (EXPERIMENTAL)"
664 depends on 64BIT && EXPERIMENTAL
665 select VIRTUALIZATION
667 select VIRTIO_CONSOLE
669 Enabling this option adds support for virtio based paravirtual device
672 Select this option if you want to run the kernel as a guest under