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
135 select HAVE_MOD_ARCH_SPECIFIC
136 select MODULES_USE_ELF_RELA
138 config SCHED_OMIT_FRAME_POINTER
141 source "init/Kconfig"
143 source "kernel/Kconfig.freezer"
145 menu "Processor type and features"
147 config HAVE_MARCH_Z900_FEATURES
150 config HAVE_MARCH_Z990_FEATURES
152 select HAVE_MARCH_Z900_FEATURES
154 config HAVE_MARCH_Z9_109_FEATURES
156 select HAVE_MARCH_Z990_FEATURES
158 config HAVE_MARCH_Z10_FEATURES
160 select HAVE_MARCH_Z9_109_FEATURES
162 config HAVE_MARCH_Z196_FEATURES
164 select HAVE_MARCH_Z10_FEATURES
167 prompt "Processor type"
171 bool "System/390 model G5 and G6"
174 Select this to build a 31 bit kernel that works
175 on all ESA/390 and z/Architecture machines.
178 bool "IBM zSeries model z800 and z900"
179 select HAVE_MARCH_Z900_FEATURES if 64BIT
181 Select this to enable optimizations for model z800/z900 (2064 and
182 2066 series). This will enable some optimizations that are not
183 available on older ESA/390 (31 Bit) only CPUs.
186 bool "IBM zSeries model z890 and z990"
187 select HAVE_MARCH_Z990_FEATURES if 64BIT
189 Select this to enable optimizations for model z890/z990 (2084 and
190 2086 series). The kernel will be slightly faster but will not work
195 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
197 Select this to enable optimizations for IBM System z9 (2094 and
198 2096 series). The kernel will be slightly faster but will not work
202 bool "IBM System z10"
203 select HAVE_MARCH_Z10_FEATURES if 64BIT
205 Select this to enable optimizations for IBM System z10 (2097 and
206 2098 series). The kernel will be slightly faster but will not work
210 bool "IBM zEnterprise 114 and 196"
211 select HAVE_MARCH_Z196_FEATURES if 64BIT
213 Select this to enable optimizations for IBM zEnterprise 114 and 196
214 (2818 and 2817 series). The kernel will be slightly faster but will
215 not work on older machines.
221 prompt "64 bit kernel"
223 Select this option if you have an IBM z/Architecture machine
224 and want to use the 64 bit addressing mode.
231 prompt "Kernel support for 31 bit emulation"
233 select COMPAT_BINFMT_ELF if BINFMT_ELF
234 select ARCH_WANT_OLD_COMPAT_IPC
236 Select this option if you want to enable your system kernel to
237 handle system-calls from ELF binaries for 31 bit ESA. This option
238 (and some other stuff like libraries and such) is needed for
239 executing 31 bit applications. It is safe to say "Y".
241 config SYSVIPC_COMPAT
242 def_bool y if COMPAT && SYSVIPC
245 def_bool y if COMPAT && KEYS
249 prompt "Symmetric multi-processing support"
251 This enables support for systems with more than one CPU. If you have
252 a system with only one CPU, like most personal computers, say N. If
253 you have a system with more than one CPU, say Y.
255 If you say N here, the kernel will run on single and multiprocessor
256 machines, but will use only one CPU of a multiprocessor machine. If
257 you say Y here, the kernel will run on many, but not all,
258 singleprocessor machines. On a singleprocessor machine, the kernel
259 will run faster if you say N here.
261 See also the SMP-HOWTO available at
262 <http://www.tldp.org/docs.html#howto>.
264 Even if you don't know what to do here, say Y.
267 int "Maximum number of CPUs (2-64)"
270 default "32" if !64BIT
271 default "64" if 64BIT
273 This allows you to specify the maximum number of CPUs which this
274 kernel will support. The maximum supported value is 64 and the
275 minimum value which makes sense is 2.
277 This is purely to save memory - each supported CPU adds
278 approximately sixteen kilobytes to the kernel image.
282 prompt "Support for hot-pluggable CPUs"
286 Say Y here to be able to turn CPUs off and on. CPUs
287 can be controlled through /sys/devices/system/cpu/cpu#.
288 Say N if you want to disable CPU hotplug.
295 prompt "Book scheduler support"
299 Book scheduler support improves the CPU scheduler's decision making
300 when dealing with machines that have several books.
302 source kernel/Kconfig.preempt
306 prompt "IEEE FPU emulation"
309 This option is required for IEEE compliant floating point arithmetic
310 on older ESA/390 machines. Say Y unless you know your machine doesn't
313 source kernel/Kconfig.hz
319 config ARCH_SPARSEMEM_ENABLE
321 select SPARSEMEM_VMEMMAP_ENABLE
322 select SPARSEMEM_VMEMMAP
323 select SPARSEMEM_STATIC if !64BIT
325 config ARCH_SPARSEMEM_DEFAULT
328 config ARCH_SELECT_MEMORY_MODEL
331 config ARCH_ENABLE_MEMORY_HOTPLUG
332 def_bool y if SPARSEMEM
334 config ARCH_ENABLE_MEMORY_HOTREMOVE
337 config FORCE_MAX_ZONEORDER
345 prompt "Pack kernel stack"
347 This option enables the compiler option -mkernel-backchain if it
348 is available. If the option is available the compiler supports
349 the new stack layout which dramatically reduces the minimum stack
350 frame size. With an old compiler a non-leaf function needs a
351 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
352 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
353 and 24 byte on 64 bit.
355 Say Y if you are unsure.
359 prompt "Use 8kb for kernel stack instead of 16kb"
360 depends on PACK_STACK && 64BIT && !LOCKDEP
362 If you say Y here and the compiler supports the -mkernel-backchain
363 option the kernel will use a smaller kernel stack size. The reduced
364 size is 8kb instead of 16kb. This allows to run more threads on a
365 system and reduces the pressure on the memory management for higher
366 order page allocations.
368 Say N if you are unsure.
372 prompt "Detect kernel stack overflow"
374 This option enables the compiler option -mstack-guard and
375 -mstack-size if they are available. If the compiler supports them
376 it will emit additional code to each function prolog to trigger
377 an illegal operation if the kernel stack is about to overflow.
379 Say N if you are unsure.
382 int "Size of the guard area (128-1024)"
384 depends on CHECK_STACK
387 This allows you to specify the size of the guard area at the lower
388 end of the kernel stack. If the kernel stack points into the guard
389 area on function entry an illegal operation is triggered. The size
390 needs to be a power of 2. Please keep in mind that the size of an
391 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
392 The minimum size for the stack guard should be 256 for 31 bit and
395 config WARN_DYNAMIC_STACK
397 prompt "Emit compiler warnings for function with dynamic stack usage"
399 This option enables the compiler option -mwarn-dynamicstack. If the
400 compiler supports this options generates warnings for functions
401 that dynamically allocate stack space using alloca.
403 Say N if you are unsure.
411 prompt "QDIO support"
413 This driver provides the Queued Direct I/O base support for
416 To compile this driver as a module, choose M here: the
417 module will be called qdio.
423 prompt "Support for CHSC subchannels"
425 This driver allows usage of CHSC subchannels. A CHSC subchannel
426 is usually present on LPAR only.
427 The driver creates a device /dev/chsc, which may be used to
428 obtain I/O configuration information about the machine and
429 to issue asynchronous chsc commands (DANGEROUS).
430 You will usually only want to use this interface on a special
431 LPAR designated for system management.
433 To compile this driver as a module, choose M here: the
434 module will be called chsc_sch.
441 prompt "SCM bus driver"
443 Bus driver for Storage Class Memory.
447 prompt "Support for EADM subchannels"
450 This driver allows usage of EADM subchannels. EADM subchannels act
451 as a communication vehicle for SCM increments.
453 To compile this driver as a module, choose M here: the
454 module will be called eadm_sch.
461 bool "kernel crash dumps"
462 depends on 64BIT && SMP
465 Generate crash dump after being started by kexec.
466 Crash dump kernels are loaded in the main kernel with kexec-tools
467 into a specially reserved region and then later executed after
468 a crash by kdump/kexec.
469 For more details see Documentation/kdump/kdump.txt
473 prompt "zfcpdump support"
476 Select this option if you want to build an zfcpdump enabled kernel.
477 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
481 menu "Executable file formats / Emulations"
483 source "fs/Kconfig.binfmt"
487 prompt "Enable seccomp to safely compute untrusted bytecode"
490 This kernel feature is useful for number crunching applications
491 that may need to compute untrusted bytecode during their
492 execution. By using pipes or other transports made available to
493 the process as file descriptors supporting the read/write
494 syscalls, it's possible to isolate those applications in
495 their own address space using seccomp. Once seccomp is
496 enabled via /proc/<pid>/seccomp, it cannot be disabled
497 and the task is only allowed to execute a few safe syscalls
498 defined by each seccomp mode.
504 menu "Power Management"
506 config ARCH_HIBERNATION_POSSIBLE
509 source "kernel/power/Kconfig"
521 source "drivers/Kconfig"
525 source "arch/s390/Kconfig.debug"
527 source "security/Kconfig"
529 source "crypto/Kconfig"
533 menu "Virtualization"
537 prompt "Pseudo page fault support"
539 Select this option, if you want to use PFAULT pseudo page fault
540 handling under VM. If running native or in LPAR, this option
541 has no effect. If your VM does not support PFAULT, PAGEEX
542 pseudo page fault handling will be used.
543 Note that VM 4.2 supports PFAULT but has a bug in its
544 implementation that causes some problems.
545 Everybody who wants to run Linux under VM != VM4.2 should select
549 bool "VM shared kernel support"
550 depends on !JUMP_LABEL
552 Select this option, if you want to share the text segment of the
553 Linux kernel between different VM guests. This reduces memory
554 usage with lots of guests but greatly increases kernel size.
555 Also if a kernel was IPL'ed from a shared segment the kexec system
557 You should only select this option if you know what you are
558 doing and want to exploit this feature.
562 prompt "Cooperative memory management"
564 Select this option, if you want to enable the kernel interface
565 to reduce the memory size of the system. This is accomplished
566 by allocating pages of memory and put them "on hold". This only
567 makes sense for a system running under VM where the unused pages
568 will be reused by VM for other guest systems. The interface
569 allows an external monitor to balance memory of many systems.
570 Everybody who wants to run Linux under VM should select this
575 prompt "IUCV special message interface to cooperative memory management"
576 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
578 Select this option to enable the special message interface to
579 the cooperative memory management.
583 prompt "Linux - VM Monitor Stream, base infrastructure"
586 This provides a kernel interface for creating and updating z/VM APPLDATA
587 monitor records. The monitor records are updated at certain time
588 intervals, once the timer is started.
589 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
590 i.e. enables or disables monitoring on the Linux side.
591 A custom interval value (in seconds) can be written to
592 /proc/appldata/interval.
594 Defaults are 60 seconds interval and timer off.
595 The /proc entries can also be read from, showing the current settings.
599 prompt "Monitor memory management statistics"
600 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
602 This provides memory management related data to the Linux - VM Monitor
603 Stream, like paging/swapping rate, memory utilisation, etc.
604 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
605 APPLDATA monitor record, i.e. enables or disables monitoring this record
609 The /proc entry can also be read from, showing the current settings.
611 This can also be compiled as a module, which will be called
616 prompt "Monitor OS statistics"
617 depends on APPLDATA_BASE
619 This provides OS related data to the Linux - VM Monitor Stream, like
620 CPU utilisation, etc.
621 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
622 APPLDATA monitor record, i.e. enables or disables monitoring this record
626 This can also be compiled as a module, which will be called
629 config APPLDATA_NET_SUM
631 prompt "Monitor overall network statistics"
632 depends on APPLDATA_BASE && NET
634 This provides network related data to the Linux - VM Monitor Stream,
635 currently there is only a total sum of network I/O statistics, no
637 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
638 APPLDATA monitor record, i.e. enables or disables monitoring this record
642 This can also be compiled as a module, which will be called
647 prompt "s390 hypervisor file system support"
648 select SYS_HYPERVISOR
650 This is a virtual file system intended to provide accounting
651 information in an s390 hypervisor environment.
653 source "arch/s390/kvm/Kconfig"
657 prompt "s390 support for virtio devices (EXPERIMENTAL)"
658 depends on 64BIT && EXPERIMENTAL
659 select VIRTUALIZATION
662 select VIRTIO_CONSOLE
664 Enabling this option adds support for virtio based paravirtual device
667 Select this option if you want to run the kernel as a guest under