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
37 config ARCH_DMA_ADDR_T_64BIT
40 config GENERIC_LOCKBREAK
41 def_bool y if SMP && PREEMPT
46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
63 select ARCH_DISCARD_MEMBLOCK
64 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
65 select ARCH_HAVE_NMI_SAFE_CMPXCHG
66 select ARCH_INLINE_READ_LOCK
67 select ARCH_INLINE_READ_LOCK_BH
68 select ARCH_INLINE_READ_LOCK_IRQ
69 select ARCH_INLINE_READ_LOCK_IRQSAVE
70 select ARCH_INLINE_READ_TRYLOCK
71 select ARCH_INLINE_READ_UNLOCK
72 select ARCH_INLINE_READ_UNLOCK_BH
73 select ARCH_INLINE_READ_UNLOCK_IRQ
74 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
75 select ARCH_INLINE_SPIN_LOCK
76 select ARCH_INLINE_SPIN_LOCK_BH
77 select ARCH_INLINE_SPIN_LOCK_IRQ
78 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
79 select ARCH_INLINE_SPIN_TRYLOCK
80 select ARCH_INLINE_SPIN_TRYLOCK_BH
81 select ARCH_INLINE_SPIN_UNLOCK
82 select ARCH_INLINE_SPIN_UNLOCK_BH
83 select ARCH_INLINE_SPIN_UNLOCK_IRQ
84 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_WRITE_LOCK
86 select ARCH_INLINE_WRITE_LOCK_BH
87 select ARCH_INLINE_WRITE_LOCK_IRQ
88 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
89 select ARCH_INLINE_WRITE_TRYLOCK
90 select ARCH_INLINE_WRITE_UNLOCK
91 select ARCH_INLINE_WRITE_UNLOCK_BH
92 select ARCH_INLINE_WRITE_UNLOCK_IRQ
93 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
94 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
95 select ARCH_WANT_IPC_PARSE_VERSION
96 select BUILDTIME_EXTABLE_SORT
97 select CLONE_BACKWARDS2
98 select GENERIC_CLOCKEVENTS
99 select GENERIC_CPU_DEVICES if !SMP
100 select GENERIC_KERNEL_THREAD
101 select GENERIC_SMP_IDLE_THREAD
102 select GENERIC_TIME_VSYSCALL_OLD
103 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
104 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
105 select HAVE_ARCH_MUTEX_CPU_RELAX
106 select HAVE_ARCH_SECCOMP_FILTER
107 select HAVE_ARCH_TRACEHOOK
108 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
109 select HAVE_BPF_JIT if 64BIT && PACK_STACK
110 select HAVE_CMPXCHG_DOUBLE
111 select HAVE_CMPXCHG_LOCAL
112 select HAVE_C_RECORDMCOUNT
113 select HAVE_DEBUG_KMEMLEAK
114 select HAVE_DYNAMIC_FTRACE
115 select HAVE_FTRACE_MCOUNT_RECORD
116 select HAVE_FUNCTION_GRAPH_TRACER
117 select HAVE_FUNCTION_TRACER
118 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
119 select HAVE_KERNEL_BZIP2
120 select HAVE_KERNEL_GZIP
121 select HAVE_KERNEL_LZMA
122 select HAVE_KERNEL_LZO
123 select HAVE_KERNEL_XZ
125 select HAVE_KRETPROBES
126 select HAVE_KVM if 64BIT
128 select HAVE_MEMBLOCK_NODE_MAP
129 select HAVE_MOD_ARCH_SPECIFIC
131 select HAVE_PERF_EVENTS
132 select HAVE_REGS_AND_STACK_ACCESS_API
133 select HAVE_SYSCALL_TRACEPOINTS
134 select HAVE_SYSCALL_WRAPPERS
135 select HAVE_UID16 if 32BIT
136 select HAVE_VIRT_CPU_ACCOUNTING
138 select INIT_ALL_POSSIBLE
139 select KTIME_SCALAR if 32BIT
140 select MODULES_USE_ELF_RELA
141 select OLD_SIGSUSPEND3
143 select SYSCTL_EXCEPTION_TRACE
144 select USE_GENERIC_SMP_HELPERS if SMP
145 select VIRT_CPU_ACCOUNTING
147 config SCHED_OMIT_FRAME_POINTER
150 source "init/Kconfig"
152 source "kernel/Kconfig.freezer"
154 menu "Processor type and features"
156 config HAVE_MARCH_Z900_FEATURES
159 config HAVE_MARCH_Z990_FEATURES
161 select HAVE_MARCH_Z900_FEATURES
163 config HAVE_MARCH_Z9_109_FEATURES
165 select HAVE_MARCH_Z990_FEATURES
167 config HAVE_MARCH_Z10_FEATURES
169 select HAVE_MARCH_Z9_109_FEATURES
171 config HAVE_MARCH_Z196_FEATURES
173 select HAVE_MARCH_Z10_FEATURES
175 config HAVE_MARCH_ZEC12_FEATURES
177 select HAVE_MARCH_Z196_FEATURES
180 prompt "Processor type"
184 bool "System/390 model G5 and G6"
187 Select this to build a 31 bit kernel that works
188 on all ESA/390 and z/Architecture machines.
191 bool "IBM zSeries model z800 and z900"
192 select HAVE_MARCH_Z900_FEATURES if 64BIT
194 Select this to enable optimizations for model z800/z900 (2064 and
195 2066 series). This will enable some optimizations that are not
196 available on older ESA/390 (31 Bit) only CPUs.
199 bool "IBM zSeries model z890 and z990"
200 select HAVE_MARCH_Z990_FEATURES if 64BIT
202 Select this to enable optimizations for model z890/z990 (2084 and
203 2086 series). The kernel will be slightly faster but will not work
208 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
210 Select this to enable optimizations for IBM System z9 (2094 and
211 2096 series). The kernel will be slightly faster but will not work
215 bool "IBM System z10"
216 select HAVE_MARCH_Z10_FEATURES if 64BIT
218 Select this to enable optimizations for IBM System z10 (2097 and
219 2098 series). The kernel will be slightly faster but will not work
223 bool "IBM zEnterprise 114 and 196"
224 select HAVE_MARCH_Z196_FEATURES if 64BIT
226 Select this to enable optimizations for IBM zEnterprise 114 and 196
227 (2818 and 2817 series). The kernel will be slightly faster but will
228 not work on older machines.
232 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
234 Select this to enable optimizations for IBM zEC12 (2827 series). The
235 kernel will be slightly faster but will not work on older machines.
241 prompt "64 bit kernel"
243 Select this option if you have an IBM z/Architecture machine
244 and want to use the 64 bit addressing mode.
251 prompt "Kernel support for 31 bit emulation"
253 select COMPAT_BINFMT_ELF if BINFMT_ELF
254 select ARCH_WANT_OLD_COMPAT_IPC
255 select COMPAT_OLD_SIGACTION
257 Select this option if you want to enable your system kernel to
258 handle system-calls from ELF binaries for 31 bit ESA. This option
259 (and some other stuff like libraries and such) is needed for
260 executing 31 bit applications. It is safe to say "Y".
262 config SYSVIPC_COMPAT
263 def_bool y if COMPAT && SYSVIPC
266 def_bool y if COMPAT && KEYS
270 prompt "Symmetric multi-processing support"
272 This enables support for systems with more than one CPU. If you have
273 a system with only one CPU, like most personal computers, say N. If
274 you have a system with more than one CPU, say Y.
276 If you say N here, the kernel will run on single and multiprocessor
277 machines, but will use only one CPU of a multiprocessor machine. If
278 you say Y here, the kernel will run on many, but not all,
279 singleprocessor machines. On a singleprocessor machine, the kernel
280 will run faster if you say N here.
282 See also the SMP-HOWTO available at
283 <http://www.tldp.org/docs.html#howto>.
285 Even if you don't know what to do here, say Y.
288 int "Maximum number of CPUs (2-64)"
291 default "32" if !64BIT
292 default "64" if 64BIT
294 This allows you to specify the maximum number of CPUs which this
295 kernel will support. The maximum supported value is 64 and the
296 minimum value which makes sense is 2.
298 This is purely to save memory - each supported CPU adds
299 approximately sixteen kilobytes to the kernel image.
303 prompt "Support for hot-pluggable CPUs"
307 Say Y here to be able to turn CPUs off and on. CPUs
308 can be controlled through /sys/devices/system/cpu/cpu#.
309 Say N if you want to disable CPU hotplug.
316 prompt "Book scheduler support"
320 Book scheduler support improves the CPU scheduler's decision making
321 when dealing with machines that have several books.
323 source kernel/Kconfig.preempt
327 prompt "IEEE FPU emulation"
330 This option is required for IEEE compliant floating point arithmetic
331 on older ESA/390 machines. Say Y unless you know your machine doesn't
334 source kernel/Kconfig.hz
340 config ARCH_SPARSEMEM_ENABLE
342 select SPARSEMEM_VMEMMAP_ENABLE
343 select SPARSEMEM_VMEMMAP
344 select SPARSEMEM_STATIC if !64BIT
346 config ARCH_SPARSEMEM_DEFAULT
349 config ARCH_SELECT_MEMORY_MODEL
352 config ARCH_ENABLE_MEMORY_HOTPLUG
353 def_bool y if SPARSEMEM
355 config ARCH_ENABLE_MEMORY_HOTREMOVE
358 config FORCE_MAX_ZONEORDER
366 prompt "Pack kernel stack"
368 This option enables the compiler option -mkernel-backchain if it
369 is available. If the option is available the compiler supports
370 the new stack layout which dramatically reduces the minimum stack
371 frame size. With an old compiler a non-leaf function needs a
372 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
373 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
374 and 24 byte on 64 bit.
376 Say Y if you are unsure.
380 prompt "Use 8kb for kernel stack instead of 16kb"
381 depends on PACK_STACK && 64BIT && !LOCKDEP
383 If you say Y here and the compiler supports the -mkernel-backchain
384 option the kernel will use a smaller kernel stack size. The reduced
385 size is 8kb instead of 16kb. This allows to run more threads on a
386 system and reduces the pressure on the memory management for higher
387 order page allocations.
389 Say N if you are unsure.
393 prompt "Detect kernel stack overflow"
395 This option enables the compiler option -mstack-guard and
396 -mstack-size if they are available. If the compiler supports them
397 it will emit additional code to each function prolog to trigger
398 an illegal operation if the kernel stack is about to overflow.
400 Say N if you are unsure.
403 int "Size of the guard area (128-1024)"
405 depends on CHECK_STACK
408 This allows you to specify the size of the guard area at the lower
409 end of the kernel stack. If the kernel stack points into the guard
410 area on function entry an illegal operation is triggered. The size
411 needs to be a power of 2. Please keep in mind that the size of an
412 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
413 The minimum size for the stack guard should be 256 for 31 bit and
416 config WARN_DYNAMIC_STACK
418 prompt "Emit compiler warnings for function with dynamic stack usage"
420 This option enables the compiler option -mwarn-dynamicstack. If the
421 compiler supports this options generates warnings for functions
422 that dynamically allocate stack space using alloca.
424 Say N if you are unsure.
432 prompt "QDIO support"
434 This driver provides the Queued Direct I/O base support for
437 To compile this driver as a module, choose M here: the
438 module will be called qdio.
446 select ARCH_SUPPORTS_MSI
453 config PCI_NR_FUNCTIONS
454 int "Maximum number of PCI functions (1-4096)"
458 This allows you to specify the maximum number of PCI functions which
459 this kernel will support.
461 source "drivers/pci/Kconfig"
462 source "drivers/pci/pcie/Kconfig"
463 source "drivers/pci/hotplug/Kconfig"
478 select HAVE_DMA_API_DEBUG
480 config NEED_SG_DMA_LENGTH
483 config HAVE_DMA_ATTRS
486 config NEED_DMA_MAP_STATE
491 prompt "Support for CHSC subchannels"
493 This driver allows usage of CHSC subchannels. A CHSC subchannel
494 is usually present on LPAR only.
495 The driver creates a device /dev/chsc, which may be used to
496 obtain I/O configuration information about the machine and
497 to issue asynchronous chsc commands (DANGEROUS).
498 You will usually only want to use this interface on a special
499 LPAR designated for system management.
501 To compile this driver as a module, choose M here: the
502 module will be called chsc_sch.
509 prompt "SCM bus driver"
511 Bus driver for Storage Class Memory.
515 prompt "Support for EADM subchannels"
518 This driver allows usage of EADM subchannels. EADM subchannels act
519 as a communication vehicle for SCM increments.
521 To compile this driver as a module, choose M here: the
522 module will be called eadm_sch.
529 bool "kernel crash dumps"
530 depends on 64BIT && SMP
533 Generate crash dump after being started by kexec.
534 Crash dump kernels are loaded in the main kernel with kexec-tools
535 into a specially reserved region and then later executed after
536 a crash by kdump/kexec.
537 For more details see Documentation/kdump/kdump.txt
541 prompt "zfcpdump support"
544 Select this option if you want to build an zfcpdump enabled kernel.
545 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
549 menu "Executable file formats / Emulations"
551 source "fs/Kconfig.binfmt"
555 prompt "Enable seccomp to safely compute untrusted bytecode"
558 This kernel feature is useful for number crunching applications
559 that may need to compute untrusted bytecode during their
560 execution. By using pipes or other transports made available to
561 the process as file descriptors supporting the read/write
562 syscalls, it's possible to isolate those applications in
563 their own address space using seccomp. Once seccomp is
564 enabled via /proc/<pid>/seccomp, it cannot be disabled
565 and the task is only allowed to execute a few safe syscalls
566 defined by each seccomp mode.
572 menu "Power Management"
574 config ARCH_HIBERNATION_POSSIBLE
577 source "kernel/power/Kconfig"
589 source "drivers/Kconfig"
593 source "arch/s390/Kconfig.debug"
595 source "security/Kconfig"
597 source "crypto/Kconfig"
601 menu "Virtualization"
605 prompt "Pseudo page fault support"
607 Select this option, if you want to use PFAULT pseudo page fault
608 handling under VM. If running native or in LPAR, this option
609 has no effect. If your VM does not support PFAULT, PAGEEX
610 pseudo page fault handling will be used.
611 Note that VM 4.2 supports PFAULT but has a bug in its
612 implementation that causes some problems.
613 Everybody who wants to run Linux under VM != VM4.2 should select
617 bool "VM shared kernel support"
618 depends on !JUMP_LABEL
620 Select this option, if you want to share the text segment of the
621 Linux kernel between different VM guests. This reduces memory
622 usage with lots of guests but greatly increases kernel size.
623 Also if a kernel was IPL'ed from a shared segment the kexec system
625 You should only select this option if you know what you are
626 doing and want to exploit this feature.
630 prompt "Cooperative memory management"
632 Select this option, if you want to enable the kernel interface
633 to reduce the memory size of the system. This is accomplished
634 by allocating pages of memory and put them "on hold". This only
635 makes sense for a system running under VM where the unused pages
636 will be reused by VM for other guest systems. The interface
637 allows an external monitor to balance memory of many systems.
638 Everybody who wants to run Linux under VM should select this
643 prompt "IUCV special message interface to cooperative memory management"
644 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
646 Select this option to enable the special message interface to
647 the cooperative memory management.
651 prompt "Linux - VM Monitor Stream, base infrastructure"
654 This provides a kernel interface for creating and updating z/VM APPLDATA
655 monitor records. The monitor records are updated at certain time
656 intervals, once the timer is started.
657 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
658 i.e. enables or disables monitoring on the Linux side.
659 A custom interval value (in seconds) can be written to
660 /proc/appldata/interval.
662 Defaults are 60 seconds interval and timer off.
663 The /proc entries can also be read from, showing the current settings.
667 prompt "Monitor memory management statistics"
668 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
670 This provides memory management related data to the Linux - VM Monitor
671 Stream, like paging/swapping rate, memory utilisation, etc.
672 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
673 APPLDATA monitor record, i.e. enables or disables monitoring this record
677 The /proc entry can also be read from, showing the current settings.
679 This can also be compiled as a module, which will be called
684 prompt "Monitor OS statistics"
685 depends on APPLDATA_BASE
687 This provides OS related data to the Linux - VM Monitor Stream, like
688 CPU utilisation, etc.
689 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
690 APPLDATA monitor record, i.e. enables or disables monitoring this record
694 This can also be compiled as a module, which will be called
697 config APPLDATA_NET_SUM
699 prompt "Monitor overall network statistics"
700 depends on APPLDATA_BASE && NET
702 This provides network related data to the Linux - VM Monitor Stream,
703 currently there is only a total sum of network I/O statistics, no
705 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
706 APPLDATA monitor record, i.e. enables or disables monitoring this record
710 This can also be compiled as a module, which will be called
715 prompt "s390 hypervisor file system support"
716 select SYS_HYPERVISOR
718 This is a virtual file system intended to provide accounting
719 information in an s390 hypervisor environment.
721 source "arch/s390/kvm/Kconfig"
725 prompt "s390 support for virtio devices"
727 select VIRTUALIZATION
729 select VIRTIO_CONSOLE
731 Enabling this option adds support for virtio based paravirtual device
734 Select this option if you want to run the kernel as a guest under