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
137 select INIT_ALL_POSSIBLE
138 select KTIME_SCALAR if 32BIT
139 select MODULES_USE_ELF_RELA
140 select OLD_SIGSUSPEND3
142 select SYSCTL_EXCEPTION_TRACE
143 select USE_GENERIC_SMP_HELPERS if SMP
144 select VIRT_CPU_ACCOUNTING
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
174 config HAVE_MARCH_ZEC12_FEATURES
176 select HAVE_MARCH_Z196_FEATURES
179 prompt "Processor type"
183 bool "System/390 model G5 and G6"
186 Select this to build a 31 bit kernel that works
187 on all ESA/390 and z/Architecture machines.
190 bool "IBM zSeries model z800 and z900"
191 select HAVE_MARCH_Z900_FEATURES if 64BIT
193 Select this to enable optimizations for model z800/z900 (2064 and
194 2066 series). This will enable some optimizations that are not
195 available on older ESA/390 (31 Bit) only CPUs.
198 bool "IBM zSeries model z890 and z990"
199 select HAVE_MARCH_Z990_FEATURES if 64BIT
201 Select this to enable optimizations for model z890/z990 (2084 and
202 2086 series). The kernel will be slightly faster but will not work
207 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
209 Select this to enable optimizations for IBM System z9 (2094 and
210 2096 series). The kernel will be slightly faster but will not work
214 bool "IBM System z10"
215 select HAVE_MARCH_Z10_FEATURES if 64BIT
217 Select this to enable optimizations for IBM System z10 (2097 and
218 2098 series). The kernel will be slightly faster but will not work
222 bool "IBM zEnterprise 114 and 196"
223 select HAVE_MARCH_Z196_FEATURES if 64BIT
225 Select this to enable optimizations for IBM zEnterprise 114 and 196
226 (2818 and 2817 series). The kernel will be slightly faster but will
227 not work on older machines.
231 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
233 Select this to enable optimizations for IBM zEC12 (2827 series). The
234 kernel will be slightly faster but will not work on older machines.
240 prompt "64 bit kernel"
242 Select this option if you have an IBM z/Architecture machine
243 and want to use the 64 bit addressing mode.
250 prompt "Kernel support for 31 bit emulation"
252 select COMPAT_BINFMT_ELF if BINFMT_ELF
253 select ARCH_WANT_OLD_COMPAT_IPC
254 select COMPAT_OLD_SIGACTION
256 Select this option if you want to enable your system kernel to
257 handle system-calls from ELF binaries for 31 bit ESA. This option
258 (and some other stuff like libraries and such) is needed for
259 executing 31 bit applications. It is safe to say "Y".
261 config SYSVIPC_COMPAT
262 def_bool y if COMPAT && SYSVIPC
265 def_bool y if COMPAT && KEYS
269 prompt "Symmetric multi-processing support"
271 This enables support for systems with more than one CPU. If you have
272 a system with only one CPU, like most personal computers, say N. If
273 you have a system with more than one CPU, say Y.
275 If you say N here, the kernel will run on single and multiprocessor
276 machines, but will use only one CPU of a multiprocessor machine. If
277 you say Y here, the kernel will run on many, but not all,
278 singleprocessor machines. On a singleprocessor machine, the kernel
279 will run faster if you say N here.
281 See also the SMP-HOWTO available at
282 <http://www.tldp.org/docs.html#howto>.
284 Even if you don't know what to do here, say Y.
287 int "Maximum number of CPUs (2-64)"
290 default "32" if !64BIT
291 default "64" if 64BIT
293 This allows you to specify the maximum number of CPUs which this
294 kernel will support. The maximum supported value is 64 and the
295 minimum value which makes sense is 2.
297 This is purely to save memory - each supported CPU adds
298 approximately sixteen kilobytes to the kernel image.
302 prompt "Support for hot-pluggable CPUs"
306 Say Y here to be able to turn CPUs off and on. CPUs
307 can be controlled through /sys/devices/system/cpu/cpu#.
308 Say N if you want to disable CPU hotplug.
315 prompt "Book scheduler support"
319 Book scheduler support improves the CPU scheduler's decision making
320 when dealing with machines that have several books.
322 source kernel/Kconfig.preempt
326 prompt "IEEE FPU emulation"
329 This option is required for IEEE compliant floating point arithmetic
330 on older ESA/390 machines. Say Y unless you know your machine doesn't
333 source kernel/Kconfig.hz
339 config ARCH_SPARSEMEM_ENABLE
341 select SPARSEMEM_VMEMMAP_ENABLE
342 select SPARSEMEM_VMEMMAP
343 select SPARSEMEM_STATIC if !64BIT
345 config ARCH_SPARSEMEM_DEFAULT
348 config ARCH_SELECT_MEMORY_MODEL
351 config ARCH_ENABLE_MEMORY_HOTPLUG
352 def_bool y if SPARSEMEM
354 config ARCH_ENABLE_MEMORY_HOTREMOVE
357 config FORCE_MAX_ZONEORDER
365 prompt "Pack kernel stack"
367 This option enables the compiler option -mkernel-backchain if it
368 is available. If the option is available the compiler supports
369 the new stack layout which dramatically reduces the minimum stack
370 frame size. With an old compiler a non-leaf function needs a
371 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
372 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
373 and 24 byte on 64 bit.
375 Say Y if you are unsure.
379 prompt "Use 8kb for kernel stack instead of 16kb"
380 depends on PACK_STACK && 64BIT && !LOCKDEP
382 If you say Y here and the compiler supports the -mkernel-backchain
383 option the kernel will use a smaller kernel stack size. The reduced
384 size is 8kb instead of 16kb. This allows to run more threads on a
385 system and reduces the pressure on the memory management for higher
386 order page allocations.
388 Say N if you are unsure.
392 prompt "Detect kernel stack overflow"
394 This option enables the compiler option -mstack-guard and
395 -mstack-size if they are available. If the compiler supports them
396 it will emit additional code to each function prolog to trigger
397 an illegal operation if the kernel stack is about to overflow.
399 Say N if you are unsure.
402 int "Size of the guard area (128-1024)"
404 depends on CHECK_STACK
407 This allows you to specify the size of the guard area at the lower
408 end of the kernel stack. If the kernel stack points into the guard
409 area on function entry an illegal operation is triggered. The size
410 needs to be a power of 2. Please keep in mind that the size of an
411 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
412 The minimum size for the stack guard should be 256 for 31 bit and
415 config WARN_DYNAMIC_STACK
417 prompt "Emit compiler warnings for function with dynamic stack usage"
419 This option enables the compiler option -mwarn-dynamicstack. If the
420 compiler supports this options generates warnings for functions
421 that dynamically allocate stack space using alloca.
423 Say N if you are unsure.
431 prompt "QDIO support"
433 This driver provides the Queued Direct I/O base support for
436 To compile this driver as a module, choose M here: the
437 module will be called qdio.
445 select ARCH_SUPPORTS_MSI
452 config PCI_NR_FUNCTIONS
453 int "Maximum number of PCI functions (1-4096)"
457 This allows you to specify the maximum number of PCI functions which
458 this kernel will support.
460 source "drivers/pci/Kconfig"
461 source "drivers/pci/pcie/Kconfig"
462 source "drivers/pci/hotplug/Kconfig"
477 select HAVE_DMA_API_DEBUG
479 config NEED_SG_DMA_LENGTH
482 config HAVE_DMA_ATTRS
485 config NEED_DMA_MAP_STATE
490 prompt "Support for CHSC subchannels"
492 This driver allows usage of CHSC subchannels. A CHSC subchannel
493 is usually present on LPAR only.
494 The driver creates a device /dev/chsc, which may be used to
495 obtain I/O configuration information about the machine and
496 to issue asynchronous chsc commands (DANGEROUS).
497 You will usually only want to use this interface on a special
498 LPAR designated for system management.
500 To compile this driver as a module, choose M here: the
501 module will be called chsc_sch.
508 prompt "SCM bus driver"
510 Bus driver for Storage Class Memory.
514 prompt "Support for EADM subchannels"
517 This driver allows usage of EADM subchannels. EADM subchannels act
518 as a communication vehicle for SCM increments.
520 To compile this driver as a module, choose M here: the
521 module will be called eadm_sch.
528 bool "kernel crash dumps"
529 depends on 64BIT && SMP
532 Generate crash dump after being started by kexec.
533 Crash dump kernels are loaded in the main kernel with kexec-tools
534 into a specially reserved region and then later executed after
535 a crash by kdump/kexec.
536 For more details see Documentation/kdump/kdump.txt
540 prompt "zfcpdump support"
543 Select this option if you want to build an zfcpdump enabled kernel.
544 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
548 menu "Executable file formats / Emulations"
550 source "fs/Kconfig.binfmt"
554 prompt "Enable seccomp to safely compute untrusted bytecode"
557 This kernel feature is useful for number crunching applications
558 that may need to compute untrusted bytecode during their
559 execution. By using pipes or other transports made available to
560 the process as file descriptors supporting the read/write
561 syscalls, it's possible to isolate those applications in
562 their own address space using seccomp. Once seccomp is
563 enabled via /proc/<pid>/seccomp, it cannot be disabled
564 and the task is only allowed to execute a few safe syscalls
565 defined by each seccomp mode.
571 menu "Power Management"
573 config ARCH_HIBERNATION_POSSIBLE
576 source "kernel/power/Kconfig"
588 source "drivers/Kconfig"
592 source "arch/s390/Kconfig.debug"
594 source "security/Kconfig"
596 source "crypto/Kconfig"
600 menu "Virtualization"
604 prompt "Pseudo page fault support"
606 Select this option, if you want to use PFAULT pseudo page fault
607 handling under VM. If running native or in LPAR, this option
608 has no effect. If your VM does not support PFAULT, PAGEEX
609 pseudo page fault handling will be used.
610 Note that VM 4.2 supports PFAULT but has a bug in its
611 implementation that causes some problems.
612 Everybody who wants to run Linux under VM != VM4.2 should select
616 bool "VM shared kernel support"
617 depends on !JUMP_LABEL
619 Select this option, if you want to share the text segment of the
620 Linux kernel between different VM guests. This reduces memory
621 usage with lots of guests but greatly increases kernel size.
622 Also if a kernel was IPL'ed from a shared segment the kexec system
624 You should only select this option if you know what you are
625 doing and want to exploit this feature.
629 prompt "Cooperative memory management"
631 Select this option, if you want to enable the kernel interface
632 to reduce the memory size of the system. This is accomplished
633 by allocating pages of memory and put them "on hold". This only
634 makes sense for a system running under VM where the unused pages
635 will be reused by VM for other guest systems. The interface
636 allows an external monitor to balance memory of many systems.
637 Everybody who wants to run Linux under VM should select this
642 prompt "IUCV special message interface to cooperative memory management"
643 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
645 Select this option to enable the special message interface to
646 the cooperative memory management.
650 prompt "Linux - VM Monitor Stream, base infrastructure"
653 This provides a kernel interface for creating and updating z/VM APPLDATA
654 monitor records. The monitor records are updated at certain time
655 intervals, once the timer is started.
656 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
657 i.e. enables or disables monitoring on the Linux side.
658 A custom interval value (in seconds) can be written to
659 /proc/appldata/interval.
661 Defaults are 60 seconds interval and timer off.
662 The /proc entries can also be read from, showing the current settings.
666 prompt "Monitor memory management statistics"
667 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
669 This provides memory management related data to the Linux - VM Monitor
670 Stream, like paging/swapping rate, memory utilisation, etc.
671 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
672 APPLDATA monitor record, i.e. enables or disables monitoring this record
676 The /proc entry can also be read from, showing the current settings.
678 This can also be compiled as a module, which will be called
683 prompt "Monitor OS statistics"
684 depends on APPLDATA_BASE
686 This provides OS related data to the Linux - VM Monitor Stream, like
687 CPU utilisation, etc.
688 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
689 APPLDATA monitor record, i.e. enables or disables monitoring this record
693 This can also be compiled as a module, which will be called
696 config APPLDATA_NET_SUM
698 prompt "Monitor overall network statistics"
699 depends on APPLDATA_BASE && NET
701 This provides network related data to the Linux - VM Monitor Stream,
702 currently there is only a total sum of network I/O statistics, no
704 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
705 APPLDATA monitor record, i.e. enables or disables monitoring this record
709 This can also be compiled as a module, which will be called
714 prompt "s390 hypervisor file system support"
715 select SYS_HYPERVISOR
717 This is a virtual file system intended to provide accounting
718 information in an s390 hypervisor environment.
720 source "arch/s390/kvm/Kconfig"
724 prompt "s390 support for virtio devices"
726 select VIRTUALIZATION
728 select VIRTIO_CONSOLE
730 Enabling this option adds support for virtio based paravirtual device
733 Select this option if you want to run the kernel as a guest under