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
61 config ARCH_SUPPORTS_UPROBES
66 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
67 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAS_SG_CHAIN
70 select ARCH_HAVE_NMI_SAFE_CMPXCHG
71 select ARCH_INLINE_READ_LOCK
72 select ARCH_INLINE_READ_LOCK_BH
73 select ARCH_INLINE_READ_LOCK_IRQ
74 select ARCH_INLINE_READ_LOCK_IRQSAVE
75 select ARCH_INLINE_READ_TRYLOCK
76 select ARCH_INLINE_READ_UNLOCK
77 select ARCH_INLINE_READ_UNLOCK_BH
78 select ARCH_INLINE_READ_UNLOCK_IRQ
79 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
80 select ARCH_INLINE_SPIN_LOCK
81 select ARCH_INLINE_SPIN_LOCK_BH
82 select ARCH_INLINE_SPIN_LOCK_IRQ
83 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
84 select ARCH_INLINE_SPIN_TRYLOCK
85 select ARCH_INLINE_SPIN_TRYLOCK_BH
86 select ARCH_INLINE_SPIN_UNLOCK
87 select ARCH_INLINE_SPIN_UNLOCK_BH
88 select ARCH_INLINE_SPIN_UNLOCK_IRQ
89 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
90 select ARCH_INLINE_WRITE_LOCK
91 select ARCH_INLINE_WRITE_LOCK_BH
92 select ARCH_INLINE_WRITE_LOCK_IRQ
93 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
94 select ARCH_INLINE_WRITE_TRYLOCK
95 select ARCH_INLINE_WRITE_UNLOCK
96 select ARCH_INLINE_WRITE_UNLOCK_BH
97 select ARCH_INLINE_WRITE_UNLOCK_IRQ
98 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
99 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
100 select ARCH_SUPPORTS_ATOMIC_RMW
101 select ARCH_USE_CMPXCHG_LOCKREF
102 select ARCH_WANT_IPC_PARSE_VERSION
103 select BUILDTIME_EXTABLE_SORT
104 select CLONE_BACKWARDS2
105 select DYNAMIC_FTRACE if FUNCTION_TRACER
106 select GENERIC_CLOCKEVENTS
107 select GENERIC_CPU_DEVICES if !SMP
108 select GENERIC_FIND_FIRST_BIT
109 select GENERIC_SMP_IDLE_THREAD
110 select GENERIC_TIME_VSYSCALL
111 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
112 select HAVE_ARCH_AUDITSYSCALL
113 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
114 select HAVE_ARCH_SECCOMP_FILTER
115 select HAVE_ARCH_TRACEHOOK
116 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
117 select HAVE_BPF_JIT if 64BIT && PACK_STACK
118 select HAVE_CMPXCHG_DOUBLE
119 select HAVE_CMPXCHG_LOCAL
120 select HAVE_DEBUG_KMEMLEAK
121 select HAVE_DYNAMIC_FTRACE if 64BIT
122 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
125 select HAVE_FUNCTION_TRACER if 64BIT
126 select HAVE_FUTEX_CMPXCHG if FUTEX
127 select HAVE_KERNEL_BZIP2
128 select HAVE_KERNEL_GZIP
129 select HAVE_KERNEL_LZ4
130 select HAVE_KERNEL_LZMA
131 select HAVE_KERNEL_LZO
132 select HAVE_KERNEL_XZ
134 select HAVE_KRETPROBES
135 select HAVE_KVM if 64BIT
137 select HAVE_MEMBLOCK_NODE_MAP
138 select HAVE_MEMBLOCK_PHYS_MAP
139 select HAVE_MOD_ARCH_SPECIFIC
141 select HAVE_PERF_EVENTS
142 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_SYSCALL_TRACEPOINTS
144 select HAVE_UID16 if 32BIT
145 select HAVE_VIRT_CPU_ACCOUNTING
146 select MODULES_USE_ELF_RELA
149 select OLD_SIGSUSPEND3
150 select SYSCTL_EXCEPTION_TRACE
152 select VIRT_CPU_ACCOUNTING
155 config SCHED_OMIT_FRAME_POINTER
158 config PGTABLE_LEVELS
163 source "init/Kconfig"
165 source "kernel/Kconfig.freezer"
167 menu "Processor type and features"
169 config HAVE_MARCH_Z900_FEATURES
172 config HAVE_MARCH_Z990_FEATURES
174 select HAVE_MARCH_Z900_FEATURES
176 config HAVE_MARCH_Z9_109_FEATURES
178 select HAVE_MARCH_Z990_FEATURES
180 config HAVE_MARCH_Z10_FEATURES
182 select HAVE_MARCH_Z9_109_FEATURES
184 config HAVE_MARCH_Z196_FEATURES
186 select HAVE_MARCH_Z10_FEATURES
188 config HAVE_MARCH_ZEC12_FEATURES
190 select HAVE_MARCH_Z196_FEATURES
192 config HAVE_MARCH_Z13_FEATURES
194 select HAVE_MARCH_ZEC12_FEATURES
197 prompt "Processor type"
201 bool "System/390 model G5 and G6"
204 Select this to build a 31 bit kernel that works
205 on all ESA/390 and z/Architecture machines.
208 bool "IBM zSeries model z800 and z900"
209 select HAVE_MARCH_Z900_FEATURES if 64BIT
211 Select this to enable optimizations for model z800/z900 (2064 and
212 2066 series). This will enable some optimizations that are not
213 available on older ESA/390 (31 Bit) only CPUs.
216 bool "IBM zSeries model z890 and z990"
217 select HAVE_MARCH_Z990_FEATURES if 64BIT
219 Select this to enable optimizations for model z890/z990 (2084 and
220 2086 series). The kernel will be slightly faster but will not work
225 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
227 Select this to enable optimizations for IBM System z9 (2094 and
228 2096 series). The kernel will be slightly faster but will not work
232 bool "IBM System z10"
233 select HAVE_MARCH_Z10_FEATURES if 64BIT
235 Select this to enable optimizations for IBM System z10 (2097 and
236 2098 series). The kernel will be slightly faster but will not work
240 bool "IBM zEnterprise 114 and 196"
241 select HAVE_MARCH_Z196_FEATURES if 64BIT
243 Select this to enable optimizations for IBM zEnterprise 114 and 196
244 (2818 and 2817 series). The kernel will be slightly faster but will
245 not work on older machines.
248 bool "IBM zBC12 and zEC12"
249 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
251 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
252 2827 series). The kernel will be slightly faster but will not work on
257 select HAVE_MARCH_Z13_FEATURES if 64BIT
259 Select this to enable optimizations for IBM z13 (2964 series).
260 The kernel will be slightly faster but will not work on older
266 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
268 config MARCH_Z900_TUNE
269 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
271 config MARCH_Z990_TUNE
272 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
274 config MARCH_Z9_109_TUNE
275 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
277 config MARCH_Z10_TUNE
278 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
280 config MARCH_Z196_TUNE
281 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
283 config MARCH_ZEC12_TUNE
284 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
286 config MARCH_Z13_TUNE
287 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
290 prompt "Tune code generation"
293 Cause the compiler to tune (-mtune) the generated code for a machine.
294 This will make the code run faster on the selected machine but
295 somewhat slower on other machines.
296 This option only changes how the compiler emits instructions, not the
297 selection of instructions itself, so the resulting kernel will run on
303 Tune the generated code for the target processor for which the kernel
307 bool "System/390 model G5 and G6"
310 bool "IBM zSeries model z800 and z900"
313 bool "IBM zSeries model z890 and z990"
319 bool "IBM System z10"
322 bool "IBM zEnterprise 114 and 196"
325 bool "IBM zBC12 and zEC12"
334 prompt "64 bit kernel"
336 Select this option if you have an IBM z/Architecture machine
337 and want to use the 64 bit addressing mode.
344 prompt "Kernel support for 31 bit emulation"
346 select COMPAT_BINFMT_ELF if BINFMT_ELF
347 select ARCH_WANT_OLD_COMPAT_IPC
348 select COMPAT_OLD_SIGACTION
350 Select this option if you want to enable your system kernel to
351 handle system-calls from ELF binaries for 31 bit ESA. This option
352 (and some other stuff like libraries and such) is needed for
353 executing 31 bit applications. It is safe to say "Y".
355 config SYSVIPC_COMPAT
356 def_bool y if COMPAT && SYSVIPC
359 def_bool y if COMPAT && KEYS
363 prompt "Symmetric multi-processing support"
365 This enables support for systems with more than one CPU. If you have
366 a system with only one CPU, like most personal computers, say N. If
367 you have a system with more than one CPU, say Y.
369 If you say N here, the kernel will run on uni- and multiprocessor
370 machines, but will use only one CPU of a multiprocessor machine. If
371 you say Y here, the kernel will run on many, but not all,
372 uniprocessor machines. On a uniprocessor machine, the kernel
373 will run faster if you say N here.
375 See also the SMP-HOWTO available at
376 <http://www.tldp.org/docs.html#howto>.
378 Even if you don't know what to do here, say Y.
381 int "Maximum number of CPUs (2-512)"
384 default "32" if !64BIT
385 default "64" if 64BIT
387 This allows you to specify the maximum number of CPUs which this
388 kernel will support. The maximum supported value is 512 and the
389 minimum value which makes sense is 2.
391 This is purely to save memory - each supported CPU adds
392 approximately sixteen kilobytes to the kernel image.
396 prompt "Support for hot-pluggable CPUs"
399 Say Y here to be able to turn CPUs off and on. CPUs
400 can be controlled through /sys/devices/system/cpu/cpu#.
401 Say N if you want to disable CPU hotplug.
412 config SCHED_TOPOLOGY
414 prompt "Topology scheduler support"
420 Topology scheduler support improves the CPU scheduler's decision
421 making when dealing with machines that have multi-threading,
422 multiple cores or multiple books.
424 source kernel/Kconfig.preempt
428 prompt "IEEE FPU emulation"
431 This option is required for IEEE compliant floating point arithmetic
432 on older ESA/390 machines. Say Y unless you know your machine doesn't
435 source kernel/Kconfig.hz
441 config ARCH_SPARSEMEM_ENABLE
443 select SPARSEMEM_VMEMMAP_ENABLE
444 select SPARSEMEM_VMEMMAP
445 select SPARSEMEM_STATIC if !64BIT
447 config ARCH_SPARSEMEM_DEFAULT
450 config ARCH_SELECT_MEMORY_MODEL
453 config ARCH_ENABLE_MEMORY_HOTPLUG
454 def_bool y if SPARSEMEM
456 config ARCH_ENABLE_MEMORY_HOTREMOVE
459 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
463 config FORCE_MAX_ZONEORDER
471 prompt "Pack kernel stack"
473 This option enables the compiler option -mkernel-backchain if it
474 is available. If the option is available the compiler supports
475 the new stack layout which dramatically reduces the minimum stack
476 frame size. With an old compiler a non-leaf function needs a
477 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
478 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
479 and 24 byte on 64 bit.
481 Say Y if you are unsure.
485 prompt "Detect kernel stack overflow"
487 This option enables the compiler option -mstack-guard and
488 -mstack-size if they are available. If the compiler supports them
489 it will emit additional code to each function prolog to trigger
490 an illegal operation if the kernel stack is about to overflow.
492 Say N if you are unsure.
495 int "Size of the guard area (128-1024)"
497 depends on CHECK_STACK
500 This allows you to specify the size of the guard area at the lower
501 end of the kernel stack. If the kernel stack points into the guard
502 area on function entry an illegal operation is triggered. The size
503 needs to be a power of 2. Please keep in mind that the size of an
504 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
505 The minimum size for the stack guard should be 256 for 31 bit and
508 config WARN_DYNAMIC_STACK
510 prompt "Emit compiler warnings for function with dynamic stack usage"
512 This option enables the compiler option -mwarn-dynamicstack. If the
513 compiler supports this options generates warnings for functions
514 that dynamically allocate stack space using alloca.
516 Say N if you are unsure.
524 prompt "QDIO support"
526 This driver provides the Queued Direct I/O base support for
529 To compile this driver as a module, choose M here: the
530 module will be called qdio.
537 select HAVE_DMA_ATTRS
544 config PCI_NR_FUNCTIONS
545 int "Maximum number of PCI functions (1-4096)"
549 This allows you to specify the maximum number of PCI functions which
550 this kernel will support.
553 int "Maximum number of MSI interrupts (64-32768)"
557 This defines the number of virtual interrupts the kernel will
558 provide for MSI interrupts. If you configure your system to have
559 too few drivers will fail to allocate MSI interrupts for all
562 source "drivers/pci/Kconfig"
563 source "drivers/pci/pcie/Kconfig"
564 source "drivers/pci/hotplug/Kconfig"
579 select HAVE_DMA_API_DEBUG
581 config NEED_SG_DMA_LENGTH
584 config NEED_DMA_MAP_STATE
589 prompt "Support for CHSC subchannels"
591 This driver allows usage of CHSC subchannels. A CHSC subchannel
592 is usually present on LPAR only.
593 The driver creates a device /dev/chsc, which may be used to
594 obtain I/O configuration information about the machine and
595 to issue asynchronous chsc commands (DANGEROUS).
596 You will usually only want to use this interface on a special
597 LPAR designated for system management.
599 To compile this driver as a module, choose M here: the
600 module will be called chsc_sch.
607 prompt "SCM bus driver"
609 Bus driver for Storage Class Memory.
613 prompt "Support for EADM subchannels"
616 This driver allows usage of EADM subchannels. EADM subchannels act
617 as a communication vehicle for SCM increments.
619 To compile this driver as a module, choose M here: the
620 module will be called eadm_sch.
627 bool "kernel crash dumps"
628 depends on 64BIT && SMP
631 Generate crash dump after being started by kexec.
632 Crash dump kernels are loaded in the main kernel with kexec-tools
633 into a specially reserved region and then later executed after
634 a crash by kdump/kexec.
635 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
636 This option also enables s390 zfcpdump.
637 See also <file:Documentation/s390/zfcpdump.txt>
641 menu "Executable file formats / Emulations"
643 source "fs/Kconfig.binfmt"
647 prompt "Enable seccomp to safely compute untrusted bytecode"
650 This kernel feature is useful for number crunching applications
651 that may need to compute untrusted bytecode during their
652 execution. By using pipes or other transports made available to
653 the process as file descriptors supporting the read/write
654 syscalls, it's possible to isolate those applications in
655 their own address space using seccomp. Once seccomp is
656 enabled via /proc/<pid>/seccomp, it cannot be disabled
657 and the task is only allowed to execute a few safe syscalls
658 defined by each seccomp mode.
664 menu "Power Management"
666 config ARCH_HIBERNATION_POSSIBLE
669 source "kernel/power/Kconfig"
681 source "drivers/Kconfig"
685 source "arch/s390/Kconfig.debug"
687 source "security/Kconfig"
689 source "crypto/Kconfig"
693 menu "Virtualization"
697 prompt "Pseudo page fault support"
699 Select this option, if you want to use PFAULT pseudo page fault
700 handling under VM. If running native or in LPAR, this option
701 has no effect. If your VM does not support PFAULT, PAGEEX
702 pseudo page fault handling will be used.
703 Note that VM 4.2 supports PFAULT but has a bug in its
704 implementation that causes some problems.
705 Everybody who wants to run Linux under VM != VM4.2 should select
709 bool "VM shared kernel support"
710 depends on !JUMP_LABEL
712 Select this option, if you want to share the text segment of the
713 Linux kernel between different VM guests. This reduces memory
714 usage with lots of guests but greatly increases kernel size.
715 Also if a kernel was IPL'ed from a shared segment the kexec system
717 You should only select this option if you know what you are
718 doing and want to exploit this feature.
722 prompt "Cooperative memory management"
724 Select this option, if you want to enable the kernel interface
725 to reduce the memory size of the system. This is accomplished
726 by allocating pages of memory and put them "on hold". This only
727 makes sense for a system running under VM where the unused pages
728 will be reused by VM for other guest systems. The interface
729 allows an external monitor to balance memory of many systems.
730 Everybody who wants to run Linux under VM should select this
735 prompt "IUCV special message interface to cooperative memory management"
736 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
738 Select this option to enable the special message interface to
739 the cooperative memory management.
743 prompt "Linux - VM Monitor Stream, base infrastructure"
746 This provides a kernel interface for creating and updating z/VM APPLDATA
747 monitor records. The monitor records are updated at certain time
748 intervals, once the timer is started.
749 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
750 i.e. enables or disables monitoring on the Linux side.
751 A custom interval value (in seconds) can be written to
752 /proc/appldata/interval.
754 Defaults are 60 seconds interval and timer off.
755 The /proc entries can also be read from, showing the current settings.
759 prompt "Monitor memory management statistics"
760 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
762 This provides memory management related data to the Linux - VM Monitor
763 Stream, like paging/swapping rate, memory utilisation, etc.
764 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
765 APPLDATA monitor record, i.e. enables or disables monitoring this record
769 The /proc entry can also be read from, showing the current settings.
771 This can also be compiled as a module, which will be called
776 prompt "Monitor OS statistics"
777 depends on APPLDATA_BASE
779 This provides OS related data to the Linux - VM Monitor Stream, like
780 CPU utilisation, etc.
781 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
782 APPLDATA monitor record, i.e. enables or disables monitoring this record
786 This can also be compiled as a module, which will be called
789 config APPLDATA_NET_SUM
791 prompt "Monitor overall network statistics"
792 depends on APPLDATA_BASE && NET
794 This provides network related data to the Linux - VM Monitor Stream,
795 currently there is only a total sum of network I/O statistics, no
797 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
798 APPLDATA monitor record, i.e. enables or disables monitoring this record
802 This can also be compiled as a module, which will be called
807 prompt "s390 hypervisor file system support"
808 select SYS_HYPERVISOR
810 This is a virtual file system intended to provide accounting
811 information in an s390 hypervisor environment.
813 source "arch/s390/kvm/Kconfig"
817 prompt "s390 support for virtio devices"
820 select VIRTUALIZATION
822 select VIRTIO_CONSOLE
824 Enabling this option adds support for virtio based paravirtual device
827 Select this option if you want to run the kernel as a guest under