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_HAS_ATOMIC64_DEC_IF_POSITIVE
64 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
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_USE_CMPXCHG_LOCKREF
96 select ARCH_WANT_IPC_PARSE_VERSION
97 select BUILDTIME_EXTABLE_SORT
98 select CLONE_BACKWARDS2
99 select GENERIC_CLOCKEVENTS
100 select GENERIC_CPU_DEVICES if !SMP
101 select GENERIC_FIND_FIRST_BIT
102 select GENERIC_SMP_IDLE_THREAD
103 select GENERIC_TIME_VSYSCALL
104 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
105 select HAVE_ARCH_AUDITSYSCALL
106 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
107 select HAVE_ARCH_SECCOMP_FILTER
108 select HAVE_ARCH_TRACEHOOK
109 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
110 select HAVE_BPF_JIT if 64BIT && PACK_STACK
111 select HAVE_CMPXCHG_DOUBLE
112 select HAVE_CMPXCHG_LOCAL
113 select HAVE_C_RECORDMCOUNT
114 select HAVE_DEBUG_KMEMLEAK
115 select HAVE_DYNAMIC_FTRACE
116 select HAVE_FTRACE_MCOUNT_RECORD
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FUNCTION_TRACER
119 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
120 select HAVE_FUTEX_CMPXCHG if FUTEX
121 select HAVE_KERNEL_BZIP2
122 select HAVE_KERNEL_GZIP
123 select HAVE_KERNEL_LZ4
124 select HAVE_KERNEL_LZMA
125 select HAVE_KERNEL_LZO
126 select HAVE_KERNEL_XZ
128 select HAVE_KRETPROBES
129 select HAVE_KVM if 64BIT
131 select HAVE_MEMBLOCK_NODE_MAP
132 select HAVE_MEMBLOCK_PHYS_MAP
133 select HAVE_MOD_ARCH_SPECIFIC
135 select HAVE_PERF_EVENTS
136 select HAVE_REGS_AND_STACK_ACCESS_API
137 select HAVE_SYSCALL_TRACEPOINTS
138 select HAVE_UID16 if 32BIT
139 select HAVE_VIRT_CPU_ACCOUNTING
140 select KTIME_SCALAR if 32BIT
141 select MODULES_USE_ELF_RELA
144 select OLD_SIGSUSPEND3
145 select SYSCTL_EXCEPTION_TRACE
147 select VIRT_CPU_ACCOUNTING
150 config SCHED_OMIT_FRAME_POINTER
153 source "init/Kconfig"
155 source "kernel/Kconfig.freezer"
157 menu "Processor type and features"
159 config HAVE_MARCH_Z900_FEATURES
162 config HAVE_MARCH_Z990_FEATURES
164 select HAVE_MARCH_Z900_FEATURES
166 config HAVE_MARCH_Z9_109_FEATURES
168 select HAVE_MARCH_Z990_FEATURES
170 config HAVE_MARCH_Z10_FEATURES
172 select HAVE_MARCH_Z9_109_FEATURES
174 config HAVE_MARCH_Z196_FEATURES
176 select HAVE_MARCH_Z10_FEATURES
178 config HAVE_MARCH_ZEC12_FEATURES
180 select HAVE_MARCH_Z196_FEATURES
183 prompt "Processor type"
187 bool "System/390 model G5 and G6"
190 Select this to build a 31 bit kernel that works
191 on all ESA/390 and z/Architecture machines.
194 bool "IBM zSeries model z800 and z900"
195 select HAVE_MARCH_Z900_FEATURES if 64BIT
197 Select this to enable optimizations for model z800/z900 (2064 and
198 2066 series). This will enable some optimizations that are not
199 available on older ESA/390 (31 Bit) only CPUs.
202 bool "IBM zSeries model z890 and z990"
203 select HAVE_MARCH_Z990_FEATURES if 64BIT
205 Select this to enable optimizations for model z890/z990 (2084 and
206 2086 series). The kernel will be slightly faster but will not work
211 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
213 Select this to enable optimizations for IBM System z9 (2094 and
214 2096 series). The kernel will be slightly faster but will not work
218 bool "IBM System z10"
219 select HAVE_MARCH_Z10_FEATURES if 64BIT
221 Select this to enable optimizations for IBM System z10 (2097 and
222 2098 series). The kernel will be slightly faster but will not work
226 bool "IBM zEnterprise 114 and 196"
227 select HAVE_MARCH_Z196_FEATURES if 64BIT
229 Select this to enable optimizations for IBM zEnterprise 114 and 196
230 (2818 and 2817 series). The kernel will be slightly faster but will
231 not work on older machines.
234 bool "IBM zBC12 and zEC12"
235 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
237 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
238 2827 series). The kernel will be slightly faster but will not work on
244 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
246 config MARCH_Z900_TUNE
247 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
249 config MARCH_Z990_TUNE
250 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
252 config MARCH_Z9_109_TUNE
253 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
255 config MARCH_Z10_TUNE
256 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
258 config MARCH_Z196_TUNE
259 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
261 config MARCH_ZEC12_TUNE
262 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
265 prompt "Tune code generation"
268 Cause the compiler to tune (-mtune) the generated code for a machine.
269 This will make the code run faster on the selected machine but
270 somewhat slower on other machines.
271 This option only changes how the compiler emits instructions, not the
272 selection of instructions itself, so the resulting kernel will run on
278 Tune the generated code for the target processor for which the kernel
282 bool "System/390 model G5 and G6"
285 bool "IBM zSeries model z800 and z900"
288 bool "IBM zSeries model z890 and z990"
294 bool "IBM System z10"
297 bool "IBM zEnterprise 114 and 196"
300 bool "IBM zBC12 and zEC12"
306 prompt "64 bit kernel"
308 Select this option if you have an IBM z/Architecture machine
309 and want to use the 64 bit addressing mode.
316 prompt "Kernel support for 31 bit emulation"
318 select COMPAT_BINFMT_ELF if BINFMT_ELF
319 select ARCH_WANT_OLD_COMPAT_IPC
320 select COMPAT_OLD_SIGACTION
322 Select this option if you want to enable your system kernel to
323 handle system-calls from ELF binaries for 31 bit ESA. This option
324 (and some other stuff like libraries and such) is needed for
325 executing 31 bit applications. It is safe to say "Y".
327 config SYSVIPC_COMPAT
328 def_bool y if COMPAT && SYSVIPC
331 def_bool y if COMPAT && KEYS
335 prompt "Symmetric multi-processing support"
337 This enables support for systems with more than one CPU. If you have
338 a system with only one CPU, like most personal computers, say N. If
339 you have a system with more than one CPU, say Y.
341 If you say N here, the kernel will run on uni- and multiprocessor
342 machines, but will use only one CPU of a multiprocessor machine. If
343 you say Y here, the kernel will run on many, but not all,
344 uniprocessor machines. On a uniprocessor machine, the kernel
345 will run faster if you say N here.
347 See also the SMP-HOWTO available at
348 <http://www.tldp.org/docs.html#howto>.
350 Even if you don't know what to do here, say Y.
353 int "Maximum number of CPUs (2-256)"
356 default "32" if !64BIT
357 default "64" if 64BIT
359 This allows you to specify the maximum number of CPUs which this
360 kernel will support. The maximum supported value is 256 and the
361 minimum value which makes sense is 2.
363 This is purely to save memory - each supported CPU adds
364 approximately sixteen kilobytes to the kernel image.
368 prompt "Support for hot-pluggable CPUs"
371 Say Y here to be able to turn CPUs off and on. CPUs
372 can be controlled through /sys/devices/system/cpu/cpu#.
373 Say N if you want to disable CPU hotplug.
380 prompt "Book scheduler support"
384 Book scheduler support improves the CPU scheduler's decision making
385 when dealing with machines that have several books.
387 source kernel/Kconfig.preempt
391 prompt "IEEE FPU emulation"
394 This option is required for IEEE compliant floating point arithmetic
395 on older ESA/390 machines. Say Y unless you know your machine doesn't
398 source kernel/Kconfig.hz
404 config ARCH_SPARSEMEM_ENABLE
406 select SPARSEMEM_VMEMMAP_ENABLE
407 select SPARSEMEM_VMEMMAP
408 select SPARSEMEM_STATIC if !64BIT
410 config ARCH_SPARSEMEM_DEFAULT
413 config ARCH_SELECT_MEMORY_MODEL
416 config ARCH_ENABLE_MEMORY_HOTPLUG
417 def_bool y if SPARSEMEM
419 config ARCH_ENABLE_MEMORY_HOTREMOVE
422 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
426 config FORCE_MAX_ZONEORDER
434 prompt "Pack kernel stack"
436 This option enables the compiler option -mkernel-backchain if it
437 is available. If the option is available the compiler supports
438 the new stack layout which dramatically reduces the minimum stack
439 frame size. With an old compiler a non-leaf function needs a
440 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
441 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
442 and 24 byte on 64 bit.
444 Say Y if you are unsure.
448 prompt "Detect kernel stack overflow"
450 This option enables the compiler option -mstack-guard and
451 -mstack-size if they are available. If the compiler supports them
452 it will emit additional code to each function prolog to trigger
453 an illegal operation if the kernel stack is about to overflow.
455 Say N if you are unsure.
458 int "Size of the guard area (128-1024)"
460 depends on CHECK_STACK
463 This allows you to specify the size of the guard area at the lower
464 end of the kernel stack. If the kernel stack points into the guard
465 area on function entry an illegal operation is triggered. The size
466 needs to be a power of 2. Please keep in mind that the size of an
467 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
468 The minimum size for the stack guard should be 256 for 31 bit and
471 config WARN_DYNAMIC_STACK
473 prompt "Emit compiler warnings for function with dynamic stack usage"
475 This option enables the compiler option -mwarn-dynamicstack. If the
476 compiler supports this options generates warnings for functions
477 that dynamically allocate stack space using alloca.
479 Say N if you are unsure.
487 prompt "QDIO support"
489 This driver provides the Queued Direct I/O base support for
492 To compile this driver as a module, choose M here: the
493 module will be called qdio.
507 config PCI_NR_FUNCTIONS
508 int "Maximum number of PCI functions (1-4096)"
512 This allows you to specify the maximum number of PCI functions which
513 this kernel will support.
516 int "Maximum number of MSI interrupts (64-32768)"
520 This defines the number of virtual interrupts the kernel will
521 provide for MSI interrupts. If you configure your system to have
522 too few drivers will fail to allocate MSI interrupts for all
525 source "drivers/pci/Kconfig"
526 source "drivers/pci/pcie/Kconfig"
527 source "drivers/pci/hotplug/Kconfig"
542 select HAVE_DMA_API_DEBUG
544 config NEED_SG_DMA_LENGTH
547 config HAVE_DMA_ATTRS
550 config NEED_DMA_MAP_STATE
555 prompt "Support for CHSC subchannels"
557 This driver allows usage of CHSC subchannels. A CHSC subchannel
558 is usually present on LPAR only.
559 The driver creates a device /dev/chsc, which may be used to
560 obtain I/O configuration information about the machine and
561 to issue asynchronous chsc commands (DANGEROUS).
562 You will usually only want to use this interface on a special
563 LPAR designated for system management.
565 To compile this driver as a module, choose M here: the
566 module will be called chsc_sch.
573 prompt "SCM bus driver"
575 Bus driver for Storage Class Memory.
579 prompt "Support for EADM subchannels"
582 This driver allows usage of EADM subchannels. EADM subchannels act
583 as a communication vehicle for SCM increments.
585 To compile this driver as a module, choose M here: the
586 module will be called eadm_sch.
593 bool "kernel crash dumps"
594 depends on 64BIT && SMP
597 Generate crash dump after being started by kexec.
598 Crash dump kernels are loaded in the main kernel with kexec-tools
599 into a specially reserved region and then later executed after
600 a crash by kdump/kexec.
601 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
602 This option also enables s390 zfcpdump.
603 See also <file:Documentation/s390/zfcpdump.txt>
607 menu "Executable file formats / Emulations"
609 source "fs/Kconfig.binfmt"
613 prompt "Enable seccomp to safely compute untrusted bytecode"
616 This kernel feature is useful for number crunching applications
617 that may need to compute untrusted bytecode during their
618 execution. By using pipes or other transports made available to
619 the process as file descriptors supporting the read/write
620 syscalls, it's possible to isolate those applications in
621 their own address space using seccomp. Once seccomp is
622 enabled via /proc/<pid>/seccomp, it cannot be disabled
623 and the task is only allowed to execute a few safe syscalls
624 defined by each seccomp mode.
630 menu "Power Management"
632 config ARCH_HIBERNATION_POSSIBLE
635 source "kernel/power/Kconfig"
647 source "drivers/Kconfig"
651 source "arch/s390/Kconfig.debug"
653 source "security/Kconfig"
655 source "crypto/Kconfig"
659 menu "Virtualization"
663 prompt "Pseudo page fault support"
665 Select this option, if you want to use PFAULT pseudo page fault
666 handling under VM. If running native or in LPAR, this option
667 has no effect. If your VM does not support PFAULT, PAGEEX
668 pseudo page fault handling will be used.
669 Note that VM 4.2 supports PFAULT but has a bug in its
670 implementation that causes some problems.
671 Everybody who wants to run Linux under VM != VM4.2 should select
675 bool "VM shared kernel support"
676 depends on !JUMP_LABEL
678 Select this option, if you want to share the text segment of the
679 Linux kernel between different VM guests. This reduces memory
680 usage with lots of guests but greatly increases kernel size.
681 Also if a kernel was IPL'ed from a shared segment the kexec system
683 You should only select this option if you know what you are
684 doing and want to exploit this feature.
688 prompt "Cooperative memory management"
690 Select this option, if you want to enable the kernel interface
691 to reduce the memory size of the system. This is accomplished
692 by allocating pages of memory and put them "on hold". This only
693 makes sense for a system running under VM where the unused pages
694 will be reused by VM for other guest systems. The interface
695 allows an external monitor to balance memory of many systems.
696 Everybody who wants to run Linux under VM should select this
701 prompt "IUCV special message interface to cooperative memory management"
702 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
704 Select this option to enable the special message interface to
705 the cooperative memory management.
709 prompt "Linux - VM Monitor Stream, base infrastructure"
712 This provides a kernel interface for creating and updating z/VM APPLDATA
713 monitor records. The monitor records are updated at certain time
714 intervals, once the timer is started.
715 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
716 i.e. enables or disables monitoring on the Linux side.
717 A custom interval value (in seconds) can be written to
718 /proc/appldata/interval.
720 Defaults are 60 seconds interval and timer off.
721 The /proc entries can also be read from, showing the current settings.
725 prompt "Monitor memory management statistics"
726 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
728 This provides memory management related data to the Linux - VM Monitor
729 Stream, like paging/swapping rate, memory utilisation, etc.
730 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
731 APPLDATA monitor record, i.e. enables or disables monitoring this record
735 The /proc entry can also be read from, showing the current settings.
737 This can also be compiled as a module, which will be called
742 prompt "Monitor OS statistics"
743 depends on APPLDATA_BASE
745 This provides OS related data to the Linux - VM Monitor Stream, like
746 CPU utilisation, etc.
747 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
748 APPLDATA monitor record, i.e. enables or disables monitoring this record
752 This can also be compiled as a module, which will be called
755 config APPLDATA_NET_SUM
757 prompt "Monitor overall network statistics"
758 depends on APPLDATA_BASE && NET
760 This provides network related data to the Linux - VM Monitor Stream,
761 currently there is only a total sum of network I/O statistics, no
763 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
764 APPLDATA monitor record, i.e. enables or disables monitoring this record
768 This can also be compiled as a module, which will be called
773 prompt "s390 hypervisor file system support"
774 select SYS_HYPERVISOR
776 This is a virtual file system intended to provide accounting
777 information in an s390 hypervisor environment.
779 source "arch/s390/kvm/Kconfig"
783 prompt "s390 support for virtio devices"
786 select VIRTUALIZATION
788 select VIRTIO_CONSOLE
790 Enabling this option adds support for virtio based paravirtual device
793 Select this option if you want to run the kernel as a guest under