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_HAS_DEBUG_STRICT_USER_COPY_CHECKS
66 select ARCH_HAVE_NMI_SAFE_CMPXCHG
67 select ARCH_INLINE_READ_LOCK
68 select ARCH_INLINE_READ_LOCK_BH
69 select ARCH_INLINE_READ_LOCK_IRQ
70 select ARCH_INLINE_READ_LOCK_IRQSAVE
71 select ARCH_INLINE_READ_TRYLOCK
72 select ARCH_INLINE_READ_UNLOCK
73 select ARCH_INLINE_READ_UNLOCK_BH
74 select ARCH_INLINE_READ_UNLOCK_IRQ
75 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
76 select ARCH_INLINE_SPIN_LOCK
77 select ARCH_INLINE_SPIN_LOCK_BH
78 select ARCH_INLINE_SPIN_LOCK_IRQ
79 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
80 select ARCH_INLINE_SPIN_TRYLOCK
81 select ARCH_INLINE_SPIN_TRYLOCK_BH
82 select ARCH_INLINE_SPIN_UNLOCK
83 select ARCH_INLINE_SPIN_UNLOCK_BH
84 select ARCH_INLINE_SPIN_UNLOCK_IRQ
85 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_WRITE_LOCK
87 select ARCH_INLINE_WRITE_LOCK_BH
88 select ARCH_INLINE_WRITE_LOCK_IRQ
89 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
90 select ARCH_INLINE_WRITE_TRYLOCK
91 select ARCH_INLINE_WRITE_UNLOCK
92 select ARCH_INLINE_WRITE_UNLOCK_BH
93 select ARCH_INLINE_WRITE_UNLOCK_IRQ
94 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
95 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
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_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_SECCOMP_FILTER
106 select HAVE_ARCH_TRACEHOOK
107 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
108 select HAVE_BPF_JIT if 64BIT && PACK_STACK
109 select HAVE_CMPXCHG_DOUBLE
110 select HAVE_CMPXCHG_LOCAL
111 select HAVE_C_RECORDMCOUNT
112 select HAVE_DEBUG_KMEMLEAK
113 select HAVE_DYNAMIC_FTRACE
114 select HAVE_FTRACE_MCOUNT_RECORD
115 select HAVE_FUNCTION_GRAPH_TRACER
116 select HAVE_FUNCTION_TRACER
117 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
118 select HAVE_KERNEL_BZIP2
119 select HAVE_KERNEL_GZIP
120 select HAVE_KERNEL_LZ4
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_UID16 if 32BIT
135 select HAVE_VIRT_CPU_ACCOUNTING
136 select INIT_ALL_POSSIBLE
137 select KTIME_SCALAR if 32BIT
138 select MODULES_USE_ELF_RELA
140 select OLD_SIGSUSPEND3
141 select SYSCTL_EXCEPTION_TRACE
142 select USE_GENERIC_SMP_HELPERS if SMP
143 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.
230 bool "IBM zBC12 and zEC12"
231 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
233 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
234 2827 series). The kernel will be slightly faster but will not work on
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"
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 "Detect kernel stack overflow"
381 This option enables the compiler option -mstack-guard and
382 -mstack-size if they are available. If the compiler supports them
383 it will emit additional code to each function prolog to trigger
384 an illegal operation if the kernel stack is about to overflow.
386 Say N if you are unsure.
389 int "Size of the guard area (128-1024)"
391 depends on CHECK_STACK
394 This allows you to specify the size of the guard area at the lower
395 end of the kernel stack. If the kernel stack points into the guard
396 area on function entry an illegal operation is triggered. The size
397 needs to be a power of 2. Please keep in mind that the size of an
398 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
399 The minimum size for the stack guard should be 256 for 31 bit and
402 config WARN_DYNAMIC_STACK
404 prompt "Emit compiler warnings for function with dynamic stack usage"
406 This option enables the compiler option -mwarn-dynamicstack. If the
407 compiler supports this options generates warnings for functions
408 that dynamically allocate stack space using alloca.
410 Say N if you are unsure.
418 prompt "QDIO support"
420 This driver provides the Queued Direct I/O base support for
423 To compile this driver as a module, choose M here: the
424 module will be called qdio.
438 config PCI_NR_FUNCTIONS
439 int "Maximum number of PCI functions (1-4096)"
443 This allows you to specify the maximum number of PCI functions which
444 this kernel will support.
447 int "Maximum number of MSI interrupts (64-32768)"
451 This defines the number of virtual interrupts the kernel will
452 provide for MSI interrupts. If you configure your system to have
453 too few drivers will fail to allocate MSI interrupts for all
456 source "drivers/pci/Kconfig"
457 source "drivers/pci/pcie/Kconfig"
458 source "drivers/pci/hotplug/Kconfig"
473 select HAVE_DMA_API_DEBUG
475 config NEED_SG_DMA_LENGTH
478 config HAVE_DMA_ATTRS
481 config NEED_DMA_MAP_STATE
486 prompt "Support for CHSC subchannels"
488 This driver allows usage of CHSC subchannels. A CHSC subchannel
489 is usually present on LPAR only.
490 The driver creates a device /dev/chsc, which may be used to
491 obtain I/O configuration information about the machine and
492 to issue asynchronous chsc commands (DANGEROUS).
493 You will usually only want to use this interface on a special
494 LPAR designated for system management.
496 To compile this driver as a module, choose M here: the
497 module will be called chsc_sch.
504 prompt "SCM bus driver"
506 Bus driver for Storage Class Memory.
510 prompt "Support for EADM subchannels"
513 This driver allows usage of EADM subchannels. EADM subchannels act
514 as a communication vehicle for SCM increments.
516 To compile this driver as a module, choose M here: the
517 module will be called eadm_sch.
524 bool "kernel crash dumps"
525 depends on 64BIT && SMP
529 Generate crash dump after being started by kexec.
530 Crash dump kernels are loaded in the main kernel with kexec-tools
531 into a specially reserved region and then later executed after
532 a crash by kdump/kexec.
533 For more details see Documentation/kdump/kdump.txt
537 prompt "zfcpdump support"
540 Select this option if you want to build an zfcpdump enabled kernel.
541 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
545 menu "Executable file formats / Emulations"
547 source "fs/Kconfig.binfmt"
551 prompt "Enable seccomp to safely compute untrusted bytecode"
554 This kernel feature is useful for number crunching applications
555 that may need to compute untrusted bytecode during their
556 execution. By using pipes or other transports made available to
557 the process as file descriptors supporting the read/write
558 syscalls, it's possible to isolate those applications in
559 their own address space using seccomp. Once seccomp is
560 enabled via /proc/<pid>/seccomp, it cannot be disabled
561 and the task is only allowed to execute a few safe syscalls
562 defined by each seccomp mode.
568 menu "Power Management"
570 config ARCH_HIBERNATION_POSSIBLE
573 source "kernel/power/Kconfig"
585 source "drivers/Kconfig"
589 source "arch/s390/Kconfig.debug"
591 source "security/Kconfig"
593 source "crypto/Kconfig"
597 menu "Virtualization"
601 prompt "Pseudo page fault support"
603 Select this option, if you want to use PFAULT pseudo page fault
604 handling under VM. If running native or in LPAR, this option
605 has no effect. If your VM does not support PFAULT, PAGEEX
606 pseudo page fault handling will be used.
607 Note that VM 4.2 supports PFAULT but has a bug in its
608 implementation that causes some problems.
609 Everybody who wants to run Linux under VM != VM4.2 should select
613 bool "VM shared kernel support"
614 depends on !JUMP_LABEL
616 Select this option, if you want to share the text segment of the
617 Linux kernel between different VM guests. This reduces memory
618 usage with lots of guests but greatly increases kernel size.
619 Also if a kernel was IPL'ed from a shared segment the kexec system
621 You should only select this option if you know what you are
622 doing and want to exploit this feature.
626 prompt "Cooperative memory management"
628 Select this option, if you want to enable the kernel interface
629 to reduce the memory size of the system. This is accomplished
630 by allocating pages of memory and put them "on hold". This only
631 makes sense for a system running under VM where the unused pages
632 will be reused by VM for other guest systems. The interface
633 allows an external monitor to balance memory of many systems.
634 Everybody who wants to run Linux under VM should select this
639 prompt "IUCV special message interface to cooperative memory management"
640 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
642 Select this option to enable the special message interface to
643 the cooperative memory management.
647 prompt "Linux - VM Monitor Stream, base infrastructure"
650 This provides a kernel interface for creating and updating z/VM APPLDATA
651 monitor records. The monitor records are updated at certain time
652 intervals, once the timer is started.
653 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
654 i.e. enables or disables monitoring on the Linux side.
655 A custom interval value (in seconds) can be written to
656 /proc/appldata/interval.
658 Defaults are 60 seconds interval and timer off.
659 The /proc entries can also be read from, showing the current settings.
663 prompt "Monitor memory management statistics"
664 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
666 This provides memory management related data to the Linux - VM Monitor
667 Stream, like paging/swapping rate, memory utilisation, etc.
668 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
669 APPLDATA monitor record, i.e. enables or disables monitoring this record
673 The /proc entry can also be read from, showing the current settings.
675 This can also be compiled as a module, which will be called
680 prompt "Monitor OS statistics"
681 depends on APPLDATA_BASE
683 This provides OS related data to the Linux - VM Monitor Stream, like
684 CPU utilisation, etc.
685 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
686 APPLDATA monitor record, i.e. enables or disables monitoring this record
690 This can also be compiled as a module, which will be called
693 config APPLDATA_NET_SUM
695 prompt "Monitor overall network statistics"
696 depends on APPLDATA_BASE && NET
698 This provides network related data to the Linux - VM Monitor Stream,
699 currently there is only a total sum of network I/O statistics, no
701 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
702 APPLDATA monitor record, i.e. enables or disables monitoring this record
706 This can also be compiled as a module, which will be called
711 prompt "s390 hypervisor file system support"
712 select SYS_HYPERVISOR
714 This is a virtual file system intended to provide accounting
715 information in an s390 hypervisor environment.
717 source "arch/s390/kvm/Kconfig"
721 prompt "s390 support for virtio devices"
724 select VIRTUALIZATION
726 select VIRTIO_CONSOLE
728 Enabling this option adds support for virtio based paravirtual device
731 Select this option if you want to run the kernel as a guest under