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 USE_GENERIC_SMP_HELPERS if SMP
64 select GENERIC_CPU_DEVICES if !SMP
65 select HAVE_SYSCALL_WRAPPERS
66 select HAVE_FUNCTION_TRACER
67 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
68 select HAVE_FTRACE_MCOUNT_RECORD
69 select HAVE_C_RECORDMCOUNT
70 select HAVE_SYSCALL_TRACEPOINTS
71 select SYSCTL_EXCEPTION_TRACE
72 select HAVE_DYNAMIC_FTRACE
73 select HAVE_FUNCTION_GRAPH_TRACER
74 select HAVE_REGS_AND_STACK_ACCESS_API
77 select HAVE_KRETPROBES
78 select HAVE_KVM if 64BIT
79 select HAVE_ARCH_TRACEHOOK
80 select INIT_ALL_POSSIBLE
82 select HAVE_PERF_EVENTS
83 select ARCH_HAVE_NMI_SAFE_CMPXCHG
84 select HAVE_DEBUG_KMEMLEAK
85 select HAVE_KERNEL_GZIP
86 select HAVE_KERNEL_BZIP2
87 select HAVE_KERNEL_LZMA
88 select HAVE_KERNEL_LZO
90 select HAVE_ARCH_MUTEX_CPU_RELAX
91 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
92 select HAVE_BPF_JIT if 64BIT && PACK_STACK
93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
94 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
96 select HAVE_MEMBLOCK_NODE_MAP
97 select HAVE_CMPXCHG_LOCAL
98 select HAVE_CMPXCHG_DOUBLE
99 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
100 select HAVE_VIRT_CPU_ACCOUNTING
101 select VIRT_CPU_ACCOUNTING
102 select ARCH_DISCARD_MEMBLOCK
103 select BUILDTIME_EXTABLE_SORT
104 select ARCH_INLINE_SPIN_TRYLOCK
105 select ARCH_INLINE_SPIN_TRYLOCK_BH
106 select ARCH_INLINE_SPIN_LOCK
107 select ARCH_INLINE_SPIN_LOCK_BH
108 select ARCH_INLINE_SPIN_LOCK_IRQ
109 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
110 select ARCH_INLINE_SPIN_UNLOCK
111 select ARCH_INLINE_SPIN_UNLOCK_BH
112 select ARCH_INLINE_SPIN_UNLOCK_IRQ
113 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
114 select ARCH_INLINE_READ_TRYLOCK
115 select ARCH_INLINE_READ_LOCK
116 select ARCH_INLINE_READ_LOCK_BH
117 select ARCH_INLINE_READ_LOCK_IRQ
118 select ARCH_INLINE_READ_LOCK_IRQSAVE
119 select ARCH_INLINE_READ_UNLOCK
120 select ARCH_INLINE_READ_UNLOCK_BH
121 select ARCH_INLINE_READ_UNLOCK_IRQ
122 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
123 select ARCH_INLINE_WRITE_TRYLOCK
124 select ARCH_INLINE_WRITE_LOCK
125 select ARCH_INLINE_WRITE_LOCK_BH
126 select ARCH_INLINE_WRITE_LOCK_IRQ
127 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
128 select ARCH_INLINE_WRITE_UNLOCK
129 select ARCH_INLINE_WRITE_UNLOCK_BH
130 select ARCH_INLINE_WRITE_UNLOCK_IRQ
131 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
132 select HAVE_UID16 if 32BIT
133 select ARCH_WANT_IPC_PARSE_VERSION
134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
135 select GENERIC_SMP_IDLE_THREAD
136 select GENERIC_TIME_VSYSCALL_OLD
137 select GENERIC_CLOCKEVENTS
138 select KTIME_SCALAR if 32BIT
139 select HAVE_ARCH_SECCOMP_FILTER
140 select GENERIC_KERNEL_THREAD
141 select GENERIC_KERNEL_EXECVE
142 select HAVE_MOD_ARCH_SPECIFIC
143 select MODULES_USE_ELF_RELA
144 select CLONE_BACKWARDS2
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
255 Select this option if you want to enable your system kernel to
256 handle system-calls from ELF binaries for 31 bit ESA. This option
257 (and some other stuff like libraries and such) is needed for
258 executing 31 bit applications. It is safe to say "Y".
260 config SYSVIPC_COMPAT
261 def_bool y if COMPAT && SYSVIPC
264 def_bool y if COMPAT && KEYS
268 prompt "Symmetric multi-processing support"
270 This enables support for systems with more than one CPU. If you have
271 a system with only one CPU, like most personal computers, say N. If
272 you have a system with more than one CPU, say Y.
274 If you say N here, the kernel will run on single and multiprocessor
275 machines, but will use only one CPU of a multiprocessor machine. If
276 you say Y here, the kernel will run on many, but not all,
277 singleprocessor machines. On a singleprocessor machine, the kernel
278 will run faster if you say N here.
280 See also the SMP-HOWTO available at
281 <http://www.tldp.org/docs.html#howto>.
283 Even if you don't know what to do here, say Y.
286 int "Maximum number of CPUs (2-64)"
289 default "32" if !64BIT
290 default "64" if 64BIT
292 This allows you to specify the maximum number of CPUs which this
293 kernel will support. The maximum supported value is 64 and the
294 minimum value which makes sense is 2.
296 This is purely to save memory - each supported CPU adds
297 approximately sixteen kilobytes to the kernel image.
301 prompt "Support for hot-pluggable CPUs"
305 Say Y here to be able to turn CPUs off and on. CPUs
306 can be controlled through /sys/devices/system/cpu/cpu#.
307 Say N if you want to disable CPU hotplug.
314 prompt "Book scheduler support"
318 Book scheduler support improves the CPU scheduler's decision making
319 when dealing with machines that have several books.
321 source kernel/Kconfig.preempt
325 prompt "IEEE FPU emulation"
328 This option is required for IEEE compliant floating point arithmetic
329 on older ESA/390 machines. Say Y unless you know your machine doesn't
332 source kernel/Kconfig.hz
338 config ARCH_SPARSEMEM_ENABLE
340 select SPARSEMEM_VMEMMAP_ENABLE
341 select SPARSEMEM_VMEMMAP
342 select SPARSEMEM_STATIC if !64BIT
344 config ARCH_SPARSEMEM_DEFAULT
347 config ARCH_SELECT_MEMORY_MODEL
350 config ARCH_ENABLE_MEMORY_HOTPLUG
351 def_bool y if SPARSEMEM
353 config ARCH_ENABLE_MEMORY_HOTREMOVE
356 config FORCE_MAX_ZONEORDER
364 prompt "Pack kernel stack"
366 This option enables the compiler option -mkernel-backchain if it
367 is available. If the option is available the compiler supports
368 the new stack layout which dramatically reduces the minimum stack
369 frame size. With an old compiler a non-leaf function needs a
370 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
371 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
372 and 24 byte on 64 bit.
374 Say Y if you are unsure.
378 prompt "Use 8kb for kernel stack instead of 16kb"
379 depends on PACK_STACK && 64BIT && !LOCKDEP
381 If you say Y here and the compiler supports the -mkernel-backchain
382 option the kernel will use a smaller kernel stack size. The reduced
383 size is 8kb instead of 16kb. This allows to run more threads on a
384 system and reduces the pressure on the memory management for higher
385 order page allocations.
387 Say N if you are unsure.
391 prompt "Detect kernel stack overflow"
393 This option enables the compiler option -mstack-guard and
394 -mstack-size if they are available. If the compiler supports them
395 it will emit additional code to each function prolog to trigger
396 an illegal operation if the kernel stack is about to overflow.
398 Say N if you are unsure.
401 int "Size of the guard area (128-1024)"
403 depends on CHECK_STACK
406 This allows you to specify the size of the guard area at the lower
407 end of the kernel stack. If the kernel stack points into the guard
408 area on function entry an illegal operation is triggered. The size
409 needs to be a power of 2. Please keep in mind that the size of an
410 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
411 The minimum size for the stack guard should be 256 for 31 bit and
414 config WARN_DYNAMIC_STACK
416 prompt "Emit compiler warnings for function with dynamic stack usage"
418 This option enables the compiler option -mwarn-dynamicstack. If the
419 compiler supports this options generates warnings for functions
420 that dynamically allocate stack space using alloca.
422 Say N if you are unsure.
430 prompt "QDIO support"
432 This driver provides the Queued Direct I/O base support for
435 To compile this driver as a module, choose M here: the
436 module will be called qdio.
444 select ARCH_SUPPORTS_MSI
451 config PCI_NR_FUNCTIONS
452 int "Maximum number of PCI functions (1-4096)"
456 This allows you to specify the maximum number of PCI functions which
457 this kernel will support.
459 source "drivers/pci/Kconfig"
460 source "drivers/pci/pcie/Kconfig"
461 source "drivers/pci/hotplug/Kconfig"
476 select HAVE_DMA_API_DEBUG
478 config NEED_SG_DMA_LENGTH
481 config HAVE_DMA_ATTRS
484 config NEED_DMA_MAP_STATE
489 prompt "Support for CHSC subchannels"
491 This driver allows usage of CHSC subchannels. A CHSC subchannel
492 is usually present on LPAR only.
493 The driver creates a device /dev/chsc, which may be used to
494 obtain I/O configuration information about the machine and
495 to issue asynchronous chsc commands (DANGEROUS).
496 You will usually only want to use this interface on a special
497 LPAR designated for system management.
499 To compile this driver as a module, choose M here: the
500 module will be called chsc_sch.
507 prompt "SCM bus driver"
509 Bus driver for Storage Class Memory.
513 prompt "Support for EADM subchannels"
516 This driver allows usage of EADM subchannels. EADM subchannels act
517 as a communication vehicle for SCM increments.
519 To compile this driver as a module, choose M here: the
520 module will be called eadm_sch.
527 bool "kernel crash dumps"
528 depends on 64BIT && SMP
531 Generate crash dump after being started by kexec.
532 Crash dump kernels are loaded in the main kernel with kexec-tools
533 into a specially reserved region and then later executed after
534 a crash by kdump/kexec.
535 For more details see Documentation/kdump/kdump.txt
539 prompt "zfcpdump support"
542 Select this option if you want to build an zfcpdump enabled kernel.
543 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
547 menu "Executable file formats / Emulations"
549 source "fs/Kconfig.binfmt"
553 prompt "Enable seccomp to safely compute untrusted bytecode"
556 This kernel feature is useful for number crunching applications
557 that may need to compute untrusted bytecode during their
558 execution. By using pipes or other transports made available to
559 the process as file descriptors supporting the read/write
560 syscalls, it's possible to isolate those applications in
561 their own address space using seccomp. Once seccomp is
562 enabled via /proc/<pid>/seccomp, it cannot be disabled
563 and the task is only allowed to execute a few safe syscalls
564 defined by each seccomp mode.
570 menu "Power Management"
572 config ARCH_HIBERNATION_POSSIBLE
575 source "kernel/power/Kconfig"
587 source "drivers/Kconfig"
591 source "arch/s390/Kconfig.debug"
593 source "security/Kconfig"
595 source "crypto/Kconfig"
599 menu "Virtualization"
603 prompt "Pseudo page fault support"
605 Select this option, if you want to use PFAULT pseudo page fault
606 handling under VM. If running native or in LPAR, this option
607 has no effect. If your VM does not support PFAULT, PAGEEX
608 pseudo page fault handling will be used.
609 Note that VM 4.2 supports PFAULT but has a bug in its
610 implementation that causes some problems.
611 Everybody who wants to run Linux under VM != VM4.2 should select
615 bool "VM shared kernel support"
616 depends on !JUMP_LABEL
618 Select this option, if you want to share the text segment of the
619 Linux kernel between different VM guests. This reduces memory
620 usage with lots of guests but greatly increases kernel size.
621 Also if a kernel was IPL'ed from a shared segment the kexec system
623 You should only select this option if you know what you are
624 doing and want to exploit this feature.
628 prompt "Cooperative memory management"
630 Select this option, if you want to enable the kernel interface
631 to reduce the memory size of the system. This is accomplished
632 by allocating pages of memory and put them "on hold". This only
633 makes sense for a system running under VM where the unused pages
634 will be reused by VM for other guest systems. The interface
635 allows an external monitor to balance memory of many systems.
636 Everybody who wants to run Linux under VM should select this
641 prompt "IUCV special message interface to cooperative memory management"
642 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
644 Select this option to enable the special message interface to
645 the cooperative memory management.
649 prompt "Linux - VM Monitor Stream, base infrastructure"
652 This provides a kernel interface for creating and updating z/VM APPLDATA
653 monitor records. The monitor records are updated at certain time
654 intervals, once the timer is started.
655 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
656 i.e. enables or disables monitoring on the Linux side.
657 A custom interval value (in seconds) can be written to
658 /proc/appldata/interval.
660 Defaults are 60 seconds interval and timer off.
661 The /proc entries can also be read from, showing the current settings.
665 prompt "Monitor memory management statistics"
666 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
668 This provides memory management related data to the Linux - VM Monitor
669 Stream, like paging/swapping rate, memory utilisation, etc.
670 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
671 APPLDATA monitor record, i.e. enables or disables monitoring this record
675 The /proc entry can also be read from, showing the current settings.
677 This can also be compiled as a module, which will be called
682 prompt "Monitor OS statistics"
683 depends on APPLDATA_BASE
685 This provides OS related data to the Linux - VM Monitor Stream, like
686 CPU utilisation, etc.
687 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
688 APPLDATA monitor record, i.e. enables or disables monitoring this record
692 This can also be compiled as a module, which will be called
695 config APPLDATA_NET_SUM
697 prompt "Monitor overall network statistics"
698 depends on APPLDATA_BASE && NET
700 This provides network related data to the Linux - VM Monitor Stream,
701 currently there is only a total sum of network I/O statistics, no
703 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
704 APPLDATA monitor record, i.e. enables or disables monitoring this record
708 This can also be compiled as a module, which will be called
713 prompt "s390 hypervisor file system support"
714 select SYS_HYPERVISOR
716 This is a virtual file system intended to provide accounting
717 information in an s390 hypervisor environment.
719 source "arch/s390/kvm/Kconfig"
723 prompt "s390 support for virtio devices (EXPERIMENTAL)"
724 depends on 64BIT && EXPERIMENTAL
725 select VIRTUALIZATION
727 select VIRTIO_CONSOLE
729 Enabling this option adds support for virtio based paravirtual device
732 Select this option if you want to run the kernel as a guest under