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
81 select HAVE_PERF_EVENTS
82 select ARCH_HAVE_NMI_SAFE_CMPXCHG
83 select HAVE_DEBUG_KMEMLEAK
84 select HAVE_KERNEL_GZIP
85 select HAVE_KERNEL_BZIP2
86 select HAVE_KERNEL_LZMA
87 select HAVE_KERNEL_LZO
89 select HAVE_ARCH_MUTEX_CPU_RELAX
90 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
91 select HAVE_BPF_JIT if 64BIT && PACK_STACK
92 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
93 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
95 select HAVE_MEMBLOCK_NODE_MAP
96 select HAVE_CMPXCHG_LOCAL
97 select HAVE_CMPXCHG_DOUBLE
98 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
99 select HAVE_VIRT_CPU_ACCOUNTING
100 select VIRT_CPU_ACCOUNTING
101 select ARCH_DISCARD_MEMBLOCK
102 select BUILDTIME_EXTABLE_SORT
103 select ARCH_INLINE_SPIN_TRYLOCK
104 select ARCH_INLINE_SPIN_TRYLOCK_BH
105 select ARCH_INLINE_SPIN_LOCK
106 select ARCH_INLINE_SPIN_LOCK_BH
107 select ARCH_INLINE_SPIN_LOCK_IRQ
108 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
109 select ARCH_INLINE_SPIN_UNLOCK
110 select ARCH_INLINE_SPIN_UNLOCK_BH
111 select ARCH_INLINE_SPIN_UNLOCK_IRQ
112 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_READ_TRYLOCK
114 select ARCH_INLINE_READ_LOCK
115 select ARCH_INLINE_READ_LOCK_BH
116 select ARCH_INLINE_READ_LOCK_IRQ
117 select ARCH_INLINE_READ_LOCK_IRQSAVE
118 select ARCH_INLINE_READ_UNLOCK
119 select ARCH_INLINE_READ_UNLOCK_BH
120 select ARCH_INLINE_READ_UNLOCK_IRQ
121 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
122 select ARCH_INLINE_WRITE_TRYLOCK
123 select ARCH_INLINE_WRITE_LOCK
124 select ARCH_INLINE_WRITE_LOCK_BH
125 select ARCH_INLINE_WRITE_LOCK_IRQ
126 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
127 select ARCH_INLINE_WRITE_UNLOCK
128 select ARCH_INLINE_WRITE_UNLOCK_BH
129 select ARCH_INLINE_WRITE_UNLOCK_IRQ
130 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
131 select HAVE_UID16 if 32BIT
132 select ARCH_WANT_IPC_PARSE_VERSION
133 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
134 select GENERIC_SMP_IDLE_THREAD
135 select GENERIC_TIME_VSYSCALL_OLD
136 select GENERIC_CLOCKEVENTS
137 select KTIME_SCALAR if 32BIT
138 select HAVE_ARCH_SECCOMP_FILTER
139 select HAVE_MOD_ARCH_SPECIFIC
140 select MODULES_USE_ELF_RELA
141 select CLONE_BACKWARDS2
143 config SCHED_OMIT_FRAME_POINTER
146 source "init/Kconfig"
148 source "kernel/Kconfig.freezer"
150 menu "Processor type and features"
152 config HAVE_MARCH_Z900_FEATURES
155 config HAVE_MARCH_Z990_FEATURES
157 select HAVE_MARCH_Z900_FEATURES
159 config HAVE_MARCH_Z9_109_FEATURES
161 select HAVE_MARCH_Z990_FEATURES
163 config HAVE_MARCH_Z10_FEATURES
165 select HAVE_MARCH_Z9_109_FEATURES
167 config HAVE_MARCH_Z196_FEATURES
169 select HAVE_MARCH_Z10_FEATURES
171 config HAVE_MARCH_ZEC12_FEATURES
173 select HAVE_MARCH_Z196_FEATURES
176 prompt "Processor type"
180 bool "System/390 model G5 and G6"
183 Select this to build a 31 bit kernel that works
184 on all ESA/390 and z/Architecture machines.
187 bool "IBM zSeries model z800 and z900"
188 select HAVE_MARCH_Z900_FEATURES if 64BIT
190 Select this to enable optimizations for model z800/z900 (2064 and
191 2066 series). This will enable some optimizations that are not
192 available on older ESA/390 (31 Bit) only CPUs.
195 bool "IBM zSeries model z890 and z990"
196 select HAVE_MARCH_Z990_FEATURES if 64BIT
198 Select this to enable optimizations for model z890/z990 (2084 and
199 2086 series). The kernel will be slightly faster but will not work
204 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
206 Select this to enable optimizations for IBM System z9 (2094 and
207 2096 series). The kernel will be slightly faster but will not work
211 bool "IBM System z10"
212 select HAVE_MARCH_Z10_FEATURES if 64BIT
214 Select this to enable optimizations for IBM System z10 (2097 and
215 2098 series). The kernel will be slightly faster but will not work
219 bool "IBM zEnterprise 114 and 196"
220 select HAVE_MARCH_Z196_FEATURES if 64BIT
222 Select this to enable optimizations for IBM zEnterprise 114 and 196
223 (2818 and 2817 series). The kernel will be slightly faster but will
224 not work on older machines.
228 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
230 Select this to enable optimizations for IBM zEC12 (2827 series). The
231 kernel will be slightly faster but will not work on older machines.
237 prompt "64 bit kernel"
239 Select this option if you have an IBM z/Architecture machine
240 and want to use the 64 bit addressing mode.
247 prompt "Kernel support for 31 bit emulation"
249 select COMPAT_BINFMT_ELF if BINFMT_ELF
250 select ARCH_WANT_OLD_COMPAT_IPC
252 Select this option if you want to enable your system kernel to
253 handle system-calls from ELF binaries for 31 bit ESA. This option
254 (and some other stuff like libraries and such) is needed for
255 executing 31 bit applications. It is safe to say "Y".
257 config SYSVIPC_COMPAT
258 def_bool y if COMPAT && SYSVIPC
261 def_bool y if COMPAT && KEYS
265 prompt "Symmetric multi-processing support"
267 This enables support for systems with more than one CPU. If you have
268 a system with only one CPU, like most personal computers, say N. If
269 you have a system with more than one CPU, say Y.
271 If you say N here, the kernel will run on single and multiprocessor
272 machines, but will use only one CPU of a multiprocessor machine. If
273 you say Y here, the kernel will run on many, but not all,
274 singleprocessor machines. On a singleprocessor machine, the kernel
275 will run faster if you say N here.
277 See also the SMP-HOWTO available at
278 <http://www.tldp.org/docs.html#howto>.
280 Even if you don't know what to do here, say Y.
283 int "Maximum number of CPUs (2-64)"
286 default "32" if !64BIT
287 default "64" if 64BIT
289 This allows you to specify the maximum number of CPUs which this
290 kernel will support. The maximum supported value is 64 and the
291 minimum value which makes sense is 2.
293 This is purely to save memory - each supported CPU adds
294 approximately sixteen kilobytes to the kernel image.
298 prompt "Support for hot-pluggable CPUs"
302 Say Y here to be able to turn CPUs off and on. CPUs
303 can be controlled through /sys/devices/system/cpu/cpu#.
304 Say N if you want to disable CPU hotplug.
311 prompt "Book scheduler support"
315 Book scheduler support improves the CPU scheduler's decision making
316 when dealing with machines that have several books.
318 source kernel/Kconfig.preempt
322 prompt "IEEE FPU emulation"
325 This option is required for IEEE compliant floating point arithmetic
326 on older ESA/390 machines. Say Y unless you know your machine doesn't
329 source kernel/Kconfig.hz
335 config ARCH_SPARSEMEM_ENABLE
337 select SPARSEMEM_VMEMMAP_ENABLE
338 select SPARSEMEM_VMEMMAP
339 select SPARSEMEM_STATIC if !64BIT
341 config ARCH_SPARSEMEM_DEFAULT
344 config ARCH_SELECT_MEMORY_MODEL
347 config ARCH_ENABLE_MEMORY_HOTPLUG
348 def_bool y if SPARSEMEM
350 config ARCH_ENABLE_MEMORY_HOTREMOVE
353 config FORCE_MAX_ZONEORDER
361 prompt "Pack kernel stack"
363 This option enables the compiler option -mkernel-backchain if it
364 is available. If the option is available the compiler supports
365 the new stack layout which dramatically reduces the minimum stack
366 frame size. With an old compiler a non-leaf function needs a
367 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
368 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
369 and 24 byte on 64 bit.
371 Say Y if you are unsure.
375 prompt "Use 8kb for kernel stack instead of 16kb"
376 depends on PACK_STACK && 64BIT && !LOCKDEP
378 If you say Y here and the compiler supports the -mkernel-backchain
379 option the kernel will use a smaller kernel stack size. The reduced
380 size is 8kb instead of 16kb. This allows to run more threads on a
381 system and reduces the pressure on the memory management for higher
382 order page allocations.
384 Say N if you are unsure.
388 prompt "Detect kernel stack overflow"
390 This option enables the compiler option -mstack-guard and
391 -mstack-size if they are available. If the compiler supports them
392 it will emit additional code to each function prolog to trigger
393 an illegal operation if the kernel stack is about to overflow.
395 Say N if you are unsure.
398 int "Size of the guard area (128-1024)"
400 depends on CHECK_STACK
403 This allows you to specify the size of the guard area at the lower
404 end of the kernel stack. If the kernel stack points into the guard
405 area on function entry an illegal operation is triggered. The size
406 needs to be a power of 2. Please keep in mind that the size of an
407 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
408 The minimum size for the stack guard should be 256 for 31 bit and
411 config WARN_DYNAMIC_STACK
413 prompt "Emit compiler warnings for function with dynamic stack usage"
415 This option enables the compiler option -mwarn-dynamicstack. If the
416 compiler supports this options generates warnings for functions
417 that dynamically allocate stack space using alloca.
419 Say N if you are unsure.
427 prompt "QDIO support"
429 This driver provides the Queued Direct I/O base support for
432 To compile this driver as a module, choose M here: the
433 module will be called qdio.
441 select ARCH_SUPPORTS_MSI
448 config PCI_NR_FUNCTIONS
449 int "Maximum number of PCI functions (1-4096)"
453 This allows you to specify the maximum number of PCI functions which
454 this kernel will support.
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
528 Generate crash dump after being started by kexec.
529 Crash dump kernels are loaded in the main kernel with kexec-tools
530 into a specially reserved region and then later executed after
531 a crash by kdump/kexec.
532 For more details see Documentation/kdump/kdump.txt
536 prompt "zfcpdump support"
539 Select this option if you want to build an zfcpdump enabled kernel.
540 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
544 menu "Executable file formats / Emulations"
546 source "fs/Kconfig.binfmt"
550 prompt "Enable seccomp to safely compute untrusted bytecode"
553 This kernel feature is useful for number crunching applications
554 that may need to compute untrusted bytecode during their
555 execution. By using pipes or other transports made available to
556 the process as file descriptors supporting the read/write
557 syscalls, it's possible to isolate those applications in
558 their own address space using seccomp. Once seccomp is
559 enabled via /proc/<pid>/seccomp, it cannot be disabled
560 and the task is only allowed to execute a few safe syscalls
561 defined by each seccomp mode.
567 menu "Power Management"
569 config ARCH_HIBERNATION_POSSIBLE
572 source "kernel/power/Kconfig"
584 source "drivers/Kconfig"
588 source "arch/s390/Kconfig.debug"
590 source "security/Kconfig"
592 source "crypto/Kconfig"
596 menu "Virtualization"
600 prompt "Pseudo page fault support"
602 Select this option, if you want to use PFAULT pseudo page fault
603 handling under VM. If running native or in LPAR, this option
604 has no effect. If your VM does not support PFAULT, PAGEEX
605 pseudo page fault handling will be used.
606 Note that VM 4.2 supports PFAULT but has a bug in its
607 implementation that causes some problems.
608 Everybody who wants to run Linux under VM != VM4.2 should select
612 bool "VM shared kernel support"
613 depends on !JUMP_LABEL
615 Select this option, if you want to share the text segment of the
616 Linux kernel between different VM guests. This reduces memory
617 usage with lots of guests but greatly increases kernel size.
618 Also if a kernel was IPL'ed from a shared segment the kexec system
620 You should only select this option if you know what you are
621 doing and want to exploit this feature.
625 prompt "Cooperative memory management"
627 Select this option, if you want to enable the kernel interface
628 to reduce the memory size of the system. This is accomplished
629 by allocating pages of memory and put them "on hold". This only
630 makes sense for a system running under VM where the unused pages
631 will be reused by VM for other guest systems. The interface
632 allows an external monitor to balance memory of many systems.
633 Everybody who wants to run Linux under VM should select this
638 prompt "IUCV special message interface to cooperative memory management"
639 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
641 Select this option to enable the special message interface to
642 the cooperative memory management.
646 prompt "Linux - VM Monitor Stream, base infrastructure"
649 This provides a kernel interface for creating and updating z/VM APPLDATA
650 monitor records. The monitor records are updated at certain time
651 intervals, once the timer is started.
652 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
653 i.e. enables or disables monitoring on the Linux side.
654 A custom interval value (in seconds) can be written to
655 /proc/appldata/interval.
657 Defaults are 60 seconds interval and timer off.
658 The /proc entries can also be read from, showing the current settings.
662 prompt "Monitor memory management statistics"
663 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
665 This provides memory management related data to the Linux - VM Monitor
666 Stream, like paging/swapping rate, memory utilisation, etc.
667 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
668 APPLDATA monitor record, i.e. enables or disables monitoring this record
672 The /proc entry can also be read from, showing the current settings.
674 This can also be compiled as a module, which will be called
679 prompt "Monitor OS statistics"
680 depends on APPLDATA_BASE
682 This provides OS related data to the Linux - VM Monitor Stream, like
683 CPU utilisation, etc.
684 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
685 APPLDATA monitor record, i.e. enables or disables monitoring this record
689 This can also be compiled as a module, which will be called
692 config APPLDATA_NET_SUM
694 prompt "Monitor overall network statistics"
695 depends on APPLDATA_BASE && NET
697 This provides network related data to the Linux - VM Monitor Stream,
698 currently there is only a total sum of network I/O statistics, no
700 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
701 APPLDATA monitor record, i.e. enables or disables monitoring this record
705 This can also be compiled as a module, which will be called
710 prompt "s390 hypervisor file system support"
711 select SYS_HYPERVISOR
713 This is a virtual file system intended to provide accounting
714 information in an s390 hypervisor environment.
716 source "arch/s390/kvm/Kconfig"
720 prompt "s390 support for virtio devices (EXPERIMENTAL)"
721 depends on 64BIT && EXPERIMENTAL
722 select VIRTUALIZATION
724 select VIRTIO_CONSOLE
726 Enabling this option adds support for virtio based paravirtual device
729 Select this option if you want to run the kernel as a guest under