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
43 config ARCH_DMA_ADDR_T_64BIT
46 config GENERIC_LOCKBREAK
47 def_bool y if SMP && PREEMPT
52 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_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 GENERIC_SMP_IDLE_THREAD
134 select GENERIC_TIME_VSYSCALL_OLD
135 select GENERIC_CLOCKEVENTS
136 select KTIME_SCALAR if 32BIT
137 select HAVE_ARCH_SECCOMP_FILTER
138 select GENERIC_KERNEL_THREAD
139 select HAVE_MOD_ARCH_SPECIFIC
140 select MODULES_USE_ELF_RELA
142 config SCHED_OMIT_FRAME_POINTER
145 source "init/Kconfig"
147 source "kernel/Kconfig.freezer"
149 menu "Processor type and features"
151 config HAVE_MARCH_Z900_FEATURES
154 config HAVE_MARCH_Z990_FEATURES
156 select HAVE_MARCH_Z900_FEATURES
158 config HAVE_MARCH_Z9_109_FEATURES
160 select HAVE_MARCH_Z990_FEATURES
162 config HAVE_MARCH_Z10_FEATURES
164 select HAVE_MARCH_Z9_109_FEATURES
166 config HAVE_MARCH_Z196_FEATURES
168 select HAVE_MARCH_Z10_FEATURES
171 prompt "Processor type"
175 bool "System/390 model G5 and G6"
178 Select this to build a 31 bit kernel that works
179 on all ESA/390 and z/Architecture machines.
182 bool "IBM zSeries model z800 and z900"
183 select HAVE_MARCH_Z900_FEATURES if 64BIT
185 Select this to enable optimizations for model z800/z900 (2064 and
186 2066 series). This will enable some optimizations that are not
187 available on older ESA/390 (31 Bit) only CPUs.
190 bool "IBM zSeries model z890 and z990"
191 select HAVE_MARCH_Z990_FEATURES if 64BIT
193 Select this to enable optimizations for model z890/z990 (2084 and
194 2086 series). The kernel will be slightly faster but will not work
199 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
201 Select this to enable optimizations for IBM System z9 (2094 and
202 2096 series). The kernel will be slightly faster but will not work
206 bool "IBM System z10"
207 select HAVE_MARCH_Z10_FEATURES if 64BIT
209 Select this to enable optimizations for IBM System z10 (2097 and
210 2098 series). The kernel will be slightly faster but will not work
214 bool "IBM zEnterprise 114 and 196"
215 select HAVE_MARCH_Z196_FEATURES if 64BIT
217 Select this to enable optimizations for IBM zEnterprise 114 and 196
218 (2818 and 2817 series). The kernel will be slightly faster but will
219 not work on older machines.
225 prompt "64 bit kernel"
227 Select this option if you have an IBM z/Architecture machine
228 and want to use the 64 bit addressing mode.
235 prompt "Kernel support for 31 bit emulation"
237 select COMPAT_BINFMT_ELF if BINFMT_ELF
238 select ARCH_WANT_OLD_COMPAT_IPC
240 Select this option if you want to enable your system kernel to
241 handle system-calls from ELF binaries for 31 bit ESA. This option
242 (and some other stuff like libraries and such) is needed for
243 executing 31 bit applications. It is safe to say "Y".
245 config SYSVIPC_COMPAT
246 def_bool y if COMPAT && SYSVIPC
249 def_bool y if COMPAT && KEYS
253 prompt "Symmetric multi-processing support"
255 This enables support for systems with more than one CPU. If you have
256 a system with only one CPU, like most personal computers, say N. If
257 you have a system with more than one CPU, say Y.
259 If you say N here, the kernel will run on single and multiprocessor
260 machines, but will use only one CPU of a multiprocessor machine. If
261 you say Y here, the kernel will run on many, but not all,
262 singleprocessor machines. On a singleprocessor machine, the kernel
263 will run faster if you say N here.
265 See also the SMP-HOWTO available at
266 <http://www.tldp.org/docs.html#howto>.
268 Even if you don't know what to do here, say Y.
271 int "Maximum number of CPUs (2-64)"
274 default "32" if !64BIT
275 default "64" if 64BIT
277 This allows you to specify the maximum number of CPUs which this
278 kernel will support. The maximum supported value is 64 and the
279 minimum value which makes sense is 2.
281 This is purely to save memory - each supported CPU adds
282 approximately sixteen kilobytes to the kernel image.
286 prompt "Support for hot-pluggable CPUs"
290 Say Y here to be able to turn CPUs off and on. CPUs
291 can be controlled through /sys/devices/system/cpu/cpu#.
292 Say N if you want to disable CPU hotplug.
299 prompt "Book scheduler support"
303 Book scheduler support improves the CPU scheduler's decision making
304 when dealing with machines that have several books.
306 source kernel/Kconfig.preempt
310 prompt "IEEE FPU emulation"
313 This option is required for IEEE compliant floating point arithmetic
314 on older ESA/390 machines. Say Y unless you know your machine doesn't
317 source kernel/Kconfig.hz
323 config ARCH_SPARSEMEM_ENABLE
325 select SPARSEMEM_VMEMMAP_ENABLE
326 select SPARSEMEM_VMEMMAP
327 select SPARSEMEM_STATIC if !64BIT
329 config ARCH_SPARSEMEM_DEFAULT
332 config ARCH_SELECT_MEMORY_MODEL
335 config ARCH_ENABLE_MEMORY_HOTPLUG
336 def_bool y if SPARSEMEM
338 config ARCH_ENABLE_MEMORY_HOTREMOVE
341 config FORCE_MAX_ZONEORDER
349 prompt "Pack kernel stack"
351 This option enables the compiler option -mkernel-backchain if it
352 is available. If the option is available the compiler supports
353 the new stack layout which dramatically reduces the minimum stack
354 frame size. With an old compiler a non-leaf function needs a
355 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
356 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
357 and 24 byte on 64 bit.
359 Say Y if you are unsure.
363 prompt "Use 8kb for kernel stack instead of 16kb"
364 depends on PACK_STACK && 64BIT && !LOCKDEP
366 If you say Y here and the compiler supports the -mkernel-backchain
367 option the kernel will use a smaller kernel stack size. The reduced
368 size is 8kb instead of 16kb. This allows to run more threads on a
369 system and reduces the pressure on the memory management for higher
370 order page allocations.
372 Say N if you are unsure.
376 prompt "Detect kernel stack overflow"
378 This option enables the compiler option -mstack-guard and
379 -mstack-size if they are available. If the compiler supports them
380 it will emit additional code to each function prolog to trigger
381 an illegal operation if the kernel stack is about to overflow.
383 Say N if you are unsure.
386 int "Size of the guard area (128-1024)"
388 depends on CHECK_STACK
391 This allows you to specify the size of the guard area at the lower
392 end of the kernel stack. If the kernel stack points into the guard
393 area on function entry an illegal operation is triggered. The size
394 needs to be a power of 2. Please keep in mind that the size of an
395 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
396 The minimum size for the stack guard should be 256 for 31 bit and
399 config WARN_DYNAMIC_STACK
401 prompt "Emit compiler warnings for function with dynamic stack usage"
403 This option enables the compiler option -mwarn-dynamicstack. If the
404 compiler supports this options generates warnings for functions
405 that dynamically allocate stack space using alloca.
407 Say N if you are unsure.
415 prompt "QDIO support"
417 This driver provides the Queued Direct I/O base support for
420 To compile this driver as a module, choose M here: the
421 module will be called qdio.
427 prompt "Support for CHSC subchannels"
429 This driver allows usage of CHSC subchannels. A CHSC subchannel
430 is usually present on LPAR only.
431 The driver creates a device /dev/chsc, which may be used to
432 obtain I/O configuration information about the machine and
433 to issue asynchronous chsc commands (DANGEROUS).
434 You will usually only want to use this interface on a special
435 LPAR designated for system management.
437 To compile this driver as a module, choose M here: the
438 module will be called chsc_sch.
445 prompt "SCM bus driver"
447 Bus driver for Storage Class Memory.
451 prompt "Support for EADM subchannels"
454 This driver allows usage of EADM subchannels. EADM subchannels act
455 as a communication vehicle for SCM increments.
457 To compile this driver as a module, choose M here: the
458 module will be called eadm_sch.
465 bool "kernel crash dumps"
466 depends on 64BIT && SMP
469 Generate crash dump after being started by kexec.
470 Crash dump kernels are loaded in the main kernel with kexec-tools
471 into a specially reserved region and then later executed after
472 a crash by kdump/kexec.
473 For more details see Documentation/kdump/kdump.txt
477 prompt "zfcpdump support"
480 Select this option if you want to build an zfcpdump enabled kernel.
481 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
485 menu "Executable file formats / Emulations"
487 source "fs/Kconfig.binfmt"
491 prompt "Enable seccomp to safely compute untrusted bytecode"
494 This kernel feature is useful for number crunching applications
495 that may need to compute untrusted bytecode during their
496 execution. By using pipes or other transports made available to
497 the process as file descriptors supporting the read/write
498 syscalls, it's possible to isolate those applications in
499 their own address space using seccomp. Once seccomp is
500 enabled via /proc/<pid>/seccomp, it cannot be disabled
501 and the task is only allowed to execute a few safe syscalls
502 defined by each seccomp mode.
508 menu "Power Management"
510 config ARCH_HIBERNATION_POSSIBLE
513 source "kernel/power/Kconfig"
525 source "drivers/Kconfig"
529 source "arch/s390/Kconfig.debug"
531 source "security/Kconfig"
533 source "crypto/Kconfig"
537 menu "Virtualization"
541 prompt "Pseudo page fault support"
543 Select this option, if you want to use PFAULT pseudo page fault
544 handling under VM. If running native or in LPAR, this option
545 has no effect. If your VM does not support PFAULT, PAGEEX
546 pseudo page fault handling will be used.
547 Note that VM 4.2 supports PFAULT but has a bug in its
548 implementation that causes some problems.
549 Everybody who wants to run Linux under VM != VM4.2 should select
553 bool "VM shared kernel support"
554 depends on !JUMP_LABEL
556 Select this option, if you want to share the text segment of the
557 Linux kernel between different VM guests. This reduces memory
558 usage with lots of guests but greatly increases kernel size.
559 Also if a kernel was IPL'ed from a shared segment the kexec system
561 You should only select this option if you know what you are
562 doing and want to exploit this feature.
566 prompt "Cooperative memory management"
568 Select this option, if you want to enable the kernel interface
569 to reduce the memory size of the system. This is accomplished
570 by allocating pages of memory and put them "on hold". This only
571 makes sense for a system running under VM where the unused pages
572 will be reused by VM for other guest systems. The interface
573 allows an external monitor to balance memory of many systems.
574 Everybody who wants to run Linux under VM should select this
579 prompt "IUCV special message interface to cooperative memory management"
580 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
582 Select this option to enable the special message interface to
583 the cooperative memory management.
587 prompt "Linux - VM Monitor Stream, base infrastructure"
590 This provides a kernel interface for creating and updating z/VM APPLDATA
591 monitor records. The monitor records are updated at certain time
592 intervals, once the timer is started.
593 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
594 i.e. enables or disables monitoring on the Linux side.
595 A custom interval value (in seconds) can be written to
596 /proc/appldata/interval.
598 Defaults are 60 seconds interval and timer off.
599 The /proc entries can also be read from, showing the current settings.
603 prompt "Monitor memory management statistics"
604 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
606 This provides memory management related data to the Linux - VM Monitor
607 Stream, like paging/swapping rate, memory utilisation, etc.
608 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
609 APPLDATA monitor record, i.e. enables or disables monitoring this record
613 The /proc entry can also be read from, showing the current settings.
615 This can also be compiled as a module, which will be called
620 prompt "Monitor OS statistics"
621 depends on APPLDATA_BASE
623 This provides OS related data to the Linux - VM Monitor Stream, like
624 CPU utilisation, etc.
625 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
626 APPLDATA monitor record, i.e. enables or disables monitoring this record
630 This can also be compiled as a module, which will be called
633 config APPLDATA_NET_SUM
635 prompt "Monitor overall network statistics"
636 depends on APPLDATA_BASE && NET
638 This provides network related data to the Linux - VM Monitor Stream,
639 currently there is only a total sum of network I/O statistics, no
641 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
642 APPLDATA monitor record, i.e. enables or disables monitoring this record
646 This can also be compiled as a module, which will be called
651 prompt "s390 hypervisor file system support"
652 select SYS_HYPERVISOR
654 This is a virtual file system intended to provide accounting
655 information in an s390 hypervisor environment.
657 source "arch/s390/kvm/Kconfig"
661 prompt "s390 support for virtio devices (EXPERIMENTAL)"
662 depends on 64BIT && EXPERIMENTAL
663 select VIRTUALIZATION
665 select VIRTIO_CONSOLE
667 Enabling this option adds support for virtio based paravirtual device
670 Select this option if you want to run the kernel as a guest under