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 HAVE_DYNAMIC_FTRACE
72 select HAVE_FUNCTION_GRAPH_TRACER
73 select HAVE_REGS_AND_STACK_ACCESS_API
76 select HAVE_KRETPROBES
77 select HAVE_KVM if 64BIT
78 select HAVE_ARCH_TRACEHOOK
79 select INIT_ALL_POSSIBLE
81 select HAVE_PERF_EVENTS
82 select ARCH_HAVE_NMI_SAFE_CMPXCHG
83 select HAVE_KERNEL_GZIP
84 select HAVE_KERNEL_BZIP2
85 select HAVE_KERNEL_LZMA
86 select HAVE_KERNEL_LZO
88 select HAVE_ARCH_MUTEX_CPU_RELAX
89 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
90 select HAVE_BPF_JIT if 64BIT && PACK_STACK
91 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
92 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
94 select HAVE_MEMBLOCK_NODE_MAP
95 select HAVE_CMPXCHG_LOCAL
96 select HAVE_CMPXCHG_DOUBLE
97 select HAVE_VIRT_CPU_ACCOUNTING
98 select VIRT_CPU_ACCOUNTING
99 select ARCH_DISCARD_MEMBLOCK
100 select BUILDTIME_EXTABLE_SORT
101 select ARCH_INLINE_SPIN_TRYLOCK
102 select ARCH_INLINE_SPIN_TRYLOCK_BH
103 select ARCH_INLINE_SPIN_LOCK
104 select ARCH_INLINE_SPIN_LOCK_BH
105 select ARCH_INLINE_SPIN_LOCK_IRQ
106 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
107 select ARCH_INLINE_SPIN_UNLOCK
108 select ARCH_INLINE_SPIN_UNLOCK_BH
109 select ARCH_INLINE_SPIN_UNLOCK_IRQ
110 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
111 select ARCH_INLINE_READ_TRYLOCK
112 select ARCH_INLINE_READ_LOCK
113 select ARCH_INLINE_READ_LOCK_BH
114 select ARCH_INLINE_READ_LOCK_IRQ
115 select ARCH_INLINE_READ_LOCK_IRQSAVE
116 select ARCH_INLINE_READ_UNLOCK
117 select ARCH_INLINE_READ_UNLOCK_BH
118 select ARCH_INLINE_READ_UNLOCK_IRQ
119 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
120 select ARCH_INLINE_WRITE_TRYLOCK
121 select ARCH_INLINE_WRITE_LOCK
122 select ARCH_INLINE_WRITE_LOCK_BH
123 select ARCH_INLINE_WRITE_LOCK_IRQ
124 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
125 select ARCH_INLINE_WRITE_UNLOCK
126 select ARCH_INLINE_WRITE_UNLOCK_BH
127 select ARCH_INLINE_WRITE_UNLOCK_IRQ
128 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
129 select HAVE_UID16 if 32BIT
130 select ARCH_WANT_IPC_PARSE_VERSION
131 select GENERIC_SMP_IDLE_THREAD
132 select GENERIC_TIME_VSYSCALL
133 select GENERIC_CLOCKEVENTS
134 select KTIME_SCALAR if 32BIT
135 select HAVE_ARCH_SECCOMP_FILTER
137 config SCHED_OMIT_FRAME_POINTER
140 source "init/Kconfig"
142 source "kernel/Kconfig.freezer"
144 menu "Processor type and features"
146 config HAVE_MARCH_Z900_FEATURES
149 config HAVE_MARCH_Z990_FEATURES
151 select HAVE_MARCH_Z900_FEATURES
153 config HAVE_MARCH_Z9_109_FEATURES
155 select HAVE_MARCH_Z990_FEATURES
157 config HAVE_MARCH_Z10_FEATURES
159 select HAVE_MARCH_Z9_109_FEATURES
161 config HAVE_MARCH_Z196_FEATURES
163 select HAVE_MARCH_Z10_FEATURES
166 prompt "Processor type"
170 bool "System/390 model G5 and G6"
173 Select this to build a 31 bit kernel that works
174 on all ESA/390 and z/Architecture machines.
177 bool "IBM zSeries model z800 and z900"
178 select HAVE_MARCH_Z900_FEATURES if 64BIT
180 Select this to enable optimizations for model z800/z900 (2064 and
181 2066 series). This will enable some optimizations that are not
182 available on older ESA/390 (31 Bit) only CPUs.
185 bool "IBM zSeries model z890 and z990"
186 select HAVE_MARCH_Z990_FEATURES if 64BIT
188 Select this to enable optimizations for model z890/z990 (2084 and
189 2086 series). The kernel will be slightly faster but will not work
194 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
196 Select this to enable optimizations for IBM System z9 (2094 and
197 2096 series). The kernel will be slightly faster but will not work
201 bool "IBM System z10"
202 select HAVE_MARCH_Z10_FEATURES if 64BIT
204 Select this to enable optimizations for IBM System z10 (2097 and
205 2098 series). The kernel will be slightly faster but will not work
209 bool "IBM zEnterprise 114 and 196"
210 select HAVE_MARCH_Z196_FEATURES if 64BIT
212 Select this to enable optimizations for IBM zEnterprise 114 and 196
213 (2818 and 2817 series). The kernel will be slightly faster but will
214 not work on older machines.
220 prompt "64 bit kernel"
222 Select this option if you have an IBM z/Architecture machine
223 and want to use the 64 bit addressing mode.
230 prompt "Kernel support for 31 bit emulation"
232 select COMPAT_BINFMT_ELF if BINFMT_ELF
233 select ARCH_WANT_OLD_COMPAT_IPC
235 Select this option if you want to enable your system kernel to
236 handle system-calls from ELF binaries for 31 bit ESA. This option
237 (and some other stuff like libraries and such) is needed for
238 executing 31 bit applications. It is safe to say "Y".
240 config SYSVIPC_COMPAT
241 def_bool y if COMPAT && SYSVIPC
244 def_bool y if COMPAT && KEYS
248 prompt "Symmetric multi-processing support"
250 This enables support for systems with more than one CPU. If you have
251 a system with only one CPU, like most personal computers, say N. If
252 you have a system with more than one CPU, say Y.
254 If you say N here, the kernel will run on single and multiprocessor
255 machines, but will use only one CPU of a multiprocessor machine. If
256 you say Y here, the kernel will run on many, but not all,
257 singleprocessor machines. On a singleprocessor machine, the kernel
258 will run faster if you say N here.
260 See also the SMP-HOWTO available at
261 <http://www.tldp.org/docs.html#howto>.
263 Even if you don't know what to do here, say Y.
266 int "Maximum number of CPUs (2-64)"
269 default "32" if !64BIT
270 default "64" if 64BIT
272 This allows you to specify the maximum number of CPUs which this
273 kernel will support. The maximum supported value is 64 and the
274 minimum value which makes sense is 2.
276 This is purely to save memory - each supported CPU adds
277 approximately sixteen kilobytes to the kernel image.
281 prompt "Support for hot-pluggable CPUs"
285 Say Y here to be able to turn CPUs off and on. CPUs
286 can be controlled through /sys/devices/system/cpu/cpu#.
287 Say N if you want to disable CPU hotplug.
294 prompt "Book scheduler support"
298 Book scheduler support improves the CPU scheduler's decision making
299 when dealing with machines that have several books.
301 source kernel/Kconfig.preempt
305 prompt "IEEE FPU emulation"
308 This option is required for IEEE compliant floating point arithmetic
309 on older ESA/390 machines. Say Y unless you know your machine doesn't
312 source kernel/Kconfig.hz
318 config ARCH_SPARSEMEM_ENABLE
320 select SPARSEMEM_VMEMMAP_ENABLE
321 select SPARSEMEM_VMEMMAP
322 select SPARSEMEM_STATIC if !64BIT
324 config ARCH_SPARSEMEM_DEFAULT
327 config ARCH_SELECT_MEMORY_MODEL
330 config ARCH_ENABLE_MEMORY_HOTPLUG
331 def_bool y if SPARSEMEM
333 config ARCH_ENABLE_MEMORY_HOTREMOVE
336 config FORCE_MAX_ZONEORDER
344 prompt "Pack kernel stack"
346 This option enables the compiler option -mkernel-backchain if it
347 is available. If the option is available the compiler supports
348 the new stack layout which dramatically reduces the minimum stack
349 frame size. With an old compiler a non-leaf function needs a
350 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
351 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
352 and 24 byte on 64 bit.
354 Say Y if you are unsure.
358 prompt "Use 8kb for kernel stack instead of 16kb"
359 depends on PACK_STACK && 64BIT && !LOCKDEP
361 If you say Y here and the compiler supports the -mkernel-backchain
362 option the kernel will use a smaller kernel stack size. The reduced
363 size is 8kb instead of 16kb. This allows to run more threads on a
364 system and reduces the pressure on the memory management for higher
365 order page allocations.
367 Say N if you are unsure.
371 prompt "Detect kernel stack overflow"
373 This option enables the compiler option -mstack-guard and
374 -mstack-size if they are available. If the compiler supports them
375 it will emit additional code to each function prolog to trigger
376 an illegal operation if the kernel stack is about to overflow.
378 Say N if you are unsure.
381 int "Size of the guard area (128-1024)"
383 depends on CHECK_STACK
386 This allows you to specify the size of the guard area at the lower
387 end of the kernel stack. If the kernel stack points into the guard
388 area on function entry an illegal operation is triggered. The size
389 needs to be a power of 2. Please keep in mind that the size of an
390 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
391 The minimum size for the stack guard should be 256 for 31 bit and
394 config WARN_DYNAMIC_STACK
396 prompt "Emit compiler warnings for function with dynamic stack usage"
398 This option enables the compiler option -mwarn-dynamicstack. If the
399 compiler supports this options generates warnings for functions
400 that dynamically allocate stack space using alloca.
402 Say N if you are unsure.
410 prompt "QDIO support"
412 This driver provides the Queued Direct I/O base support for
415 To compile this driver as a module, choose M here: the
416 module will be called qdio.
422 prompt "Support for CHSC subchannels"
424 This driver allows usage of CHSC subchannels. A CHSC subchannel
425 is usually present on LPAR only.
426 The driver creates a device /dev/chsc, which may be used to
427 obtain I/O configuration information about the machine and
428 to issue asynchronous chsc commands (DANGEROUS).
429 You will usually only want to use this interface on a special
430 LPAR designated for system management.
432 To compile this driver as a module, choose M here: the
433 module will be called chsc_sch.
440 prompt "SCM bus driver"
442 Bus driver for Storage Class Memory.
446 prompt "Support for EADM subchannels"
449 This driver allows usage of EADM subchannels. EADM subchannels act
450 as a communication vehicle for SCM increments.
452 To compile this driver as a module, choose M here: the
453 module will be called eadm_sch.
460 bool "kernel crash dumps"
461 depends on 64BIT && SMP
464 Generate crash dump after being started by kexec.
465 Crash dump kernels are loaded in the main kernel with kexec-tools
466 into a specially reserved region and then later executed after
467 a crash by kdump/kexec.
468 For more details see Documentation/kdump/kdump.txt
472 prompt "zfcpdump support"
475 Select this option if you want to build an zfcpdump enabled kernel.
476 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
480 menu "Executable file formats / Emulations"
482 source "fs/Kconfig.binfmt"
486 prompt "Enable seccomp to safely compute untrusted bytecode"
489 This kernel feature is useful for number crunching applications
490 that may need to compute untrusted bytecode during their
491 execution. By using pipes or other transports made available to
492 the process as file descriptors supporting the read/write
493 syscalls, it's possible to isolate those applications in
494 their own address space using seccomp. Once seccomp is
495 enabled via /proc/<pid>/seccomp, it cannot be disabled
496 and the task is only allowed to execute a few safe syscalls
497 defined by each seccomp mode.
503 menu "Power Management"
505 config ARCH_HIBERNATION_POSSIBLE
508 source "kernel/power/Kconfig"
520 source "drivers/Kconfig"
524 source "arch/s390/Kconfig.debug"
526 source "security/Kconfig"
528 source "crypto/Kconfig"
532 menu "Virtualization"
536 prompt "Pseudo page fault support"
538 Select this option, if you want to use PFAULT pseudo page fault
539 handling under VM. If running native or in LPAR, this option
540 has no effect. If your VM does not support PFAULT, PAGEEX
541 pseudo page fault handling will be used.
542 Note that VM 4.2 supports PFAULT but has a bug in its
543 implementation that causes some problems.
544 Everybody who wants to run Linux under VM != VM4.2 should select
548 bool "VM shared kernel support"
549 depends on !JUMP_LABEL
551 Select this option, if you want to share the text segment of the
552 Linux kernel between different VM guests. This reduces memory
553 usage with lots of guests but greatly increases kernel size.
554 Also if a kernel was IPL'ed from a shared segment the kexec system
556 You should only select this option if you know what you are
557 doing and want to exploit this feature.
561 prompt "Cooperative memory management"
563 Select this option, if you want to enable the kernel interface
564 to reduce the memory size of the system. This is accomplished
565 by allocating pages of memory and put them "on hold". This only
566 makes sense for a system running under VM where the unused pages
567 will be reused by VM for other guest systems. The interface
568 allows an external monitor to balance memory of many systems.
569 Everybody who wants to run Linux under VM should select this
574 prompt "IUCV special message interface to cooperative memory management"
575 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
577 Select this option to enable the special message interface to
578 the cooperative memory management.
582 prompt "Linux - VM Monitor Stream, base infrastructure"
585 This provides a kernel interface for creating and updating z/VM APPLDATA
586 monitor records. The monitor records are updated at certain time
587 intervals, once the timer is started.
588 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
589 i.e. enables or disables monitoring on the Linux side.
590 A custom interval value (in seconds) can be written to
591 /proc/appldata/interval.
593 Defaults are 60 seconds interval and timer off.
594 The /proc entries can also be read from, showing the current settings.
598 prompt "Monitor memory management statistics"
599 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
601 This provides memory management related data to the Linux - VM Monitor
602 Stream, like paging/swapping rate, memory utilisation, etc.
603 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
604 APPLDATA monitor record, i.e. enables or disables monitoring this record
608 The /proc entry can also be read from, showing the current settings.
610 This can also be compiled as a module, which will be called
615 prompt "Monitor OS statistics"
616 depends on APPLDATA_BASE
618 This provides OS related data to the Linux - VM Monitor Stream, like
619 CPU utilisation, etc.
620 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
621 APPLDATA monitor record, i.e. enables or disables monitoring this record
625 This can also be compiled as a module, which will be called
628 config APPLDATA_NET_SUM
630 prompt "Monitor overall network statistics"
631 depends on APPLDATA_BASE && NET
633 This provides network related data to the Linux - VM Monitor Stream,
634 currently there is only a total sum of network I/O statistics, no
636 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
637 APPLDATA monitor record, i.e. enables or disables monitoring this record
641 This can also be compiled as a module, which will be called
646 prompt "s390 hypervisor file system support"
647 select SYS_HYPERVISOR
649 This is a virtual file system intended to provide accounting
650 information in an s390 hypervisor environment.
652 source "arch/s390/kvm/Kconfig"
656 prompt "s390 support for virtio devices (EXPERIMENTAL)"
657 depends on 64BIT && EXPERIMENTAL
658 select VIRTUALIZATION
660 select VIRTIO_CONSOLE
662 Enabling this option adds support for virtio based paravirtual device
665 Select this option if you want to run the kernel as a guest under