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_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
145 config SCHED_OMIT_FRAME_POINTER
148 source "init/Kconfig"
150 source "kernel/Kconfig.freezer"
152 menu "Processor type and features"
154 config HAVE_MARCH_Z900_FEATURES
157 config HAVE_MARCH_Z990_FEATURES
159 select HAVE_MARCH_Z900_FEATURES
161 config HAVE_MARCH_Z9_109_FEATURES
163 select HAVE_MARCH_Z990_FEATURES
165 config HAVE_MARCH_Z10_FEATURES
167 select HAVE_MARCH_Z9_109_FEATURES
169 config HAVE_MARCH_Z196_FEATURES
171 select HAVE_MARCH_Z10_FEATURES
174 prompt "Processor type"
178 bool "System/390 model G5 and G6"
181 Select this to build a 31 bit kernel that works
182 on all ESA/390 and z/Architecture machines.
185 bool "IBM zSeries model z800 and z900"
186 select HAVE_MARCH_Z900_FEATURES if 64BIT
188 Select this to enable optimizations for model z800/z900 (2064 and
189 2066 series). This will enable some optimizations that are not
190 available on older ESA/390 (31 Bit) only CPUs.
193 bool "IBM zSeries model z890 and z990"
194 select HAVE_MARCH_Z990_FEATURES if 64BIT
196 Select this to enable optimizations for model z890/z990 (2084 and
197 2086 series). The kernel will be slightly faster but will not work
202 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
204 Select this to enable optimizations for IBM System z9 (2094 and
205 2096 series). The kernel will be slightly faster but will not work
209 bool "IBM System z10"
210 select HAVE_MARCH_Z10_FEATURES if 64BIT
212 Select this to enable optimizations for IBM System z10 (2097 and
213 2098 series). The kernel will be slightly faster but will not work
217 bool "IBM zEnterprise 114 and 196"
218 select HAVE_MARCH_Z196_FEATURES if 64BIT
220 Select this to enable optimizations for IBM zEnterprise 114 and 196
221 (2818 and 2817 series). The kernel will be slightly faster but will
222 not work on older machines.
228 prompt "64 bit kernel"
230 Select this option if you have an IBM z/Architecture machine
231 and want to use the 64 bit addressing mode.
238 prompt "Kernel support for 31 bit emulation"
240 select COMPAT_BINFMT_ELF if BINFMT_ELF
241 select ARCH_WANT_OLD_COMPAT_IPC
243 Select this option if you want to enable your system kernel to
244 handle system-calls from ELF binaries for 31 bit ESA. This option
245 (and some other stuff like libraries and such) is needed for
246 executing 31 bit applications. It is safe to say "Y".
248 config SYSVIPC_COMPAT
249 def_bool y if COMPAT && SYSVIPC
252 def_bool y if COMPAT && KEYS
256 prompt "Symmetric multi-processing support"
258 This enables support for systems with more than one CPU. If you have
259 a system with only one CPU, like most personal computers, say N. If
260 you have a system with more than one CPU, say Y.
262 If you say N here, the kernel will run on single and multiprocessor
263 machines, but will use only one CPU of a multiprocessor machine. If
264 you say Y here, the kernel will run on many, but not all,
265 singleprocessor machines. On a singleprocessor machine, the kernel
266 will run faster if you say N here.
268 See also the SMP-HOWTO available at
269 <http://www.tldp.org/docs.html#howto>.
271 Even if you don't know what to do here, say Y.
274 int "Maximum number of CPUs (2-64)"
277 default "32" if !64BIT
278 default "64" if 64BIT
280 This allows you to specify the maximum number of CPUs which this
281 kernel will support. The maximum supported value is 64 and the
282 minimum value which makes sense is 2.
284 This is purely to save memory - each supported CPU adds
285 approximately sixteen kilobytes to the kernel image.
289 prompt "Support for hot-pluggable CPUs"
293 Say Y here to be able to turn CPUs off and on. CPUs
294 can be controlled through /sys/devices/system/cpu/cpu#.
295 Say N if you want to disable CPU hotplug.
302 prompt "Book scheduler support"
306 Book scheduler support improves the CPU scheduler's decision making
307 when dealing with machines that have several books.
309 source kernel/Kconfig.preempt
313 prompt "IEEE FPU emulation"
316 This option is required for IEEE compliant floating point arithmetic
317 on older ESA/390 machines. Say Y unless you know your machine doesn't
320 source kernel/Kconfig.hz
326 config ARCH_SPARSEMEM_ENABLE
328 select SPARSEMEM_VMEMMAP_ENABLE
329 select SPARSEMEM_VMEMMAP
330 select SPARSEMEM_STATIC if !64BIT
332 config ARCH_SPARSEMEM_DEFAULT
335 config ARCH_SELECT_MEMORY_MODEL
338 config ARCH_ENABLE_MEMORY_HOTPLUG
339 def_bool y if SPARSEMEM
341 config ARCH_ENABLE_MEMORY_HOTREMOVE
344 config FORCE_MAX_ZONEORDER
352 prompt "Pack kernel stack"
354 This option enables the compiler option -mkernel-backchain if it
355 is available. If the option is available the compiler supports
356 the new stack layout which dramatically reduces the minimum stack
357 frame size. With an old compiler a non-leaf function needs a
358 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
359 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
360 and 24 byte on 64 bit.
362 Say Y if you are unsure.
366 prompt "Use 8kb for kernel stack instead of 16kb"
367 depends on PACK_STACK && 64BIT && !LOCKDEP
369 If you say Y here and the compiler supports the -mkernel-backchain
370 option the kernel will use a smaller kernel stack size. The reduced
371 size is 8kb instead of 16kb. This allows to run more threads on a
372 system and reduces the pressure on the memory management for higher
373 order page allocations.
375 Say N 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.
430 prompt "Support for CHSC subchannels"
432 This driver allows usage of CHSC subchannels. A CHSC subchannel
433 is usually present on LPAR only.
434 The driver creates a device /dev/chsc, which may be used to
435 obtain I/O configuration information about the machine and
436 to issue asynchronous chsc commands (DANGEROUS).
437 You will usually only want to use this interface on a special
438 LPAR designated for system management.
440 To compile this driver as a module, choose M here: the
441 module will be called chsc_sch.
448 prompt "SCM bus driver"
450 Bus driver for Storage Class Memory.
454 prompt "Support for EADM subchannels"
457 This driver allows usage of EADM subchannels. EADM subchannels act
458 as a communication vehicle for SCM increments.
460 To compile this driver as a module, choose M here: the
461 module will be called eadm_sch.
468 bool "kernel crash dumps"
469 depends on 64BIT && SMP
472 Generate crash dump after being started by kexec.
473 Crash dump kernels are loaded in the main kernel with kexec-tools
474 into a specially reserved region and then later executed after
475 a crash by kdump/kexec.
476 For more details see Documentation/kdump/kdump.txt
480 prompt "zfcpdump support"
483 Select this option if you want to build an zfcpdump enabled kernel.
484 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
488 menu "Executable file formats / Emulations"
490 source "fs/Kconfig.binfmt"
494 prompt "Enable seccomp to safely compute untrusted bytecode"
497 This kernel feature is useful for number crunching applications
498 that may need to compute untrusted bytecode during their
499 execution. By using pipes or other transports made available to
500 the process as file descriptors supporting the read/write
501 syscalls, it's possible to isolate those applications in
502 their own address space using seccomp. Once seccomp is
503 enabled via /proc/<pid>/seccomp, it cannot be disabled
504 and the task is only allowed to execute a few safe syscalls
505 defined by each seccomp mode.
511 menu "Power Management"
513 config ARCH_HIBERNATION_POSSIBLE
516 source "kernel/power/Kconfig"
528 source "drivers/Kconfig"
532 source "arch/s390/Kconfig.debug"
534 source "security/Kconfig"
536 source "crypto/Kconfig"
540 menu "Virtualization"
544 prompt "Pseudo page fault support"
546 Select this option, if you want to use PFAULT pseudo page fault
547 handling under VM. If running native or in LPAR, this option
548 has no effect. If your VM does not support PFAULT, PAGEEX
549 pseudo page fault handling will be used.
550 Note that VM 4.2 supports PFAULT but has a bug in its
551 implementation that causes some problems.
552 Everybody who wants to run Linux under VM != VM4.2 should select
556 bool "VM shared kernel support"
557 depends on !JUMP_LABEL
559 Select this option, if you want to share the text segment of the
560 Linux kernel between different VM guests. This reduces memory
561 usage with lots of guests but greatly increases kernel size.
562 Also if a kernel was IPL'ed from a shared segment the kexec system
564 You should only select this option if you know what you are
565 doing and want to exploit this feature.
569 prompt "Cooperative memory management"
571 Select this option, if you want to enable the kernel interface
572 to reduce the memory size of the system. This is accomplished
573 by allocating pages of memory and put them "on hold". This only
574 makes sense for a system running under VM where the unused pages
575 will be reused by VM for other guest systems. The interface
576 allows an external monitor to balance memory of many systems.
577 Everybody who wants to run Linux under VM should select this
582 prompt "IUCV special message interface to cooperative memory management"
583 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
585 Select this option to enable the special message interface to
586 the cooperative memory management.
590 prompt "Linux - VM Monitor Stream, base infrastructure"
593 This provides a kernel interface for creating and updating z/VM APPLDATA
594 monitor records. The monitor records are updated at certain time
595 intervals, once the timer is started.
596 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
597 i.e. enables or disables monitoring on the Linux side.
598 A custom interval value (in seconds) can be written to
599 /proc/appldata/interval.
601 Defaults are 60 seconds interval and timer off.
602 The /proc entries can also be read from, showing the current settings.
606 prompt "Monitor memory management statistics"
607 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
609 This provides memory management related data to the Linux - VM Monitor
610 Stream, like paging/swapping rate, memory utilisation, etc.
611 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
612 APPLDATA monitor record, i.e. enables or disables monitoring this record
616 The /proc entry can also be read from, showing the current settings.
618 This can also be compiled as a module, which will be called
623 prompt "Monitor OS statistics"
624 depends on APPLDATA_BASE
626 This provides OS related data to the Linux - VM Monitor Stream, like
627 CPU utilisation, etc.
628 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
629 APPLDATA monitor record, i.e. enables or disables monitoring this record
633 This can also be compiled as a module, which will be called
636 config APPLDATA_NET_SUM
638 prompt "Monitor overall network statistics"
639 depends on APPLDATA_BASE && NET
641 This provides network related data to the Linux - VM Monitor Stream,
642 currently there is only a total sum of network I/O statistics, no
644 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
645 APPLDATA monitor record, i.e. enables or disables monitoring this record
649 This can also be compiled as a module, which will be called
654 prompt "s390 hypervisor file system support"
655 select SYS_HYPERVISOR
657 This is a virtual file system intended to provide accounting
658 information in an s390 hypervisor environment.
660 source "arch/s390/kvm/Kconfig"
664 prompt "s390 support for virtio devices (EXPERIMENTAL)"
665 depends on 64BIT && EXPERIMENTAL
666 select VIRTUALIZATION
668 select VIRTIO_CONSOLE
670 Enabling this option adds support for virtio based paravirtual device
673 Select this option if you want to run the kernel as a guest under