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
135 select GENERIC_CLOCKEVENTS
136 select KTIME_SCALAR if 32BIT
137 select HAVE_ARCH_SECCOMP_FILTER
139 config SCHED_OMIT_FRAME_POINTER
142 source "init/Kconfig"
144 source "kernel/Kconfig.freezer"
146 menu "Processor type and features"
148 config HAVE_MARCH_Z900_FEATURES
151 config HAVE_MARCH_Z990_FEATURES
153 select HAVE_MARCH_Z900_FEATURES
155 config HAVE_MARCH_Z9_109_FEATURES
157 select HAVE_MARCH_Z990_FEATURES
159 config HAVE_MARCH_Z10_FEATURES
161 select HAVE_MARCH_Z9_109_FEATURES
163 config HAVE_MARCH_Z196_FEATURES
165 select HAVE_MARCH_Z10_FEATURES
168 prompt "Processor type"
172 bool "System/390 model G5 and G6"
175 Select this to build a 31 bit kernel that works
176 on all ESA/390 and z/Architecture machines.
179 bool "IBM zSeries model z800 and z900"
180 select HAVE_MARCH_Z900_FEATURES if 64BIT
182 Select this to enable optimizations for model z800/z900 (2064 and
183 2066 series). This will enable some optimizations that are not
184 available on older ESA/390 (31 Bit) only CPUs.
187 bool "IBM zSeries model z890 and z990"
188 select HAVE_MARCH_Z990_FEATURES if 64BIT
190 Select this to enable optimizations for model z890/z990 (2084 and
191 2086 series). The kernel will be slightly faster but will not work
196 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
198 Select this to enable optimizations for IBM System z9 (2094 and
199 2096 series). The kernel will be slightly faster but will not work
203 bool "IBM System z10"
204 select HAVE_MARCH_Z10_FEATURES if 64BIT
206 Select this to enable optimizations for IBM System z10 (2097 and
207 2098 series). The kernel will be slightly faster but will not work
211 bool "IBM zEnterprise 114 and 196"
212 select HAVE_MARCH_Z196_FEATURES if 64BIT
214 Select this to enable optimizations for IBM zEnterprise 114 and 196
215 (2818 and 2817 series). The kernel will be slightly faster but will
216 not work on older machines.
222 prompt "64 bit kernel"
224 Select this option if you have an IBM z/Architecture machine
225 and want to use the 64 bit addressing mode.
232 prompt "Kernel support for 31 bit emulation"
234 select COMPAT_BINFMT_ELF if BINFMT_ELF
235 select ARCH_WANT_OLD_COMPAT_IPC
237 Select this option if you want to enable your system kernel to
238 handle system-calls from ELF binaries for 31 bit ESA. This option
239 (and some other stuff like libraries and such) is needed for
240 executing 31 bit applications. It is safe to say "Y".
242 config SYSVIPC_COMPAT
243 def_bool y if COMPAT && SYSVIPC
246 def_bool y if COMPAT && KEYS
250 prompt "Symmetric multi-processing support"
252 This enables support for systems with more than one CPU. If you have
253 a system with only one CPU, like most personal computers, say N. If
254 you have a system with more than one CPU, say Y.
256 If you say N here, the kernel will run on single and multiprocessor
257 machines, but will use only one CPU of a multiprocessor machine. If
258 you say Y here, the kernel will run on many, but not all,
259 singleprocessor machines. On a singleprocessor machine, the kernel
260 will run faster if you say N here.
262 See also the SMP-HOWTO available at
263 <http://www.tldp.org/docs.html#howto>.
265 Even if you don't know what to do here, say Y.
268 int "Maximum number of CPUs (2-64)"
271 default "32" if !64BIT
272 default "64" if 64BIT
274 This allows you to specify the maximum number of CPUs which this
275 kernel will support. The maximum supported value is 64 and the
276 minimum value which makes sense is 2.
278 This is purely to save memory - each supported CPU adds
279 approximately sixteen kilobytes to the kernel image.
283 prompt "Support for hot-pluggable CPUs"
287 Say Y here to be able to turn CPUs off and on. CPUs
288 can be controlled through /sys/devices/system/cpu/cpu#.
289 Say N if you want to disable CPU hotplug.
296 prompt "Book scheduler support"
300 Book scheduler support improves the CPU scheduler's decision making
301 when dealing with machines that have several books.
303 source kernel/Kconfig.preempt
307 prompt "IEEE FPU emulation"
310 This option is required for IEEE compliant floating point arithmetic
311 on older ESA/390 machines. Say Y unless you know your machine doesn't
314 source kernel/Kconfig.hz
320 config ARCH_SPARSEMEM_ENABLE
322 select SPARSEMEM_VMEMMAP_ENABLE
323 select SPARSEMEM_VMEMMAP
324 select SPARSEMEM_STATIC if !64BIT
326 config ARCH_SPARSEMEM_DEFAULT
329 config ARCH_SELECT_MEMORY_MODEL
332 config ARCH_ENABLE_MEMORY_HOTPLUG
333 def_bool y if SPARSEMEM
335 config ARCH_ENABLE_MEMORY_HOTREMOVE
338 config FORCE_MAX_ZONEORDER
346 prompt "Pack kernel stack"
348 This option enables the compiler option -mkernel-backchain if it
349 is available. If the option is available the compiler supports
350 the new stack layout which dramatically reduces the minimum stack
351 frame size. With an old compiler a non-leaf function needs a
352 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
353 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
354 and 24 byte on 64 bit.
356 Say Y if you are unsure.
360 prompt "Use 8kb for kernel stack instead of 16kb"
361 depends on PACK_STACK && 64BIT && !LOCKDEP
363 If you say Y here and the compiler supports the -mkernel-backchain
364 option the kernel will use a smaller kernel stack size. The reduced
365 size is 8kb instead of 16kb. This allows to run more threads on a
366 system and reduces the pressure on the memory management for higher
367 order page allocations.
369 Say N if you are unsure.
373 prompt "Detect kernel stack overflow"
375 This option enables the compiler option -mstack-guard and
376 -mstack-size if they are available. If the compiler supports them
377 it will emit additional code to each function prolog to trigger
378 an illegal operation if the kernel stack is about to overflow.
380 Say N if you are unsure.
383 int "Size of the guard area (128-1024)"
385 depends on CHECK_STACK
388 This allows you to specify the size of the guard area at the lower
389 end of the kernel stack. If the kernel stack points into the guard
390 area on function entry an illegal operation is triggered. The size
391 needs to be a power of 2. Please keep in mind that the size of an
392 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
393 The minimum size for the stack guard should be 256 for 31 bit and
396 config WARN_DYNAMIC_STACK
398 prompt "Emit compiler warnings for function with dynamic stack usage"
400 This option enables the compiler option -mwarn-dynamicstack. If the
401 compiler supports this options generates warnings for functions
402 that dynamically allocate stack space using alloca.
404 Say N if you are unsure.
412 prompt "QDIO support"
414 This driver provides the Queued Direct I/O base support for
417 To compile this driver as a module, choose M here: the
418 module will be called qdio.
424 prompt "Support for CHSC subchannels"
426 This driver allows usage of CHSC subchannels. A CHSC subchannel
427 is usually present on LPAR only.
428 The driver creates a device /dev/chsc, which may be used to
429 obtain I/O configuration information about the machine and
430 to issue asynchronous chsc commands (DANGEROUS).
431 You will usually only want to use this interface on a special
432 LPAR designated for system management.
434 To compile this driver as a module, choose M here: the
435 module will be called chsc_sch.
442 prompt "SCM bus driver"
444 Bus driver for Storage Class Memory.
448 prompt "Support for EADM subchannels"
451 This driver allows usage of EADM subchannels. EADM subchannels act
452 as a communication vehicle for SCM increments.
454 To compile this driver as a module, choose M here: the
455 module will be called eadm_sch.
462 bool "kernel crash dumps"
463 depends on 64BIT && SMP
466 Generate crash dump after being started by kexec.
467 Crash dump kernels are loaded in the main kernel with kexec-tools
468 into a specially reserved region and then later executed after
469 a crash by kdump/kexec.
470 For more details see Documentation/kdump/kdump.txt
474 prompt "zfcpdump support"
477 Select this option if you want to build an zfcpdump enabled kernel.
478 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
482 menu "Executable file formats / Emulations"
484 source "fs/Kconfig.binfmt"
488 prompt "Enable seccomp to safely compute untrusted bytecode"
491 This kernel feature is useful for number crunching applications
492 that may need to compute untrusted bytecode during their
493 execution. By using pipes or other transports made available to
494 the process as file descriptors supporting the read/write
495 syscalls, it's possible to isolate those applications in
496 their own address space using seccomp. Once seccomp is
497 enabled via /proc/<pid>/seccomp, it cannot be disabled
498 and the task is only allowed to execute a few safe syscalls
499 defined by each seccomp mode.
505 menu "Power Management"
507 config ARCH_HIBERNATION_POSSIBLE
510 source "kernel/power/Kconfig"
522 source "drivers/Kconfig"
526 source "arch/s390/Kconfig.debug"
528 source "security/Kconfig"
530 source "crypto/Kconfig"
534 menu "Virtualization"
538 prompt "Pseudo page fault support"
540 Select this option, if you want to use PFAULT pseudo page fault
541 handling under VM. If running native or in LPAR, this option
542 has no effect. If your VM does not support PFAULT, PAGEEX
543 pseudo page fault handling will be used.
544 Note that VM 4.2 supports PFAULT but has a bug in its
545 implementation that causes some problems.
546 Everybody who wants to run Linux under VM != VM4.2 should select
550 bool "VM shared kernel support"
551 depends on !JUMP_LABEL
553 Select this option, if you want to share the text segment of the
554 Linux kernel between different VM guests. This reduces memory
555 usage with lots of guests but greatly increases kernel size.
556 Also if a kernel was IPL'ed from a shared segment the kexec system
558 You should only select this option if you know what you are
559 doing and want to exploit this feature.
563 prompt "Cooperative memory management"
565 Select this option, if you want to enable the kernel interface
566 to reduce the memory size of the system. This is accomplished
567 by allocating pages of memory and put them "on hold". This only
568 makes sense for a system running under VM where the unused pages
569 will be reused by VM for other guest systems. The interface
570 allows an external monitor to balance memory of many systems.
571 Everybody who wants to run Linux under VM should select this
576 prompt "IUCV special message interface to cooperative memory management"
577 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
579 Select this option to enable the special message interface to
580 the cooperative memory management.
584 prompt "Linux - VM Monitor Stream, base infrastructure"
587 This provides a kernel interface for creating and updating z/VM APPLDATA
588 monitor records. The monitor records are updated at certain time
589 intervals, once the timer is started.
590 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
591 i.e. enables or disables monitoring on the Linux side.
592 A custom interval value (in seconds) can be written to
593 /proc/appldata/interval.
595 Defaults are 60 seconds interval and timer off.
596 The /proc entries can also be read from, showing the current settings.
600 prompt "Monitor memory management statistics"
601 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
603 This provides memory management related data to the Linux - VM Monitor
604 Stream, like paging/swapping rate, memory utilisation, etc.
605 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
606 APPLDATA monitor record, i.e. enables or disables monitoring this record
610 The /proc entry can also be read from, showing the current settings.
612 This can also be compiled as a module, which will be called
617 prompt "Monitor OS statistics"
618 depends on APPLDATA_BASE
620 This provides OS related data to the Linux - VM Monitor Stream, like
621 CPU utilisation, etc.
622 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
623 APPLDATA monitor record, i.e. enables or disables monitoring this record
627 This can also be compiled as a module, which will be called
630 config APPLDATA_NET_SUM
632 prompt "Monitor overall network statistics"
633 depends on APPLDATA_BASE && NET
635 This provides network related data to the Linux - VM Monitor Stream,
636 currently there is only a total sum of network I/O statistics, no
638 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
639 APPLDATA monitor record, i.e. enables or disables monitoring this record
643 This can also be compiled as a module, which will be called
648 prompt "s390 hypervisor file system support"
649 select SYS_HYPERVISOR
651 This is a virtual file system intended to provide accounting
652 information in an s390 hypervisor environment.
654 source "arch/s390/kvm/Kconfig"
658 prompt "s390 support for virtio devices (EXPERIMENTAL)"
659 depends on 64BIT && EXPERIMENTAL
660 select VIRTUALIZATION
662 select VIRTIO_CONSOLE
664 Enabling this option adds support for virtio based paravirtual device
667 Select this option if you want to run the kernel as a guest under