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 ARCH_DISCARD_MEMBLOCK
64 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
65 select ARCH_HAVE_NMI_SAFE_CMPXCHG
66 select ARCH_INLINE_READ_LOCK
67 select ARCH_INLINE_READ_LOCK_BH
68 select ARCH_INLINE_READ_LOCK_IRQ
69 select ARCH_INLINE_READ_LOCK_IRQSAVE
70 select ARCH_INLINE_READ_TRYLOCK
71 select ARCH_INLINE_READ_UNLOCK
72 select ARCH_INLINE_READ_UNLOCK_BH
73 select ARCH_INLINE_READ_UNLOCK_IRQ
74 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
75 select ARCH_INLINE_SPIN_LOCK
76 select ARCH_INLINE_SPIN_LOCK_BH
77 select ARCH_INLINE_SPIN_LOCK_IRQ
78 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
79 select ARCH_INLINE_SPIN_TRYLOCK
80 select ARCH_INLINE_SPIN_TRYLOCK_BH
81 select ARCH_INLINE_SPIN_UNLOCK
82 select ARCH_INLINE_SPIN_UNLOCK_BH
83 select ARCH_INLINE_SPIN_UNLOCK_IRQ
84 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_WRITE_LOCK
86 select ARCH_INLINE_WRITE_LOCK_BH
87 select ARCH_INLINE_WRITE_LOCK_IRQ
88 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
89 select ARCH_INLINE_WRITE_TRYLOCK
90 select ARCH_INLINE_WRITE_UNLOCK
91 select ARCH_INLINE_WRITE_UNLOCK_BH
92 select ARCH_INLINE_WRITE_UNLOCK_IRQ
93 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
94 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
95 select ARCH_WANT_IPC_PARSE_VERSION
96 select BUILDTIME_EXTABLE_SORT
97 select CLONE_BACKWARDS2
98 select GENERIC_CLOCKEVENTS
99 select GENERIC_CPU_DEVICES if !SMP
100 select GENERIC_KERNEL_THREAD
101 select GENERIC_SMP_IDLE_THREAD
102 select GENERIC_TIME_VSYSCALL_OLD
103 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
104 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
105 select HAVE_ARCH_MUTEX_CPU_RELAX
106 select HAVE_ARCH_SECCOMP_FILTER
107 select HAVE_ARCH_TRACEHOOK
108 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
109 select HAVE_BPF_JIT if 64BIT && PACK_STACK
110 select HAVE_CMPXCHG_DOUBLE
111 select HAVE_CMPXCHG_LOCAL
112 select HAVE_C_RECORDMCOUNT
113 select HAVE_DEBUG_KMEMLEAK
114 select HAVE_DYNAMIC_FTRACE
115 select HAVE_FTRACE_MCOUNT_RECORD
116 select HAVE_FUNCTION_GRAPH_TRACER
117 select HAVE_FUNCTION_TRACER
118 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
119 select HAVE_KERNEL_BZIP2
120 select HAVE_KERNEL_GZIP
121 select HAVE_KERNEL_LZMA
122 select HAVE_KERNEL_LZO
123 select HAVE_KERNEL_XZ
125 select HAVE_KRETPROBES
126 select HAVE_KVM if 64BIT
128 select HAVE_MEMBLOCK_NODE_MAP
129 select HAVE_MOD_ARCH_SPECIFIC
131 select HAVE_PERF_EVENTS
132 select HAVE_REGS_AND_STACK_ACCESS_API
133 select HAVE_SYSCALL_TRACEPOINTS
134 select HAVE_SYSCALL_WRAPPERS
135 select HAVE_UID16 if 32BIT
136 select HAVE_VIRT_CPU_ACCOUNTING
137 select INIT_ALL_POSSIBLE
138 select KTIME_SCALAR if 32BIT
139 select MODULES_USE_ELF_RELA
140 select SYSCTL_EXCEPTION_TRACE
141 select USE_GENERIC_SMP_HELPERS if SMP
142 select VIRT_CPU_ACCOUNTING
144 config SCHED_OMIT_FRAME_POINTER
147 source "init/Kconfig"
149 source "kernel/Kconfig.freezer"
151 menu "Processor type and features"
153 config HAVE_MARCH_Z900_FEATURES
156 config HAVE_MARCH_Z990_FEATURES
158 select HAVE_MARCH_Z900_FEATURES
160 config HAVE_MARCH_Z9_109_FEATURES
162 select HAVE_MARCH_Z990_FEATURES
164 config HAVE_MARCH_Z10_FEATURES
166 select HAVE_MARCH_Z9_109_FEATURES
168 config HAVE_MARCH_Z196_FEATURES
170 select HAVE_MARCH_Z10_FEATURES
172 config HAVE_MARCH_ZEC12_FEATURES
174 select HAVE_MARCH_Z196_FEATURES
177 prompt "Processor type"
181 bool "System/390 model G5 and G6"
184 Select this to build a 31 bit kernel that works
185 on all ESA/390 and z/Architecture machines.
188 bool "IBM zSeries model z800 and z900"
189 select HAVE_MARCH_Z900_FEATURES if 64BIT
191 Select this to enable optimizations for model z800/z900 (2064 and
192 2066 series). This will enable some optimizations that are not
193 available on older ESA/390 (31 Bit) only CPUs.
196 bool "IBM zSeries model z890 and z990"
197 select HAVE_MARCH_Z990_FEATURES if 64BIT
199 Select this to enable optimizations for model z890/z990 (2084 and
200 2086 series). The kernel will be slightly faster but will not work
205 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
207 Select this to enable optimizations for IBM System z9 (2094 and
208 2096 series). The kernel will be slightly faster but will not work
212 bool "IBM System z10"
213 select HAVE_MARCH_Z10_FEATURES if 64BIT
215 Select this to enable optimizations for IBM System z10 (2097 and
216 2098 series). The kernel will be slightly faster but will not work
220 bool "IBM zEnterprise 114 and 196"
221 select HAVE_MARCH_Z196_FEATURES if 64BIT
223 Select this to enable optimizations for IBM zEnterprise 114 and 196
224 (2818 and 2817 series). The kernel will be slightly faster but will
225 not work on older machines.
229 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
231 Select this to enable optimizations for IBM zEC12 (2827 series). The
232 kernel will be slightly faster but will not work on older machines.
238 prompt "64 bit kernel"
240 Select this option if you have an IBM z/Architecture machine
241 and want to use the 64 bit addressing mode.
248 prompt "Kernel support for 31 bit emulation"
250 select COMPAT_BINFMT_ELF if BINFMT_ELF
251 select ARCH_WANT_OLD_COMPAT_IPC
253 Select this option if you want to enable your system kernel to
254 handle system-calls from ELF binaries for 31 bit ESA. This option
255 (and some other stuff like libraries and such) is needed for
256 executing 31 bit applications. It is safe to say "Y".
258 config SYSVIPC_COMPAT
259 def_bool y if COMPAT && SYSVIPC
262 def_bool y if COMPAT && KEYS
266 prompt "Symmetric multi-processing support"
268 This enables support for systems with more than one CPU. If you have
269 a system with only one CPU, like most personal computers, say N. If
270 you have a system with more than one CPU, say Y.
272 If you say N here, the kernel will run on single and multiprocessor
273 machines, but will use only one CPU of a multiprocessor machine. If
274 you say Y here, the kernel will run on many, but not all,
275 singleprocessor machines. On a singleprocessor machine, the kernel
276 will run faster if you say N here.
278 See also the SMP-HOWTO available at
279 <http://www.tldp.org/docs.html#howto>.
281 Even if you don't know what to do here, say Y.
284 int "Maximum number of CPUs (2-64)"
287 default "32" if !64BIT
288 default "64" if 64BIT
290 This allows you to specify the maximum number of CPUs which this
291 kernel will support. The maximum supported value is 64 and the
292 minimum value which makes sense is 2.
294 This is purely to save memory - each supported CPU adds
295 approximately sixteen kilobytes to the kernel image.
299 prompt "Support for hot-pluggable CPUs"
303 Say Y here to be able to turn CPUs off and on. CPUs
304 can be controlled through /sys/devices/system/cpu/cpu#.
305 Say N if you want to disable CPU hotplug.
312 prompt "Book scheduler support"
316 Book scheduler support improves the CPU scheduler's decision making
317 when dealing with machines that have several books.
319 source kernel/Kconfig.preempt
323 prompt "IEEE FPU emulation"
326 This option is required for IEEE compliant floating point arithmetic
327 on older ESA/390 machines. Say Y unless you know your machine doesn't
330 source kernel/Kconfig.hz
336 config ARCH_SPARSEMEM_ENABLE
338 select SPARSEMEM_VMEMMAP_ENABLE
339 select SPARSEMEM_VMEMMAP
340 select SPARSEMEM_STATIC if !64BIT
342 config ARCH_SPARSEMEM_DEFAULT
345 config ARCH_SELECT_MEMORY_MODEL
348 config ARCH_ENABLE_MEMORY_HOTPLUG
349 def_bool y if SPARSEMEM
351 config ARCH_ENABLE_MEMORY_HOTREMOVE
354 config FORCE_MAX_ZONEORDER
362 prompt "Pack kernel stack"
364 This option enables the compiler option -mkernel-backchain if it
365 is available. If the option is available the compiler supports
366 the new stack layout which dramatically reduces the minimum stack
367 frame size. With an old compiler a non-leaf function needs a
368 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
369 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
370 and 24 byte on 64 bit.
372 Say Y if you are unsure.
376 prompt "Use 8kb for kernel stack instead of 16kb"
377 depends on PACK_STACK && 64BIT && !LOCKDEP
379 If you say Y here and the compiler supports the -mkernel-backchain
380 option the kernel will use a smaller kernel stack size. The reduced
381 size is 8kb instead of 16kb. This allows to run more threads on a
382 system and reduces the pressure on the memory management for higher
383 order page allocations.
385 Say N if you are unsure.
389 prompt "Detect kernel stack overflow"
391 This option enables the compiler option -mstack-guard and
392 -mstack-size if they are available. If the compiler supports them
393 it will emit additional code to each function prolog to trigger
394 an illegal operation if the kernel stack is about to overflow.
396 Say N if you are unsure.
399 int "Size of the guard area (128-1024)"
401 depends on CHECK_STACK
404 This allows you to specify the size of the guard area at the lower
405 end of the kernel stack. If the kernel stack points into the guard
406 area on function entry an illegal operation is triggered. The size
407 needs to be a power of 2. Please keep in mind that the size of an
408 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
409 The minimum size for the stack guard should be 256 for 31 bit and
412 config WARN_DYNAMIC_STACK
414 prompt "Emit compiler warnings for function with dynamic stack usage"
416 This option enables the compiler option -mwarn-dynamicstack. If the
417 compiler supports this options generates warnings for functions
418 that dynamically allocate stack space using alloca.
420 Say N if you are unsure.
428 prompt "QDIO support"
430 This driver provides the Queued Direct I/O base support for
433 To compile this driver as a module, choose M here: the
434 module will be called qdio.
442 select ARCH_SUPPORTS_MSI
449 config PCI_NR_FUNCTIONS
450 int "Maximum number of PCI functions (1-4096)"
454 This allows you to specify the maximum number of PCI functions which
455 this kernel will support.
457 source "drivers/pci/Kconfig"
458 source "drivers/pci/pcie/Kconfig"
459 source "drivers/pci/hotplug/Kconfig"
474 select HAVE_DMA_API_DEBUG
476 config NEED_SG_DMA_LENGTH
479 config HAVE_DMA_ATTRS
482 config NEED_DMA_MAP_STATE
487 prompt "Support for CHSC subchannels"
489 This driver allows usage of CHSC subchannels. A CHSC subchannel
490 is usually present on LPAR only.
491 The driver creates a device /dev/chsc, which may be used to
492 obtain I/O configuration information about the machine and
493 to issue asynchronous chsc commands (DANGEROUS).
494 You will usually only want to use this interface on a special
495 LPAR designated for system management.
497 To compile this driver as a module, choose M here: the
498 module will be called chsc_sch.
505 prompt "SCM bus driver"
507 Bus driver for Storage Class Memory.
511 prompt "Support for EADM subchannels"
514 This driver allows usage of EADM subchannels. EADM subchannels act
515 as a communication vehicle for SCM increments.
517 To compile this driver as a module, choose M here: the
518 module will be called eadm_sch.
525 bool "kernel crash dumps"
526 depends on 64BIT && SMP
529 Generate crash dump after being started by kexec.
530 Crash dump kernels are loaded in the main kernel with kexec-tools
531 into a specially reserved region and then later executed after
532 a crash by kdump/kexec.
533 For more details see Documentation/kdump/kdump.txt
537 prompt "zfcpdump support"
540 Select this option if you want to build an zfcpdump enabled kernel.
541 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
545 menu "Executable file formats / Emulations"
547 source "fs/Kconfig.binfmt"
551 prompt "Enable seccomp to safely compute untrusted bytecode"
554 This kernel feature is useful for number crunching applications
555 that may need to compute untrusted bytecode during their
556 execution. By using pipes or other transports made available to
557 the process as file descriptors supporting the read/write
558 syscalls, it's possible to isolate those applications in
559 their own address space using seccomp. Once seccomp is
560 enabled via /proc/<pid>/seccomp, it cannot be disabled
561 and the task is only allowed to execute a few safe syscalls
562 defined by each seccomp mode.
568 menu "Power Management"
570 config ARCH_HIBERNATION_POSSIBLE
573 source "kernel/power/Kconfig"
585 source "drivers/Kconfig"
589 source "arch/s390/Kconfig.debug"
591 source "security/Kconfig"
593 source "crypto/Kconfig"
597 menu "Virtualization"
601 prompt "Pseudo page fault support"
603 Select this option, if you want to use PFAULT pseudo page fault
604 handling under VM. If running native or in LPAR, this option
605 has no effect. If your VM does not support PFAULT, PAGEEX
606 pseudo page fault handling will be used.
607 Note that VM 4.2 supports PFAULT but has a bug in its
608 implementation that causes some problems.
609 Everybody who wants to run Linux under VM != VM4.2 should select
613 bool "VM shared kernel support"
614 depends on !JUMP_LABEL
616 Select this option, if you want to share the text segment of the
617 Linux kernel between different VM guests. This reduces memory
618 usage with lots of guests but greatly increases kernel size.
619 Also if a kernel was IPL'ed from a shared segment the kexec system
621 You should only select this option if you know what you are
622 doing and want to exploit this feature.
626 prompt "Cooperative memory management"
628 Select this option, if you want to enable the kernel interface
629 to reduce the memory size of the system. This is accomplished
630 by allocating pages of memory and put them "on hold". This only
631 makes sense for a system running under VM where the unused pages
632 will be reused by VM for other guest systems. The interface
633 allows an external monitor to balance memory of many systems.
634 Everybody who wants to run Linux under VM should select this
639 prompt "IUCV special message interface to cooperative memory management"
640 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
642 Select this option to enable the special message interface to
643 the cooperative memory management.
647 prompt "Linux - VM Monitor Stream, base infrastructure"
650 This provides a kernel interface for creating and updating z/VM APPLDATA
651 monitor records. The monitor records are updated at certain time
652 intervals, once the timer is started.
653 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
654 i.e. enables or disables monitoring on the Linux side.
655 A custom interval value (in seconds) can be written to
656 /proc/appldata/interval.
658 Defaults are 60 seconds interval and timer off.
659 The /proc entries can also be read from, showing the current settings.
663 prompt "Monitor memory management statistics"
664 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
666 This provides memory management related data to the Linux - VM Monitor
667 Stream, like paging/swapping rate, memory utilisation, etc.
668 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
669 APPLDATA monitor record, i.e. enables or disables monitoring this record
673 The /proc entry can also be read from, showing the current settings.
675 This can also be compiled as a module, which will be called
680 prompt "Monitor OS statistics"
681 depends on APPLDATA_BASE
683 This provides OS related data to the Linux - VM Monitor Stream, like
684 CPU utilisation, etc.
685 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
686 APPLDATA monitor record, i.e. enables or disables monitoring this record
690 This can also be compiled as a module, which will be called
693 config APPLDATA_NET_SUM
695 prompt "Monitor overall network statistics"
696 depends on APPLDATA_BASE && NET
698 This provides network related data to the Linux - VM Monitor Stream,
699 currently there is only a total sum of network I/O statistics, no
701 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
702 APPLDATA monitor record, i.e. enables or disables monitoring this record
706 This can also be compiled as a module, which will be called
711 prompt "s390 hypervisor file system support"
712 select SYS_HYPERVISOR
714 This is a virtual file system intended to provide accounting
715 information in an s390 hypervisor environment.
717 source "arch/s390/kvm/Kconfig"
721 prompt "s390 support for virtio devices"
723 select VIRTUALIZATION
725 select VIRTIO_CONSOLE
727 Enabling this option adds support for virtio based paravirtual device
730 Select this option if you want to run the kernel as a guest under