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_HAS_DEBUG_STRICT_USER_COPY_CHECKS
66 select ARCH_HAVE_NMI_SAFE_CMPXCHG
67 select ARCH_INLINE_READ_LOCK
68 select ARCH_INLINE_READ_LOCK_BH
69 select ARCH_INLINE_READ_LOCK_IRQ
70 select ARCH_INLINE_READ_LOCK_IRQSAVE
71 select ARCH_INLINE_READ_TRYLOCK
72 select ARCH_INLINE_READ_UNLOCK
73 select ARCH_INLINE_READ_UNLOCK_BH
74 select ARCH_INLINE_READ_UNLOCK_IRQ
75 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
76 select ARCH_INLINE_SPIN_LOCK
77 select ARCH_INLINE_SPIN_LOCK_BH
78 select ARCH_INLINE_SPIN_LOCK_IRQ
79 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
80 select ARCH_INLINE_SPIN_TRYLOCK
81 select ARCH_INLINE_SPIN_TRYLOCK_BH
82 select ARCH_INLINE_SPIN_UNLOCK
83 select ARCH_INLINE_SPIN_UNLOCK_BH
84 select ARCH_INLINE_SPIN_UNLOCK_IRQ
85 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_WRITE_LOCK
87 select ARCH_INLINE_WRITE_LOCK_BH
88 select ARCH_INLINE_WRITE_LOCK_IRQ
89 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
90 select ARCH_INLINE_WRITE_TRYLOCK
91 select ARCH_INLINE_WRITE_UNLOCK
92 select ARCH_INLINE_WRITE_UNLOCK_BH
93 select ARCH_INLINE_WRITE_UNLOCK_IRQ
94 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
95 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
96 select ARCH_SUPPORTS_ATOMIC_RMW
97 select ARCH_USE_CMPXCHG_LOCKREF
98 select ARCH_WANT_IPC_PARSE_VERSION
99 select BUILDTIME_EXTABLE_SORT
100 select CLONE_BACKWARDS2
101 select GENERIC_CLOCKEVENTS
102 select GENERIC_CPU_DEVICES if !SMP
103 select GENERIC_SMP_IDLE_THREAD
104 select GENERIC_TIME_VSYSCALL
105 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
106 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
107 select HAVE_ARCH_SECCOMP_FILTER
108 select HAVE_ARCH_TRACEHOOK
109 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
110 select HAVE_BPF_JIT if 64BIT && PACK_STACK
111 select HAVE_CMPXCHG_DOUBLE
112 select HAVE_CMPXCHG_LOCAL
113 select HAVE_C_RECORDMCOUNT
114 select HAVE_DEBUG_KMEMLEAK
115 select HAVE_DYNAMIC_FTRACE
116 select HAVE_FTRACE_MCOUNT_RECORD
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FUNCTION_TRACER
119 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
120 select HAVE_FUTEX_CMPXCHG if FUTEX
121 select HAVE_KERNEL_BZIP2
122 select HAVE_KERNEL_GZIP
123 select HAVE_KERNEL_LZ4
124 select HAVE_KERNEL_LZMA
125 select HAVE_KERNEL_LZO
126 select HAVE_KERNEL_XZ
128 select HAVE_KRETPROBES
129 select HAVE_KVM if 64BIT
131 select HAVE_MEMBLOCK_NODE_MAP
132 select HAVE_MOD_ARCH_SPECIFIC
134 select HAVE_PERF_EVENTS
135 select HAVE_REGS_AND_STACK_ACCESS_API
136 select HAVE_SYSCALL_TRACEPOINTS
137 select HAVE_UID16 if 32BIT
138 select HAVE_VIRT_CPU_ACCOUNTING
139 select INIT_ALL_POSSIBLE
140 select KTIME_SCALAR if 32BIT
141 select MODULES_USE_ELF_RELA
143 select OLD_SIGSUSPEND3
144 select SYSCTL_EXCEPTION_TRACE
145 select USE_GENERIC_SMP_HELPERS if SMP
146 select VIRT_CPU_ACCOUNTING
149 config SCHED_OMIT_FRAME_POINTER
152 source "init/Kconfig"
154 source "kernel/Kconfig.freezer"
156 menu "Processor type and features"
158 config HAVE_MARCH_Z900_FEATURES
161 config HAVE_MARCH_Z990_FEATURES
163 select HAVE_MARCH_Z900_FEATURES
165 config HAVE_MARCH_Z9_109_FEATURES
167 select HAVE_MARCH_Z990_FEATURES
169 config HAVE_MARCH_Z10_FEATURES
171 select HAVE_MARCH_Z9_109_FEATURES
173 config HAVE_MARCH_Z196_FEATURES
175 select HAVE_MARCH_Z10_FEATURES
177 config HAVE_MARCH_ZEC12_FEATURES
179 select HAVE_MARCH_Z196_FEATURES
182 prompt "Processor type"
186 bool "System/390 model G5 and G6"
189 Select this to build a 31 bit kernel that works
190 on all ESA/390 and z/Architecture machines.
193 bool "IBM zSeries model z800 and z900"
194 select HAVE_MARCH_Z900_FEATURES if 64BIT
196 Select this to enable optimizations for model z800/z900 (2064 and
197 2066 series). This will enable some optimizations that are not
198 available on older ESA/390 (31 Bit) only CPUs.
201 bool "IBM zSeries model z890 and z990"
202 select HAVE_MARCH_Z990_FEATURES if 64BIT
204 Select this to enable optimizations for model z890/z990 (2084 and
205 2086 series). The kernel will be slightly faster but will not work
210 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
212 Select this to enable optimizations for IBM System z9 (2094 and
213 2096 series). The kernel will be slightly faster but will not work
217 bool "IBM System z10"
218 select HAVE_MARCH_Z10_FEATURES if 64BIT
220 Select this to enable optimizations for IBM System z10 (2097 and
221 2098 series). The kernel will be slightly faster but will not work
225 bool "IBM zEnterprise 114 and 196"
226 select HAVE_MARCH_Z196_FEATURES if 64BIT
228 Select this to enable optimizations for IBM zEnterprise 114 and 196
229 (2818 and 2817 series). The kernel will be slightly faster but will
230 not work on older machines.
233 bool "IBM zBC12 and zEC12"
234 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
236 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
237 2827 series). The kernel will be slightly faster but will not work on
244 prompt "64 bit kernel"
246 Select this option if you have an IBM z/Architecture machine
247 and want to use the 64 bit addressing mode.
254 prompt "Kernel support for 31 bit emulation"
256 select COMPAT_BINFMT_ELF if BINFMT_ELF
257 select ARCH_WANT_OLD_COMPAT_IPC
258 select COMPAT_OLD_SIGACTION
260 Select this option if you want to enable your system kernel to
261 handle system-calls from ELF binaries for 31 bit ESA. This option
262 (and some other stuff like libraries and such) is needed for
263 executing 31 bit applications. It is safe to say "Y".
265 config SYSVIPC_COMPAT
266 def_bool y if COMPAT && SYSVIPC
269 def_bool y if COMPAT && KEYS
273 prompt "Symmetric multi-processing support"
275 This enables support for systems with more than one CPU. If you have
276 a system with only one CPU, like most personal computers, say N. If
277 you have a system with more than one CPU, say Y.
279 If you say N here, the kernel will run on single and multiprocessor
280 machines, but will use only one CPU of a multiprocessor machine. If
281 you say Y here, the kernel will run on many, but not all,
282 singleprocessor machines. On a singleprocessor machine, the kernel
283 will run faster if you say N here.
285 See also the SMP-HOWTO available at
286 <http://www.tldp.org/docs.html#howto>.
288 Even if you don't know what to do here, say Y.
291 int "Maximum number of CPUs (2-64)"
294 default "32" if !64BIT
295 default "64" if 64BIT
297 This allows you to specify the maximum number of CPUs which this
298 kernel will support. The maximum supported value is 64 and the
299 minimum value which makes sense is 2.
301 This is purely to save memory - each supported CPU adds
302 approximately sixteen kilobytes to the kernel image.
306 prompt "Support for hot-pluggable CPUs"
309 Say Y here to be able to turn CPUs off and on. CPUs
310 can be controlled through /sys/devices/system/cpu/cpu#.
311 Say N if you want to disable CPU hotplug.
318 prompt "Book scheduler support"
322 Book scheduler support improves the CPU scheduler's decision making
323 when dealing with machines that have several books.
325 source kernel/Kconfig.preempt
329 prompt "IEEE FPU emulation"
332 This option is required for IEEE compliant floating point arithmetic
333 on older ESA/390 machines. Say Y unless you know your machine doesn't
336 source kernel/Kconfig.hz
342 config ARCH_SPARSEMEM_ENABLE
344 select SPARSEMEM_VMEMMAP_ENABLE
345 select SPARSEMEM_VMEMMAP
346 select SPARSEMEM_STATIC if !64BIT
348 config ARCH_SPARSEMEM_DEFAULT
351 config ARCH_SELECT_MEMORY_MODEL
354 config ARCH_ENABLE_MEMORY_HOTPLUG
355 def_bool y if SPARSEMEM
357 config ARCH_ENABLE_MEMORY_HOTREMOVE
360 config FORCE_MAX_ZONEORDER
368 prompt "Pack kernel stack"
370 This option enables the compiler option -mkernel-backchain if it
371 is available. If the option is available the compiler supports
372 the new stack layout which dramatically reduces the minimum stack
373 frame size. With an old compiler a non-leaf function needs a
374 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
375 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
376 and 24 byte on 64 bit.
378 Say Y if you are unsure.
382 prompt "Detect kernel stack overflow"
384 This option enables the compiler option -mstack-guard and
385 -mstack-size if they are available. If the compiler supports them
386 it will emit additional code to each function prolog to trigger
387 an illegal operation if the kernel stack is about to overflow.
389 Say N if you are unsure.
392 int "Size of the guard area (128-1024)"
394 depends on CHECK_STACK
397 This allows you to specify the size of the guard area at the lower
398 end of the kernel stack. If the kernel stack points into the guard
399 area on function entry an illegal operation is triggered. The size
400 needs to be a power of 2. Please keep in mind that the size of an
401 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
402 The minimum size for the stack guard should be 256 for 31 bit and
405 config WARN_DYNAMIC_STACK
407 prompt "Emit compiler warnings for function with dynamic stack usage"
409 This option enables the compiler option -mwarn-dynamicstack. If the
410 compiler supports this options generates warnings for functions
411 that dynamically allocate stack space using alloca.
413 Say N if you are unsure.
421 prompt "QDIO support"
423 This driver provides the Queued Direct I/O base support for
426 To compile this driver as a module, choose M here: the
427 module will be called qdio.
441 config PCI_NR_FUNCTIONS
442 int "Maximum number of PCI functions (1-4096)"
446 This allows you to specify the maximum number of PCI functions which
447 this kernel will support.
450 int "Maximum number of MSI interrupts (64-32768)"
454 This defines the number of virtual interrupts the kernel will
455 provide for MSI interrupts. If you configure your system to have
456 too few drivers will fail to allocate MSI interrupts for all
459 source "drivers/pci/Kconfig"
460 source "drivers/pci/pcie/Kconfig"
461 source "drivers/pci/hotplug/Kconfig"
476 select HAVE_DMA_API_DEBUG
478 config NEED_SG_DMA_LENGTH
481 config HAVE_DMA_ATTRS
484 config NEED_DMA_MAP_STATE
489 prompt "Support for CHSC subchannels"
491 This driver allows usage of CHSC subchannels. A CHSC subchannel
492 is usually present on LPAR only.
493 The driver creates a device /dev/chsc, which may be used to
494 obtain I/O configuration information about the machine and
495 to issue asynchronous chsc commands (DANGEROUS).
496 You will usually only want to use this interface on a special
497 LPAR designated for system management.
499 To compile this driver as a module, choose M here: the
500 module will be called chsc_sch.
507 prompt "SCM bus driver"
509 Bus driver for Storage Class Memory.
513 prompt "Support for EADM subchannels"
516 This driver allows usage of EADM subchannels. EADM subchannels act
517 as a communication vehicle for SCM increments.
519 To compile this driver as a module, choose M here: the
520 module will be called eadm_sch.
527 bool "kernel crash dumps"
528 depends on 64BIT && SMP
532 Generate crash dump after being started by kexec.
533 Crash dump kernels are loaded in the main kernel with kexec-tools
534 into a specially reserved region and then later executed after
535 a crash by kdump/kexec.
536 For more details see Documentation/kdump/kdump.txt
540 prompt "zfcpdump support"
543 Select this option if you want to build an zfcpdump enabled kernel.
544 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
548 menu "Executable file formats / Emulations"
550 source "fs/Kconfig.binfmt"
554 prompt "Enable seccomp to safely compute untrusted bytecode"
557 This kernel feature is useful for number crunching applications
558 that may need to compute untrusted bytecode during their
559 execution. By using pipes or other transports made available to
560 the process as file descriptors supporting the read/write
561 syscalls, it's possible to isolate those applications in
562 their own address space using seccomp. Once seccomp is
563 enabled via /proc/<pid>/seccomp, it cannot be disabled
564 and the task is only allowed to execute a few safe syscalls
565 defined by each seccomp mode.
571 menu "Power Management"
573 config ARCH_HIBERNATION_POSSIBLE
576 source "kernel/power/Kconfig"
588 source "drivers/Kconfig"
592 source "arch/s390/Kconfig.debug"
594 source "security/Kconfig"
596 source "crypto/Kconfig"
600 menu "Virtualization"
604 prompt "Pseudo page fault support"
606 Select this option, if you want to use PFAULT pseudo page fault
607 handling under VM. If running native or in LPAR, this option
608 has no effect. If your VM does not support PFAULT, PAGEEX
609 pseudo page fault handling will be used.
610 Note that VM 4.2 supports PFAULT but has a bug in its
611 implementation that causes some problems.
612 Everybody who wants to run Linux under VM != VM4.2 should select
616 bool "VM shared kernel support"
617 depends on !JUMP_LABEL
619 Select this option, if you want to share the text segment of the
620 Linux kernel between different VM guests. This reduces memory
621 usage with lots of guests but greatly increases kernel size.
622 Also if a kernel was IPL'ed from a shared segment the kexec system
624 You should only select this option if you know what you are
625 doing and want to exploit this feature.
629 prompt "Cooperative memory management"
631 Select this option, if you want to enable the kernel interface
632 to reduce the memory size of the system. This is accomplished
633 by allocating pages of memory and put them "on hold". This only
634 makes sense for a system running under VM where the unused pages
635 will be reused by VM for other guest systems. The interface
636 allows an external monitor to balance memory of many systems.
637 Everybody who wants to run Linux under VM should select this
642 prompt "IUCV special message interface to cooperative memory management"
643 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
645 Select this option to enable the special message interface to
646 the cooperative memory management.
650 prompt "Linux - VM Monitor Stream, base infrastructure"
653 This provides a kernel interface for creating and updating z/VM APPLDATA
654 monitor records. The monitor records are updated at certain time
655 intervals, once the timer is started.
656 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
657 i.e. enables or disables monitoring on the Linux side.
658 A custom interval value (in seconds) can be written to
659 /proc/appldata/interval.
661 Defaults are 60 seconds interval and timer off.
662 The /proc entries can also be read from, showing the current settings.
666 prompt "Monitor memory management statistics"
667 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
669 This provides memory management related data to the Linux - VM Monitor
670 Stream, like paging/swapping rate, memory utilisation, etc.
671 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
672 APPLDATA monitor record, i.e. enables or disables monitoring this record
676 The /proc entry can also be read from, showing the current settings.
678 This can also be compiled as a module, which will be called
683 prompt "Monitor OS statistics"
684 depends on APPLDATA_BASE
686 This provides OS related data to the Linux - VM Monitor Stream, like
687 CPU utilisation, etc.
688 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
689 APPLDATA monitor record, i.e. enables or disables monitoring this record
693 This can also be compiled as a module, which will be called
696 config APPLDATA_NET_SUM
698 prompt "Monitor overall network statistics"
699 depends on APPLDATA_BASE && NET
701 This provides network related data to the Linux - VM Monitor Stream,
702 currently there is only a total sum of network I/O statistics, no
704 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
705 APPLDATA monitor record, i.e. enables or disables monitoring this record
709 This can also be compiled as a module, which will be called
714 prompt "s390 hypervisor file system support"
715 select SYS_HYPERVISOR
717 This is a virtual file system intended to provide accounting
718 information in an s390 hypervisor environment.
720 source "arch/s390/kvm/Kconfig"
724 prompt "s390 support for virtio devices"
727 select VIRTUALIZATION
729 select VIRTIO_CONSOLE
731 Enabling this option adds support for virtio based paravirtual device
734 Select this option if you want to run the kernel as a guest under