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_USE_CMPXCHG_LOCKREF
97 select ARCH_WANT_IPC_PARSE_VERSION
98 select BUILDTIME_EXTABLE_SORT
99 select CLONE_BACKWARDS2
100 select GENERIC_CLOCKEVENTS
101 select GENERIC_CPU_DEVICES if !SMP
102 select GENERIC_SMP_IDLE_THREAD
103 select GENERIC_TIME_VSYSCALL_OLD
104 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
105 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
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_LZ4
122 select HAVE_KERNEL_LZMA
123 select HAVE_KERNEL_LZO
124 select HAVE_KERNEL_XZ
126 select HAVE_KRETPROBES
127 select HAVE_KVM if 64BIT
129 select HAVE_MEMBLOCK_NODE_MAP
130 select HAVE_MOD_ARCH_SPECIFIC
132 select HAVE_PERF_EVENTS
133 select HAVE_REGS_AND_STACK_ACCESS_API
134 select HAVE_SYSCALL_TRACEPOINTS
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
141 select OLD_SIGSUSPEND3
142 select SYSCTL_EXCEPTION_TRACE
143 select USE_GENERIC_SMP_HELPERS if SMP
144 select VIRT_CPU_ACCOUNTING
147 config SCHED_OMIT_FRAME_POINTER
150 source "init/Kconfig"
152 source "kernel/Kconfig.freezer"
154 menu "Processor type and features"
156 config HAVE_MARCH_Z900_FEATURES
159 config HAVE_MARCH_Z990_FEATURES
161 select HAVE_MARCH_Z900_FEATURES
163 config HAVE_MARCH_Z9_109_FEATURES
165 select HAVE_MARCH_Z990_FEATURES
167 config HAVE_MARCH_Z10_FEATURES
169 select HAVE_MARCH_Z9_109_FEATURES
171 config HAVE_MARCH_Z196_FEATURES
173 select HAVE_MARCH_Z10_FEATURES
175 config HAVE_MARCH_ZEC12_FEATURES
177 select HAVE_MARCH_Z196_FEATURES
180 prompt "Processor type"
184 bool "System/390 model G5 and G6"
187 Select this to build a 31 bit kernel that works
188 on all ESA/390 and z/Architecture machines.
191 bool "IBM zSeries model z800 and z900"
192 select HAVE_MARCH_Z900_FEATURES if 64BIT
194 Select this to enable optimizations for model z800/z900 (2064 and
195 2066 series). This will enable some optimizations that are not
196 available on older ESA/390 (31 Bit) only CPUs.
199 bool "IBM zSeries model z890 and z990"
200 select HAVE_MARCH_Z990_FEATURES if 64BIT
202 Select this to enable optimizations for model z890/z990 (2084 and
203 2086 series). The kernel will be slightly faster but will not work
208 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
210 Select this to enable optimizations for IBM System z9 (2094 and
211 2096 series). The kernel will be slightly faster but will not work
215 bool "IBM System z10"
216 select HAVE_MARCH_Z10_FEATURES if 64BIT
218 Select this to enable optimizations for IBM System z10 (2097 and
219 2098 series). The kernel will be slightly faster but will not work
223 bool "IBM zEnterprise 114 and 196"
224 select HAVE_MARCH_Z196_FEATURES if 64BIT
226 Select this to enable optimizations for IBM zEnterprise 114 and 196
227 (2818 and 2817 series). The kernel will be slightly faster but will
228 not work on older machines.
231 bool "IBM zBC12 and zEC12"
232 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
234 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
235 2827 series). The kernel will be slightly faster but will not work on
242 prompt "64 bit kernel"
244 Select this option if you have an IBM z/Architecture machine
245 and want to use the 64 bit addressing mode.
252 prompt "Kernel support for 31 bit emulation"
254 select COMPAT_BINFMT_ELF if BINFMT_ELF
255 select ARCH_WANT_OLD_COMPAT_IPC
256 select COMPAT_OLD_SIGACTION
258 Select this option if you want to enable your system kernel to
259 handle system-calls from ELF binaries for 31 bit ESA. This option
260 (and some other stuff like libraries and such) is needed for
261 executing 31 bit applications. It is safe to say "Y".
263 config SYSVIPC_COMPAT
264 def_bool y if COMPAT && SYSVIPC
267 def_bool y if COMPAT && KEYS
271 prompt "Symmetric multi-processing support"
273 This enables support for systems with more than one CPU. If you have
274 a system with only one CPU, like most personal computers, say N. If
275 you have a system with more than one CPU, say Y.
277 If you say N here, the kernel will run on single and multiprocessor
278 machines, but will use only one CPU of a multiprocessor machine. If
279 you say Y here, the kernel will run on many, but not all,
280 singleprocessor machines. On a singleprocessor machine, the kernel
281 will run faster if you say N here.
283 See also the SMP-HOWTO available at
284 <http://www.tldp.org/docs.html#howto>.
286 Even if you don't know what to do here, say Y.
289 int "Maximum number of CPUs (2-64)"
292 default "32" if !64BIT
293 default "64" if 64BIT
295 This allows you to specify the maximum number of CPUs which this
296 kernel will support. The maximum supported value is 64 and the
297 minimum value which makes sense is 2.
299 This is purely to save memory - each supported CPU adds
300 approximately sixteen kilobytes to the kernel image.
304 prompt "Support for hot-pluggable CPUs"
307 Say Y here to be able to turn CPUs off and on. CPUs
308 can be controlled through /sys/devices/system/cpu/cpu#.
309 Say N if you want to disable CPU hotplug.
316 prompt "Book scheduler support"
320 Book scheduler support improves the CPU scheduler's decision making
321 when dealing with machines that have several books.
323 source kernel/Kconfig.preempt
327 prompt "IEEE FPU emulation"
330 This option is required for IEEE compliant floating point arithmetic
331 on older ESA/390 machines. Say Y unless you know your machine doesn't
334 source kernel/Kconfig.hz
340 config ARCH_SPARSEMEM_ENABLE
342 select SPARSEMEM_VMEMMAP_ENABLE
343 select SPARSEMEM_VMEMMAP
344 select SPARSEMEM_STATIC if !64BIT
346 config ARCH_SPARSEMEM_DEFAULT
349 config ARCH_SELECT_MEMORY_MODEL
352 config ARCH_ENABLE_MEMORY_HOTPLUG
353 def_bool y if SPARSEMEM
355 config ARCH_ENABLE_MEMORY_HOTREMOVE
358 config FORCE_MAX_ZONEORDER
366 prompt "Pack kernel stack"
368 This option enables the compiler option -mkernel-backchain if it
369 is available. If the option is available the compiler supports
370 the new stack layout which dramatically reduces the minimum stack
371 frame size. With an old compiler a non-leaf function needs a
372 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
373 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
374 and 24 byte on 64 bit.
376 Say Y if you are unsure.
380 prompt "Detect kernel stack overflow"
382 This option enables the compiler option -mstack-guard and
383 -mstack-size if they are available. If the compiler supports them
384 it will emit additional code to each function prolog to trigger
385 an illegal operation if the kernel stack is about to overflow.
387 Say N if you are unsure.
390 int "Size of the guard area (128-1024)"
392 depends on CHECK_STACK
395 This allows you to specify the size of the guard area at the lower
396 end of the kernel stack. If the kernel stack points into the guard
397 area on function entry an illegal operation is triggered. The size
398 needs to be a power of 2. Please keep in mind that the size of an
399 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
400 The minimum size for the stack guard should be 256 for 31 bit and
403 config WARN_DYNAMIC_STACK
405 prompt "Emit compiler warnings for function with dynamic stack usage"
407 This option enables the compiler option -mwarn-dynamicstack. If the
408 compiler supports this options generates warnings for functions
409 that dynamically allocate stack space using alloca.
411 Say N if you are unsure.
419 prompt "QDIO support"
421 This driver provides the Queued Direct I/O base support for
424 To compile this driver as a module, choose M here: the
425 module will be called qdio.
439 config PCI_NR_FUNCTIONS
440 int "Maximum number of PCI functions (1-4096)"
444 This allows you to specify the maximum number of PCI functions which
445 this kernel will support.
448 int "Maximum number of MSI interrupts (64-32768)"
452 This defines the number of virtual interrupts the kernel will
453 provide for MSI interrupts. If you configure your system to have
454 too few drivers will fail to allocate MSI interrupts for all
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
530 Generate crash dump after being started by kexec.
531 Crash dump kernels are loaded in the main kernel with kexec-tools
532 into a specially reserved region and then later executed after
533 a crash by kdump/kexec.
534 For more details see Documentation/kdump/kdump.txt
538 prompt "zfcpdump support"
541 Select this option if you want to build an zfcpdump enabled kernel.
542 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
546 menu "Executable file formats / Emulations"
548 source "fs/Kconfig.binfmt"
552 prompt "Enable seccomp to safely compute untrusted bytecode"
555 This kernel feature is useful for number crunching applications
556 that may need to compute untrusted bytecode during their
557 execution. By using pipes or other transports made available to
558 the process as file descriptors supporting the read/write
559 syscalls, it's possible to isolate those applications in
560 their own address space using seccomp. Once seccomp is
561 enabled via /proc/<pid>/seccomp, it cannot be disabled
562 and the task is only allowed to execute a few safe syscalls
563 defined by each seccomp mode.
569 menu "Power Management"
571 config ARCH_HIBERNATION_POSSIBLE
574 source "kernel/power/Kconfig"
586 source "drivers/Kconfig"
590 source "arch/s390/Kconfig.debug"
592 source "security/Kconfig"
594 source "crypto/Kconfig"
598 menu "Virtualization"
602 prompt "Pseudo page fault support"
604 Select this option, if you want to use PFAULT pseudo page fault
605 handling under VM. If running native or in LPAR, this option
606 has no effect. If your VM does not support PFAULT, PAGEEX
607 pseudo page fault handling will be used.
608 Note that VM 4.2 supports PFAULT but has a bug in its
609 implementation that causes some problems.
610 Everybody who wants to run Linux under VM != VM4.2 should select
614 bool "VM shared kernel support"
615 depends on !JUMP_LABEL
617 Select this option, if you want to share the text segment of the
618 Linux kernel between different VM guests. This reduces memory
619 usage with lots of guests but greatly increases kernel size.
620 Also if a kernel was IPL'ed from a shared segment the kexec system
622 You should only select this option if you know what you are
623 doing and want to exploit this feature.
627 prompt "Cooperative memory management"
629 Select this option, if you want to enable the kernel interface
630 to reduce the memory size of the system. This is accomplished
631 by allocating pages of memory and put them "on hold". This only
632 makes sense for a system running under VM where the unused pages
633 will be reused by VM for other guest systems. The interface
634 allows an external monitor to balance memory of many systems.
635 Everybody who wants to run Linux under VM should select this
640 prompt "IUCV special message interface to cooperative memory management"
641 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
643 Select this option to enable the special message interface to
644 the cooperative memory management.
648 prompt "Linux - VM Monitor Stream, base infrastructure"
651 This provides a kernel interface for creating and updating z/VM APPLDATA
652 monitor records. The monitor records are updated at certain time
653 intervals, once the timer is started.
654 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
655 i.e. enables or disables monitoring on the Linux side.
656 A custom interval value (in seconds) can be written to
657 /proc/appldata/interval.
659 Defaults are 60 seconds interval and timer off.
660 The /proc entries can also be read from, showing the current settings.
664 prompt "Monitor memory management statistics"
665 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
667 This provides memory management related data to the Linux - VM Monitor
668 Stream, like paging/swapping rate, memory utilisation, etc.
669 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
670 APPLDATA monitor record, i.e. enables or disables monitoring this record
674 The /proc entry can also be read from, showing the current settings.
676 This can also be compiled as a module, which will be called
681 prompt "Monitor OS statistics"
682 depends on APPLDATA_BASE
684 This provides OS related data to the Linux - VM Monitor Stream, like
685 CPU utilisation, etc.
686 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
687 APPLDATA monitor record, i.e. enables or disables monitoring this record
691 This can also be compiled as a module, which will be called
694 config APPLDATA_NET_SUM
696 prompt "Monitor overall network statistics"
697 depends on APPLDATA_BASE && NET
699 This provides network related data to the Linux - VM Monitor Stream,
700 currently there is only a total sum of network I/O statistics, no
702 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
703 APPLDATA monitor record, i.e. enables or disables monitoring this record
707 This can also be compiled as a module, which will be called
712 prompt "s390 hypervisor file system support"
713 select SYS_HYPERVISOR
715 This is a virtual file system intended to provide accounting
716 information in an s390 hypervisor environment.
718 source "arch/s390/kvm/Kconfig"
722 prompt "s390 support for virtio devices"
725 select VIRTUALIZATION
727 select VIRTIO_CONSOLE
729 Enabling this option adds support for virtio based paravirtual device
732 Select this option if you want to run the kernel as a guest under