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
61 config ARCH_SUPPORTS_UPROBES
66 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
67 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAVE_NMI_SAFE_CMPXCHG
70 select ARCH_INLINE_READ_LOCK
71 select ARCH_INLINE_READ_LOCK_BH
72 select ARCH_INLINE_READ_LOCK_IRQ
73 select ARCH_INLINE_READ_LOCK_IRQSAVE
74 select ARCH_INLINE_READ_TRYLOCK
75 select ARCH_INLINE_READ_UNLOCK
76 select ARCH_INLINE_READ_UNLOCK_BH
77 select ARCH_INLINE_READ_UNLOCK_IRQ
78 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
79 select ARCH_INLINE_SPIN_LOCK
80 select ARCH_INLINE_SPIN_LOCK_BH
81 select ARCH_INLINE_SPIN_LOCK_IRQ
82 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
83 select ARCH_INLINE_SPIN_TRYLOCK
84 select ARCH_INLINE_SPIN_TRYLOCK_BH
85 select ARCH_INLINE_SPIN_UNLOCK
86 select ARCH_INLINE_SPIN_UNLOCK_BH
87 select ARCH_INLINE_SPIN_UNLOCK_IRQ
88 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
89 select ARCH_INLINE_WRITE_LOCK
90 select ARCH_INLINE_WRITE_LOCK_BH
91 select ARCH_INLINE_WRITE_LOCK_IRQ
92 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
93 select ARCH_INLINE_WRITE_TRYLOCK
94 select ARCH_INLINE_WRITE_UNLOCK
95 select ARCH_INLINE_WRITE_UNLOCK_BH
96 select ARCH_INLINE_WRITE_UNLOCK_IRQ
97 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
98 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
99 select ARCH_SUPPORTS_ATOMIC_RMW
100 select ARCH_USE_CMPXCHG_LOCKREF
101 select ARCH_WANT_IPC_PARSE_VERSION
102 select BUILDTIME_EXTABLE_SORT
103 select CLONE_BACKWARDS2
104 select DYNAMIC_FTRACE if FUNCTION_TRACER
105 select GENERIC_CLOCKEVENTS
106 select GENERIC_CPU_DEVICES if !SMP
107 select GENERIC_FIND_FIRST_BIT
108 select GENERIC_SMP_IDLE_THREAD
109 select GENERIC_TIME_VSYSCALL
110 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
111 select HAVE_ARCH_AUDITSYSCALL
112 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
113 select HAVE_ARCH_SECCOMP_FILTER
114 select HAVE_ARCH_TRACEHOOK
115 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
116 select HAVE_BPF_JIT if 64BIT && PACK_STACK
117 select HAVE_CMPXCHG_DOUBLE
118 select HAVE_CMPXCHG_LOCAL
119 select HAVE_C_RECORDMCOUNT
120 select HAVE_DEBUG_KMEMLEAK
121 select HAVE_DYNAMIC_FTRACE if 64BIT
122 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
125 select HAVE_FUNCTION_TRACER if 64BIT
126 select HAVE_FUTEX_CMPXCHG if FUTEX
127 select HAVE_KERNEL_BZIP2
128 select HAVE_KERNEL_GZIP
129 select HAVE_KERNEL_LZ4
130 select HAVE_KERNEL_LZMA
131 select HAVE_KERNEL_LZO
132 select HAVE_KERNEL_XZ
134 select HAVE_KRETPROBES
135 select HAVE_KVM if 64BIT
137 select HAVE_MEMBLOCK_NODE_MAP
138 select HAVE_MEMBLOCK_PHYS_MAP
139 select HAVE_MOD_ARCH_SPECIFIC
141 select HAVE_PERF_EVENTS
142 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_SYSCALL_TRACEPOINTS
144 select HAVE_UID16 if 32BIT
145 select HAVE_VIRT_CPU_ACCOUNTING
146 select MODULES_USE_ELF_RELA
149 select OLD_SIGSUSPEND3
150 select SYSCTL_EXCEPTION_TRACE
152 select VIRT_CPU_ACCOUNTING
154 select ARCH_HAS_SG_CHAIN
156 config SCHED_OMIT_FRAME_POINTER
159 source "init/Kconfig"
161 source "kernel/Kconfig.freezer"
163 menu "Processor type and features"
165 config HAVE_MARCH_Z900_FEATURES
168 config HAVE_MARCH_Z990_FEATURES
170 select HAVE_MARCH_Z900_FEATURES
172 config HAVE_MARCH_Z9_109_FEATURES
174 select HAVE_MARCH_Z990_FEATURES
176 config HAVE_MARCH_Z10_FEATURES
178 select HAVE_MARCH_Z9_109_FEATURES
180 config HAVE_MARCH_Z196_FEATURES
182 select HAVE_MARCH_Z10_FEATURES
184 config HAVE_MARCH_ZEC12_FEATURES
186 select HAVE_MARCH_Z196_FEATURES
189 prompt "Processor type"
193 bool "System/390 model G5 and G6"
196 Select this to build a 31 bit kernel that works
197 on all ESA/390 and z/Architecture machines.
200 bool "IBM zSeries model z800 and z900"
201 select HAVE_MARCH_Z900_FEATURES if 64BIT
203 Select this to enable optimizations for model z800/z900 (2064 and
204 2066 series). This will enable some optimizations that are not
205 available on older ESA/390 (31 Bit) only CPUs.
208 bool "IBM zSeries model z890 and z990"
209 select HAVE_MARCH_Z990_FEATURES if 64BIT
211 Select this to enable optimizations for model z890/z990 (2084 and
212 2086 series). The kernel will be slightly faster but will not work
217 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
219 Select this to enable optimizations for IBM System z9 (2094 and
220 2096 series). The kernel will be slightly faster but will not work
224 bool "IBM System z10"
225 select HAVE_MARCH_Z10_FEATURES if 64BIT
227 Select this to enable optimizations for IBM System z10 (2097 and
228 2098 series). The kernel will be slightly faster but will not work
232 bool "IBM zEnterprise 114 and 196"
233 select HAVE_MARCH_Z196_FEATURES if 64BIT
235 Select this to enable optimizations for IBM zEnterprise 114 and 196
236 (2818 and 2817 series). The kernel will be slightly faster but will
237 not work on older machines.
240 bool "IBM zBC12 and zEC12"
241 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
243 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
244 2827 series). The kernel will be slightly faster but will not work on
250 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
252 config MARCH_Z900_TUNE
253 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
255 config MARCH_Z990_TUNE
256 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
258 config MARCH_Z9_109_TUNE
259 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
261 config MARCH_Z10_TUNE
262 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
264 config MARCH_Z196_TUNE
265 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
267 config MARCH_ZEC12_TUNE
268 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
271 prompt "Tune code generation"
274 Cause the compiler to tune (-mtune) the generated code for a machine.
275 This will make the code run faster on the selected machine but
276 somewhat slower on other machines.
277 This option only changes how the compiler emits instructions, not the
278 selection of instructions itself, so the resulting kernel will run on
284 Tune the generated code for the target processor for which the kernel
288 bool "System/390 model G5 and G6"
291 bool "IBM zSeries model z800 and z900"
294 bool "IBM zSeries model z890 and z990"
300 bool "IBM System z10"
303 bool "IBM zEnterprise 114 and 196"
306 bool "IBM zBC12 and zEC12"
312 prompt "64 bit kernel"
314 Select this option if you have an IBM z/Architecture machine
315 and want to use the 64 bit addressing mode.
322 prompt "Kernel support for 31 bit emulation"
324 select COMPAT_BINFMT_ELF if BINFMT_ELF
325 select ARCH_WANT_OLD_COMPAT_IPC
326 select COMPAT_OLD_SIGACTION
328 Select this option if you want to enable your system kernel to
329 handle system-calls from ELF binaries for 31 bit ESA. This option
330 (and some other stuff like libraries and such) is needed for
331 executing 31 bit applications. It is safe to say "Y".
333 config SYSVIPC_COMPAT
334 def_bool y if COMPAT && SYSVIPC
337 def_bool y if COMPAT && KEYS
341 prompt "Symmetric multi-processing support"
343 This enables support for systems with more than one CPU. If you have
344 a system with only one CPU, like most personal computers, say N. If
345 you have a system with more than one CPU, say Y.
347 If you say N here, the kernel will run on uni- and multiprocessor
348 machines, but will use only one CPU of a multiprocessor machine. If
349 you say Y here, the kernel will run on many, but not all,
350 uniprocessor machines. On a uniprocessor machine, the kernel
351 will run faster if you say N here.
353 See also the SMP-HOWTO available at
354 <http://www.tldp.org/docs.html#howto>.
356 Even if you don't know what to do here, say Y.
359 int "Maximum number of CPUs (2-256)"
362 default "32" if !64BIT
363 default "64" if 64BIT
365 This allows you to specify the maximum number of CPUs which this
366 kernel will support. The maximum supported value is 256 and the
367 minimum value which makes sense is 2.
369 This is purely to save memory - each supported CPU adds
370 approximately sixteen kilobytes to the kernel image.
374 prompt "Support for hot-pluggable CPUs"
377 Say Y here to be able to turn CPUs off and on. CPUs
378 can be controlled through /sys/devices/system/cpu/cpu#.
379 Say N if you want to disable CPU hotplug.
386 prompt "Book scheduler support"
390 Book scheduler support improves the CPU scheduler's decision making
391 when dealing with machines that have several books.
393 source kernel/Kconfig.preempt
397 prompt "IEEE FPU emulation"
400 This option is required for IEEE compliant floating point arithmetic
401 on older ESA/390 machines. Say Y unless you know your machine doesn't
404 source kernel/Kconfig.hz
410 config ARCH_SPARSEMEM_ENABLE
412 select SPARSEMEM_VMEMMAP_ENABLE
413 select SPARSEMEM_VMEMMAP
414 select SPARSEMEM_STATIC if !64BIT
416 config ARCH_SPARSEMEM_DEFAULT
419 config ARCH_SELECT_MEMORY_MODEL
422 config ARCH_ENABLE_MEMORY_HOTPLUG
423 def_bool y if SPARSEMEM
425 config ARCH_ENABLE_MEMORY_HOTREMOVE
428 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
432 config FORCE_MAX_ZONEORDER
440 prompt "Pack kernel stack"
442 This option enables the compiler option -mkernel-backchain if it
443 is available. If the option is available the compiler supports
444 the new stack layout which dramatically reduces the minimum stack
445 frame size. With an old compiler a non-leaf function needs a
446 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
447 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
448 and 24 byte on 64 bit.
450 Say Y if you are unsure.
454 prompt "Detect kernel stack overflow"
456 This option enables the compiler option -mstack-guard and
457 -mstack-size if they are available. If the compiler supports them
458 it will emit additional code to each function prolog to trigger
459 an illegal operation if the kernel stack is about to overflow.
461 Say N if you are unsure.
464 int "Size of the guard area (128-1024)"
466 depends on CHECK_STACK
469 This allows you to specify the size of the guard area at the lower
470 end of the kernel stack. If the kernel stack points into the guard
471 area on function entry an illegal operation is triggered. The size
472 needs to be a power of 2. Please keep in mind that the size of an
473 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
474 The minimum size for the stack guard should be 256 for 31 bit and
477 config WARN_DYNAMIC_STACK
479 prompt "Emit compiler warnings for function with dynamic stack usage"
481 This option enables the compiler option -mwarn-dynamicstack. If the
482 compiler supports this options generates warnings for functions
483 that dynamically allocate stack space using alloca.
485 Say N if you are unsure.
493 prompt "QDIO support"
495 This driver provides the Queued Direct I/O base support for
498 To compile this driver as a module, choose M here: the
499 module will be called qdio.
506 select HAVE_DMA_ATTRS
513 config PCI_NR_FUNCTIONS
514 int "Maximum number of PCI functions (1-4096)"
518 This allows you to specify the maximum number of PCI functions which
519 this kernel will support.
522 int "Maximum number of MSI interrupts (64-32768)"
526 This defines the number of virtual interrupts the kernel will
527 provide for MSI interrupts. If you configure your system to have
528 too few drivers will fail to allocate MSI interrupts for all
531 source "drivers/pci/Kconfig"
532 source "drivers/pci/pcie/Kconfig"
533 source "drivers/pci/hotplug/Kconfig"
548 select HAVE_DMA_API_DEBUG
550 config NEED_SG_DMA_LENGTH
553 config NEED_DMA_MAP_STATE
558 prompt "Support for CHSC subchannels"
560 This driver allows usage of CHSC subchannels. A CHSC subchannel
561 is usually present on LPAR only.
562 The driver creates a device /dev/chsc, which may be used to
563 obtain I/O configuration information about the machine and
564 to issue asynchronous chsc commands (DANGEROUS).
565 You will usually only want to use this interface on a special
566 LPAR designated for system management.
568 To compile this driver as a module, choose M here: the
569 module will be called chsc_sch.
576 prompt "SCM bus driver"
578 Bus driver for Storage Class Memory.
582 prompt "Support for EADM subchannels"
585 This driver allows usage of EADM subchannels. EADM subchannels act
586 as a communication vehicle for SCM increments.
588 To compile this driver as a module, choose M here: the
589 module will be called eadm_sch.
596 bool "kernel crash dumps"
597 depends on 64BIT && SMP
600 Generate crash dump after being started by kexec.
601 Crash dump kernels are loaded in the main kernel with kexec-tools
602 into a specially reserved region and then later executed after
603 a crash by kdump/kexec.
604 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
605 This option also enables s390 zfcpdump.
606 See also <file:Documentation/s390/zfcpdump.txt>
610 menu "Executable file formats / Emulations"
612 source "fs/Kconfig.binfmt"
616 prompt "Enable seccomp to safely compute untrusted bytecode"
619 This kernel feature is useful for number crunching applications
620 that may need to compute untrusted bytecode during their
621 execution. By using pipes or other transports made available to
622 the process as file descriptors supporting the read/write
623 syscalls, it's possible to isolate those applications in
624 their own address space using seccomp. Once seccomp is
625 enabled via /proc/<pid>/seccomp, it cannot be disabled
626 and the task is only allowed to execute a few safe syscalls
627 defined by each seccomp mode.
633 menu "Power Management"
635 config ARCH_HIBERNATION_POSSIBLE
638 source "kernel/power/Kconfig"
650 source "drivers/Kconfig"
654 source "arch/s390/Kconfig.debug"
656 source "security/Kconfig"
658 source "crypto/Kconfig"
662 menu "Virtualization"
666 prompt "Pseudo page fault support"
668 Select this option, if you want to use PFAULT pseudo page fault
669 handling under VM. If running native or in LPAR, this option
670 has no effect. If your VM does not support PFAULT, PAGEEX
671 pseudo page fault handling will be used.
672 Note that VM 4.2 supports PFAULT but has a bug in its
673 implementation that causes some problems.
674 Everybody who wants to run Linux under VM != VM4.2 should select
678 bool "VM shared kernel support"
679 depends on !JUMP_LABEL
681 Select this option, if you want to share the text segment of the
682 Linux kernel between different VM guests. This reduces memory
683 usage with lots of guests but greatly increases kernel size.
684 Also if a kernel was IPL'ed from a shared segment the kexec system
686 You should only select this option if you know what you are
687 doing and want to exploit this feature.
691 prompt "Cooperative memory management"
693 Select this option, if you want to enable the kernel interface
694 to reduce the memory size of the system. This is accomplished
695 by allocating pages of memory and put them "on hold". This only
696 makes sense for a system running under VM where the unused pages
697 will be reused by VM for other guest systems. The interface
698 allows an external monitor to balance memory of many systems.
699 Everybody who wants to run Linux under VM should select this
704 prompt "IUCV special message interface to cooperative memory management"
705 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
707 Select this option to enable the special message interface to
708 the cooperative memory management.
712 prompt "Linux - VM Monitor Stream, base infrastructure"
715 This provides a kernel interface for creating and updating z/VM APPLDATA
716 monitor records. The monitor records are updated at certain time
717 intervals, once the timer is started.
718 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
719 i.e. enables or disables monitoring on the Linux side.
720 A custom interval value (in seconds) can be written to
721 /proc/appldata/interval.
723 Defaults are 60 seconds interval and timer off.
724 The /proc entries can also be read from, showing the current settings.
728 prompt "Monitor memory management statistics"
729 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
731 This provides memory management related data to the Linux - VM Monitor
732 Stream, like paging/swapping rate, memory utilisation, etc.
733 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
734 APPLDATA monitor record, i.e. enables or disables monitoring this record
738 The /proc entry can also be read from, showing the current settings.
740 This can also be compiled as a module, which will be called
745 prompt "Monitor OS statistics"
746 depends on APPLDATA_BASE
748 This provides OS related data to the Linux - VM Monitor Stream, like
749 CPU utilisation, etc.
750 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
751 APPLDATA monitor record, i.e. enables or disables monitoring this record
755 This can also be compiled as a module, which will be called
758 config APPLDATA_NET_SUM
760 prompt "Monitor overall network statistics"
761 depends on APPLDATA_BASE && NET
763 This provides network related data to the Linux - VM Monitor Stream,
764 currently there is only a total sum of network I/O statistics, no
766 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
767 APPLDATA monitor record, i.e. enables or disables monitoring this record
771 This can also be compiled as a module, which will be called
776 prompt "s390 hypervisor file system support"
777 select SYS_HYPERVISOR
779 This is a virtual file system intended to provide accounting
780 information in an s390 hypervisor environment.
782 source "arch/s390/kvm/Kconfig"
786 prompt "s390 support for virtio devices"
789 select VIRTUALIZATION
791 select VIRTIO_CONSOLE
793 Enabling this option adds support for virtio based paravirtual device
796 Select this option if you want to run the kernel as a guest under