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_HAS_SG_CHAIN
70 select ARCH_HAVE_NMI_SAFE_CMPXCHG
71 select ARCH_INLINE_READ_LOCK
72 select ARCH_INLINE_READ_LOCK_BH
73 select ARCH_INLINE_READ_LOCK_IRQ
74 select ARCH_INLINE_READ_LOCK_IRQSAVE
75 select ARCH_INLINE_READ_TRYLOCK
76 select ARCH_INLINE_READ_UNLOCK
77 select ARCH_INLINE_READ_UNLOCK_BH
78 select ARCH_INLINE_READ_UNLOCK_IRQ
79 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
80 select ARCH_INLINE_SPIN_LOCK
81 select ARCH_INLINE_SPIN_LOCK_BH
82 select ARCH_INLINE_SPIN_LOCK_IRQ
83 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
84 select ARCH_INLINE_SPIN_TRYLOCK
85 select ARCH_INLINE_SPIN_TRYLOCK_BH
86 select ARCH_INLINE_SPIN_UNLOCK
87 select ARCH_INLINE_SPIN_UNLOCK_BH
88 select ARCH_INLINE_SPIN_UNLOCK_IRQ
89 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
90 select ARCH_INLINE_WRITE_LOCK
91 select ARCH_INLINE_WRITE_LOCK_BH
92 select ARCH_INLINE_WRITE_LOCK_IRQ
93 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
94 select ARCH_INLINE_WRITE_TRYLOCK
95 select ARCH_INLINE_WRITE_UNLOCK
96 select ARCH_INLINE_WRITE_UNLOCK_BH
97 select ARCH_INLINE_WRITE_UNLOCK_IRQ
98 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
99 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
100 select ARCH_SUPPORTS_ATOMIC_RMW
101 select ARCH_USE_CMPXCHG_LOCKREF
102 select ARCH_WANT_IPC_PARSE_VERSION
103 select BUILDTIME_EXTABLE_SORT
104 select CLONE_BACKWARDS2
105 select DYNAMIC_FTRACE if FUNCTION_TRACER
106 select GENERIC_CLOCKEVENTS
107 select GENERIC_CPU_DEVICES if !SMP
108 select GENERIC_FIND_FIRST_BIT
109 select GENERIC_SMP_IDLE_THREAD
110 select GENERIC_TIME_VSYSCALL
111 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
112 select HAVE_ARCH_AUDITSYSCALL
113 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
114 select HAVE_ARCH_SECCOMP_FILTER
115 select HAVE_ARCH_TRACEHOOK
116 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
117 select HAVE_BPF_JIT if 64BIT && PACK_STACK
118 select HAVE_CMPXCHG_DOUBLE
119 select HAVE_CMPXCHG_LOCAL
120 select HAVE_C_RECORDMCOUNT
121 select HAVE_DEBUG_KMEMLEAK
122 select HAVE_DYNAMIC_FTRACE if 64BIT
123 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
124 select HAVE_FTRACE_MCOUNT_RECORD
125 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
126 select HAVE_FUNCTION_TRACER if 64BIT
127 select HAVE_FUTEX_CMPXCHG if FUTEX
128 select HAVE_KERNEL_BZIP2
129 select HAVE_KERNEL_GZIP
130 select HAVE_KERNEL_LZ4
131 select HAVE_KERNEL_LZMA
132 select HAVE_KERNEL_LZO
133 select HAVE_KERNEL_XZ
135 select HAVE_KRETPROBES
136 select HAVE_KVM if 64BIT
138 select HAVE_MEMBLOCK_NODE_MAP
139 select HAVE_MEMBLOCK_PHYS_MAP
140 select HAVE_MOD_ARCH_SPECIFIC
142 select HAVE_PERF_EVENTS
143 select HAVE_REGS_AND_STACK_ACCESS_API
144 select HAVE_SYSCALL_TRACEPOINTS
145 select HAVE_UID16 if 32BIT
146 select HAVE_VIRT_CPU_ACCOUNTING
147 select MODULES_USE_ELF_RELA
150 select OLD_SIGSUSPEND3
151 select SYSCTL_EXCEPTION_TRACE
153 select VIRT_CPU_ACCOUNTING
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
188 config HAVE_MARCH_Z13_FEATURES
190 select HAVE_MARCH_ZEC12_FEATURES
193 prompt "Processor type"
197 bool "System/390 model G5 and G6"
200 Select this to build a 31 bit kernel that works
201 on all ESA/390 and z/Architecture machines.
204 bool "IBM zSeries model z800 and z900"
205 select HAVE_MARCH_Z900_FEATURES if 64BIT
207 Select this to enable optimizations for model z800/z900 (2064 and
208 2066 series). This will enable some optimizations that are not
209 available on older ESA/390 (31 Bit) only CPUs.
212 bool "IBM zSeries model z890 and z990"
213 select HAVE_MARCH_Z990_FEATURES if 64BIT
215 Select this to enable optimizations for model z890/z990 (2084 and
216 2086 series). The kernel will be slightly faster but will not work
221 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
223 Select this to enable optimizations for IBM System z9 (2094 and
224 2096 series). The kernel will be slightly faster but will not work
228 bool "IBM System z10"
229 select HAVE_MARCH_Z10_FEATURES if 64BIT
231 Select this to enable optimizations for IBM System z10 (2097 and
232 2098 series). The kernel will be slightly faster but will not work
236 bool "IBM zEnterprise 114 and 196"
237 select HAVE_MARCH_Z196_FEATURES if 64BIT
239 Select this to enable optimizations for IBM zEnterprise 114 and 196
240 (2818 and 2817 series). The kernel will be slightly faster but will
241 not work on older machines.
244 bool "IBM zBC12 and zEC12"
245 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
247 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
248 2827 series). The kernel will be slightly faster but will not work on
253 select HAVE_MARCH_Z13_FEATURES if 64BIT
255 Select this to enable optimizations for IBM z13 (2964 series).
256 The kernel will be slightly faster but will not work on older
262 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
264 config MARCH_Z900_TUNE
265 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
267 config MARCH_Z990_TUNE
268 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
270 config MARCH_Z9_109_TUNE
271 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
273 config MARCH_Z10_TUNE
274 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
276 config MARCH_Z196_TUNE
277 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
279 config MARCH_ZEC12_TUNE
280 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
282 config MARCH_Z13_TUNE
283 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
286 prompt "Tune code generation"
289 Cause the compiler to tune (-mtune) the generated code for a machine.
290 This will make the code run faster on the selected machine but
291 somewhat slower on other machines.
292 This option only changes how the compiler emits instructions, not the
293 selection of instructions itself, so the resulting kernel will run on
299 Tune the generated code for the target processor for which the kernel
303 bool "System/390 model G5 and G6"
306 bool "IBM zSeries model z800 and z900"
309 bool "IBM zSeries model z890 and z990"
315 bool "IBM System z10"
318 bool "IBM zEnterprise 114 and 196"
321 bool "IBM zBC12 and zEC12"
330 prompt "64 bit kernel"
332 Select this option if you have an IBM z/Architecture machine
333 and want to use the 64 bit addressing mode.
340 prompt "Kernel support for 31 bit emulation"
342 select COMPAT_BINFMT_ELF if BINFMT_ELF
343 select ARCH_WANT_OLD_COMPAT_IPC
344 select COMPAT_OLD_SIGACTION
346 Select this option if you want to enable your system kernel to
347 handle system-calls from ELF binaries for 31 bit ESA. This option
348 (and some other stuff like libraries and such) is needed for
349 executing 31 bit applications. It is safe to say "Y".
351 config SYSVIPC_COMPAT
352 def_bool y if COMPAT && SYSVIPC
355 def_bool y if COMPAT && KEYS
359 prompt "Symmetric multi-processing support"
361 This enables support for systems with more than one CPU. If you have
362 a system with only one CPU, like most personal computers, say N. If
363 you have a system with more than one CPU, say Y.
365 If you say N here, the kernel will run on uni- and multiprocessor
366 machines, but will use only one CPU of a multiprocessor machine. If
367 you say Y here, the kernel will run on many, but not all,
368 uniprocessor machines. On a uniprocessor machine, the kernel
369 will run faster if you say N here.
371 See also the SMP-HOWTO available at
372 <http://www.tldp.org/docs.html#howto>.
374 Even if you don't know what to do here, say Y.
377 int "Maximum number of CPUs (2-256)"
380 default "32" if !64BIT
381 default "64" if 64BIT
383 This allows you to specify the maximum number of CPUs which this
384 kernel will support. The maximum supported value is 256 and the
385 minimum value which makes sense is 2.
387 This is purely to save memory - each supported CPU adds
388 approximately sixteen kilobytes to the kernel image.
392 prompt "Support for hot-pluggable CPUs"
395 Say Y here to be able to turn CPUs off and on. CPUs
396 can be controlled through /sys/devices/system/cpu/cpu#.
397 Say N if you want to disable CPU hotplug.
404 prompt "Book scheduler support"
408 Book scheduler support improves the CPU scheduler's decision making
409 when dealing with machines that have several books.
411 source kernel/Kconfig.preempt
415 prompt "IEEE FPU emulation"
418 This option is required for IEEE compliant floating point arithmetic
419 on older ESA/390 machines. Say Y unless you know your machine doesn't
422 source kernel/Kconfig.hz
428 config ARCH_SPARSEMEM_ENABLE
430 select SPARSEMEM_VMEMMAP_ENABLE
431 select SPARSEMEM_VMEMMAP
432 select SPARSEMEM_STATIC if !64BIT
434 config ARCH_SPARSEMEM_DEFAULT
437 config ARCH_SELECT_MEMORY_MODEL
440 config ARCH_ENABLE_MEMORY_HOTPLUG
441 def_bool y if SPARSEMEM
443 config ARCH_ENABLE_MEMORY_HOTREMOVE
446 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
450 config FORCE_MAX_ZONEORDER
458 prompt "Pack kernel stack"
460 This option enables the compiler option -mkernel-backchain if it
461 is available. If the option is available the compiler supports
462 the new stack layout which dramatically reduces the minimum stack
463 frame size. With an old compiler a non-leaf function needs a
464 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
465 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
466 and 24 byte on 64 bit.
468 Say Y if you are unsure.
472 prompt "Detect kernel stack overflow"
474 This option enables the compiler option -mstack-guard and
475 -mstack-size if they are available. If the compiler supports them
476 it will emit additional code to each function prolog to trigger
477 an illegal operation if the kernel stack is about to overflow.
479 Say N if you are unsure.
482 int "Size of the guard area (128-1024)"
484 depends on CHECK_STACK
487 This allows you to specify the size of the guard area at the lower
488 end of the kernel stack. If the kernel stack points into the guard
489 area on function entry an illegal operation is triggered. The size
490 needs to be a power of 2. Please keep in mind that the size of an
491 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
492 The minimum size for the stack guard should be 256 for 31 bit and
495 config WARN_DYNAMIC_STACK
497 prompt "Emit compiler warnings for function with dynamic stack usage"
499 This option enables the compiler option -mwarn-dynamicstack. If the
500 compiler supports this options generates warnings for functions
501 that dynamically allocate stack space using alloca.
503 Say N if you are unsure.
511 prompt "QDIO support"
513 This driver provides the Queued Direct I/O base support for
516 To compile this driver as a module, choose M here: the
517 module will be called qdio.
524 select HAVE_DMA_ATTRS
531 config PCI_NR_FUNCTIONS
532 int "Maximum number of PCI functions (1-4096)"
536 This allows you to specify the maximum number of PCI functions which
537 this kernel will support.
540 int "Maximum number of MSI interrupts (64-32768)"
544 This defines the number of virtual interrupts the kernel will
545 provide for MSI interrupts. If you configure your system to have
546 too few drivers will fail to allocate MSI interrupts for all
549 source "drivers/pci/Kconfig"
550 source "drivers/pci/pcie/Kconfig"
551 source "drivers/pci/hotplug/Kconfig"
566 select HAVE_DMA_API_DEBUG
568 config NEED_SG_DMA_LENGTH
571 config NEED_DMA_MAP_STATE
576 prompt "Support for CHSC subchannels"
578 This driver allows usage of CHSC subchannels. A CHSC subchannel
579 is usually present on LPAR only.
580 The driver creates a device /dev/chsc, which may be used to
581 obtain I/O configuration information about the machine and
582 to issue asynchronous chsc commands (DANGEROUS).
583 You will usually only want to use this interface on a special
584 LPAR designated for system management.
586 To compile this driver as a module, choose M here: the
587 module will be called chsc_sch.
594 prompt "SCM bus driver"
596 Bus driver for Storage Class Memory.
600 prompt "Support for EADM subchannels"
603 This driver allows usage of EADM subchannels. EADM subchannels act
604 as a communication vehicle for SCM increments.
606 To compile this driver as a module, choose M here: the
607 module will be called eadm_sch.
614 bool "kernel crash dumps"
615 depends on 64BIT && SMP
618 Generate crash dump after being started by kexec.
619 Crash dump kernels are loaded in the main kernel with kexec-tools
620 into a specially reserved region and then later executed after
621 a crash by kdump/kexec.
622 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
623 This option also enables s390 zfcpdump.
624 See also <file:Documentation/s390/zfcpdump.txt>
628 menu "Executable file formats / Emulations"
630 source "fs/Kconfig.binfmt"
634 prompt "Enable seccomp to safely compute untrusted bytecode"
637 This kernel feature is useful for number crunching applications
638 that may need to compute untrusted bytecode during their
639 execution. By using pipes or other transports made available to
640 the process as file descriptors supporting the read/write
641 syscalls, it's possible to isolate those applications in
642 their own address space using seccomp. Once seccomp is
643 enabled via /proc/<pid>/seccomp, it cannot be disabled
644 and the task is only allowed to execute a few safe syscalls
645 defined by each seccomp mode.
651 menu "Power Management"
653 config ARCH_HIBERNATION_POSSIBLE
656 source "kernel/power/Kconfig"
668 source "drivers/Kconfig"
672 source "arch/s390/Kconfig.debug"
674 source "security/Kconfig"
676 source "crypto/Kconfig"
680 menu "Virtualization"
684 prompt "Pseudo page fault support"
686 Select this option, if you want to use PFAULT pseudo page fault
687 handling under VM. If running native or in LPAR, this option
688 has no effect. If your VM does not support PFAULT, PAGEEX
689 pseudo page fault handling will be used.
690 Note that VM 4.2 supports PFAULT but has a bug in its
691 implementation that causes some problems.
692 Everybody who wants to run Linux under VM != VM4.2 should select
696 bool "VM shared kernel support"
697 depends on !JUMP_LABEL
699 Select this option, if you want to share the text segment of the
700 Linux kernel between different VM guests. This reduces memory
701 usage with lots of guests but greatly increases kernel size.
702 Also if a kernel was IPL'ed from a shared segment the kexec system
704 You should only select this option if you know what you are
705 doing and want to exploit this feature.
709 prompt "Cooperative memory management"
711 Select this option, if you want to enable the kernel interface
712 to reduce the memory size of the system. This is accomplished
713 by allocating pages of memory and put them "on hold". This only
714 makes sense for a system running under VM where the unused pages
715 will be reused by VM for other guest systems. The interface
716 allows an external monitor to balance memory of many systems.
717 Everybody who wants to run Linux under VM should select this
722 prompt "IUCV special message interface to cooperative memory management"
723 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
725 Select this option to enable the special message interface to
726 the cooperative memory management.
730 prompt "Linux - VM Monitor Stream, base infrastructure"
733 This provides a kernel interface for creating and updating z/VM APPLDATA
734 monitor records. The monitor records are updated at certain time
735 intervals, once the timer is started.
736 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
737 i.e. enables or disables monitoring on the Linux side.
738 A custom interval value (in seconds) can be written to
739 /proc/appldata/interval.
741 Defaults are 60 seconds interval and timer off.
742 The /proc entries can also be read from, showing the current settings.
746 prompt "Monitor memory management statistics"
747 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
749 This provides memory management related data to the Linux - VM Monitor
750 Stream, like paging/swapping rate, memory utilisation, etc.
751 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
752 APPLDATA monitor record, i.e. enables or disables monitoring this record
756 The /proc entry can also be read from, showing the current settings.
758 This can also be compiled as a module, which will be called
763 prompt "Monitor OS statistics"
764 depends on APPLDATA_BASE
766 This provides OS related data to the Linux - VM Monitor Stream, like
767 CPU utilisation, etc.
768 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
769 APPLDATA monitor record, i.e. enables or disables monitoring this record
773 This can also be compiled as a module, which will be called
776 config APPLDATA_NET_SUM
778 prompt "Monitor overall network statistics"
779 depends on APPLDATA_BASE && NET
781 This provides network related data to the Linux - VM Monitor Stream,
782 currently there is only a total sum of network I/O statistics, no
784 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
785 APPLDATA monitor record, i.e. enables or disables monitoring this record
789 This can also be compiled as a module, which will be called
794 prompt "s390 hypervisor file system support"
795 select SYS_HYPERVISOR
797 This is a virtual file system intended to provide accounting
798 information in an s390 hypervisor environment.
800 source "arch/s390/kvm/Kconfig"
804 prompt "s390 support for virtio devices"
807 select VIRTUALIZATION
809 select VIRTIO_CONSOLE
811 Enabling this option adds support for virtio based paravirtual device
814 Select this option if you want to run the kernel as a guest under