10 config LOCKDEP_SUPPORT
13 config STACKTRACE_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
62 config ARCH_SUPPORTS_UPROBES
70 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
71 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
72 select ARCH_HAS_DEVMEM_IS_ALLOWED
73 select ARCH_HAS_ELF_RANDOMIZE
74 select ARCH_HAS_GCOV_PROFILE_ALL
75 select ARCH_HAS_SG_CHAIN
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111 select ARCH_WANTS_PROT_NUMA_PROT_NONE
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_DEVICES if !SMP
119 select GENERIC_FIND_FIRST_BIT
120 select GENERIC_SMP_IDLE_THREAD
121 select GENERIC_TIME_VSYSCALL
122 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
123 select HAVE_ARCH_AUDITSYSCALL
124 select HAVE_ARCH_EARLY_PFN_TO_NID
125 select HAVE_ARCH_JUMP_LABEL
126 select HAVE_ARCH_SECCOMP_FILTER
127 select HAVE_ARCH_SOFT_DIRTY
128 select HAVE_ARCH_TRACEHOOK
129 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
130 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
131 select HAVE_CMPXCHG_DOUBLE
132 select HAVE_CMPXCHG_LOCAL
133 select HAVE_DEBUG_KMEMLEAK
134 select HAVE_DMA_API_DEBUG
135 select HAVE_DYNAMIC_FTRACE
136 select HAVE_DYNAMIC_FTRACE_WITH_REGS
137 select HAVE_FTRACE_MCOUNT_RECORD
138 select HAVE_FUNCTION_GRAPH_TRACER
139 select HAVE_FUNCTION_TRACER
140 select HAVE_FUTEX_CMPXCHG if FUTEX
141 select HAVE_KERNEL_BZIP2
142 select HAVE_KERNEL_GZIP
143 select HAVE_KERNEL_LZ4
144 select HAVE_KERNEL_LZMA
145 select HAVE_KERNEL_LZO
146 select HAVE_KERNEL_XZ
148 select HAVE_KRETPROBES
150 select HAVE_LIVEPATCH
152 select HAVE_MEMBLOCK_NODE_MAP
153 select HAVE_MEMBLOCK_PHYS_MAP
154 select HAVE_MOD_ARCH_SPECIFIC
156 select HAVE_PERF_EVENTS
157 select HAVE_REGS_AND_STACK_ACCESS_API
158 select HAVE_SYSCALL_TRACEPOINTS
159 select HAVE_VIRT_CPU_ACCOUNTING
160 select MODULES_USE_ELF_RELA
163 select OLD_SIGSUSPEND3
164 select SYSCTL_EXCEPTION_TRACE
166 select VIRT_CPU_ACCOUNTING
170 config SCHED_OMIT_FRAME_POINTER
173 config PGTABLE_LEVELS
177 source "init/Kconfig"
179 source "kernel/Kconfig.freezer"
181 source "kernel/livepatch/Kconfig"
183 menu "Processor type and features"
185 config HAVE_MARCH_Z900_FEATURES
188 config HAVE_MARCH_Z990_FEATURES
190 select HAVE_MARCH_Z900_FEATURES
192 config HAVE_MARCH_Z9_109_FEATURES
194 select HAVE_MARCH_Z990_FEATURES
196 config HAVE_MARCH_Z10_FEATURES
198 select HAVE_MARCH_Z9_109_FEATURES
200 config HAVE_MARCH_Z196_FEATURES
202 select HAVE_MARCH_Z10_FEATURES
204 config HAVE_MARCH_ZEC12_FEATURES
206 select HAVE_MARCH_Z196_FEATURES
208 config HAVE_MARCH_Z13_FEATURES
210 select HAVE_MARCH_ZEC12_FEATURES
213 prompt "Processor type"
217 bool "IBM zSeries model z800 and z900"
218 select HAVE_MARCH_Z900_FEATURES
220 Select this to enable optimizations for model z800/z900 (2064 and
221 2066 series). This will enable some optimizations that are not
222 available on older ESA/390 (31 Bit) only CPUs.
225 bool "IBM zSeries model z890 and z990"
226 select HAVE_MARCH_Z990_FEATURES
228 Select this to enable optimizations for model z890/z990 (2084 and
229 2086 series). The kernel will be slightly faster but will not work
234 select HAVE_MARCH_Z9_109_FEATURES
236 Select this to enable optimizations for IBM System z9 (2094 and
237 2096 series). The kernel will be slightly faster but will not work
241 bool "IBM System z10"
242 select HAVE_MARCH_Z10_FEATURES
244 Select this to enable optimizations for IBM System z10 (2097 and
245 2098 series). The kernel will be slightly faster but will not work
249 bool "IBM zEnterprise 114 and 196"
250 select HAVE_MARCH_Z196_FEATURES
252 Select this to enable optimizations for IBM zEnterprise 114 and 196
253 (2818 and 2817 series). The kernel will be slightly faster but will
254 not work on older machines.
257 bool "IBM zBC12 and zEC12"
258 select HAVE_MARCH_ZEC12_FEATURES
260 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
261 2827 series). The kernel will be slightly faster but will not work on
265 bool "IBM z13s and z13"
266 select HAVE_MARCH_Z13_FEATURES
268 Select this to enable optimizations for IBM z13s and z13 (2965 and
269 2964 series). The kernel will be slightly faster but will not work on
274 config MARCH_Z900_TUNE
275 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
277 config MARCH_Z990_TUNE
278 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
280 config MARCH_Z9_109_TUNE
281 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
283 config MARCH_Z10_TUNE
284 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
286 config MARCH_Z196_TUNE
287 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
289 config MARCH_ZEC12_TUNE
290 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
292 config MARCH_Z13_TUNE
293 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
296 prompt "Tune code generation"
299 Cause the compiler to tune (-mtune) the generated code for a machine.
300 This will make the code run faster on the selected machine but
301 somewhat slower on other machines.
302 This option only changes how the compiler emits instructions, not the
303 selection of instructions itself, so the resulting kernel will run on
309 Tune the generated code for the target processor for which the kernel
313 bool "IBM zSeries model z800 and z900"
316 bool "IBM zSeries model z890 and z990"
322 bool "IBM System z10"
325 bool "IBM zEnterprise 114 and 196"
328 bool "IBM zBC12 and zEC12"
340 prompt "Kernel support for 31 bit emulation"
341 select COMPAT_BINFMT_ELF if BINFMT_ELF
342 select ARCH_WANT_OLD_COMPAT_IPC
343 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 (2-512)"
382 This allows you to specify the maximum number of CPUs which this
383 kernel will support. The maximum supported value is 512 and the
384 minimum value which makes sense is 2.
386 This is purely to save memory - each supported CPU adds
387 approximately sixteen kilobytes to the kernel image.
391 prompt "Support for hot-pluggable CPUs"
394 Say Y here to be able to turn CPUs off and on. CPUs
395 can be controlled through /sys/devices/system/cpu/cpu#.
396 Say N if you want to disable CPU hotplug.
398 # Some NUMA nodes have memory ranges that span
399 # other nodes. Even though a pfn is valid and
400 # between a node's start and end pfns, it may not
401 # reside on that node. See memmap_init_zone()
402 # for details. <- They meant memory holes!
403 config NODES_SPAN_OTHER_NODES
408 depends on SMP && SCHED_TOPOLOGY
413 This option adds NUMA support to the kernel.
415 An operation mode can be selected by appending
416 numa=<method> to the kernel command line.
418 The default behaviour is identical to appending numa=plain to
419 the command line. This will create just one node with all
420 available memory and all CPUs in it.
423 int "Maximum NUMA nodes (as a power of 2)"
428 Specify the maximum number of NUMA nodes available on the target
429 system. Increases memory reserved to accommodate various tables.
431 menu "Select NUMA modes"
435 bool "NUMA emulation"
438 Numa emulation mode will split the available system memory into
439 equal chunks which then are distributed over the configured number
440 of nodes in a round-robin manner.
442 The number of fake nodes is limited by the number of available memory
443 chunks (i.e. memory size / fake size) and the number of supported
446 The CPUs are assigned to the nodes in a way that partially respects
447 the original machine topology (if supported by the machine).
448 Fair distribution of the CPUs is not guaranteed.
451 hex "NUMA emulation memory chunk size"
453 range 0x400000 0x100000000
456 Select the default size by which the memory is chopped and then
457 assigned to emulated NUMA nodes.
459 This can be overridden by specifying
463 on the kernel command line where also suffixes K, M, G, and T are
477 config SCHED_TOPOLOGY
479 prompt "Topology scheduler support"
485 Topology scheduler support improves the CPU scheduler's decision
486 making when dealing with machines that have multi-threading,
487 multiple cores or multiple books.
489 source kernel/Kconfig.preempt
491 source kernel/Kconfig.hz
497 config ARCH_SPARSEMEM_ENABLE
499 select SPARSEMEM_VMEMMAP_ENABLE
500 select SPARSEMEM_VMEMMAP
502 config ARCH_SPARSEMEM_DEFAULT
505 config ARCH_SELECT_MEMORY_MODEL
508 config ARCH_ENABLE_MEMORY_HOTPLUG
509 def_bool y if SPARSEMEM
511 config ARCH_ENABLE_MEMORY_HOTREMOVE
514 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
517 config FORCE_MAX_ZONEORDER
525 prompt "Pack kernel stack"
527 This option enables the compiler option -mkernel-backchain if it
528 is available. If the option is available the compiler supports
529 the new stack layout which dramatically reduces the minimum stack
530 frame size. With an old compiler a non-leaf function needs a
531 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
532 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
533 and 24 byte on 64 bit.
535 Say Y if you are unsure.
539 prompt "Detect kernel stack overflow"
541 This option enables the compiler option -mstack-guard and
542 -mstack-size if they are available. If the compiler supports them
543 it will emit additional code to each function prolog to trigger
544 an illegal operation if the kernel stack is about to overflow.
546 Say N if you are unsure.
549 int "Size of the guard area (128-1024)"
551 depends on CHECK_STACK
554 This allows you to specify the size of the guard area at the lower
555 end of the kernel stack. If the kernel stack points into the guard
556 area on function entry an illegal operation is triggered. The size
557 needs to be a power of 2. Please keep in mind that the size of an
558 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
559 The minimum size for the stack guard should be 256 for 31 bit and
562 config WARN_DYNAMIC_STACK
564 prompt "Emit compiler warnings for function with dynamic stack usage"
566 This option enables the compiler option -mwarn-dynamicstack. If the
567 compiler supports this options generates warnings for functions
568 that dynamically allocate stack space using alloca.
570 Say N if you are unsure.
578 prompt "QDIO support"
580 This driver provides the Queued Direct I/O base support for
583 To compile this driver as a module, choose M here: the
584 module will be called qdio.
597 config PCI_NR_FUNCTIONS
598 int "Maximum number of PCI functions (1-4096)"
602 This allows you to specify the maximum number of PCI functions which
603 this kernel will support.
606 int "Maximum number of MSI interrupts (64-32768)"
610 This defines the number of virtual interrupts the kernel will
611 provide for MSI interrupts. If you configure your system to have
612 too few drivers will fail to allocate MSI interrupts for all
615 source "drivers/pci/Kconfig"
628 config NEED_SG_DMA_LENGTH
631 config NEED_DMA_MAP_STATE
636 prompt "Support for CHSC subchannels"
638 This driver allows usage of CHSC subchannels. A CHSC subchannel
639 is usually present on LPAR only.
640 The driver creates a device /dev/chsc, which may be used to
641 obtain I/O configuration information about the machine and
642 to issue asynchronous chsc commands (DANGEROUS).
643 You will usually only want to use this interface on a special
644 LPAR designated for system management.
646 To compile this driver as a module, choose M here: the
647 module will be called chsc_sch.
653 prompt "SCM bus driver"
655 Bus driver for Storage Class Memory.
659 prompt "Support for EADM subchannels"
662 This driver allows usage of EADM subchannels. EADM subchannels act
663 as a communication vehicle for SCM increments.
665 To compile this driver as a module, choose M here: the
666 module will be called eadm_sch.
673 bool "kernel crash dumps"
677 Generate crash dump after being started by kexec.
678 Crash dump kernels are loaded in the main kernel with kexec-tools
679 into a specially reserved region and then later executed after
680 a crash by kdump/kexec.
681 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
682 This option also enables s390 zfcpdump.
683 See also <file:Documentation/s390/zfcpdump.txt>
687 menu "Executable file formats / Emulations"
689 source "fs/Kconfig.binfmt"
693 prompt "Enable seccomp to safely compute untrusted bytecode"
696 This kernel feature is useful for number crunching applications
697 that may need to compute untrusted bytecode during their
698 execution. By using pipes or other transports made available to
699 the process as file descriptors supporting the read/write
700 syscalls, it's possible to isolate those applications in
701 their own address space using seccomp. Once seccomp is
702 enabled via /proc/<pid>/seccomp, it cannot be disabled
703 and the task is only allowed to execute a few safe syscalls
704 defined by each seccomp mode.
710 menu "Power Management"
712 config ARCH_HIBERNATION_POSSIBLE
715 source "kernel/power/Kconfig"
727 source "drivers/Kconfig"
731 source "arch/s390/Kconfig.debug"
733 source "security/Kconfig"
735 source "crypto/Kconfig"
739 menu "Virtualization"
743 prompt "Pseudo page fault support"
745 Select this option, if you want to use PFAULT pseudo page fault
746 handling under VM. If running native or in LPAR, this option
747 has no effect. If your VM does not support PFAULT, PAGEEX
748 pseudo page fault handling will be used.
749 Note that VM 4.2 supports PFAULT but has a bug in its
750 implementation that causes some problems.
751 Everybody who wants to run Linux under VM != VM4.2 should select
755 bool "VM shared kernel support"
756 depends on !JUMP_LABEL
758 Select this option, if you want to share the text segment of the
759 Linux kernel between different VM guests. This reduces memory
760 usage with lots of guests but greatly increases kernel size.
761 Also if a kernel was IPL'ed from a shared segment the kexec system
763 You should only select this option if you know what you are
764 doing and want to exploit this feature.
768 prompt "Cooperative memory management"
770 Select this option, if you want to enable the kernel interface
771 to reduce the memory size of the system. This is accomplished
772 by allocating pages of memory and put them "on hold". This only
773 makes sense for a system running under VM where the unused pages
774 will be reused by VM for other guest systems. The interface
775 allows an external monitor to balance memory of many systems.
776 Everybody who wants to run Linux under VM should select this
781 prompt "IUCV special message interface to cooperative memory management"
782 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
784 Select this option to enable the special message interface to
785 the cooperative memory management.
789 prompt "Linux - VM Monitor Stream, base infrastructure"
792 This provides a kernel interface for creating and updating z/VM APPLDATA
793 monitor records. The monitor records are updated at certain time
794 intervals, once the timer is started.
795 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
796 i.e. enables or disables monitoring on the Linux side.
797 A custom interval value (in seconds) can be written to
798 /proc/appldata/interval.
800 Defaults are 60 seconds interval and timer off.
801 The /proc entries can also be read from, showing the current settings.
805 prompt "Monitor memory management statistics"
806 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
808 This provides memory management related data to the Linux - VM Monitor
809 Stream, like paging/swapping rate, memory utilisation, etc.
810 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
811 APPLDATA monitor record, i.e. enables or disables monitoring this record
815 The /proc entry can also be read from, showing the current settings.
817 This can also be compiled as a module, which will be called
822 prompt "Monitor OS statistics"
823 depends on APPLDATA_BASE
825 This provides OS related data to the Linux - VM Monitor Stream, like
826 CPU utilisation, etc.
827 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
828 APPLDATA monitor record, i.e. enables or disables monitoring this record
832 This can also be compiled as a module, which will be called
835 config APPLDATA_NET_SUM
837 prompt "Monitor overall network statistics"
838 depends on APPLDATA_BASE && NET
840 This provides network related data to the Linux - VM Monitor Stream,
841 currently there is only a total sum of network I/O statistics, no
843 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
844 APPLDATA monitor record, i.e. enables or disables monitoring this record
848 This can also be compiled as a module, which will be called
853 prompt "s390 hypervisor file system support"
854 select SYS_HYPERVISOR
856 This is a virtual file system intended to provide accounting
857 information in an s390 hypervisor environment.
859 source "arch/s390/kvm/Kconfig"
863 prompt "s390 support for virtio devices"
865 select VIRTUALIZATION
867 select VIRTIO_CONSOLE
869 Enabling this option adds support for virtio based paravirtual device
872 Select this option if you want to run the kernel as a guest under