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 CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
127 select HAVE_ARCH_SECCOMP_FILTER
128 select HAVE_ARCH_SOFT_DIRTY
129 select HAVE_ARCH_TRACEHOOK
130 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
131 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
132 select HAVE_CMPXCHG_DOUBLE
133 select HAVE_CMPXCHG_LOCAL
134 select HAVE_DEBUG_KMEMLEAK
135 select HAVE_DMA_API_DEBUG
136 select HAVE_DYNAMIC_FTRACE
137 select HAVE_DYNAMIC_FTRACE_WITH_REGS
138 select HAVE_EXIT_THREAD
139 select HAVE_FTRACE_MCOUNT_RECORD
140 select HAVE_FUNCTION_GRAPH_TRACER
141 select HAVE_FUNCTION_TRACER
142 select HAVE_FUTEX_CMPXCHG if FUTEX
143 select HAVE_KERNEL_BZIP2
144 select HAVE_KERNEL_GZIP
145 select HAVE_KERNEL_LZ4
146 select HAVE_KERNEL_LZMA
147 select HAVE_KERNEL_LZO
148 select HAVE_KERNEL_XZ
150 select HAVE_KRETPROBES
152 select HAVE_LIVEPATCH
154 select HAVE_MEMBLOCK_NODE_MAP
155 select HAVE_MEMBLOCK_PHYS_MAP
156 select HAVE_MOD_ARCH_SPECIFIC
158 select HAVE_PERF_EVENTS
159 select HAVE_REGS_AND_STACK_ACCESS_API
160 select HAVE_SYSCALL_TRACEPOINTS
161 select HAVE_VIRT_CPU_ACCOUNTING
162 select MODULES_USE_ELF_RELA
165 select OLD_SIGSUSPEND3
166 select SYSCTL_EXCEPTION_TRACE
168 select VIRT_CPU_ACCOUNTING
173 config SCHED_OMIT_FRAME_POINTER
176 config PGTABLE_LEVELS
180 source "init/Kconfig"
182 source "kernel/Kconfig.freezer"
184 source "kernel/livepatch/Kconfig"
186 menu "Processor type and features"
188 config HAVE_MARCH_Z900_FEATURES
191 config HAVE_MARCH_Z990_FEATURES
193 select HAVE_MARCH_Z900_FEATURES
195 config HAVE_MARCH_Z9_109_FEATURES
197 select HAVE_MARCH_Z990_FEATURES
199 config HAVE_MARCH_Z10_FEATURES
201 select HAVE_MARCH_Z9_109_FEATURES
203 config HAVE_MARCH_Z196_FEATURES
205 select HAVE_MARCH_Z10_FEATURES
207 config HAVE_MARCH_ZEC12_FEATURES
209 select HAVE_MARCH_Z196_FEATURES
211 config HAVE_MARCH_Z13_FEATURES
213 select HAVE_MARCH_ZEC12_FEATURES
216 prompt "Processor type"
220 bool "IBM zSeries model z800 and z900"
221 select HAVE_MARCH_Z900_FEATURES
223 Select this to enable optimizations for model z800/z900 (2064 and
224 2066 series). This will enable some optimizations that are not
225 available on older ESA/390 (31 Bit) only CPUs.
228 bool "IBM zSeries model z890 and z990"
229 select HAVE_MARCH_Z990_FEATURES
231 Select this to enable optimizations for model z890/z990 (2084 and
232 2086 series). The kernel will be slightly faster but will not work
237 select HAVE_MARCH_Z9_109_FEATURES
239 Select this to enable optimizations for IBM System z9 (2094 and
240 2096 series). The kernel will be slightly faster but will not work
244 bool "IBM System z10"
245 select HAVE_MARCH_Z10_FEATURES
247 Select this to enable optimizations for IBM System z10 (2097 and
248 2098 series). The kernel will be slightly faster but will not work
252 bool "IBM zEnterprise 114 and 196"
253 select HAVE_MARCH_Z196_FEATURES
255 Select this to enable optimizations for IBM zEnterprise 114 and 196
256 (2818 and 2817 series). The kernel will be slightly faster but will
257 not work on older machines.
260 bool "IBM zBC12 and zEC12"
261 select HAVE_MARCH_ZEC12_FEATURES
263 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
264 2827 series). The kernel will be slightly faster but will not work on
268 bool "IBM z13s and z13"
269 select HAVE_MARCH_Z13_FEATURES
271 Select this to enable optimizations for IBM z13s and z13 (2965 and
272 2964 series). The kernel will be slightly faster but will not work on
277 config MARCH_Z900_TUNE
278 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
280 config MARCH_Z990_TUNE
281 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
283 config MARCH_Z9_109_TUNE
284 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
286 config MARCH_Z10_TUNE
287 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
289 config MARCH_Z196_TUNE
290 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
292 config MARCH_ZEC12_TUNE
293 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
295 config MARCH_Z13_TUNE
296 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
299 prompt "Tune code generation"
302 Cause the compiler to tune (-mtune) the generated code for a machine.
303 This will make the code run faster on the selected machine but
304 somewhat slower on other machines.
305 This option only changes how the compiler emits instructions, not the
306 selection of instructions itself, so the resulting kernel will run on
312 Tune the generated code for the target processor for which the kernel
316 bool "IBM zSeries model z800 and z900"
319 bool "IBM zSeries model z890 and z990"
325 bool "IBM System z10"
328 bool "IBM zEnterprise 114 and 196"
331 bool "IBM zBC12 and zEC12"
343 prompt "Kernel support for 31 bit emulation"
344 select COMPAT_BINFMT_ELF if BINFMT_ELF
345 select ARCH_WANT_OLD_COMPAT_IPC
346 select COMPAT_OLD_SIGACTION
349 Select this option if you want to enable your system kernel to
350 handle system-calls from ELF binaries for 31 bit ESA. This option
351 (and some other stuff like libraries and such) is needed for
352 executing 31 bit applications. It is safe to say "Y".
354 config SYSVIPC_COMPAT
355 def_bool y if COMPAT && SYSVIPC
358 def_bool y if COMPAT && KEYS
362 prompt "Symmetric multi-processing support"
364 This enables support for systems with more than one CPU. If you have
365 a system with only one CPU, like most personal computers, say N. If
366 you have a system with more than one CPU, say Y.
368 If you say N here, the kernel will run on uni- and multiprocessor
369 machines, but will use only one CPU of a multiprocessor machine. If
370 you say Y here, the kernel will run on many, but not all,
371 uniprocessor machines. On a uniprocessor machine, the kernel
372 will run faster if you say N here.
374 See also the SMP-HOWTO available at
375 <http://www.tldp.org/docs.html#howto>.
377 Even if you don't know what to do here, say Y.
380 int "Maximum number of CPUs (2-512)"
385 This allows you to specify the maximum number of CPUs which this
386 kernel will support. The maximum supported value is 512 and the
387 minimum value which makes sense is 2.
389 This is purely to save memory - each supported CPU adds
390 approximately sixteen kilobytes to the kernel image.
394 prompt "Support for hot-pluggable CPUs"
397 Say Y here to be able to turn CPUs off and on. CPUs
398 can be controlled through /sys/devices/system/cpu/cpu#.
399 Say N if you want to disable CPU hotplug.
401 # Some NUMA nodes have memory ranges that span
402 # other nodes. Even though a pfn is valid and
403 # between a node's start and end pfns, it may not
404 # reside on that node. See memmap_init_zone()
405 # for details. <- They meant memory holes!
406 config NODES_SPAN_OTHER_NODES
411 depends on SMP && SCHED_TOPOLOGY
416 This option adds NUMA support to the kernel.
418 An operation mode can be selected by appending
419 numa=<method> to the kernel command line.
421 The default behaviour is identical to appending numa=plain to
422 the command line. This will create just one node with all
423 available memory and all CPUs in it.
426 int "Maximum NUMA nodes (as a power of 2)"
431 Specify the maximum number of NUMA nodes available on the target
432 system. Increases memory reserved to accommodate various tables.
434 menu "Select NUMA modes"
438 bool "NUMA emulation"
441 Numa emulation mode will split the available system memory into
442 equal chunks which then are distributed over the configured number
443 of nodes in a round-robin manner.
445 The number of fake nodes is limited by the number of available memory
446 chunks (i.e. memory size / fake size) and the number of supported
449 The CPUs are assigned to the nodes in a way that partially respects
450 the original machine topology (if supported by the machine).
451 Fair distribution of the CPUs is not guaranteed.
454 hex "NUMA emulation memory chunk size"
456 range 0x400000 0x100000000
459 Select the default size by which the memory is chopped and then
460 assigned to emulated NUMA nodes.
462 This can be overridden by specifying
466 on the kernel command line where also suffixes K, M, G, and T are
480 config SCHED_TOPOLOGY
482 prompt "Topology scheduler support"
488 Topology scheduler support improves the CPU scheduler's decision
489 making when dealing with machines that have multi-threading,
490 multiple cores or multiple books.
492 source kernel/Kconfig.preempt
494 source kernel/Kconfig.hz
500 config ARCH_SPARSEMEM_ENABLE
502 select SPARSEMEM_VMEMMAP_ENABLE
503 select SPARSEMEM_VMEMMAP
505 config ARCH_SPARSEMEM_DEFAULT
508 config ARCH_SELECT_MEMORY_MODEL
511 config ARCH_ENABLE_MEMORY_HOTPLUG
512 def_bool y if SPARSEMEM
514 config ARCH_ENABLE_MEMORY_HOTREMOVE
517 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
520 config FORCE_MAX_ZONEORDER
528 prompt "Pack kernel stack"
530 This option enables the compiler option -mkernel-backchain if it
531 is available. If the option is available the compiler supports
532 the new stack layout which dramatically reduces the minimum stack
533 frame size. With an old compiler a non-leaf function needs a
534 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
535 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
536 and 24 byte on 64 bit.
538 Say Y if you are unsure.
542 prompt "Detect kernel stack overflow"
544 This option enables the compiler option -mstack-guard and
545 -mstack-size if they are available. If the compiler supports them
546 it will emit additional code to each function prolog to trigger
547 an illegal operation if the kernel stack is about to overflow.
549 Say N if you are unsure.
552 int "Size of the guard area (128-1024)"
554 depends on CHECK_STACK
557 This allows you to specify the size of the guard area at the lower
558 end of the kernel stack. If the kernel stack points into the guard
559 area on function entry an illegal operation is triggered. The size
560 needs to be a power of 2. Please keep in mind that the size of an
561 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
562 The minimum size for the stack guard should be 256 for 31 bit and
565 config WARN_DYNAMIC_STACK
567 prompt "Emit compiler warnings for function with dynamic stack usage"
569 This option enables the compiler option -mwarn-dynamicstack. If the
570 compiler supports this options generates warnings for functions
571 that dynamically allocate stack space using alloca.
573 Say N if you are unsure.
581 prompt "QDIO support"
583 This driver provides the Queued Direct I/O base support for
586 To compile this driver as a module, choose M here: the
587 module will be called qdio.
600 config PCI_NR_FUNCTIONS
601 int "Maximum number of PCI functions (1-4096)"
605 This allows you to specify the maximum number of PCI functions which
606 this kernel will support.
609 int "Maximum number of MSI interrupts (64-32768)"
613 This defines the number of virtual interrupts the kernel will
614 provide for MSI interrupts. If you configure your system to have
615 too few drivers will fail to allocate MSI interrupts for all
618 source "drivers/pci/Kconfig"
631 config NEED_SG_DMA_LENGTH
634 config NEED_DMA_MAP_STATE
639 prompt "Support for CHSC subchannels"
641 This driver allows usage of CHSC subchannels. A CHSC subchannel
642 is usually present on LPAR only.
643 The driver creates a device /dev/chsc, which may be used to
644 obtain I/O configuration information about the machine and
645 to issue asynchronous chsc commands (DANGEROUS).
646 You will usually only want to use this interface on a special
647 LPAR designated for system management.
649 To compile this driver as a module, choose M here: the
650 module will be called chsc_sch.
656 prompt "SCM bus driver"
658 Bus driver for Storage Class Memory.
662 prompt "Support for EADM subchannels"
665 This driver allows usage of EADM subchannels. EADM subchannels act
666 as a communication vehicle for SCM increments.
668 To compile this driver as a module, choose M here: the
669 module will be called eadm_sch.
676 bool "kernel crash dumps"
680 Generate crash dump after being started by kexec.
681 Crash dump kernels are loaded in the main kernel with kexec-tools
682 into a specially reserved region and then later executed after
683 a crash by kdump/kexec.
684 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
685 This option also enables s390 zfcpdump.
686 See also <file:Documentation/s390/zfcpdump.txt>
690 menu "Executable file formats / Emulations"
692 source "fs/Kconfig.binfmt"
696 prompt "Enable seccomp to safely compute untrusted bytecode"
699 This kernel feature is useful for number crunching applications
700 that may need to compute untrusted bytecode during their
701 execution. By using pipes or other transports made available to
702 the process as file descriptors supporting the read/write
703 syscalls, it's possible to isolate those applications in
704 their own address space using seccomp. Once seccomp is
705 enabled via /proc/<pid>/seccomp, it cannot be disabled
706 and the task is only allowed to execute a few safe syscalls
707 defined by each seccomp mode.
713 menu "Power Management"
715 config ARCH_HIBERNATION_POSSIBLE
718 source "kernel/power/Kconfig"
730 source "drivers/Kconfig"
734 source "arch/s390/Kconfig.debug"
736 source "security/Kconfig"
738 source "crypto/Kconfig"
742 menu "Virtualization"
746 prompt "Pseudo page fault support"
748 Select this option, if you want to use PFAULT pseudo page fault
749 handling under VM. If running native or in LPAR, this option
750 has no effect. If your VM does not support PFAULT, PAGEEX
751 pseudo page fault handling will be used.
752 Note that VM 4.2 supports PFAULT but has a bug in its
753 implementation that causes some problems.
754 Everybody who wants to run Linux under VM != VM4.2 should select
758 bool "VM shared kernel support"
759 depends on !JUMP_LABEL
761 Select this option, if you want to share the text segment of the
762 Linux kernel between different VM guests. This reduces memory
763 usage with lots of guests but greatly increases kernel size.
764 Also if a kernel was IPL'ed from a shared segment the kexec system
766 You should only select this option if you know what you are
767 doing and want to exploit this feature.
771 prompt "Cooperative memory management"
773 Select this option, if you want to enable the kernel interface
774 to reduce the memory size of the system. This is accomplished
775 by allocating pages of memory and put them "on hold". This only
776 makes sense for a system running under VM where the unused pages
777 will be reused by VM for other guest systems. The interface
778 allows an external monitor to balance memory of many systems.
779 Everybody who wants to run Linux under VM should select this
784 prompt "IUCV special message interface to cooperative memory management"
785 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
787 Select this option to enable the special message interface to
788 the cooperative memory management.
792 prompt "Linux - VM Monitor Stream, base infrastructure"
795 This provides a kernel interface for creating and updating z/VM APPLDATA
796 monitor records. The monitor records are updated at certain time
797 intervals, once the timer is started.
798 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
799 i.e. enables or disables monitoring on the Linux side.
800 A custom interval value (in seconds) can be written to
801 /proc/appldata/interval.
803 Defaults are 60 seconds interval and timer off.
804 The /proc entries can also be read from, showing the current settings.
808 prompt "Monitor memory management statistics"
809 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
811 This provides memory management related data to the Linux - VM Monitor
812 Stream, like paging/swapping rate, memory utilisation, etc.
813 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
814 APPLDATA monitor record, i.e. enables or disables monitoring this record
818 The /proc entry can also be read from, showing the current settings.
820 This can also be compiled as a module, which will be called
825 prompt "Monitor OS statistics"
826 depends on APPLDATA_BASE
828 This provides OS related data to the Linux - VM Monitor Stream, like
829 CPU utilisation, etc.
830 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
831 APPLDATA monitor record, i.e. enables or disables monitoring this record
835 This can also be compiled as a module, which will be called
838 config APPLDATA_NET_SUM
840 prompt "Monitor overall network statistics"
841 depends on APPLDATA_BASE && NET
843 This provides network related data to the Linux - VM Monitor Stream,
844 currently there is only a total sum of network I/O statistics, no
846 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
847 APPLDATA monitor record, i.e. enables or disables monitoring this record
851 This can also be compiled as a module, which will be called
856 prompt "s390 hypervisor file system support"
857 select SYS_HYPERVISOR
859 This is a virtual file system intended to provide accounting
860 information in an s390 hypervisor environment.
862 source "arch/s390/kvm/Kconfig"
866 prompt "s390 support for virtio devices"
868 select VIRTUALIZATION
870 select VIRTIO_CONSOLE
872 Enabling this option adds support for virtio based paravirtual device
875 Select this option if you want to run the kernel as a guest under