10 config STACKTRACE_SUPPORT
13 config RWSEM_GENERIC_SPINLOCK
16 config RWSEM_XCHGADD_ALGORITHM
19 config ARCH_HAS_ILOG2_U32
22 config ARCH_HAS_ILOG2_U64
25 config GENERIC_HWEIGHT
31 config GENERIC_BUG_RELATIVE_POINTERS
34 config ARCH_DMA_ADDR_T_64BIT
37 config GENERIC_LOCKBREAK
38 def_bool y if SMP && PREEMPT
43 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
59 config ARCH_SUPPORTS_UPROBES
64 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
65 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
66 select ARCH_HAS_DEVMEM_IS_ALLOWED
67 select ARCH_HAS_ELF_RANDOMIZE
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_SUPPORTS_NUMA_BALANCING
102 select ARCH_USE_BUILTIN_BSWAP
103 select ARCH_USE_CMPXCHG_LOCKREF
104 select ARCH_WANTS_PROT_NUMA_PROT_NONE
105 select ARCH_WANT_IPC_PARSE_VERSION
106 select BUILDTIME_EXTABLE_SORT
107 select CLONE_BACKWARDS2
108 select DYNAMIC_FTRACE if FUNCTION_TRACER
109 select GENERIC_CLOCKEVENTS
110 select GENERIC_CPU_AUTOPROBE
111 select GENERIC_CPU_DEVICES if !SMP
112 select GENERIC_FIND_FIRST_BIT
113 select GENERIC_SMP_IDLE_THREAD
114 select GENERIC_TIME_VSYSCALL
115 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
116 select HAVE_ARCH_AUDITSYSCALL
117 select HAVE_ARCH_EARLY_PFN_TO_NID
118 select HAVE_ARCH_JUMP_LABEL
119 select HAVE_ARCH_SECCOMP_FILTER
120 select HAVE_ARCH_SOFT_DIRTY
121 select HAVE_ARCH_TRACEHOOK
122 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
123 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
124 select HAVE_CMPXCHG_DOUBLE
125 select HAVE_CMPXCHG_LOCAL
126 select HAVE_DEBUG_KMEMLEAK
127 select HAVE_DMA_API_DEBUG
128 select HAVE_DYNAMIC_FTRACE
129 select HAVE_DYNAMIC_FTRACE_WITH_REGS
130 select HAVE_FTRACE_MCOUNT_RECORD
131 select HAVE_FUNCTION_GRAPH_TRACER
132 select HAVE_FUNCTION_TRACER
133 select HAVE_FUTEX_CMPXCHG if FUTEX
134 select HAVE_KERNEL_BZIP2
135 select HAVE_KERNEL_GZIP
136 select HAVE_KERNEL_LZ4
137 select HAVE_KERNEL_LZMA
138 select HAVE_KERNEL_LZO
139 select HAVE_KERNEL_XZ
141 select HAVE_KRETPROBES
143 select HAVE_LIVEPATCH
145 select HAVE_MEMBLOCK_NODE_MAP
146 select HAVE_MEMBLOCK_PHYS_MAP
147 select HAVE_MOD_ARCH_SPECIFIC
149 select HAVE_PERF_EVENTS
150 select HAVE_REGS_AND_STACK_ACCESS_API
151 select HAVE_SYSCALL_TRACEPOINTS
152 select HAVE_VIRT_CPU_ACCOUNTING
153 select MODULES_USE_ELF_RELA
156 select OLD_SIGSUSPEND3
157 select SYSCTL_EXCEPTION_TRACE
159 select VIRT_CPU_ACCOUNTING
163 config SCHED_OMIT_FRAME_POINTER
166 config PGTABLE_LEVELS
170 source "init/Kconfig"
172 source "kernel/Kconfig.freezer"
174 source "kernel/livepatch/Kconfig"
176 menu "Processor type and features"
178 config HAVE_MARCH_Z900_FEATURES
181 config HAVE_MARCH_Z990_FEATURES
183 select HAVE_MARCH_Z900_FEATURES
185 config HAVE_MARCH_Z9_109_FEATURES
187 select HAVE_MARCH_Z990_FEATURES
189 config HAVE_MARCH_Z10_FEATURES
191 select HAVE_MARCH_Z9_109_FEATURES
193 config HAVE_MARCH_Z196_FEATURES
195 select HAVE_MARCH_Z10_FEATURES
197 config HAVE_MARCH_ZEC12_FEATURES
199 select HAVE_MARCH_Z196_FEATURES
201 config HAVE_MARCH_Z13_FEATURES
203 select HAVE_MARCH_ZEC12_FEATURES
206 prompt "Processor type"
210 bool "IBM zSeries model z800 and z900"
211 select HAVE_MARCH_Z900_FEATURES
213 Select this to enable optimizations for model z800/z900 (2064 and
214 2066 series). This will enable some optimizations that are not
215 available on older ESA/390 (31 Bit) only CPUs.
218 bool "IBM zSeries model z890 and z990"
219 select HAVE_MARCH_Z990_FEATURES
221 Select this to enable optimizations for model z890/z990 (2084 and
222 2086 series). The kernel will be slightly faster but will not work
227 select HAVE_MARCH_Z9_109_FEATURES
229 Select this to enable optimizations for IBM System z9 (2094 and
230 2096 series). The kernel will be slightly faster but will not work
234 bool "IBM System z10"
235 select HAVE_MARCH_Z10_FEATURES
237 Select this to enable optimizations for IBM System z10 (2097 and
238 2098 series). The kernel will be slightly faster but will not work
242 bool "IBM zEnterprise 114 and 196"
243 select HAVE_MARCH_Z196_FEATURES
245 Select this to enable optimizations for IBM zEnterprise 114 and 196
246 (2818 and 2817 series). The kernel will be slightly faster but will
247 not work on older machines.
250 bool "IBM zBC12 and zEC12"
251 select HAVE_MARCH_ZEC12_FEATURES
253 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
254 2827 series). The kernel will be slightly faster but will not work on
258 bool "IBM z13s and z13"
259 select HAVE_MARCH_Z13_FEATURES
261 Select this to enable optimizations for IBM z13s and z13 (2965 and
262 2964 series). The kernel will be slightly faster but will not work on
267 config MARCH_Z900_TUNE
268 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
270 config MARCH_Z990_TUNE
271 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
273 config MARCH_Z9_109_TUNE
274 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
276 config MARCH_Z10_TUNE
277 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
279 config MARCH_Z196_TUNE
280 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
282 config MARCH_ZEC12_TUNE
283 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
285 config MARCH_Z13_TUNE
286 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
289 prompt "Tune code generation"
292 Cause the compiler to tune (-mtune) the generated code for a machine.
293 This will make the code run faster on the selected machine but
294 somewhat slower on other machines.
295 This option only changes how the compiler emits instructions, not the
296 selection of instructions itself, so the resulting kernel will run on
302 Tune the generated code for the target processor for which the kernel
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"
333 prompt "Kernel support for 31 bit emulation"
334 select COMPAT_BINFMT_ELF if BINFMT_ELF
335 select ARCH_WANT_OLD_COMPAT_IPC
336 select COMPAT_OLD_SIGACTION
339 Select this option if you want to enable your system kernel to
340 handle system-calls from ELF binaries for 31 bit ESA. This option
341 (and some other stuff like libraries and such) is needed for
342 executing 31 bit applications. It is safe to say "Y".
344 config SYSVIPC_COMPAT
345 def_bool y if COMPAT && SYSVIPC
348 def_bool y if COMPAT && KEYS
352 prompt "Symmetric multi-processing support"
354 This enables support for systems with more than one CPU. If you have
355 a system with only one CPU, like most personal computers, say N. If
356 you have a system with more than one CPU, say Y.
358 If you say N here, the kernel will run on uni- and multiprocessor
359 machines, but will use only one CPU of a multiprocessor machine. If
360 you say Y here, the kernel will run on many, but not all,
361 uniprocessor machines. On a uniprocessor machine, the kernel
362 will run faster if you say N here.
364 See also the SMP-HOWTO available at
365 <http://www.tldp.org/docs.html#howto>.
367 Even if you don't know what to do here, say Y.
370 int "Maximum number of CPUs (2-512)"
375 This allows you to specify the maximum number of CPUs which this
376 kernel will support. The maximum supported value is 512 and the
377 minimum value which makes sense is 2.
379 This is purely to save memory - each supported CPU adds
380 approximately sixteen kilobytes to the kernel image.
384 prompt "Support for hot-pluggable CPUs"
387 Say Y here to be able to turn CPUs off and on. CPUs
388 can be controlled through /sys/devices/system/cpu/cpu#.
389 Say N if you want to disable CPU hotplug.
391 # Some NUMA nodes have memory ranges that span
392 # other nodes. Even though a pfn is valid and
393 # between a node's start and end pfns, it may not
394 # reside on that node. See memmap_init_zone()
395 # for details. <- They meant memory holes!
396 config NODES_SPAN_OTHER_NODES
401 depends on SMP && SCHED_TOPOLOGY
406 This option adds NUMA support to the kernel.
408 An operation mode can be selected by appending
409 numa=<method> to the kernel command line.
411 The default behaviour is identical to appending numa=plain to
412 the command line. This will create just one node with all
413 available memory and all CPUs in it.
416 int "Maximum NUMA nodes (as a power of 2)"
421 Specify the maximum number of NUMA nodes available on the target
422 system. Increases memory reserved to accommodate various tables.
424 menu "Select NUMA modes"
428 bool "NUMA emulation"
431 Numa emulation mode will split the available system memory into
432 equal chunks which then are distributed over the configured number
433 of nodes in a round-robin manner.
435 The number of fake nodes is limited by the number of available memory
436 chunks (i.e. memory size / fake size) and the number of supported
439 The CPUs are assigned to the nodes in a way that partially respects
440 the original machine topology (if supported by the machine).
441 Fair distribution of the CPUs is not guaranteed.
444 hex "NUMA emulation memory chunk size"
446 range 0x400000 0x100000000
449 Select the default size by which the memory is chopped and then
450 assigned to emulated NUMA nodes.
452 This can be overridden by specifying
456 on the kernel command line where also suffixes K, M, G, and T are
470 config SCHED_TOPOLOGY
472 prompt "Topology scheduler support"
478 Topology scheduler support improves the CPU scheduler's decision
479 making when dealing with machines that have multi-threading,
480 multiple cores or multiple books.
482 source kernel/Kconfig.preempt
484 source kernel/Kconfig.hz
490 config ARCH_SPARSEMEM_ENABLE
492 select SPARSEMEM_VMEMMAP_ENABLE
493 select SPARSEMEM_VMEMMAP
495 config ARCH_SPARSEMEM_DEFAULT
498 config ARCH_SELECT_MEMORY_MODEL
501 config ARCH_ENABLE_MEMORY_HOTPLUG
502 def_bool y if SPARSEMEM
504 config ARCH_ENABLE_MEMORY_HOTREMOVE
507 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
510 config FORCE_MAX_ZONEORDER
518 prompt "Pack kernel stack"
520 This option enables the compiler option -mkernel-backchain if it
521 is available. If the option is available the compiler supports
522 the new stack layout which dramatically reduces the minimum stack
523 frame size. With an old compiler a non-leaf function needs a
524 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
525 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
526 and 24 byte on 64 bit.
528 Say Y if you are unsure.
532 prompt "Detect kernel stack overflow"
534 This option enables the compiler option -mstack-guard and
535 -mstack-size if they are available. If the compiler supports them
536 it will emit additional code to each function prolog to trigger
537 an illegal operation if the kernel stack is about to overflow.
539 Say N if you are unsure.
542 int "Size of the guard area (128-1024)"
544 depends on CHECK_STACK
547 This allows you to specify the size of the guard area at the lower
548 end of the kernel stack. If the kernel stack points into the guard
549 area on function entry an illegal operation is triggered. The size
550 needs to be a power of 2. Please keep in mind that the size of an
551 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
552 The minimum size for the stack guard should be 256 for 31 bit and
555 config WARN_DYNAMIC_STACK
557 prompt "Emit compiler warnings for function with dynamic stack usage"
559 This option enables the compiler option -mwarn-dynamicstack. If the
560 compiler supports this options generates warnings for functions
561 that dynamically allocate stack space using alloca.
563 Say N if you are unsure.
571 prompt "QDIO support"
573 This driver provides the Queued Direct I/O base support for
576 To compile this driver as a module, choose M here: the
577 module will be called qdio.
590 config PCI_NR_FUNCTIONS
591 int "Maximum number of PCI functions (1-4096)"
595 This allows you to specify the maximum number of PCI functions which
596 this kernel will support.
599 int "Maximum number of MSI interrupts (64-32768)"
603 This defines the number of virtual interrupts the kernel will
604 provide for MSI interrupts. If you configure your system to have
605 too few drivers will fail to allocate MSI interrupts for all
608 source "drivers/pci/Kconfig"
621 config NEED_SG_DMA_LENGTH
624 config NEED_DMA_MAP_STATE
629 prompt "Support for CHSC subchannels"
631 This driver allows usage of CHSC subchannels. A CHSC subchannel
632 is usually present on LPAR only.
633 The driver creates a device /dev/chsc, which may be used to
634 obtain I/O configuration information about the machine and
635 to issue asynchronous chsc commands (DANGEROUS).
636 You will usually only want to use this interface on a special
637 LPAR designated for system management.
639 To compile this driver as a module, choose M here: the
640 module will be called chsc_sch.
646 prompt "SCM bus driver"
648 Bus driver for Storage Class Memory.
652 prompt "Support for EADM subchannels"
655 This driver allows usage of EADM subchannels. EADM subchannels act
656 as a communication vehicle for SCM increments.
658 To compile this driver as a module, choose M here: the
659 module will be called eadm_sch.
666 bool "kernel crash dumps"
670 Generate crash dump after being started by kexec.
671 Crash dump kernels are loaded in the main kernel with kexec-tools
672 into a specially reserved region and then later executed after
673 a crash by kdump/kexec.
674 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
675 This option also enables s390 zfcpdump.
676 See also <file:Documentation/s390/zfcpdump.txt>
680 menu "Executable file formats / Emulations"
682 source "fs/Kconfig.binfmt"
686 prompt "Enable seccomp to safely compute untrusted bytecode"
689 This kernel feature is useful for number crunching applications
690 that may need to compute untrusted bytecode during their
691 execution. By using pipes or other transports made available to
692 the process as file descriptors supporting the read/write
693 syscalls, it's possible to isolate those applications in
694 their own address space using seccomp. Once seccomp is
695 enabled via /proc/<pid>/seccomp, it cannot be disabled
696 and the task is only allowed to execute a few safe syscalls
697 defined by each seccomp mode.
703 menu "Power Management"
705 config ARCH_HIBERNATION_POSSIBLE
708 source "kernel/power/Kconfig"
720 source "drivers/Kconfig"
724 source "arch/s390/Kconfig.debug"
726 source "security/Kconfig"
728 source "crypto/Kconfig"
732 menu "Virtualization"
736 prompt "Pseudo page fault support"
738 Select this option, if you want to use PFAULT pseudo page fault
739 handling under VM. If running native or in LPAR, this option
740 has no effect. If your VM does not support PFAULT, PAGEEX
741 pseudo page fault handling will be used.
742 Note that VM 4.2 supports PFAULT but has a bug in its
743 implementation that causes some problems.
744 Everybody who wants to run Linux under VM != VM4.2 should select
748 bool "VM shared kernel support"
749 depends on !JUMP_LABEL
751 Select this option, if you want to share the text segment of the
752 Linux kernel between different VM guests. This reduces memory
753 usage with lots of guests but greatly increases kernel size.
754 Also if a kernel was IPL'ed from a shared segment the kexec system
756 You should only select this option if you know what you are
757 doing and want to exploit this feature.
761 prompt "Cooperative memory management"
763 Select this option, if you want to enable the kernel interface
764 to reduce the memory size of the system. This is accomplished
765 by allocating pages of memory and put them "on hold". This only
766 makes sense for a system running under VM where the unused pages
767 will be reused by VM for other guest systems. The interface
768 allows an external monitor to balance memory of many systems.
769 Everybody who wants to run Linux under VM should select this
774 prompt "IUCV special message interface to cooperative memory management"
775 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
777 Select this option to enable the special message interface to
778 the cooperative memory management.
782 prompt "Linux - VM Monitor Stream, base infrastructure"
785 This provides a kernel interface for creating and updating z/VM APPLDATA
786 monitor records. The monitor records are updated at certain time
787 intervals, once the timer is started.
788 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
789 i.e. enables or disables monitoring on the Linux side.
790 A custom interval value (in seconds) can be written to
791 /proc/appldata/interval.
793 Defaults are 60 seconds interval and timer off.
794 The /proc entries can also be read from, showing the current settings.
798 prompt "Monitor memory management statistics"
799 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
801 This provides memory management related data to the Linux - VM Monitor
802 Stream, like paging/swapping rate, memory utilisation, etc.
803 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
804 APPLDATA monitor record, i.e. enables or disables monitoring this record
808 The /proc entry can also be read from, showing the current settings.
810 This can also be compiled as a module, which will be called
815 prompt "Monitor OS statistics"
816 depends on APPLDATA_BASE
818 This provides OS related data to the Linux - VM Monitor Stream, like
819 CPU utilisation, etc.
820 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
821 APPLDATA monitor record, i.e. enables or disables monitoring this record
825 This can also be compiled as a module, which will be called
828 config APPLDATA_NET_SUM
830 prompt "Monitor overall network statistics"
831 depends on APPLDATA_BASE && NET
833 This provides network related data to the Linux - VM Monitor Stream,
834 currently there is only a total sum of network I/O statistics, no
836 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
837 APPLDATA monitor record, i.e. enables or disables monitoring this record
841 This can also be compiled as a module, which will be called
846 prompt "s390 hypervisor file system support"
847 select SYS_HYPERVISOR
849 This is a virtual file system intended to provide accounting
850 information in an s390 hypervisor environment.
852 source "arch/s390/kvm/Kconfig"
856 prompt "s390 support for virtio devices"
858 select VIRTUALIZATION
860 select VIRTIO_CONSOLE
862 Enabling this option adds support for virtio based paravirtual device
865 Select this option if you want to run the kernel as a guest under