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_ELF_RANDOMIZE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_SG_CHAIN
71 select ARCH_HAVE_NMI_SAFE_CMPXCHG
72 select ARCH_INLINE_READ_LOCK
73 select ARCH_INLINE_READ_LOCK_BH
74 select ARCH_INLINE_READ_LOCK_IRQ
75 select ARCH_INLINE_READ_LOCK_IRQSAVE
76 select ARCH_INLINE_READ_TRYLOCK
77 select ARCH_INLINE_READ_UNLOCK
78 select ARCH_INLINE_READ_UNLOCK_BH
79 select ARCH_INLINE_READ_UNLOCK_IRQ
80 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
81 select ARCH_INLINE_SPIN_LOCK
82 select ARCH_INLINE_SPIN_LOCK_BH
83 select ARCH_INLINE_SPIN_LOCK_IRQ
84 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
85 select ARCH_INLINE_SPIN_TRYLOCK
86 select ARCH_INLINE_SPIN_TRYLOCK_BH
87 select ARCH_INLINE_SPIN_UNLOCK
88 select ARCH_INLINE_SPIN_UNLOCK_BH
89 select ARCH_INLINE_SPIN_UNLOCK_IRQ
90 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
91 select ARCH_INLINE_WRITE_LOCK
92 select ARCH_INLINE_WRITE_LOCK_BH
93 select ARCH_INLINE_WRITE_LOCK_IRQ
94 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
95 select ARCH_INLINE_WRITE_TRYLOCK
96 select ARCH_INLINE_WRITE_UNLOCK
97 select ARCH_INLINE_WRITE_UNLOCK_BH
98 select ARCH_INLINE_WRITE_UNLOCK_IRQ
99 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
100 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
101 select ARCH_SUPPORTS_ATOMIC_RMW
102 select ARCH_USE_CMPXCHG_LOCKREF
103 select ARCH_WANT_IPC_PARSE_VERSION
104 select BUILDTIME_EXTABLE_SORT
105 select CLONE_BACKWARDS2
106 select DYNAMIC_FTRACE if FUNCTION_TRACER
107 select GENERIC_CLOCKEVENTS
108 select GENERIC_CPU_DEVICES if !SMP
109 select GENERIC_FIND_FIRST_BIT
110 select GENERIC_SMP_IDLE_THREAD
111 select GENERIC_TIME_VSYSCALL
112 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
113 select HAVE_ARCH_AUDITSYSCALL
114 select HAVE_ARCH_JUMP_LABEL
115 select HAVE_ARCH_SECCOMP_FILTER
116 select HAVE_ARCH_TRACEHOOK
117 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
118 select HAVE_BPF_JIT if PACK_STACK
119 select HAVE_CMPXCHG_DOUBLE
120 select HAVE_CMPXCHG_LOCAL
121 select HAVE_DEBUG_KMEMLEAK
122 select HAVE_DYNAMIC_FTRACE
123 select HAVE_DYNAMIC_FTRACE_WITH_REGS
124 select HAVE_FTRACE_MCOUNT_RECORD
125 select HAVE_FUNCTION_GRAPH_TRACER
126 select HAVE_FUNCTION_TRACER
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
137 select HAVE_LIVEPATCH
139 select HAVE_MEMBLOCK_NODE_MAP
140 select HAVE_MEMBLOCK_PHYS_MAP
141 select HAVE_MOD_ARCH_SPECIFIC
143 select HAVE_PERF_EVENTS
144 select HAVE_REGS_AND_STACK_ACCESS_API
145 select HAVE_SYSCALL_TRACEPOINTS
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 config PGTABLE_LEVELS
164 source "init/Kconfig"
166 source "kernel/Kconfig.freezer"
168 source "kernel/livepatch/Kconfig"
170 menu "Processor type and features"
172 config HAVE_MARCH_Z900_FEATURES
175 config HAVE_MARCH_Z990_FEATURES
177 select HAVE_MARCH_Z900_FEATURES
179 config HAVE_MARCH_Z9_109_FEATURES
181 select HAVE_MARCH_Z990_FEATURES
183 config HAVE_MARCH_Z10_FEATURES
185 select HAVE_MARCH_Z9_109_FEATURES
187 config HAVE_MARCH_Z196_FEATURES
189 select HAVE_MARCH_Z10_FEATURES
191 config HAVE_MARCH_ZEC12_FEATURES
193 select HAVE_MARCH_Z196_FEATURES
195 config HAVE_MARCH_Z13_FEATURES
197 select HAVE_MARCH_ZEC12_FEATURES
200 prompt "Processor type"
204 bool "IBM zSeries model z800 and z900"
205 select HAVE_MARCH_Z900_FEATURES
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
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
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
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
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
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
255 Select this to enable optimizations for IBM z13 (2964 series).
256 The kernel will be slightly faster but will not work on older
261 config MARCH_Z900_TUNE
262 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
264 config MARCH_Z990_TUNE
265 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
267 config MARCH_Z9_109_TUNE
268 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
270 config MARCH_Z10_TUNE
271 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
273 config MARCH_Z196_TUNE
274 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
276 config MARCH_ZEC12_TUNE
277 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
279 config MARCH_Z13_TUNE
280 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
283 prompt "Tune code generation"
286 Cause the compiler to tune (-mtune) the generated code for a machine.
287 This will make the code run faster on the selected machine but
288 somewhat slower on other machines.
289 This option only changes how the compiler emits instructions, not the
290 selection of instructions itself, so the resulting kernel will run on
296 Tune the generated code for the target processor for which the kernel
300 bool "IBM zSeries model z800 and z900"
303 bool "IBM zSeries model z890 and z990"
309 bool "IBM System z10"
312 bool "IBM zEnterprise 114 and 196"
315 bool "IBM zBC12 and zEC12"
327 prompt "Kernel support for 31 bit emulation"
328 select COMPAT_BINFMT_ELF if BINFMT_ELF
329 select ARCH_WANT_OLD_COMPAT_IPC
330 select COMPAT_OLD_SIGACTION
332 Select this option if you want to enable your system kernel to
333 handle system-calls from ELF binaries for 31 bit ESA. This option
334 (and some other stuff like libraries and such) is needed for
335 executing 31 bit applications. It is safe to say "Y".
337 config SYSVIPC_COMPAT
338 def_bool y if COMPAT && SYSVIPC
341 def_bool y if COMPAT && KEYS
345 prompt "Symmetric multi-processing support"
347 This enables support for systems with more than one CPU. If you have
348 a system with only one CPU, like most personal computers, say N. If
349 you have a system with more than one CPU, say Y.
351 If you say N here, the kernel will run on uni- and multiprocessor
352 machines, but will use only one CPU of a multiprocessor machine. If
353 you say Y here, the kernel will run on many, but not all,
354 uniprocessor machines. On a uniprocessor machine, the kernel
355 will run faster if you say N here.
357 See also the SMP-HOWTO available at
358 <http://www.tldp.org/docs.html#howto>.
360 Even if you don't know what to do here, say Y.
363 int "Maximum number of CPUs (2-512)"
368 This allows you to specify the maximum number of CPUs which this
369 kernel will support. The maximum supported value is 512 and the
370 minimum value which makes sense is 2.
372 This is purely to save memory - each supported CPU adds
373 approximately sixteen kilobytes to the kernel image.
377 prompt "Support for hot-pluggable CPUs"
380 Say Y here to be able to turn CPUs off and on. CPUs
381 can be controlled through /sys/devices/system/cpu/cpu#.
382 Say N if you want to disable CPU hotplug.
393 config SCHED_TOPOLOGY
395 prompt "Topology scheduler support"
401 Topology scheduler support improves the CPU scheduler's decision
402 making when dealing with machines that have multi-threading,
403 multiple cores or multiple books.
405 source kernel/Kconfig.preempt
407 source kernel/Kconfig.hz
413 config ARCH_SPARSEMEM_ENABLE
415 select SPARSEMEM_VMEMMAP_ENABLE
416 select SPARSEMEM_VMEMMAP
418 config ARCH_SPARSEMEM_DEFAULT
421 config ARCH_SELECT_MEMORY_MODEL
424 config ARCH_ENABLE_MEMORY_HOTPLUG
425 def_bool y if SPARSEMEM
427 config ARCH_ENABLE_MEMORY_HOTREMOVE
430 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
433 config FORCE_MAX_ZONEORDER
441 prompt "Pack kernel stack"
443 This option enables the compiler option -mkernel-backchain if it
444 is available. If the option is available the compiler supports
445 the new stack layout which dramatically reduces the minimum stack
446 frame size. With an old compiler a non-leaf function needs a
447 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
448 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
449 and 24 byte on 64 bit.
451 Say Y if you are unsure.
455 prompt "Detect kernel stack overflow"
457 This option enables the compiler option -mstack-guard and
458 -mstack-size if they are available. If the compiler supports them
459 it will emit additional code to each function prolog to trigger
460 an illegal operation if the kernel stack is about to overflow.
462 Say N if you are unsure.
465 int "Size of the guard area (128-1024)"
467 depends on CHECK_STACK
470 This allows you to specify the size of the guard area at the lower
471 end of the kernel stack. If the kernel stack points into the guard
472 area on function entry an illegal operation is triggered. The size
473 needs to be a power of 2. Please keep in mind that the size of an
474 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
475 The minimum size for the stack guard should be 256 for 31 bit and
478 config WARN_DYNAMIC_STACK
480 prompt "Emit compiler warnings for function with dynamic stack usage"
482 This option enables the compiler option -mwarn-dynamicstack. If the
483 compiler supports this options generates warnings for functions
484 that dynamically allocate stack space using alloca.
486 Say N if you are unsure.
494 prompt "QDIO support"
496 This driver provides the Queued Direct I/O base support for
499 To compile this driver as a module, choose M here: the
500 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.
575 prompt "SCM bus driver"
577 Bus driver for Storage Class Memory.
581 prompt "Support for EADM subchannels"
584 This driver allows usage of EADM subchannels. EADM subchannels act
585 as a communication vehicle for SCM increments.
587 To compile this driver as a module, choose M here: the
588 module will be called eadm_sch.
595 bool "kernel crash dumps"
599 Generate crash dump after being started by kexec.
600 Crash dump kernels are loaded in the main kernel with kexec-tools
601 into a specially reserved region and then later executed after
602 a crash by kdump/kexec.
603 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
604 This option also enables s390 zfcpdump.
605 See also <file:Documentation/s390/zfcpdump.txt>
609 menu "Executable file formats / Emulations"
611 source "fs/Kconfig.binfmt"
615 prompt "Enable seccomp to safely compute untrusted bytecode"
618 This kernel feature is useful for number crunching applications
619 that may need to compute untrusted bytecode during their
620 execution. By using pipes or other transports made available to
621 the process as file descriptors supporting the read/write
622 syscalls, it's possible to isolate those applications in
623 their own address space using seccomp. Once seccomp is
624 enabled via /proc/<pid>/seccomp, it cannot be disabled
625 and the task is only allowed to execute a few safe syscalls
626 defined by each seccomp mode.
632 menu "Power Management"
634 config ARCH_HIBERNATION_POSSIBLE
637 source "kernel/power/Kconfig"
649 source "drivers/Kconfig"
653 source "arch/s390/Kconfig.debug"
655 source "security/Kconfig"
657 source "crypto/Kconfig"
661 menu "Virtualization"
665 prompt "Pseudo page fault support"
667 Select this option, if you want to use PFAULT pseudo page fault
668 handling under VM. If running native or in LPAR, this option
669 has no effect. If your VM does not support PFAULT, PAGEEX
670 pseudo page fault handling will be used.
671 Note that VM 4.2 supports PFAULT but has a bug in its
672 implementation that causes some problems.
673 Everybody who wants to run Linux under VM != VM4.2 should select
677 bool "VM shared kernel support"
678 depends on !JUMP_LABEL
680 Select this option, if you want to share the text segment of the
681 Linux kernel between different VM guests. This reduces memory
682 usage with lots of guests but greatly increases kernel size.
683 Also if a kernel was IPL'ed from a shared segment the kexec system
685 You should only select this option if you know what you are
686 doing and want to exploit this feature.
690 prompt "Cooperative memory management"
692 Select this option, if you want to enable the kernel interface
693 to reduce the memory size of the system. This is accomplished
694 by allocating pages of memory and put them "on hold". This only
695 makes sense for a system running under VM where the unused pages
696 will be reused by VM for other guest systems. The interface
697 allows an external monitor to balance memory of many systems.
698 Everybody who wants to run Linux under VM should select this
703 prompt "IUCV special message interface to cooperative memory management"
704 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
706 Select this option to enable the special message interface to
707 the cooperative memory management.
711 prompt "Linux - VM Monitor Stream, base infrastructure"
714 This provides a kernel interface for creating and updating z/VM APPLDATA
715 monitor records. The monitor records are updated at certain time
716 intervals, once the timer is started.
717 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
718 i.e. enables or disables monitoring on the Linux side.
719 A custom interval value (in seconds) can be written to
720 /proc/appldata/interval.
722 Defaults are 60 seconds interval and timer off.
723 The /proc entries can also be read from, showing the current settings.
727 prompt "Monitor memory management statistics"
728 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
730 This provides memory management related data to the Linux - VM Monitor
731 Stream, like paging/swapping rate, memory utilisation, etc.
732 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
733 APPLDATA monitor record, i.e. enables or disables monitoring this record
737 The /proc entry can also be read from, showing the current settings.
739 This can also be compiled as a module, which will be called
744 prompt "Monitor OS statistics"
745 depends on APPLDATA_BASE
747 This provides OS related data to the Linux - VM Monitor Stream, like
748 CPU utilisation, etc.
749 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
750 APPLDATA monitor record, i.e. enables or disables monitoring this record
754 This can also be compiled as a module, which will be called
757 config APPLDATA_NET_SUM
759 prompt "Monitor overall network statistics"
760 depends on APPLDATA_BASE && NET
762 This provides network related data to the Linux - VM Monitor Stream,
763 currently there is only a total sum of network I/O statistics, no
765 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
766 APPLDATA monitor record, i.e. enables or disables monitoring this record
770 This can also be compiled as a module, which will be called
775 prompt "s390 hypervisor file system support"
776 select SYS_HYPERVISOR
778 This is a virtual file system intended to provide accounting
779 information in an s390 hypervisor environment.
781 source "arch/s390/kvm/Kconfig"
785 prompt "s390 support for virtio devices"
787 select VIRTUALIZATION
789 select VIRTIO_CONSOLE
791 Enabling this option adds support for virtio based paravirtual device
794 Select this option if you want to run the kernel as a guest under