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_DEBUG_KMEMLEAK
121 select HAVE_DYNAMIC_FTRACE if 64BIT
122 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
125 select HAVE_FUNCTION_TRACER if 64BIT
126 select HAVE_FUTEX_CMPXCHG if FUTEX
127 select HAVE_KERNEL_BZIP2
128 select HAVE_KERNEL_GZIP
129 select HAVE_KERNEL_LZ4
130 select HAVE_KERNEL_LZMA
131 select HAVE_KERNEL_LZO
132 select HAVE_KERNEL_XZ
134 select HAVE_KRETPROBES
135 select HAVE_KVM if 64BIT
137 select HAVE_MEMBLOCK_NODE_MAP
138 select HAVE_MEMBLOCK_PHYS_MAP
139 select HAVE_MOD_ARCH_SPECIFIC
141 select HAVE_PERF_EVENTS
142 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_SYSCALL_TRACEPOINTS
144 select HAVE_UID16 if 32BIT
145 select HAVE_VIRT_CPU_ACCOUNTING
146 select MODULES_USE_ELF_RELA
149 select OLD_SIGSUSPEND3
150 select SYSCTL_EXCEPTION_TRACE
152 select VIRT_CPU_ACCOUNTING
155 config SCHED_OMIT_FRAME_POINTER
158 source "init/Kconfig"
160 source "kernel/Kconfig.freezer"
162 menu "Processor type and features"
164 config HAVE_MARCH_Z900_FEATURES
167 config HAVE_MARCH_Z990_FEATURES
169 select HAVE_MARCH_Z900_FEATURES
171 config HAVE_MARCH_Z9_109_FEATURES
173 select HAVE_MARCH_Z990_FEATURES
175 config HAVE_MARCH_Z10_FEATURES
177 select HAVE_MARCH_Z9_109_FEATURES
179 config HAVE_MARCH_Z196_FEATURES
181 select HAVE_MARCH_Z10_FEATURES
183 config HAVE_MARCH_ZEC12_FEATURES
185 select HAVE_MARCH_Z196_FEATURES
187 config HAVE_MARCH_Z13_FEATURES
189 select HAVE_MARCH_ZEC12_FEATURES
192 prompt "Processor type"
196 bool "System/390 model G5 and G6"
199 Select this to build a 31 bit kernel that works
200 on all ESA/390 and z/Architecture machines.
203 bool "IBM zSeries model z800 and z900"
204 select HAVE_MARCH_Z900_FEATURES if 64BIT
206 Select this to enable optimizations for model z800/z900 (2064 and
207 2066 series). This will enable some optimizations that are not
208 available on older ESA/390 (31 Bit) only CPUs.
211 bool "IBM zSeries model z890 and z990"
212 select HAVE_MARCH_Z990_FEATURES if 64BIT
214 Select this to enable optimizations for model z890/z990 (2084 and
215 2086 series). The kernel will be slightly faster but will not work
220 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
222 Select this to enable optimizations for IBM System z9 (2094 and
223 2096 series). The kernel will be slightly faster but will not work
227 bool "IBM System z10"
228 select HAVE_MARCH_Z10_FEATURES if 64BIT
230 Select this to enable optimizations for IBM System z10 (2097 and
231 2098 series). The kernel will be slightly faster but will not work
235 bool "IBM zEnterprise 114 and 196"
236 select HAVE_MARCH_Z196_FEATURES if 64BIT
238 Select this to enable optimizations for IBM zEnterprise 114 and 196
239 (2818 and 2817 series). The kernel will be slightly faster but will
240 not work on older machines.
243 bool "IBM zBC12 and zEC12"
244 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
246 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
247 2827 series). The kernel will be slightly faster but will not work on
252 select HAVE_MARCH_Z13_FEATURES if 64BIT
254 Select this to enable optimizations for IBM z13 (2964 series).
255 The kernel will be slightly faster but will not work on older
261 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
263 config MARCH_Z900_TUNE
264 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
266 config MARCH_Z990_TUNE
267 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
269 config MARCH_Z9_109_TUNE
270 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
272 config MARCH_Z10_TUNE
273 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
275 config MARCH_Z196_TUNE
276 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
278 config MARCH_ZEC12_TUNE
279 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
281 config MARCH_Z13_TUNE
282 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
285 prompt "Tune code generation"
288 Cause the compiler to tune (-mtune) the generated code for a machine.
289 This will make the code run faster on the selected machine but
290 somewhat slower on other machines.
291 This option only changes how the compiler emits instructions, not the
292 selection of instructions itself, so the resulting kernel will run on
298 Tune the generated code for the target processor for which the kernel
302 bool "System/390 model G5 and G6"
305 bool "IBM zSeries model z800 and z900"
308 bool "IBM zSeries model z890 and z990"
314 bool "IBM System z10"
317 bool "IBM zEnterprise 114 and 196"
320 bool "IBM zBC12 and zEC12"
329 prompt "64 bit kernel"
331 Select this option if you have an IBM z/Architecture machine
332 and want to use the 64 bit addressing mode.
339 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
345 Select this option if you want to enable your system kernel to
346 handle system-calls from ELF binaries for 31 bit ESA. This option
347 (and some other stuff like libraries and such) is needed for
348 executing 31 bit applications. It is safe to say "Y".
350 config SYSVIPC_COMPAT
351 def_bool y if COMPAT && SYSVIPC
354 def_bool y if COMPAT && KEYS
358 prompt "Symmetric multi-processing support"
360 This enables support for systems with more than one CPU. If you have
361 a system with only one CPU, like most personal computers, say N. If
362 you have a system with more than one CPU, say Y.
364 If you say N here, the kernel will run on uni- and multiprocessor
365 machines, but will use only one CPU of a multiprocessor machine. If
366 you say Y here, the kernel will run on many, but not all,
367 uniprocessor machines. On a uniprocessor machine, the kernel
368 will run faster if you say N here.
370 See also the SMP-HOWTO available at
371 <http://www.tldp.org/docs.html#howto>.
373 Even if you don't know what to do here, say Y.
376 int "Maximum number of CPUs (2-512)"
379 default "32" if !64BIT
380 default "64" if 64BIT
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.
407 config SCHED_TOPOLOGY
409 prompt "Topology scheduler support"
415 Topology scheduler support improves the CPU scheduler's decision
416 making when dealing with machines that have multi-threading,
417 multiple cores or multiple books.
419 source kernel/Kconfig.preempt
423 prompt "IEEE FPU emulation"
426 This option is required for IEEE compliant floating point arithmetic
427 on older ESA/390 machines. Say Y unless you know your machine doesn't
430 source kernel/Kconfig.hz
436 config ARCH_SPARSEMEM_ENABLE
438 select SPARSEMEM_VMEMMAP_ENABLE
439 select SPARSEMEM_VMEMMAP
440 select SPARSEMEM_STATIC if !64BIT
442 config ARCH_SPARSEMEM_DEFAULT
445 config ARCH_SELECT_MEMORY_MODEL
448 config ARCH_ENABLE_MEMORY_HOTPLUG
449 def_bool y if SPARSEMEM
451 config ARCH_ENABLE_MEMORY_HOTREMOVE
454 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
458 config FORCE_MAX_ZONEORDER
466 prompt "Pack kernel stack"
468 This option enables the compiler option -mkernel-backchain if it
469 is available. If the option is available the compiler supports
470 the new stack layout which dramatically reduces the minimum stack
471 frame size. With an old compiler a non-leaf function needs a
472 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
473 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
474 and 24 byte on 64 bit.
476 Say Y if you are unsure.
480 prompt "Detect kernel stack overflow"
482 This option enables the compiler option -mstack-guard and
483 -mstack-size if they are available. If the compiler supports them
484 it will emit additional code to each function prolog to trigger
485 an illegal operation if the kernel stack is about to overflow.
487 Say N if you are unsure.
490 int "Size of the guard area (128-1024)"
492 depends on CHECK_STACK
495 This allows you to specify the size of the guard area at the lower
496 end of the kernel stack. If the kernel stack points into the guard
497 area on function entry an illegal operation is triggered. The size
498 needs to be a power of 2. Please keep in mind that the size of an
499 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
500 The minimum size for the stack guard should be 256 for 31 bit and
503 config WARN_DYNAMIC_STACK
505 prompt "Emit compiler warnings for function with dynamic stack usage"
507 This option enables the compiler option -mwarn-dynamicstack. If the
508 compiler supports this options generates warnings for functions
509 that dynamically allocate stack space using alloca.
511 Say N if you are unsure.
519 prompt "QDIO support"
521 This driver provides the Queued Direct I/O base support for
524 To compile this driver as a module, choose M here: the
525 module will be called qdio.
532 select HAVE_DMA_ATTRS
539 config PCI_NR_FUNCTIONS
540 int "Maximum number of PCI functions (1-4096)"
544 This allows you to specify the maximum number of PCI functions which
545 this kernel will support.
548 int "Maximum number of MSI interrupts (64-32768)"
552 This defines the number of virtual interrupts the kernel will
553 provide for MSI interrupts. If you configure your system to have
554 too few drivers will fail to allocate MSI interrupts for all
557 source "drivers/pci/Kconfig"
558 source "drivers/pci/pcie/Kconfig"
559 source "drivers/pci/hotplug/Kconfig"
574 select HAVE_DMA_API_DEBUG
576 config NEED_SG_DMA_LENGTH
579 config NEED_DMA_MAP_STATE
584 prompt "Support for CHSC subchannels"
586 This driver allows usage of CHSC subchannels. A CHSC subchannel
587 is usually present on LPAR only.
588 The driver creates a device /dev/chsc, which may be used to
589 obtain I/O configuration information about the machine and
590 to issue asynchronous chsc commands (DANGEROUS).
591 You will usually only want to use this interface on a special
592 LPAR designated for system management.
594 To compile this driver as a module, choose M here: the
595 module will be called chsc_sch.
602 prompt "SCM bus driver"
604 Bus driver for Storage Class Memory.
608 prompt "Support for EADM subchannels"
611 This driver allows usage of EADM subchannels. EADM subchannels act
612 as a communication vehicle for SCM increments.
614 To compile this driver as a module, choose M here: the
615 module will be called eadm_sch.
622 bool "kernel crash dumps"
623 depends on 64BIT && SMP
626 Generate crash dump after being started by kexec.
627 Crash dump kernels are loaded in the main kernel with kexec-tools
628 into a specially reserved region and then later executed after
629 a crash by kdump/kexec.
630 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
631 This option also enables s390 zfcpdump.
632 See also <file:Documentation/s390/zfcpdump.txt>
636 menu "Executable file formats / Emulations"
638 source "fs/Kconfig.binfmt"
642 prompt "Enable seccomp to safely compute untrusted bytecode"
645 This kernel feature is useful for number crunching applications
646 that may need to compute untrusted bytecode during their
647 execution. By using pipes or other transports made available to
648 the process as file descriptors supporting the read/write
649 syscalls, it's possible to isolate those applications in
650 their own address space using seccomp. Once seccomp is
651 enabled via /proc/<pid>/seccomp, it cannot be disabled
652 and the task is only allowed to execute a few safe syscalls
653 defined by each seccomp mode.
659 menu "Power Management"
661 config ARCH_HIBERNATION_POSSIBLE
664 source "kernel/power/Kconfig"
676 source "drivers/Kconfig"
680 source "arch/s390/Kconfig.debug"
682 source "security/Kconfig"
684 source "crypto/Kconfig"
688 menu "Virtualization"
692 prompt "Pseudo page fault support"
694 Select this option, if you want to use PFAULT pseudo page fault
695 handling under VM. If running native or in LPAR, this option
696 has no effect. If your VM does not support PFAULT, PAGEEX
697 pseudo page fault handling will be used.
698 Note that VM 4.2 supports PFAULT but has a bug in its
699 implementation that causes some problems.
700 Everybody who wants to run Linux under VM != VM4.2 should select
704 bool "VM shared kernel support"
705 depends on !JUMP_LABEL
707 Select this option, if you want to share the text segment of the
708 Linux kernel between different VM guests. This reduces memory
709 usage with lots of guests but greatly increases kernel size.
710 Also if a kernel was IPL'ed from a shared segment the kexec system
712 You should only select this option if you know what you are
713 doing and want to exploit this feature.
717 prompt "Cooperative memory management"
719 Select this option, if you want to enable the kernel interface
720 to reduce the memory size of the system. This is accomplished
721 by allocating pages of memory and put them "on hold". This only
722 makes sense for a system running under VM where the unused pages
723 will be reused by VM for other guest systems. The interface
724 allows an external monitor to balance memory of many systems.
725 Everybody who wants to run Linux under VM should select this
730 prompt "IUCV special message interface to cooperative memory management"
731 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
733 Select this option to enable the special message interface to
734 the cooperative memory management.
738 prompt "Linux - VM Monitor Stream, base infrastructure"
741 This provides a kernel interface for creating and updating z/VM APPLDATA
742 monitor records. The monitor records are updated at certain time
743 intervals, once the timer is started.
744 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
745 i.e. enables or disables monitoring on the Linux side.
746 A custom interval value (in seconds) can be written to
747 /proc/appldata/interval.
749 Defaults are 60 seconds interval and timer off.
750 The /proc entries can also be read from, showing the current settings.
754 prompt "Monitor memory management statistics"
755 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
757 This provides memory management related data to the Linux - VM Monitor
758 Stream, like paging/swapping rate, memory utilisation, etc.
759 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
760 APPLDATA monitor record, i.e. enables or disables monitoring this record
764 The /proc entry can also be read from, showing the current settings.
766 This can also be compiled as a module, which will be called
771 prompt "Monitor OS statistics"
772 depends on APPLDATA_BASE
774 This provides OS related data to the Linux - VM Monitor Stream, like
775 CPU utilisation, etc.
776 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
777 APPLDATA monitor record, i.e. enables or disables monitoring this record
781 This can also be compiled as a module, which will be called
784 config APPLDATA_NET_SUM
786 prompt "Monitor overall network statistics"
787 depends on APPLDATA_BASE && NET
789 This provides network related data to the Linux - VM Monitor Stream,
790 currently there is only a total sum of network I/O statistics, no
792 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
793 APPLDATA monitor record, i.e. enables or disables monitoring this record
797 This can also be compiled as a module, which will be called
802 prompt "s390 hypervisor file system support"
803 select SYS_HYPERVISOR
805 This is a virtual file system intended to provide accounting
806 information in an s390 hypervisor environment.
808 source "arch/s390/kvm/Kconfig"
812 prompt "s390 support for virtio devices"
815 select VIRTUALIZATION
817 select VIRTIO_CONSOLE
819 Enabling this option adds support for virtio based paravirtual device
822 Select this option if you want to run the kernel as a guest under