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
63 select ARCH_DISCARD_MEMBLOCK
64 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
65 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
66 select ARCH_HAVE_NMI_SAFE_CMPXCHG
67 select ARCH_INLINE_READ_LOCK
68 select ARCH_INLINE_READ_LOCK_BH
69 select ARCH_INLINE_READ_LOCK_IRQ
70 select ARCH_INLINE_READ_LOCK_IRQSAVE
71 select ARCH_INLINE_READ_TRYLOCK
72 select ARCH_INLINE_READ_UNLOCK
73 select ARCH_INLINE_READ_UNLOCK_BH
74 select ARCH_INLINE_READ_UNLOCK_IRQ
75 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
76 select ARCH_INLINE_SPIN_LOCK
77 select ARCH_INLINE_SPIN_LOCK_BH
78 select ARCH_INLINE_SPIN_LOCK_IRQ
79 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
80 select ARCH_INLINE_SPIN_TRYLOCK
81 select ARCH_INLINE_SPIN_TRYLOCK_BH
82 select ARCH_INLINE_SPIN_UNLOCK
83 select ARCH_INLINE_SPIN_UNLOCK_BH
84 select ARCH_INLINE_SPIN_UNLOCK_IRQ
85 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_WRITE_LOCK
87 select ARCH_INLINE_WRITE_LOCK_BH
88 select ARCH_INLINE_WRITE_LOCK_IRQ
89 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
90 select ARCH_INLINE_WRITE_TRYLOCK
91 select ARCH_INLINE_WRITE_UNLOCK
92 select ARCH_INLINE_WRITE_UNLOCK_BH
93 select ARCH_INLINE_WRITE_UNLOCK_IRQ
94 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
95 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
96 select ARCH_USE_CMPXCHG_LOCKREF
97 select ARCH_WANT_IPC_PARSE_VERSION
98 select BUILDTIME_EXTABLE_SORT
99 select CLONE_BACKWARDS2
100 select GENERIC_CLOCKEVENTS
101 select GENERIC_CPU_DEVICES if !SMP
102 select GENERIC_FIND_FIRST_BIT
103 select GENERIC_SMP_IDLE_THREAD
104 select GENERIC_TIME_VSYSCALL
105 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
106 select HAVE_ARCH_AUDITSYSCALL
107 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
108 select HAVE_ARCH_SECCOMP_FILTER
109 select HAVE_ARCH_TRACEHOOK
110 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
111 select HAVE_BPF_JIT if 64BIT && PACK_STACK
112 select HAVE_CMPXCHG_DOUBLE
113 select HAVE_CMPXCHG_LOCAL
114 select HAVE_C_RECORDMCOUNT
115 select HAVE_DEBUG_KMEMLEAK
116 select HAVE_DYNAMIC_FTRACE
117 select HAVE_FTRACE_MCOUNT_RECORD
118 select HAVE_FUNCTION_GRAPH_TRACER
119 select HAVE_FUNCTION_TRACER
120 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
121 select HAVE_FUTEX_CMPXCHG if FUTEX
122 select HAVE_KERNEL_BZIP2
123 select HAVE_KERNEL_GZIP
124 select HAVE_KERNEL_LZ4
125 select HAVE_KERNEL_LZMA
126 select HAVE_KERNEL_LZO
127 select HAVE_KERNEL_XZ
129 select HAVE_KRETPROBES
130 select HAVE_KVM if 64BIT
132 select HAVE_MEMBLOCK_NODE_MAP
133 select HAVE_MOD_ARCH_SPECIFIC
135 select HAVE_PERF_EVENTS
136 select HAVE_REGS_AND_STACK_ACCESS_API
137 select HAVE_SYSCALL_TRACEPOINTS
138 select HAVE_UID16 if 32BIT
139 select HAVE_VIRT_CPU_ACCOUNTING
140 select KTIME_SCALAR if 32BIT
141 select MODULES_USE_ELF_RELA
143 select OLD_SIGSUSPEND3
144 select SYSCTL_EXCEPTION_TRACE
146 select VIRT_CPU_ACCOUNTING
149 config SCHED_OMIT_FRAME_POINTER
152 source "init/Kconfig"
154 source "kernel/Kconfig.freezer"
156 menu "Processor type and features"
158 config HAVE_MARCH_Z900_FEATURES
161 config HAVE_MARCH_Z990_FEATURES
163 select HAVE_MARCH_Z900_FEATURES
165 config HAVE_MARCH_Z9_109_FEATURES
167 select HAVE_MARCH_Z990_FEATURES
169 config HAVE_MARCH_Z10_FEATURES
171 select HAVE_MARCH_Z9_109_FEATURES
173 config HAVE_MARCH_Z196_FEATURES
175 select HAVE_MARCH_Z10_FEATURES
177 config HAVE_MARCH_ZEC12_FEATURES
179 select HAVE_MARCH_Z196_FEATURES
182 prompt "Processor type"
186 bool "System/390 model G5 and G6"
189 Select this to build a 31 bit kernel that works
190 on all ESA/390 and z/Architecture machines.
193 bool "IBM zSeries model z800 and z900"
194 select HAVE_MARCH_Z900_FEATURES if 64BIT
196 Select this to enable optimizations for model z800/z900 (2064 and
197 2066 series). This will enable some optimizations that are not
198 available on older ESA/390 (31 Bit) only CPUs.
201 bool "IBM zSeries model z890 and z990"
202 select HAVE_MARCH_Z990_FEATURES if 64BIT
204 Select this to enable optimizations for model z890/z990 (2084 and
205 2086 series). The kernel will be slightly faster but will not work
210 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
212 Select this to enable optimizations for IBM System z9 (2094 and
213 2096 series). The kernel will be slightly faster but will not work
217 bool "IBM System z10"
218 select HAVE_MARCH_Z10_FEATURES if 64BIT
220 Select this to enable optimizations for IBM System z10 (2097 and
221 2098 series). The kernel will be slightly faster but will not work
225 bool "IBM zEnterprise 114 and 196"
226 select HAVE_MARCH_Z196_FEATURES if 64BIT
228 Select this to enable optimizations for IBM zEnterprise 114 and 196
229 (2818 and 2817 series). The kernel will be slightly faster but will
230 not work on older machines.
233 bool "IBM zBC12 and zEC12"
234 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
236 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
237 2827 series). The kernel will be slightly faster but will not work on
243 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
245 config MARCH_Z900_TUNE
246 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
248 config MARCH_Z990_TUNE
249 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
251 config MARCH_Z9_109_TUNE
252 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
254 config MARCH_Z10_TUNE
255 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
257 config MARCH_Z196_TUNE
258 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
260 config MARCH_ZEC12_TUNE
261 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
264 prompt "Tune code generation"
267 Cause the compiler to tune (-mtune) the generated code for a machine.
268 This will make the code run faster on the selected machine but
269 somewhat slower on other machines.
270 This option only changes how the compiler emits instructions, not the
271 selection of instructions itself, so the resulting kernel will run on
277 Tune the generated code for the target processor for which the kernel
281 bool "System/390 model G5 and G6"
284 bool "IBM zSeries model z800 and z900"
287 bool "IBM zSeries model z890 and z990"
293 bool "IBM System z10"
296 bool "IBM zEnterprise 114 and 196"
299 bool "IBM zBC12 and zEC12"
305 prompt "64 bit kernel"
307 Select this option if you have an IBM z/Architecture machine
308 and want to use the 64 bit addressing mode.
315 prompt "Kernel support for 31 bit emulation"
317 select COMPAT_BINFMT_ELF if BINFMT_ELF
318 select ARCH_WANT_OLD_COMPAT_IPC
319 select COMPAT_OLD_SIGACTION
321 Select this option if you want to enable your system kernel to
322 handle system-calls from ELF binaries for 31 bit ESA. This option
323 (and some other stuff like libraries and such) is needed for
324 executing 31 bit applications. It is safe to say "Y".
326 config SYSVIPC_COMPAT
327 def_bool y if COMPAT && SYSVIPC
330 def_bool y if COMPAT && KEYS
334 prompt "Symmetric multi-processing support"
336 This enables support for systems with more than one CPU. If you have
337 a system with only one CPU, like most personal computers, say N. If
338 you have a system with more than one CPU, say Y.
340 If you say N here, the kernel will run on uni- and multiprocessor
341 machines, but will use only one CPU of a multiprocessor machine. If
342 you say Y here, the kernel will run on many, but not all,
343 uniprocessor machines. On a uniprocessor machine, the kernel
344 will run faster if you say N here.
346 See also the SMP-HOWTO available at
347 <http://www.tldp.org/docs.html#howto>.
349 Even if you don't know what to do here, say Y.
352 int "Maximum number of CPUs (2-256)"
355 default "32" if !64BIT
356 default "64" if 64BIT
358 This allows you to specify the maximum number of CPUs which this
359 kernel will support. The maximum supported value is 256 and the
360 minimum value which makes sense is 2.
362 This is purely to save memory - each supported CPU adds
363 approximately sixteen kilobytes to the kernel image.
367 prompt "Support for hot-pluggable CPUs"
370 Say Y here to be able to turn CPUs off and on. CPUs
371 can be controlled through /sys/devices/system/cpu/cpu#.
372 Say N if you want to disable CPU hotplug.
379 prompt "Book scheduler support"
383 Book scheduler support improves the CPU scheduler's decision making
384 when dealing with machines that have several books.
386 source kernel/Kconfig.preempt
390 prompt "IEEE FPU emulation"
393 This option is required for IEEE compliant floating point arithmetic
394 on older ESA/390 machines. Say Y unless you know your machine doesn't
397 source kernel/Kconfig.hz
403 config ARCH_SPARSEMEM_ENABLE
405 select SPARSEMEM_VMEMMAP_ENABLE
406 select SPARSEMEM_VMEMMAP
407 select SPARSEMEM_STATIC if !64BIT
409 config ARCH_SPARSEMEM_DEFAULT
412 config ARCH_SELECT_MEMORY_MODEL
415 config ARCH_ENABLE_MEMORY_HOTPLUG
416 def_bool y if SPARSEMEM
418 config ARCH_ENABLE_MEMORY_HOTREMOVE
421 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
425 config FORCE_MAX_ZONEORDER
433 prompt "Pack kernel stack"
435 This option enables the compiler option -mkernel-backchain if it
436 is available. If the option is available the compiler supports
437 the new stack layout which dramatically reduces the minimum stack
438 frame size. With an old compiler a non-leaf function needs a
439 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
440 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
441 and 24 byte on 64 bit.
443 Say Y if you are unsure.
447 prompt "Detect kernel stack overflow"
449 This option enables the compiler option -mstack-guard and
450 -mstack-size if they are available. If the compiler supports them
451 it will emit additional code to each function prolog to trigger
452 an illegal operation if the kernel stack is about to overflow.
454 Say N if you are unsure.
457 int "Size of the guard area (128-1024)"
459 depends on CHECK_STACK
462 This allows you to specify the size of the guard area at the lower
463 end of the kernel stack. If the kernel stack points into the guard
464 area on function entry an illegal operation is triggered. The size
465 needs to be a power of 2. Please keep in mind that the size of an
466 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
467 The minimum size for the stack guard should be 256 for 31 bit and
470 config WARN_DYNAMIC_STACK
472 prompt "Emit compiler warnings for function with dynamic stack usage"
474 This option enables the compiler option -mwarn-dynamicstack. If the
475 compiler supports this options generates warnings for functions
476 that dynamically allocate stack space using alloca.
478 Say N if you are unsure.
486 prompt "QDIO support"
488 This driver provides the Queued Direct I/O base support for
491 To compile this driver as a module, choose M here: the
492 module will be called qdio.
506 config PCI_NR_FUNCTIONS
507 int "Maximum number of PCI functions (1-4096)"
511 This allows you to specify the maximum number of PCI functions which
512 this kernel will support.
515 int "Maximum number of MSI interrupts (64-32768)"
519 This defines the number of virtual interrupts the kernel will
520 provide for MSI interrupts. If you configure your system to have
521 too few drivers will fail to allocate MSI interrupts for all
524 source "drivers/pci/Kconfig"
525 source "drivers/pci/pcie/Kconfig"
526 source "drivers/pci/hotplug/Kconfig"
541 select HAVE_DMA_API_DEBUG
543 config NEED_SG_DMA_LENGTH
546 config HAVE_DMA_ATTRS
549 config NEED_DMA_MAP_STATE
554 prompt "Support for CHSC subchannels"
556 This driver allows usage of CHSC subchannels. A CHSC subchannel
557 is usually present on LPAR only.
558 The driver creates a device /dev/chsc, which may be used to
559 obtain I/O configuration information about the machine and
560 to issue asynchronous chsc commands (DANGEROUS).
561 You will usually only want to use this interface on a special
562 LPAR designated for system management.
564 To compile this driver as a module, choose M here: the
565 module will be called chsc_sch.
572 prompt "SCM bus driver"
574 Bus driver for Storage Class Memory.
578 prompt "Support for EADM subchannels"
581 This driver allows usage of EADM subchannels. EADM subchannels act
582 as a communication vehicle for SCM increments.
584 To compile this driver as a module, choose M here: the
585 module will be called eadm_sch.
592 bool "kernel crash dumps"
593 depends on 64BIT && SMP
597 Generate crash dump after being started by kexec.
598 Crash dump kernels are loaded in the main kernel with kexec-tools
599 into a specially reserved region and then later executed after
600 a crash by kdump/kexec.
601 For more details see Documentation/kdump/kdump.txt
605 prompt "zfcpdump support"
606 depends on 64BIT && SMP
608 Select this option if you want to build an zfcpdump enabled kernel.
609 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
613 menu "Executable file formats / Emulations"
615 source "fs/Kconfig.binfmt"
619 prompt "Enable seccomp to safely compute untrusted bytecode"
622 This kernel feature is useful for number crunching applications
623 that may need to compute untrusted bytecode during their
624 execution. By using pipes or other transports made available to
625 the process as file descriptors supporting the read/write
626 syscalls, it's possible to isolate those applications in
627 their own address space using seccomp. Once seccomp is
628 enabled via /proc/<pid>/seccomp, it cannot be disabled
629 and the task is only allowed to execute a few safe syscalls
630 defined by each seccomp mode.
636 menu "Power Management"
638 config ARCH_HIBERNATION_POSSIBLE
641 source "kernel/power/Kconfig"
653 source "drivers/Kconfig"
657 source "arch/s390/Kconfig.debug"
659 source "security/Kconfig"
661 source "crypto/Kconfig"
665 menu "Virtualization"
669 prompt "Pseudo page fault support"
671 Select this option, if you want to use PFAULT pseudo page fault
672 handling under VM. If running native or in LPAR, this option
673 has no effect. If your VM does not support PFAULT, PAGEEX
674 pseudo page fault handling will be used.
675 Note that VM 4.2 supports PFAULT but has a bug in its
676 implementation that causes some problems.
677 Everybody who wants to run Linux under VM != VM4.2 should select
681 bool "VM shared kernel support"
682 depends on !JUMP_LABEL
684 Select this option, if you want to share the text segment of the
685 Linux kernel between different VM guests. This reduces memory
686 usage with lots of guests but greatly increases kernel size.
687 Also if a kernel was IPL'ed from a shared segment the kexec system
689 You should only select this option if you know what you are
690 doing and want to exploit this feature.
694 prompt "Cooperative memory management"
696 Select this option, if you want to enable the kernel interface
697 to reduce the memory size of the system. This is accomplished
698 by allocating pages of memory and put them "on hold". This only
699 makes sense for a system running under VM where the unused pages
700 will be reused by VM for other guest systems. The interface
701 allows an external monitor to balance memory of many systems.
702 Everybody who wants to run Linux under VM should select this
707 prompt "IUCV special message interface to cooperative memory management"
708 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
710 Select this option to enable the special message interface to
711 the cooperative memory management.
715 prompt "Linux - VM Monitor Stream, base infrastructure"
718 This provides a kernel interface for creating and updating z/VM APPLDATA
719 monitor records. The monitor records are updated at certain time
720 intervals, once the timer is started.
721 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
722 i.e. enables or disables monitoring on the Linux side.
723 A custom interval value (in seconds) can be written to
724 /proc/appldata/interval.
726 Defaults are 60 seconds interval and timer off.
727 The /proc entries can also be read from, showing the current settings.
731 prompt "Monitor memory management statistics"
732 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
734 This provides memory management related data to the Linux - VM Monitor
735 Stream, like paging/swapping rate, memory utilisation, etc.
736 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
737 APPLDATA monitor record, i.e. enables or disables monitoring this record
741 The /proc entry can also be read from, showing the current settings.
743 This can also be compiled as a module, which will be called
748 prompt "Monitor OS statistics"
749 depends on APPLDATA_BASE
751 This provides OS related data to the Linux - VM Monitor Stream, like
752 CPU utilisation, etc.
753 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
754 APPLDATA monitor record, i.e. enables or disables monitoring this record
758 This can also be compiled as a module, which will be called
761 config APPLDATA_NET_SUM
763 prompt "Monitor overall network statistics"
764 depends on APPLDATA_BASE && NET
766 This provides network related data to the Linux - VM Monitor Stream,
767 currently there is only a total sum of network I/O statistics, no
769 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
770 APPLDATA monitor record, i.e. enables or disables monitoring this record
774 This can also be compiled as a module, which will be called
779 prompt "s390 hypervisor file system support"
780 select SYS_HYPERVISOR
782 This is a virtual file system intended to provide accounting
783 information in an s390 hypervisor environment.
785 source "arch/s390/kvm/Kconfig"
789 prompt "s390 support for virtio devices"
792 select VIRTUALIZATION
794 select VIRTIO_CONSOLE
796 Enabling this option adds support for virtio based paravirtual device
799 Select this option if you want to run the kernel as a guest under