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_JUMP_LABEL if !MARCH_G5
107 select HAVE_ARCH_SECCOMP_FILTER
108 select HAVE_ARCH_TRACEHOOK
109 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
110 select HAVE_BPF_JIT if 64BIT && PACK_STACK
111 select HAVE_CMPXCHG_DOUBLE
112 select HAVE_CMPXCHG_LOCAL
113 select HAVE_C_RECORDMCOUNT
114 select HAVE_DEBUG_KMEMLEAK
115 select HAVE_DYNAMIC_FTRACE
116 select HAVE_FTRACE_MCOUNT_RECORD
117 select HAVE_FUNCTION_GRAPH_TRACER
118 select HAVE_FUNCTION_TRACER
119 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
120 select HAVE_KERNEL_BZIP2
121 select HAVE_KERNEL_GZIP
122 select HAVE_KERNEL_LZ4
123 select HAVE_KERNEL_LZMA
124 select HAVE_KERNEL_LZO
125 select HAVE_KERNEL_XZ
127 select HAVE_KRETPROBES
128 select HAVE_KVM if 64BIT
130 select HAVE_MEMBLOCK_NODE_MAP
131 select HAVE_MOD_ARCH_SPECIFIC
133 select HAVE_PERF_EVENTS
134 select HAVE_REGS_AND_STACK_ACCESS_API
135 select HAVE_SYSCALL_TRACEPOINTS
136 select HAVE_UID16 if 32BIT
137 select HAVE_VIRT_CPU_ACCOUNTING
138 select INIT_ALL_POSSIBLE
139 select KTIME_SCALAR if 32BIT
140 select MODULES_USE_ELF_RELA
142 select OLD_SIGSUSPEND3
143 select SYSCTL_EXCEPTION_TRACE
144 select VIRT_CPU_ACCOUNTING
147 config SCHED_OMIT_FRAME_POINTER
150 source "init/Kconfig"
152 source "kernel/Kconfig.freezer"
154 menu "Processor type and features"
156 config HAVE_MARCH_Z900_FEATURES
159 config HAVE_MARCH_Z990_FEATURES
161 select HAVE_MARCH_Z900_FEATURES
163 config HAVE_MARCH_Z9_109_FEATURES
165 select HAVE_MARCH_Z990_FEATURES
167 config HAVE_MARCH_Z10_FEATURES
169 select HAVE_MARCH_Z9_109_FEATURES
171 config HAVE_MARCH_Z196_FEATURES
173 select HAVE_MARCH_Z10_FEATURES
175 config HAVE_MARCH_ZEC12_FEATURES
177 select HAVE_MARCH_Z196_FEATURES
180 prompt "Processor type"
184 bool "System/390 model G5 and G6"
187 Select this to build a 31 bit kernel that works
188 on all ESA/390 and z/Architecture machines.
191 bool "IBM zSeries model z800 and z900"
192 select HAVE_MARCH_Z900_FEATURES if 64BIT
194 Select this to enable optimizations for model z800/z900 (2064 and
195 2066 series). This will enable some optimizations that are not
196 available on older ESA/390 (31 Bit) only CPUs.
199 bool "IBM zSeries model z890 and z990"
200 select HAVE_MARCH_Z990_FEATURES if 64BIT
202 Select this to enable optimizations for model z890/z990 (2084 and
203 2086 series). The kernel will be slightly faster but will not work
208 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
210 Select this to enable optimizations for IBM System z9 (2094 and
211 2096 series). The kernel will be slightly faster but will not work
215 bool "IBM System z10"
216 select HAVE_MARCH_Z10_FEATURES if 64BIT
218 Select this to enable optimizations for IBM System z10 (2097 and
219 2098 series). The kernel will be slightly faster but will not work
223 bool "IBM zEnterprise 114 and 196"
224 select HAVE_MARCH_Z196_FEATURES if 64BIT
226 Select this to enable optimizations for IBM zEnterprise 114 and 196
227 (2818 and 2817 series). The kernel will be slightly faster but will
228 not work on older machines.
231 bool "IBM zBC12 and zEC12"
232 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
234 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
235 2827 series). The kernel will be slightly faster but will not work on
241 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
243 config MARCH_Z900_TUNE
244 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
246 config MARCH_Z990_TUNE
247 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
249 config MARCH_Z9_109_TUNE
250 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
252 config MARCH_Z10_TUNE
253 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
255 config MARCH_Z196_TUNE
256 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
258 config MARCH_ZEC12_TUNE
259 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
262 prompt "Tune code generation"
265 Cause the compiler to tune (-mtune) the generated code for a machine.
266 This will make the code run faster on the selected machine but
267 somewhat slower on other machines.
268 This option only changes how the compiler emits instructions, not the
269 selection of instructions itself, so the resulting kernel will run on
275 Tune the generated code for the target processor for which the kernel
279 bool "System/390 model G5 and G6"
282 bool "IBM zSeries model z800 and z900"
285 bool "IBM zSeries model z890 and z990"
291 bool "IBM System z10"
294 bool "IBM zEnterprise 114 and 196"
297 bool "IBM zBC12 and zEC12"
303 prompt "64 bit kernel"
305 Select this option if you have an IBM z/Architecture machine
306 and want to use the 64 bit addressing mode.
313 prompt "Kernel support for 31 bit emulation"
315 select COMPAT_BINFMT_ELF if BINFMT_ELF
316 select ARCH_WANT_OLD_COMPAT_IPC
317 select COMPAT_OLD_SIGACTION
319 Select this option if you want to enable your system kernel to
320 handle system-calls from ELF binaries for 31 bit ESA. This option
321 (and some other stuff like libraries and such) is needed for
322 executing 31 bit applications. It is safe to say "Y".
324 config SYSVIPC_COMPAT
325 def_bool y if COMPAT && SYSVIPC
328 def_bool y if COMPAT && KEYS
332 prompt "Symmetric multi-processing support"
334 This enables support for systems with more than one CPU. If you have
335 a system with only one CPU, like most personal computers, say N. If
336 you have a system with more than one CPU, say Y.
338 If you say N here, the kernel will run on single and multiprocessor
339 machines, but will use only one CPU of a multiprocessor machine. If
340 you say Y here, the kernel will run on many, but not all,
341 singleprocessor machines. On a singleprocessor machine, the kernel
342 will run faster if you say N here.
344 See also the SMP-HOWTO available at
345 <http://www.tldp.org/docs.html#howto>.
347 Even if you don't know what to do here, say Y.
350 int "Maximum number of CPUs (2-64)"
353 default "32" if !64BIT
354 default "64" if 64BIT
356 This allows you to specify the maximum number of CPUs which this
357 kernel will support. The maximum supported value is 64 and the
358 minimum value which makes sense is 2.
360 This is purely to save memory - each supported CPU adds
361 approximately sixteen kilobytes to the kernel image.
365 prompt "Support for hot-pluggable CPUs"
368 Say Y here to be able to turn CPUs off and on. CPUs
369 can be controlled through /sys/devices/system/cpu/cpu#.
370 Say N if you want to disable CPU hotplug.
377 prompt "Book scheduler support"
381 Book scheduler support improves the CPU scheduler's decision making
382 when dealing with machines that have several books.
384 source kernel/Kconfig.preempt
388 prompt "IEEE FPU emulation"
391 This option is required for IEEE compliant floating point arithmetic
392 on older ESA/390 machines. Say Y unless you know your machine doesn't
395 source kernel/Kconfig.hz
401 config ARCH_SPARSEMEM_ENABLE
403 select SPARSEMEM_VMEMMAP_ENABLE
404 select SPARSEMEM_VMEMMAP
405 select SPARSEMEM_STATIC if !64BIT
407 config ARCH_SPARSEMEM_DEFAULT
410 config ARCH_SELECT_MEMORY_MODEL
413 config ARCH_ENABLE_MEMORY_HOTPLUG
414 def_bool y if SPARSEMEM
416 config ARCH_ENABLE_MEMORY_HOTREMOVE
419 config FORCE_MAX_ZONEORDER
427 prompt "Pack kernel stack"
429 This option enables the compiler option -mkernel-backchain if it
430 is available. If the option is available the compiler supports
431 the new stack layout which dramatically reduces the minimum stack
432 frame size. With an old compiler a non-leaf function needs a
433 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
434 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
435 and 24 byte on 64 bit.
437 Say Y if you are unsure.
441 prompt "Detect kernel stack overflow"
443 This option enables the compiler option -mstack-guard and
444 -mstack-size if they are available. If the compiler supports them
445 it will emit additional code to each function prolog to trigger
446 an illegal operation if the kernel stack is about to overflow.
448 Say N if you are unsure.
451 int "Size of the guard area (128-1024)"
453 depends on CHECK_STACK
456 This allows you to specify the size of the guard area at the lower
457 end of the kernel stack. If the kernel stack points into the guard
458 area on function entry an illegal operation is triggered. The size
459 needs to be a power of 2. Please keep in mind that the size of an
460 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
461 The minimum size for the stack guard should be 256 for 31 bit and
464 config WARN_DYNAMIC_STACK
466 prompt "Emit compiler warnings for function with dynamic stack usage"
468 This option enables the compiler option -mwarn-dynamicstack. If the
469 compiler supports this options generates warnings for functions
470 that dynamically allocate stack space using alloca.
472 Say N if you are unsure.
480 prompt "QDIO support"
482 This driver provides the Queued Direct I/O base support for
485 To compile this driver as a module, choose M here: the
486 module will be called qdio.
500 config PCI_NR_FUNCTIONS
501 int "Maximum number of PCI functions (1-4096)"
505 This allows you to specify the maximum number of PCI functions which
506 this kernel will support.
509 int "Maximum number of MSI interrupts (64-32768)"
513 This defines the number of virtual interrupts the kernel will
514 provide for MSI interrupts. If you configure your system to have
515 too few drivers will fail to allocate MSI interrupts for all
518 source "drivers/pci/Kconfig"
519 source "drivers/pci/pcie/Kconfig"
520 source "drivers/pci/hotplug/Kconfig"
535 select HAVE_DMA_API_DEBUG
537 config NEED_SG_DMA_LENGTH
540 config HAVE_DMA_ATTRS
543 config NEED_DMA_MAP_STATE
548 prompt "Support for CHSC subchannels"
550 This driver allows usage of CHSC subchannels. A CHSC subchannel
551 is usually present on LPAR only.
552 The driver creates a device /dev/chsc, which may be used to
553 obtain I/O configuration information about the machine and
554 to issue asynchronous chsc commands (DANGEROUS).
555 You will usually only want to use this interface on a special
556 LPAR designated for system management.
558 To compile this driver as a module, choose M here: the
559 module will be called chsc_sch.
566 prompt "SCM bus driver"
568 Bus driver for Storage Class Memory.
572 prompt "Support for EADM subchannels"
575 This driver allows usage of EADM subchannels. EADM subchannels act
576 as a communication vehicle for SCM increments.
578 To compile this driver as a module, choose M here: the
579 module will be called eadm_sch.
586 bool "kernel crash dumps"
587 depends on 64BIT && SMP
591 Generate crash dump after being started by kexec.
592 Crash dump kernels are loaded in the main kernel with kexec-tools
593 into a specially reserved region and then later executed after
594 a crash by kdump/kexec.
595 For more details see Documentation/kdump/kdump.txt
599 prompt "zfcpdump support"
602 Select this option if you want to build an zfcpdump enabled kernel.
603 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
607 menu "Executable file formats / Emulations"
609 source "fs/Kconfig.binfmt"
613 prompt "Enable seccomp to safely compute untrusted bytecode"
616 This kernel feature is useful for number crunching applications
617 that may need to compute untrusted bytecode during their
618 execution. By using pipes or other transports made available to
619 the process as file descriptors supporting the read/write
620 syscalls, it's possible to isolate those applications in
621 their own address space using seccomp. Once seccomp is
622 enabled via /proc/<pid>/seccomp, it cannot be disabled
623 and the task is only allowed to execute a few safe syscalls
624 defined by each seccomp mode.
630 menu "Power Management"
632 config ARCH_HIBERNATION_POSSIBLE
635 source "kernel/power/Kconfig"
647 source "drivers/Kconfig"
651 source "arch/s390/Kconfig.debug"
653 source "security/Kconfig"
655 source "crypto/Kconfig"
659 menu "Virtualization"
663 prompt "Pseudo page fault support"
665 Select this option, if you want to use PFAULT pseudo page fault
666 handling under VM. If running native or in LPAR, this option
667 has no effect. If your VM does not support PFAULT, PAGEEX
668 pseudo page fault handling will be used.
669 Note that VM 4.2 supports PFAULT but has a bug in its
670 implementation that causes some problems.
671 Everybody who wants to run Linux under VM != VM4.2 should select
675 bool "VM shared kernel support"
676 depends on !JUMP_LABEL
678 Select this option, if you want to share the text segment of the
679 Linux kernel between different VM guests. This reduces memory
680 usage with lots of guests but greatly increases kernel size.
681 Also if a kernel was IPL'ed from a shared segment the kexec system
683 You should only select this option if you know what you are
684 doing and want to exploit this feature.
688 prompt "Cooperative memory management"
690 Select this option, if you want to enable the kernel interface
691 to reduce the memory size of the system. This is accomplished
692 by allocating pages of memory and put them "on hold". This only
693 makes sense for a system running under VM where the unused pages
694 will be reused by VM for other guest systems. The interface
695 allows an external monitor to balance memory of many systems.
696 Everybody who wants to run Linux under VM should select this
701 prompt "IUCV special message interface to cooperative memory management"
702 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
704 Select this option to enable the special message interface to
705 the cooperative memory management.
709 prompt "Linux - VM Monitor Stream, base infrastructure"
712 This provides a kernel interface for creating and updating z/VM APPLDATA
713 monitor records. The monitor records are updated at certain time
714 intervals, once the timer is started.
715 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
716 i.e. enables or disables monitoring on the Linux side.
717 A custom interval value (in seconds) can be written to
718 /proc/appldata/interval.
720 Defaults are 60 seconds interval and timer off.
721 The /proc entries can also be read from, showing the current settings.
725 prompt "Monitor memory management statistics"
726 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
728 This provides memory management related data to the Linux - VM Monitor
729 Stream, like paging/swapping rate, memory utilisation, etc.
730 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
731 APPLDATA monitor record, i.e. enables or disables monitoring this record
735 The /proc entry can also be read from, showing the current settings.
737 This can also be compiled as a module, which will be called
742 prompt "Monitor OS statistics"
743 depends on APPLDATA_BASE
745 This provides OS related data to the Linux - VM Monitor Stream, like
746 CPU utilisation, etc.
747 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
748 APPLDATA monitor record, i.e. enables or disables monitoring this record
752 This can also be compiled as a module, which will be called
755 config APPLDATA_NET_SUM
757 prompt "Monitor overall network statistics"
758 depends on APPLDATA_BASE && NET
760 This provides network related data to the Linux - VM Monitor Stream,
761 currently there is only a total sum of network I/O statistics, no
763 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
764 APPLDATA monitor record, i.e. enables or disables monitoring this record
768 This can also be compiled as a module, which will be called
773 prompt "s390 hypervisor file system support"
774 select SYS_HYPERVISOR
776 This is a virtual file system intended to provide accounting
777 information in an s390 hypervisor environment.
779 source "arch/s390/kvm/Kconfig"
783 prompt "s390 support for virtio devices"
786 select VIRTUALIZATION
788 select VIRTIO_CONSOLE
790 Enabling this option adds support for virtio based paravirtual device
793 Select this option if you want to run the kernel as a guest under