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_FUTEX_CMPXCHG if FUTEX
121 select HAVE_KERNEL_BZIP2
122 select HAVE_KERNEL_GZIP
123 select HAVE_KERNEL_LZ4
124 select HAVE_KERNEL_LZMA
125 select HAVE_KERNEL_LZO
126 select HAVE_KERNEL_XZ
128 select HAVE_KRETPROBES
129 select HAVE_KVM if 64BIT
131 select HAVE_MEMBLOCK_NODE_MAP
132 select HAVE_MOD_ARCH_SPECIFIC
134 select HAVE_PERF_EVENTS
135 select HAVE_REGS_AND_STACK_ACCESS_API
136 select HAVE_SYSCALL_TRACEPOINTS
137 select HAVE_UID16 if 32BIT
138 select HAVE_VIRT_CPU_ACCOUNTING
139 select KTIME_SCALAR if 32BIT
140 select MODULES_USE_ELF_RELA
142 select OLD_SIGSUSPEND3
143 select SYSCTL_EXCEPTION_TRACE
145 select VIRT_CPU_ACCOUNTING
148 config SCHED_OMIT_FRAME_POINTER
151 source "init/Kconfig"
153 source "kernel/Kconfig.freezer"
155 menu "Processor type and features"
157 config HAVE_MARCH_Z900_FEATURES
160 config HAVE_MARCH_Z990_FEATURES
162 select HAVE_MARCH_Z900_FEATURES
164 config HAVE_MARCH_Z9_109_FEATURES
166 select HAVE_MARCH_Z990_FEATURES
168 config HAVE_MARCH_Z10_FEATURES
170 select HAVE_MARCH_Z9_109_FEATURES
172 config HAVE_MARCH_Z196_FEATURES
174 select HAVE_MARCH_Z10_FEATURES
176 config HAVE_MARCH_ZEC12_FEATURES
178 select HAVE_MARCH_Z196_FEATURES
181 prompt "Processor type"
185 bool "System/390 model G5 and G6"
188 Select this to build a 31 bit kernel that works
189 on all ESA/390 and z/Architecture machines.
192 bool "IBM zSeries model z800 and z900"
193 select HAVE_MARCH_Z900_FEATURES if 64BIT
195 Select this to enable optimizations for model z800/z900 (2064 and
196 2066 series). This will enable some optimizations that are not
197 available on older ESA/390 (31 Bit) only CPUs.
200 bool "IBM zSeries model z890 and z990"
201 select HAVE_MARCH_Z990_FEATURES if 64BIT
203 Select this to enable optimizations for model z890/z990 (2084 and
204 2086 series). The kernel will be slightly faster but will not work
209 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
211 Select this to enable optimizations for IBM System z9 (2094 and
212 2096 series). The kernel will be slightly faster but will not work
216 bool "IBM System z10"
217 select HAVE_MARCH_Z10_FEATURES if 64BIT
219 Select this to enable optimizations for IBM System z10 (2097 and
220 2098 series). The kernel will be slightly faster but will not work
224 bool "IBM zEnterprise 114 and 196"
225 select HAVE_MARCH_Z196_FEATURES if 64BIT
227 Select this to enable optimizations for IBM zEnterprise 114 and 196
228 (2818 and 2817 series). The kernel will be slightly faster but will
229 not work on older machines.
232 bool "IBM zBC12 and zEC12"
233 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
235 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
236 2827 series). The kernel will be slightly faster but will not work on
242 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
244 config MARCH_Z900_TUNE
245 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
247 config MARCH_Z990_TUNE
248 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
250 config MARCH_Z9_109_TUNE
251 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
253 config MARCH_Z10_TUNE
254 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
256 config MARCH_Z196_TUNE
257 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
259 config MARCH_ZEC12_TUNE
260 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
263 prompt "Tune code generation"
266 Cause the compiler to tune (-mtune) the generated code for a machine.
267 This will make the code run faster on the selected machine but
268 somewhat slower on other machines.
269 This option only changes how the compiler emits instructions, not the
270 selection of instructions itself, so the resulting kernel will run on
276 Tune the generated code for the target processor for which the kernel
280 bool "System/390 model G5 and G6"
283 bool "IBM zSeries model z800 and z900"
286 bool "IBM zSeries model z890 and z990"
292 bool "IBM System z10"
295 bool "IBM zEnterprise 114 and 196"
298 bool "IBM zBC12 and zEC12"
304 prompt "64 bit kernel"
306 Select this option if you have an IBM z/Architecture machine
307 and want to use the 64 bit addressing mode.
314 prompt "Kernel support for 31 bit emulation"
316 select COMPAT_BINFMT_ELF if BINFMT_ELF
317 select ARCH_WANT_OLD_COMPAT_IPC
318 select COMPAT_OLD_SIGACTION
320 Select this option if you want to enable your system kernel to
321 handle system-calls from ELF binaries for 31 bit ESA. This option
322 (and some other stuff like libraries and such) is needed for
323 executing 31 bit applications. It is safe to say "Y".
325 config SYSVIPC_COMPAT
326 def_bool y if COMPAT && SYSVIPC
329 def_bool y if COMPAT && KEYS
333 prompt "Symmetric multi-processing support"
335 This enables support for systems with more than one CPU. If you have
336 a system with only one CPU, like most personal computers, say N. If
337 you have a system with more than one CPU, say Y.
339 If you say N here, the kernel will run on uni- and multiprocessor
340 machines, but will use only one CPU of a multiprocessor machine. If
341 you say Y here, the kernel will run on many, but not all,
342 uniprocessor machines. On a uniprocessor machine, the kernel
343 will run faster if you say N here.
345 See also the SMP-HOWTO available at
346 <http://www.tldp.org/docs.html#howto>.
348 Even if you don't know what to do here, say Y.
351 int "Maximum number of CPUs (2-256)"
354 default "32" if !64BIT
355 default "64" if 64BIT
357 This allows you to specify the maximum number of CPUs which this
358 kernel will support. The maximum supported value is 256 and the
359 minimum value which makes sense is 2.
361 This is purely to save memory - each supported CPU adds
362 approximately sixteen kilobytes to the kernel image.
366 prompt "Support for hot-pluggable CPUs"
369 Say Y here to be able to turn CPUs off and on. CPUs
370 can be controlled through /sys/devices/system/cpu/cpu#.
371 Say N if you want to disable CPU hotplug.
378 prompt "Book scheduler support"
382 Book scheduler support improves the CPU scheduler's decision making
383 when dealing with machines that have several books.
385 source kernel/Kconfig.preempt
389 prompt "IEEE FPU emulation"
392 This option is required for IEEE compliant floating point arithmetic
393 on older ESA/390 machines. Say Y unless you know your machine doesn't
396 source kernel/Kconfig.hz
402 config ARCH_SPARSEMEM_ENABLE
404 select SPARSEMEM_VMEMMAP_ENABLE
405 select SPARSEMEM_VMEMMAP
406 select SPARSEMEM_STATIC if !64BIT
408 config ARCH_SPARSEMEM_DEFAULT
411 config ARCH_SELECT_MEMORY_MODEL
414 config ARCH_ENABLE_MEMORY_HOTPLUG
415 def_bool y if SPARSEMEM
417 config ARCH_ENABLE_MEMORY_HOTREMOVE
420 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
424 config FORCE_MAX_ZONEORDER
432 prompt "Pack kernel stack"
434 This option enables the compiler option -mkernel-backchain if it
435 is available. If the option is available the compiler supports
436 the new stack layout which dramatically reduces the minimum stack
437 frame size. With an old compiler a non-leaf function needs a
438 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
439 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
440 and 24 byte on 64 bit.
442 Say Y if you are unsure.
446 prompt "Detect kernel stack overflow"
448 This option enables the compiler option -mstack-guard and
449 -mstack-size if they are available. If the compiler supports them
450 it will emit additional code to each function prolog to trigger
451 an illegal operation if the kernel stack is about to overflow.
453 Say N if you are unsure.
456 int "Size of the guard area (128-1024)"
458 depends on CHECK_STACK
461 This allows you to specify the size of the guard area at the lower
462 end of the kernel stack. If the kernel stack points into the guard
463 area on function entry an illegal operation is triggered. The size
464 needs to be a power of 2. Please keep in mind that the size of an
465 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
466 The minimum size for the stack guard should be 256 for 31 bit and
469 config WARN_DYNAMIC_STACK
471 prompt "Emit compiler warnings for function with dynamic stack usage"
473 This option enables the compiler option -mwarn-dynamicstack. If the
474 compiler supports this options generates warnings for functions
475 that dynamically allocate stack space using alloca.
477 Say N if you are unsure.
485 prompt "QDIO support"
487 This driver provides the Queued Direct I/O base support for
490 To compile this driver as a module, choose M here: the
491 module will be called qdio.
505 config PCI_NR_FUNCTIONS
506 int "Maximum number of PCI functions (1-4096)"
510 This allows you to specify the maximum number of PCI functions which
511 this kernel will support.
514 int "Maximum number of MSI interrupts (64-32768)"
518 This defines the number of virtual interrupts the kernel will
519 provide for MSI interrupts. If you configure your system to have
520 too few drivers will fail to allocate MSI interrupts for all
523 source "drivers/pci/Kconfig"
524 source "drivers/pci/pcie/Kconfig"
525 source "drivers/pci/hotplug/Kconfig"
540 select HAVE_DMA_API_DEBUG
542 config NEED_SG_DMA_LENGTH
545 config HAVE_DMA_ATTRS
548 config NEED_DMA_MAP_STATE
553 prompt "Support for CHSC subchannels"
555 This driver allows usage of CHSC subchannels. A CHSC subchannel
556 is usually present on LPAR only.
557 The driver creates a device /dev/chsc, which may be used to
558 obtain I/O configuration information about the machine and
559 to issue asynchronous chsc commands (DANGEROUS).
560 You will usually only want to use this interface on a special
561 LPAR designated for system management.
563 To compile this driver as a module, choose M here: the
564 module will be called chsc_sch.
571 prompt "SCM bus driver"
573 Bus driver for Storage Class Memory.
577 prompt "Support for EADM subchannels"
580 This driver allows usage of EADM subchannels. EADM subchannels act
581 as a communication vehicle for SCM increments.
583 To compile this driver as a module, choose M here: the
584 module will be called eadm_sch.
591 bool "kernel crash dumps"
592 depends on 64BIT && SMP
596 Generate crash dump after being started by kexec.
597 Crash dump kernels are loaded in the main kernel with kexec-tools
598 into a specially reserved region and then later executed after
599 a crash by kdump/kexec.
600 For more details see Documentation/kdump/kdump.txt
604 prompt "zfcpdump support"
605 depends on 64BIT && SMP
607 Select this option if you want to build an zfcpdump enabled kernel.
608 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
612 menu "Executable file formats / Emulations"
614 source "fs/Kconfig.binfmt"
618 prompt "Enable seccomp to safely compute untrusted bytecode"
621 This kernel feature is useful for number crunching applications
622 that may need to compute untrusted bytecode during their
623 execution. By using pipes or other transports made available to
624 the process as file descriptors supporting the read/write
625 syscalls, it's possible to isolate those applications in
626 their own address space using seccomp. Once seccomp is
627 enabled via /proc/<pid>/seccomp, it cannot be disabled
628 and the task is only allowed to execute a few safe syscalls
629 defined by each seccomp mode.
635 menu "Power Management"
637 config ARCH_HIBERNATION_POSSIBLE
640 source "kernel/power/Kconfig"
652 source "drivers/Kconfig"
656 source "arch/s390/Kconfig.debug"
658 source "security/Kconfig"
660 source "crypto/Kconfig"
664 menu "Virtualization"
668 prompt "Pseudo page fault support"
670 Select this option, if you want to use PFAULT pseudo page fault
671 handling under VM. If running native or in LPAR, this option
672 has no effect. If your VM does not support PFAULT, PAGEEX
673 pseudo page fault handling will be used.
674 Note that VM 4.2 supports PFAULT but has a bug in its
675 implementation that causes some problems.
676 Everybody who wants to run Linux under VM != VM4.2 should select
680 bool "VM shared kernel support"
681 depends on !JUMP_LABEL
683 Select this option, if you want to share the text segment of the
684 Linux kernel between different VM guests. This reduces memory
685 usage with lots of guests but greatly increases kernel size.
686 Also if a kernel was IPL'ed from a shared segment the kexec system
688 You should only select this option if you know what you are
689 doing and want to exploit this feature.
693 prompt "Cooperative memory management"
695 Select this option, if you want to enable the kernel interface
696 to reduce the memory size of the system. This is accomplished
697 by allocating pages of memory and put them "on hold". This only
698 makes sense for a system running under VM where the unused pages
699 will be reused by VM for other guest systems. The interface
700 allows an external monitor to balance memory of many systems.
701 Everybody who wants to run Linux under VM should select this
706 prompt "IUCV special message interface to cooperative memory management"
707 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
709 Select this option to enable the special message interface to
710 the cooperative memory management.
714 prompt "Linux - VM Monitor Stream, base infrastructure"
717 This provides a kernel interface for creating and updating z/VM APPLDATA
718 monitor records. The monitor records are updated at certain time
719 intervals, once the timer is started.
720 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
721 i.e. enables or disables monitoring on the Linux side.
722 A custom interval value (in seconds) can be written to
723 /proc/appldata/interval.
725 Defaults are 60 seconds interval and timer off.
726 The /proc entries can also be read from, showing the current settings.
730 prompt "Monitor memory management statistics"
731 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
733 This provides memory management related data to the Linux - VM Monitor
734 Stream, like paging/swapping rate, memory utilisation, etc.
735 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
736 APPLDATA monitor record, i.e. enables or disables monitoring this record
740 The /proc entry can also be read from, showing the current settings.
742 This can also be compiled as a module, which will be called
747 prompt "Monitor OS statistics"
748 depends on APPLDATA_BASE
750 This provides OS related data to the Linux - VM Monitor Stream, like
751 CPU utilisation, etc.
752 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
753 APPLDATA monitor record, i.e. enables or disables monitoring this record
757 This can also be compiled as a module, which will be called
760 config APPLDATA_NET_SUM
762 prompt "Monitor overall network statistics"
763 depends on APPLDATA_BASE && NET
765 This provides network related data to the Linux - VM Monitor Stream,
766 currently there is only a total sum of network I/O statistics, no
768 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
769 APPLDATA monitor record, i.e. enables or disables monitoring this record
773 This can also be compiled as a module, which will be called
778 prompt "s390 hypervisor file system support"
779 select SYS_HYPERVISOR
781 This is a virtual file system intended to provide accounting
782 information in an s390 hypervisor environment.
784 source "arch/s390/kvm/Kconfig"
788 prompt "s390 support for virtio devices"
791 select VIRTUALIZATION
793 select VIRTIO_CONSOLE
795 Enabling this option adds support for virtio based paravirtual device
798 Select this option if you want to run the kernel as a guest under