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 KTIME_SCALAR if 32BIT
139 select MODULES_USE_ELF_RELA
141 select OLD_SIGSUSPEND3
142 select SYSCTL_EXCEPTION_TRACE
143 select VIRT_CPU_ACCOUNTING
146 config SCHED_OMIT_FRAME_POINTER
149 source "init/Kconfig"
151 source "kernel/Kconfig.freezer"
153 menu "Processor type and features"
155 config HAVE_MARCH_Z900_FEATURES
158 config HAVE_MARCH_Z990_FEATURES
160 select HAVE_MARCH_Z900_FEATURES
162 config HAVE_MARCH_Z9_109_FEATURES
164 select HAVE_MARCH_Z990_FEATURES
166 config HAVE_MARCH_Z10_FEATURES
168 select HAVE_MARCH_Z9_109_FEATURES
170 config HAVE_MARCH_Z196_FEATURES
172 select HAVE_MARCH_Z10_FEATURES
174 config HAVE_MARCH_ZEC12_FEATURES
176 select HAVE_MARCH_Z196_FEATURES
179 prompt "Processor type"
183 bool "System/390 model G5 and G6"
186 Select this to build a 31 bit kernel that works
187 on all ESA/390 and z/Architecture machines.
190 bool "IBM zSeries model z800 and z900"
191 select HAVE_MARCH_Z900_FEATURES if 64BIT
193 Select this to enable optimizations for model z800/z900 (2064 and
194 2066 series). This will enable some optimizations that are not
195 available on older ESA/390 (31 Bit) only CPUs.
198 bool "IBM zSeries model z890 and z990"
199 select HAVE_MARCH_Z990_FEATURES if 64BIT
201 Select this to enable optimizations for model z890/z990 (2084 and
202 2086 series). The kernel will be slightly faster but will not work
207 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
209 Select this to enable optimizations for IBM System z9 (2094 and
210 2096 series). The kernel will be slightly faster but will not work
214 bool "IBM System z10"
215 select HAVE_MARCH_Z10_FEATURES if 64BIT
217 Select this to enable optimizations for IBM System z10 (2097 and
218 2098 series). The kernel will be slightly faster but will not work
222 bool "IBM zEnterprise 114 and 196"
223 select HAVE_MARCH_Z196_FEATURES if 64BIT
225 Select this to enable optimizations for IBM zEnterprise 114 and 196
226 (2818 and 2817 series). The kernel will be slightly faster but will
227 not work on older machines.
230 bool "IBM zBC12 and zEC12"
231 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
233 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
234 2827 series). The kernel will be slightly faster but will not work on
240 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
242 config MARCH_Z900_TUNE
243 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
245 config MARCH_Z990_TUNE
246 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
248 config MARCH_Z9_109_TUNE
249 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
251 config MARCH_Z10_TUNE
252 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
254 config MARCH_Z196_TUNE
255 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
257 config MARCH_ZEC12_TUNE
258 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
261 prompt "Tune code generation"
264 Cause the compiler to tune (-mtune) the generated code for a machine.
265 This will make the code run faster on the selected machine but
266 somewhat slower on other machines.
267 This option only changes how the compiler emits instructions, not the
268 selection of instructions itself, so the resulting kernel will run on
274 Tune the generated code for the target processor for which the kernel
278 bool "System/390 model G5 and G6"
281 bool "IBM zSeries model z800 and z900"
284 bool "IBM zSeries model z890 and z990"
290 bool "IBM System z10"
293 bool "IBM zEnterprise 114 and 196"
296 bool "IBM zBC12 and zEC12"
302 prompt "64 bit kernel"
304 Select this option if you have an IBM z/Architecture machine
305 and want to use the 64 bit addressing mode.
312 prompt "Kernel support for 31 bit emulation"
314 select COMPAT_BINFMT_ELF if BINFMT_ELF
315 select ARCH_WANT_OLD_COMPAT_IPC
316 select COMPAT_OLD_SIGACTION
318 Select this option if you want to enable your system kernel to
319 handle system-calls from ELF binaries for 31 bit ESA. This option
320 (and some other stuff like libraries and such) is needed for
321 executing 31 bit applications. It is safe to say "Y".
323 config SYSVIPC_COMPAT
324 def_bool y if COMPAT && SYSVIPC
327 def_bool y if COMPAT && KEYS
331 prompt "Symmetric multi-processing support"
333 This enables support for systems with more than one CPU. If you have
334 a system with only one CPU, like most personal computers, say N. If
335 you have a system with more than one CPU, say Y.
337 If you say N here, the kernel will run on uni- and multiprocessor
338 machines, but will use only one CPU of a multiprocessor machine. If
339 you say Y here, the kernel will run on many, but not all,
340 uniprocessor machines. On a uniprocessor machine, the kernel
341 will run faster if you say N here.
343 See also the SMP-HOWTO available at
344 <http://www.tldp.org/docs.html#howto>.
346 Even if you don't know what to do here, say Y.
349 int "Maximum number of CPUs (2-256)"
352 default "32" if !64BIT
353 default "64" if 64BIT
355 This allows you to specify the maximum number of CPUs which this
356 kernel will support. The maximum supported value is 256 and the
357 minimum value which makes sense is 2.
359 This is purely to save memory - each supported CPU adds
360 approximately sixteen kilobytes to the kernel image.
364 prompt "Support for hot-pluggable CPUs"
367 Say Y here to be able to turn CPUs off and on. CPUs
368 can be controlled through /sys/devices/system/cpu/cpu#.
369 Say N if you want to disable CPU hotplug.
376 prompt "Book scheduler support"
380 Book scheduler support improves the CPU scheduler's decision making
381 when dealing with machines that have several books.
383 source kernel/Kconfig.preempt
387 prompt "IEEE FPU emulation"
390 This option is required for IEEE compliant floating point arithmetic
391 on older ESA/390 machines. Say Y unless you know your machine doesn't
394 source kernel/Kconfig.hz
400 config ARCH_SPARSEMEM_ENABLE
402 select SPARSEMEM_VMEMMAP_ENABLE
403 select SPARSEMEM_VMEMMAP
404 select SPARSEMEM_STATIC if !64BIT
406 config ARCH_SPARSEMEM_DEFAULT
409 config ARCH_SELECT_MEMORY_MODEL
412 config ARCH_ENABLE_MEMORY_HOTPLUG
413 def_bool y if SPARSEMEM
415 config ARCH_ENABLE_MEMORY_HOTREMOVE
418 config FORCE_MAX_ZONEORDER
426 prompt "Pack kernel stack"
428 This option enables the compiler option -mkernel-backchain if it
429 is available. If the option is available the compiler supports
430 the new stack layout which dramatically reduces the minimum stack
431 frame size. With an old compiler a non-leaf function needs a
432 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
433 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
434 and 24 byte on 64 bit.
436 Say Y if you are unsure.
440 prompt "Detect kernel stack overflow"
442 This option enables the compiler option -mstack-guard and
443 -mstack-size if they are available. If the compiler supports them
444 it will emit additional code to each function prolog to trigger
445 an illegal operation if the kernel stack is about to overflow.
447 Say N if you are unsure.
450 int "Size of the guard area (128-1024)"
452 depends on CHECK_STACK
455 This allows you to specify the size of the guard area at the lower
456 end of the kernel stack. If the kernel stack points into the guard
457 area on function entry an illegal operation is triggered. The size
458 needs to be a power of 2. Please keep in mind that the size of an
459 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
460 The minimum size for the stack guard should be 256 for 31 bit and
463 config WARN_DYNAMIC_STACK
465 prompt "Emit compiler warnings for function with dynamic stack usage"
467 This option enables the compiler option -mwarn-dynamicstack. If the
468 compiler supports this options generates warnings for functions
469 that dynamically allocate stack space using alloca.
471 Say N if you are unsure.
479 prompt "QDIO support"
481 This driver provides the Queued Direct I/O base support for
484 To compile this driver as a module, choose M here: the
485 module will be called qdio.
499 config PCI_NR_FUNCTIONS
500 int "Maximum number of PCI functions (1-4096)"
504 This allows you to specify the maximum number of PCI functions which
505 this kernel will support.
508 int "Maximum number of MSI interrupts (64-32768)"
512 This defines the number of virtual interrupts the kernel will
513 provide for MSI interrupts. If you configure your system to have
514 too few drivers will fail to allocate MSI interrupts for all
517 source "drivers/pci/Kconfig"
518 source "drivers/pci/pcie/Kconfig"
519 source "drivers/pci/hotplug/Kconfig"
534 select HAVE_DMA_API_DEBUG
536 config NEED_SG_DMA_LENGTH
539 config HAVE_DMA_ATTRS
542 config NEED_DMA_MAP_STATE
547 prompt "Support for CHSC subchannels"
549 This driver allows usage of CHSC subchannels. A CHSC subchannel
550 is usually present on LPAR only.
551 The driver creates a device /dev/chsc, which may be used to
552 obtain I/O configuration information about the machine and
553 to issue asynchronous chsc commands (DANGEROUS).
554 You will usually only want to use this interface on a special
555 LPAR designated for system management.
557 To compile this driver as a module, choose M here: the
558 module will be called chsc_sch.
565 prompt "SCM bus driver"
567 Bus driver for Storage Class Memory.
571 prompt "Support for EADM subchannels"
574 This driver allows usage of EADM subchannels. EADM subchannels act
575 as a communication vehicle for SCM increments.
577 To compile this driver as a module, choose M here: the
578 module will be called eadm_sch.
585 bool "kernel crash dumps"
586 depends on 64BIT && SMP
590 Generate crash dump after being started by kexec.
591 Crash dump kernels are loaded in the main kernel with kexec-tools
592 into a specially reserved region and then later executed after
593 a crash by kdump/kexec.
594 For more details see Documentation/kdump/kdump.txt
598 prompt "zfcpdump support"
601 Select this option if you want to build an zfcpdump enabled kernel.
602 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
606 menu "Executable file formats / Emulations"
608 source "fs/Kconfig.binfmt"
612 prompt "Enable seccomp to safely compute untrusted bytecode"
615 This kernel feature is useful for number crunching applications
616 that may need to compute untrusted bytecode during their
617 execution. By using pipes or other transports made available to
618 the process as file descriptors supporting the read/write
619 syscalls, it's possible to isolate those applications in
620 their own address space using seccomp. Once seccomp is
621 enabled via /proc/<pid>/seccomp, it cannot be disabled
622 and the task is only allowed to execute a few safe syscalls
623 defined by each seccomp mode.
629 menu "Power Management"
631 config ARCH_HIBERNATION_POSSIBLE
634 source "kernel/power/Kconfig"
646 source "drivers/Kconfig"
650 source "arch/s390/Kconfig.debug"
652 source "security/Kconfig"
654 source "crypto/Kconfig"
658 menu "Virtualization"
662 prompt "Pseudo page fault support"
664 Select this option, if you want to use PFAULT pseudo page fault
665 handling under VM. If running native or in LPAR, this option
666 has no effect. If your VM does not support PFAULT, PAGEEX
667 pseudo page fault handling will be used.
668 Note that VM 4.2 supports PFAULT but has a bug in its
669 implementation that causes some problems.
670 Everybody who wants to run Linux under VM != VM4.2 should select
674 bool "VM shared kernel support"
675 depends on !JUMP_LABEL
677 Select this option, if you want to share the text segment of the
678 Linux kernel between different VM guests. This reduces memory
679 usage with lots of guests but greatly increases kernel size.
680 Also if a kernel was IPL'ed from a shared segment the kexec system
682 You should only select this option if you know what you are
683 doing and want to exploit this feature.
687 prompt "Cooperative memory management"
689 Select this option, if you want to enable the kernel interface
690 to reduce the memory size of the system. This is accomplished
691 by allocating pages of memory and put them "on hold". This only
692 makes sense for a system running under VM where the unused pages
693 will be reused by VM for other guest systems. The interface
694 allows an external monitor to balance memory of many systems.
695 Everybody who wants to run Linux under VM should select this
700 prompt "IUCV special message interface to cooperative memory management"
701 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
703 Select this option to enable the special message interface to
704 the cooperative memory management.
708 prompt "Linux - VM Monitor Stream, base infrastructure"
711 This provides a kernel interface for creating and updating z/VM APPLDATA
712 monitor records. The monitor records are updated at certain time
713 intervals, once the timer is started.
714 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
715 i.e. enables or disables monitoring on the Linux side.
716 A custom interval value (in seconds) can be written to
717 /proc/appldata/interval.
719 Defaults are 60 seconds interval and timer off.
720 The /proc entries can also be read from, showing the current settings.
724 prompt "Monitor memory management statistics"
725 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
727 This provides memory management related data to the Linux - VM Monitor
728 Stream, like paging/swapping rate, memory utilisation, etc.
729 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
730 APPLDATA monitor record, i.e. enables or disables monitoring this record
734 The /proc entry can also be read from, showing the current settings.
736 This can also be compiled as a module, which will be called
741 prompt "Monitor OS statistics"
742 depends on APPLDATA_BASE
744 This provides OS related data to the Linux - VM Monitor Stream, like
745 CPU utilisation, etc.
746 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
747 APPLDATA monitor record, i.e. enables or disables monitoring this record
751 This can also be compiled as a module, which will be called
754 config APPLDATA_NET_SUM
756 prompt "Monitor overall network statistics"
757 depends on APPLDATA_BASE && NET
759 This provides network related data to the Linux - VM Monitor Stream,
760 currently there is only a total sum of network I/O statistics, no
762 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
763 APPLDATA monitor record, i.e. enables or disables monitoring this record
767 This can also be compiled as a module, which will be called
772 prompt "s390 hypervisor file system support"
773 select SYS_HYPERVISOR
775 This is a virtual file system intended to provide accounting
776 information in an s390 hypervisor environment.
778 source "arch/s390/kvm/Kconfig"
782 prompt "s390 support for virtio devices"
785 select VIRTUALIZATION
787 select VIRTIO_CONSOLE
789 Enabling this option adds support for virtio based paravirtual device
792 Select this option if you want to run the kernel as a guest under