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_HAVE_NMI_SAFE_CMPXCHG
66 select ARCH_INLINE_READ_LOCK
67 select ARCH_INLINE_READ_LOCK_BH
68 select ARCH_INLINE_READ_LOCK_IRQ
69 select ARCH_INLINE_READ_LOCK_IRQSAVE
70 select ARCH_INLINE_READ_TRYLOCK
71 select ARCH_INLINE_READ_UNLOCK
72 select ARCH_INLINE_READ_UNLOCK_BH
73 select ARCH_INLINE_READ_UNLOCK_IRQ
74 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
75 select ARCH_INLINE_SPIN_LOCK
76 select ARCH_INLINE_SPIN_LOCK_BH
77 select ARCH_INLINE_SPIN_LOCK_IRQ
78 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
79 select ARCH_INLINE_SPIN_TRYLOCK
80 select ARCH_INLINE_SPIN_TRYLOCK_BH
81 select ARCH_INLINE_SPIN_UNLOCK
82 select ARCH_INLINE_SPIN_UNLOCK_BH
83 select ARCH_INLINE_SPIN_UNLOCK_IRQ
84 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_WRITE_LOCK
86 select ARCH_INLINE_WRITE_LOCK_BH
87 select ARCH_INLINE_WRITE_LOCK_IRQ
88 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
89 select ARCH_INLINE_WRITE_TRYLOCK
90 select ARCH_INLINE_WRITE_UNLOCK
91 select ARCH_INLINE_WRITE_UNLOCK_BH
92 select ARCH_INLINE_WRITE_UNLOCK_IRQ
93 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
94 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
95 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
96 select ARCH_WANT_IPC_PARSE_VERSION
97 select BUILDTIME_EXTABLE_SORT
98 select CLONE_BACKWARDS2
99 select GENERIC_CLOCKEVENTS
100 select GENERIC_CPU_DEVICES if !SMP
101 select GENERIC_SMP_IDLE_THREAD
102 select GENERIC_TIME_VSYSCALL_OLD
103 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
104 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
105 select HAVE_ARCH_MUTEX_CPU_RELAX
106 select HAVE_ARCH_SECCOMP_FILTER
107 select HAVE_ARCH_TRACEHOOK
108 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
109 select HAVE_BPF_JIT if 64BIT && PACK_STACK
110 select HAVE_CMPXCHG_DOUBLE
111 select HAVE_CMPXCHG_LOCAL
112 select HAVE_C_RECORDMCOUNT
113 select HAVE_DEBUG_KMEMLEAK
114 select HAVE_DYNAMIC_FTRACE
115 select HAVE_FTRACE_MCOUNT_RECORD
116 select HAVE_FUNCTION_GRAPH_TRACER
117 select HAVE_FUNCTION_TRACER
118 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
119 select HAVE_GENERIC_HARDIRQS
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
139 select INIT_ALL_POSSIBLE
140 select KTIME_SCALAR if 32BIT
141 select MODULES_USE_ELF_RELA
142 select OLD_SIGSUSPEND3
144 select SYSCTL_EXCEPTION_TRACE
145 select USE_GENERIC_SMP_HELPERS if SMP
146 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
243 prompt "64 bit kernel"
245 Select this option if you have an IBM z/Architecture machine
246 and want to use the 64 bit addressing mode.
253 prompt "Kernel support for 31 bit emulation"
255 select COMPAT_BINFMT_ELF if BINFMT_ELF
256 select ARCH_WANT_OLD_COMPAT_IPC
257 select COMPAT_OLD_SIGACTION
259 Select this option if you want to enable your system kernel to
260 handle system-calls from ELF binaries for 31 bit ESA. This option
261 (and some other stuff like libraries and such) is needed for
262 executing 31 bit applications. It is safe to say "Y".
264 config SYSVIPC_COMPAT
265 def_bool y if COMPAT && SYSVIPC
268 def_bool y if COMPAT && KEYS
272 prompt "Symmetric multi-processing support"
274 This enables support for systems with more than one CPU. If you have
275 a system with only one CPU, like most personal computers, say N. If
276 you have a system with more than one CPU, say Y.
278 If you say N here, the kernel will run on single and multiprocessor
279 machines, but will use only one CPU of a multiprocessor machine. If
280 you say Y here, the kernel will run on many, but not all,
281 singleprocessor machines. On a singleprocessor machine, the kernel
282 will run faster if you say N here.
284 See also the SMP-HOWTO available at
285 <http://www.tldp.org/docs.html#howto>.
287 Even if you don't know what to do here, say Y.
290 int "Maximum number of CPUs (2-64)"
293 default "32" if !64BIT
294 default "64" if 64BIT
296 This allows you to specify the maximum number of CPUs which this
297 kernel will support. The maximum supported value is 64 and the
298 minimum value which makes sense is 2.
300 This is purely to save memory - each supported CPU adds
301 approximately sixteen kilobytes to the kernel image.
305 prompt "Support for hot-pluggable CPUs"
308 Say Y here to be able to turn CPUs off and on. CPUs
309 can be controlled through /sys/devices/system/cpu/cpu#.
310 Say N if you want to disable CPU hotplug.
317 prompt "Book scheduler support"
321 Book scheduler support improves the CPU scheduler's decision making
322 when dealing with machines that have several books.
324 source kernel/Kconfig.preempt
328 prompt "IEEE FPU emulation"
331 This option is required for IEEE compliant floating point arithmetic
332 on older ESA/390 machines. Say Y unless you know your machine doesn't
335 source kernel/Kconfig.hz
341 config ARCH_SPARSEMEM_ENABLE
343 select SPARSEMEM_VMEMMAP_ENABLE
344 select SPARSEMEM_VMEMMAP
345 select SPARSEMEM_STATIC if !64BIT
347 config ARCH_SPARSEMEM_DEFAULT
350 config ARCH_SELECT_MEMORY_MODEL
353 config ARCH_ENABLE_MEMORY_HOTPLUG
354 def_bool y if SPARSEMEM
356 config ARCH_ENABLE_MEMORY_HOTREMOVE
359 config FORCE_MAX_ZONEORDER
367 prompt "Pack kernel stack"
369 This option enables the compiler option -mkernel-backchain if it
370 is available. If the option is available the compiler supports
371 the new stack layout which dramatically reduces the minimum stack
372 frame size. With an old compiler a non-leaf function needs a
373 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
374 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
375 and 24 byte on 64 bit.
377 Say Y if you are unsure.
381 prompt "Detect kernel stack overflow"
383 This option enables the compiler option -mstack-guard and
384 -mstack-size if they are available. If the compiler supports them
385 it will emit additional code to each function prolog to trigger
386 an illegal operation if the kernel stack is about to overflow.
388 Say N if you are unsure.
391 int "Size of the guard area (128-1024)"
393 depends on CHECK_STACK
396 This allows you to specify the size of the guard area at the lower
397 end of the kernel stack. If the kernel stack points into the guard
398 area on function entry an illegal operation is triggered. The size
399 needs to be a power of 2. Please keep in mind that the size of an
400 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
401 The minimum size for the stack guard should be 256 for 31 bit and
404 config WARN_DYNAMIC_STACK
406 prompt "Emit compiler warnings for function with dynamic stack usage"
408 This option enables the compiler option -mwarn-dynamicstack. If the
409 compiler supports this options generates warnings for functions
410 that dynamically allocate stack space using alloca.
412 Say N if you are unsure.
420 prompt "QDIO support"
422 This driver provides the Queued Direct I/O base support for
425 To compile this driver as a module, choose M here: the
426 module will be called qdio.
440 config PCI_NR_FUNCTIONS
441 int "Maximum number of PCI functions (1-4096)"
445 This allows you to specify the maximum number of PCI functions which
446 this kernel will support.
449 int "Maximum number of MSI interrupts (64-32768)"
453 This defines the number of virtual interrupts the kernel will
454 provide for MSI interrupts. If you configure your system to have
455 too few drivers will fail to allocate MSI interrupts for all
458 source "drivers/pci/Kconfig"
459 source "drivers/pci/pcie/Kconfig"
460 source "drivers/pci/hotplug/Kconfig"
475 select HAVE_DMA_API_DEBUG
477 config NEED_SG_DMA_LENGTH
480 config HAVE_DMA_ATTRS
483 config NEED_DMA_MAP_STATE
488 prompt "Support for CHSC subchannels"
490 This driver allows usage of CHSC subchannels. A CHSC subchannel
491 is usually present on LPAR only.
492 The driver creates a device /dev/chsc, which may be used to
493 obtain I/O configuration information about the machine and
494 to issue asynchronous chsc commands (DANGEROUS).
495 You will usually only want to use this interface on a special
496 LPAR designated for system management.
498 To compile this driver as a module, choose M here: the
499 module will be called chsc_sch.
506 prompt "SCM bus driver"
508 Bus driver for Storage Class Memory.
512 prompt "Support for EADM subchannels"
515 This driver allows usage of EADM subchannels. EADM subchannels act
516 as a communication vehicle for SCM increments.
518 To compile this driver as a module, choose M here: the
519 module will be called eadm_sch.
526 bool "kernel crash dumps"
527 depends on 64BIT && SMP
530 Generate crash dump after being started by kexec.
531 Crash dump kernels are loaded in the main kernel with kexec-tools
532 into a specially reserved region and then later executed after
533 a crash by kdump/kexec.
534 For more details see Documentation/kdump/kdump.txt
538 prompt "zfcpdump support"
541 Select this option if you want to build an zfcpdump enabled kernel.
542 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
546 menu "Executable file formats / Emulations"
548 source "fs/Kconfig.binfmt"
552 prompt "Enable seccomp to safely compute untrusted bytecode"
555 This kernel feature is useful for number crunching applications
556 that may need to compute untrusted bytecode during their
557 execution. By using pipes or other transports made available to
558 the process as file descriptors supporting the read/write
559 syscalls, it's possible to isolate those applications in
560 their own address space using seccomp. Once seccomp is
561 enabled via /proc/<pid>/seccomp, it cannot be disabled
562 and the task is only allowed to execute a few safe syscalls
563 defined by each seccomp mode.
569 menu "Power Management"
571 config ARCH_HIBERNATION_POSSIBLE
574 source "kernel/power/Kconfig"
586 source "drivers/Kconfig"
590 source "arch/s390/Kconfig.debug"
592 source "security/Kconfig"
594 source "crypto/Kconfig"
598 menu "Virtualization"
602 prompt "Pseudo page fault support"
604 Select this option, if you want to use PFAULT pseudo page fault
605 handling under VM. If running native or in LPAR, this option
606 has no effect. If your VM does not support PFAULT, PAGEEX
607 pseudo page fault handling will be used.
608 Note that VM 4.2 supports PFAULT but has a bug in its
609 implementation that causes some problems.
610 Everybody who wants to run Linux under VM != VM4.2 should select
614 bool "VM shared kernel support"
615 depends on !JUMP_LABEL
617 Select this option, if you want to share the text segment of the
618 Linux kernel between different VM guests. This reduces memory
619 usage with lots of guests but greatly increases kernel size.
620 Also if a kernel was IPL'ed from a shared segment the kexec system
622 You should only select this option if you know what you are
623 doing and want to exploit this feature.
627 prompt "Cooperative memory management"
629 Select this option, if you want to enable the kernel interface
630 to reduce the memory size of the system. This is accomplished
631 by allocating pages of memory and put them "on hold". This only
632 makes sense for a system running under VM where the unused pages
633 will be reused by VM for other guest systems. The interface
634 allows an external monitor to balance memory of many systems.
635 Everybody who wants to run Linux under VM should select this
640 prompt "IUCV special message interface to cooperative memory management"
641 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
643 Select this option to enable the special message interface to
644 the cooperative memory management.
648 prompt "Linux - VM Monitor Stream, base infrastructure"
651 This provides a kernel interface for creating and updating z/VM APPLDATA
652 monitor records. The monitor records are updated at certain time
653 intervals, once the timer is started.
654 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
655 i.e. enables or disables monitoring on the Linux side.
656 A custom interval value (in seconds) can be written to
657 /proc/appldata/interval.
659 Defaults are 60 seconds interval and timer off.
660 The /proc entries can also be read from, showing the current settings.
664 prompt "Monitor memory management statistics"
665 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
667 This provides memory management related data to the Linux - VM Monitor
668 Stream, like paging/swapping rate, memory utilisation, etc.
669 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
670 APPLDATA monitor record, i.e. enables or disables monitoring this record
674 The /proc entry can also be read from, showing the current settings.
676 This can also be compiled as a module, which will be called
681 prompt "Monitor OS statistics"
682 depends on APPLDATA_BASE
684 This provides OS related data to the Linux - VM Monitor Stream, like
685 CPU utilisation, etc.
686 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
687 APPLDATA monitor record, i.e. enables or disables monitoring this record
691 This can also be compiled as a module, which will be called
694 config APPLDATA_NET_SUM
696 prompt "Monitor overall network statistics"
697 depends on APPLDATA_BASE && NET
699 This provides network related data to the Linux - VM Monitor Stream,
700 currently there is only a total sum of network I/O statistics, no
702 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
703 APPLDATA monitor record, i.e. enables or disables monitoring this record
707 This can also be compiled as a module, which will be called
712 prompt "s390 hypervisor file system support"
713 select SYS_HYPERVISOR
715 This is a virtual file system intended to provide accounting
716 information in an s390 hypervisor environment.
718 source "arch/s390/kvm/Kconfig"
722 prompt "s390 support for virtio devices"
725 select VIRTUALIZATION
727 select VIRTIO_CONSOLE
729 Enabling this option adds support for virtio based paravirtual device
732 Select this option if you want to run the kernel as a guest under