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
61 config ARCH_SUPPORTS_UPROBES
66 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
67 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
68 select ARCH_HAVE_NMI_SAFE_CMPXCHG
69 select ARCH_INLINE_READ_LOCK
70 select ARCH_INLINE_READ_LOCK_BH
71 select ARCH_INLINE_READ_LOCK_IRQ
72 select ARCH_INLINE_READ_LOCK_IRQSAVE
73 select ARCH_INLINE_READ_TRYLOCK
74 select ARCH_INLINE_READ_UNLOCK
75 select ARCH_INLINE_READ_UNLOCK_BH
76 select ARCH_INLINE_READ_UNLOCK_IRQ
77 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
78 select ARCH_INLINE_SPIN_LOCK
79 select ARCH_INLINE_SPIN_LOCK_BH
80 select ARCH_INLINE_SPIN_LOCK_IRQ
81 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
82 select ARCH_INLINE_SPIN_TRYLOCK
83 select ARCH_INLINE_SPIN_TRYLOCK_BH
84 select ARCH_INLINE_SPIN_UNLOCK
85 select ARCH_INLINE_SPIN_UNLOCK_BH
86 select ARCH_INLINE_SPIN_UNLOCK_IRQ
87 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
88 select ARCH_INLINE_WRITE_LOCK
89 select ARCH_INLINE_WRITE_LOCK_BH
90 select ARCH_INLINE_WRITE_LOCK_IRQ
91 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
92 select ARCH_INLINE_WRITE_TRYLOCK
93 select ARCH_INLINE_WRITE_UNLOCK
94 select ARCH_INLINE_WRITE_UNLOCK_BH
95 select ARCH_INLINE_WRITE_UNLOCK_IRQ
96 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
97 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
98 select ARCH_SUPPORTS_ATOMIC_RMW
99 select ARCH_USE_CMPXCHG_LOCKREF
100 select ARCH_WANT_IPC_PARSE_VERSION
101 select BUILDTIME_EXTABLE_SORT
102 select CLONE_BACKWARDS2
103 select DYNAMIC_FTRACE if FUNCTION_TRACER
104 select GENERIC_CLOCKEVENTS
105 select GENERIC_CPU_DEVICES if !SMP
106 select GENERIC_FIND_FIRST_BIT
107 select GENERIC_SMP_IDLE_THREAD
108 select GENERIC_TIME_VSYSCALL
109 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
110 select HAVE_ARCH_AUDITSYSCALL
111 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
112 select HAVE_ARCH_SECCOMP_FILTER
113 select HAVE_ARCH_TRACEHOOK
114 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
115 select HAVE_BPF_JIT if 64BIT && PACK_STACK
116 select HAVE_CMPXCHG_DOUBLE
117 select HAVE_CMPXCHG_LOCAL
118 select HAVE_C_RECORDMCOUNT
119 select HAVE_DEBUG_KMEMLEAK
120 select HAVE_DYNAMIC_FTRACE if 64BIT
121 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
122 select HAVE_FTRACE_MCOUNT_RECORD
123 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
124 select HAVE_FUNCTION_TRACER if 64BIT
125 select HAVE_FUTEX_CMPXCHG if FUTEX
126 select HAVE_KERNEL_BZIP2
127 select HAVE_KERNEL_GZIP
128 select HAVE_KERNEL_LZ4
129 select HAVE_KERNEL_LZMA
130 select HAVE_KERNEL_LZO
131 select HAVE_KERNEL_XZ
133 select HAVE_KRETPROBES
134 select HAVE_KVM if 64BIT
136 select HAVE_MEMBLOCK_NODE_MAP
137 select HAVE_MEMBLOCK_PHYS_MAP
138 select HAVE_MOD_ARCH_SPECIFIC
140 select HAVE_PERF_EVENTS
141 select HAVE_REGS_AND_STACK_ACCESS_API
142 select HAVE_SYSCALL_TRACEPOINTS
143 select HAVE_UID16 if 32BIT
144 select HAVE_VIRT_CPU_ACCOUNTING
145 select MODULES_USE_ELF_RELA
148 select OLD_SIGSUSPEND3
149 select SYSCTL_EXCEPTION_TRACE
151 select VIRT_CPU_ACCOUNTING
153 select ARCH_HAS_SG_CHAIN
155 config SCHED_OMIT_FRAME_POINTER
158 source "init/Kconfig"
160 source "kernel/Kconfig.freezer"
162 menu "Processor type and features"
164 config HAVE_MARCH_Z900_FEATURES
167 config HAVE_MARCH_Z990_FEATURES
169 select HAVE_MARCH_Z900_FEATURES
171 config HAVE_MARCH_Z9_109_FEATURES
173 select HAVE_MARCH_Z990_FEATURES
175 config HAVE_MARCH_Z10_FEATURES
177 select HAVE_MARCH_Z9_109_FEATURES
179 config HAVE_MARCH_Z196_FEATURES
181 select HAVE_MARCH_Z10_FEATURES
183 config HAVE_MARCH_ZEC12_FEATURES
185 select HAVE_MARCH_Z196_FEATURES
188 prompt "Processor type"
192 bool "System/390 model G5 and G6"
195 Select this to build a 31 bit kernel that works
196 on all ESA/390 and z/Architecture machines.
199 bool "IBM zSeries model z800 and z900"
200 select HAVE_MARCH_Z900_FEATURES if 64BIT
202 Select this to enable optimizations for model z800/z900 (2064 and
203 2066 series). This will enable some optimizations that are not
204 available on older ESA/390 (31 Bit) only CPUs.
207 bool "IBM zSeries model z890 and z990"
208 select HAVE_MARCH_Z990_FEATURES if 64BIT
210 Select this to enable optimizations for model z890/z990 (2084 and
211 2086 series). The kernel will be slightly faster but will not work
216 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
218 Select this to enable optimizations for IBM System z9 (2094 and
219 2096 series). The kernel will be slightly faster but will not work
223 bool "IBM System z10"
224 select HAVE_MARCH_Z10_FEATURES if 64BIT
226 Select this to enable optimizations for IBM System z10 (2097 and
227 2098 series). The kernel will be slightly faster but will not work
231 bool "IBM zEnterprise 114 and 196"
232 select HAVE_MARCH_Z196_FEATURES if 64BIT
234 Select this to enable optimizations for IBM zEnterprise 114 and 196
235 (2818 and 2817 series). The kernel will be slightly faster but will
236 not work on older machines.
239 bool "IBM zBC12 and zEC12"
240 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
242 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
243 2827 series). The kernel will be slightly faster but will not work on
249 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
251 config MARCH_Z900_TUNE
252 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
254 config MARCH_Z990_TUNE
255 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
257 config MARCH_Z9_109_TUNE
258 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
260 config MARCH_Z10_TUNE
261 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
263 config MARCH_Z196_TUNE
264 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
266 config MARCH_ZEC12_TUNE
267 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
270 prompt "Tune code generation"
273 Cause the compiler to tune (-mtune) the generated code for a machine.
274 This will make the code run faster on the selected machine but
275 somewhat slower on other machines.
276 This option only changes how the compiler emits instructions, not the
277 selection of instructions itself, so the resulting kernel will run on
283 Tune the generated code for the target processor for which the kernel
287 bool "System/390 model G5 and G6"
290 bool "IBM zSeries model z800 and z900"
293 bool "IBM zSeries model z890 and z990"
299 bool "IBM System z10"
302 bool "IBM zEnterprise 114 and 196"
305 bool "IBM zBC12 and zEC12"
311 prompt "64 bit kernel"
313 Select this option if you have an IBM z/Architecture machine
314 and want to use the 64 bit addressing mode.
321 prompt "Kernel support for 31 bit emulation"
323 select COMPAT_BINFMT_ELF if BINFMT_ELF
324 select ARCH_WANT_OLD_COMPAT_IPC
325 select COMPAT_OLD_SIGACTION
327 Select this option if you want to enable your system kernel to
328 handle system-calls from ELF binaries for 31 bit ESA. This option
329 (and some other stuff like libraries and such) is needed for
330 executing 31 bit applications. It is safe to say "Y".
332 config SYSVIPC_COMPAT
333 def_bool y if COMPAT && SYSVIPC
336 def_bool y if COMPAT && KEYS
340 prompt "Symmetric multi-processing support"
342 This enables support for systems with more than one CPU. If you have
343 a system with only one CPU, like most personal computers, say N. If
344 you have a system with more than one CPU, say Y.
346 If you say N here, the kernel will run on uni- and multiprocessor
347 machines, but will use only one CPU of a multiprocessor machine. If
348 you say Y here, the kernel will run on many, but not all,
349 uniprocessor machines. On a uniprocessor machine, the kernel
350 will run faster if you say N here.
352 See also the SMP-HOWTO available at
353 <http://www.tldp.org/docs.html#howto>.
355 Even if you don't know what to do here, say Y.
358 int "Maximum number of CPUs (2-256)"
361 default "32" if !64BIT
362 default "64" if 64BIT
364 This allows you to specify the maximum number of CPUs which this
365 kernel will support. The maximum supported value is 256 and the
366 minimum value which makes sense is 2.
368 This is purely to save memory - each supported CPU adds
369 approximately sixteen kilobytes to the kernel image.
373 prompt "Support for hot-pluggable CPUs"
376 Say Y here to be able to turn CPUs off and on. CPUs
377 can be controlled through /sys/devices/system/cpu/cpu#.
378 Say N if you want to disable CPU hotplug.
385 prompt "Book scheduler support"
389 Book scheduler support improves the CPU scheduler's decision making
390 when dealing with machines that have several books.
392 source kernel/Kconfig.preempt
396 prompt "IEEE FPU emulation"
399 This option is required for IEEE compliant floating point arithmetic
400 on older ESA/390 machines. Say Y unless you know your machine doesn't
403 source kernel/Kconfig.hz
409 config ARCH_SPARSEMEM_ENABLE
411 select SPARSEMEM_VMEMMAP_ENABLE
412 select SPARSEMEM_VMEMMAP
413 select SPARSEMEM_STATIC if !64BIT
415 config ARCH_SPARSEMEM_DEFAULT
418 config ARCH_SELECT_MEMORY_MODEL
421 config ARCH_ENABLE_MEMORY_HOTPLUG
422 def_bool y if SPARSEMEM
424 config ARCH_ENABLE_MEMORY_HOTREMOVE
427 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
431 config FORCE_MAX_ZONEORDER
439 prompt "Pack kernel stack"
441 This option enables the compiler option -mkernel-backchain if it
442 is available. If the option is available the compiler supports
443 the new stack layout which dramatically reduces the minimum stack
444 frame size. With an old compiler a non-leaf function needs a
445 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
446 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
447 and 24 byte on 64 bit.
449 Say Y if you are unsure.
453 prompt "Detect kernel stack overflow"
455 This option enables the compiler option -mstack-guard and
456 -mstack-size if they are available. If the compiler supports them
457 it will emit additional code to each function prolog to trigger
458 an illegal operation if the kernel stack is about to overflow.
460 Say N if you are unsure.
463 int "Size of the guard area (128-1024)"
465 depends on CHECK_STACK
468 This allows you to specify the size of the guard area at the lower
469 end of the kernel stack. If the kernel stack points into the guard
470 area on function entry an illegal operation is triggered. The size
471 needs to be a power of 2. Please keep in mind that the size of an
472 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
473 The minimum size for the stack guard should be 256 for 31 bit and
476 config WARN_DYNAMIC_STACK
478 prompt "Emit compiler warnings for function with dynamic stack usage"
480 This option enables the compiler option -mwarn-dynamicstack. If the
481 compiler supports this options generates warnings for functions
482 that dynamically allocate stack space using alloca.
484 Say N if you are unsure.
492 prompt "QDIO support"
494 This driver provides the Queued Direct I/O base support for
497 To compile this driver as a module, choose M here: the
498 module will be called qdio.
505 select HAVE_DMA_ATTRS
512 config PCI_NR_FUNCTIONS
513 int "Maximum number of PCI functions (1-4096)"
517 This allows you to specify the maximum number of PCI functions which
518 this kernel will support.
521 int "Maximum number of MSI interrupts (64-32768)"
525 This defines the number of virtual interrupts the kernel will
526 provide for MSI interrupts. If you configure your system to have
527 too few drivers will fail to allocate MSI interrupts for all
530 source "drivers/pci/Kconfig"
531 source "drivers/pci/pcie/Kconfig"
532 source "drivers/pci/hotplug/Kconfig"
547 select HAVE_DMA_API_DEBUG
549 config NEED_SG_DMA_LENGTH
552 config NEED_DMA_MAP_STATE
557 prompt "Support for CHSC subchannels"
559 This driver allows usage of CHSC subchannels. A CHSC subchannel
560 is usually present on LPAR only.
561 The driver creates a device /dev/chsc, which may be used to
562 obtain I/O configuration information about the machine and
563 to issue asynchronous chsc commands (DANGEROUS).
564 You will usually only want to use this interface on a special
565 LPAR designated for system management.
567 To compile this driver as a module, choose M here: the
568 module will be called chsc_sch.
575 prompt "SCM bus driver"
577 Bus driver for Storage Class Memory.
581 prompt "Support for EADM subchannels"
584 This driver allows usage of EADM subchannels. EADM subchannels act
585 as a communication vehicle for SCM increments.
587 To compile this driver as a module, choose M here: the
588 module will be called eadm_sch.
595 bool "kernel crash dumps"
596 depends on 64BIT && SMP
599 Generate crash dump after being started by kexec.
600 Crash dump kernels are loaded in the main kernel with kexec-tools
601 into a specially reserved region and then later executed after
602 a crash by kdump/kexec.
603 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
604 This option also enables s390 zfcpdump.
605 See also <file:Documentation/s390/zfcpdump.txt>
609 menu "Executable file formats / Emulations"
611 source "fs/Kconfig.binfmt"
615 prompt "Enable seccomp to safely compute untrusted bytecode"
618 This kernel feature is useful for number crunching applications
619 that may need to compute untrusted bytecode during their
620 execution. By using pipes or other transports made available to
621 the process as file descriptors supporting the read/write
622 syscalls, it's possible to isolate those applications in
623 their own address space using seccomp. Once seccomp is
624 enabled via /proc/<pid>/seccomp, it cannot be disabled
625 and the task is only allowed to execute a few safe syscalls
626 defined by each seccomp mode.
632 menu "Power Management"
634 config ARCH_HIBERNATION_POSSIBLE
637 source "kernel/power/Kconfig"
649 source "drivers/Kconfig"
653 source "arch/s390/Kconfig.debug"
655 source "security/Kconfig"
657 source "crypto/Kconfig"
661 menu "Virtualization"
665 prompt "Pseudo page fault support"
667 Select this option, if you want to use PFAULT pseudo page fault
668 handling under VM. If running native or in LPAR, this option
669 has no effect. If your VM does not support PFAULT, PAGEEX
670 pseudo page fault handling will be used.
671 Note that VM 4.2 supports PFAULT but has a bug in its
672 implementation that causes some problems.
673 Everybody who wants to run Linux under VM != VM4.2 should select
677 bool "VM shared kernel support"
678 depends on !JUMP_LABEL
680 Select this option, if you want to share the text segment of the
681 Linux kernel between different VM guests. This reduces memory
682 usage with lots of guests but greatly increases kernel size.
683 Also if a kernel was IPL'ed from a shared segment the kexec system
685 You should only select this option if you know what you are
686 doing and want to exploit this feature.
690 prompt "Cooperative memory management"
692 Select this option, if you want to enable the kernel interface
693 to reduce the memory size of the system. This is accomplished
694 by allocating pages of memory and put them "on hold". This only
695 makes sense for a system running under VM where the unused pages
696 will be reused by VM for other guest systems. The interface
697 allows an external monitor to balance memory of many systems.
698 Everybody who wants to run Linux under VM should select this
703 prompt "IUCV special message interface to cooperative memory management"
704 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
706 Select this option to enable the special message interface to
707 the cooperative memory management.
711 prompt "Linux - VM Monitor Stream, base infrastructure"
714 This provides a kernel interface for creating and updating z/VM APPLDATA
715 monitor records. The monitor records are updated at certain time
716 intervals, once the timer is started.
717 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
718 i.e. enables or disables monitoring on the Linux side.
719 A custom interval value (in seconds) can be written to
720 /proc/appldata/interval.
722 Defaults are 60 seconds interval and timer off.
723 The /proc entries can also be read from, showing the current settings.
727 prompt "Monitor memory management statistics"
728 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
730 This provides memory management related data to the Linux - VM Monitor
731 Stream, like paging/swapping rate, memory utilisation, etc.
732 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
733 APPLDATA monitor record, i.e. enables or disables monitoring this record
737 The /proc entry can also be read from, showing the current settings.
739 This can also be compiled as a module, which will be called
744 prompt "Monitor OS statistics"
745 depends on APPLDATA_BASE
747 This provides OS related data to the Linux - VM Monitor Stream, like
748 CPU utilisation, etc.
749 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
750 APPLDATA monitor record, i.e. enables or disables monitoring this record
754 This can also be compiled as a module, which will be called
757 config APPLDATA_NET_SUM
759 prompt "Monitor overall network statistics"
760 depends on APPLDATA_BASE && NET
762 This provides network related data to the Linux - VM Monitor Stream,
763 currently there is only a total sum of network I/O statistics, no
765 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
766 APPLDATA monitor record, i.e. enables or disables monitoring this record
770 This can also be compiled as a module, which will be called
775 prompt "s390 hypervisor file system support"
776 select SYS_HYPERVISOR
778 This is a virtual file system intended to provide accounting
779 information in an s390 hypervisor environment.
781 source "arch/s390/kvm/Kconfig"
785 prompt "s390 support for virtio devices"
788 select VIRTUALIZATION
790 select VIRTIO_CONSOLE
792 Enabling this option adds support for virtio based paravirtual device
795 Select this option if you want to run the kernel as a guest under