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
65 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
66 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
67 select ARCH_HAVE_NMI_SAFE_CMPXCHG
68 select ARCH_INLINE_READ_LOCK
69 select ARCH_INLINE_READ_LOCK_BH
70 select ARCH_INLINE_READ_LOCK_IRQ
71 select ARCH_INLINE_READ_LOCK_IRQSAVE
72 select ARCH_INLINE_READ_TRYLOCK
73 select ARCH_INLINE_READ_UNLOCK
74 select ARCH_INLINE_READ_UNLOCK_BH
75 select ARCH_INLINE_READ_UNLOCK_IRQ
76 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
77 select ARCH_INLINE_SPIN_LOCK
78 select ARCH_INLINE_SPIN_LOCK_BH
79 select ARCH_INLINE_SPIN_LOCK_IRQ
80 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
81 select ARCH_INLINE_SPIN_TRYLOCK
82 select ARCH_INLINE_SPIN_TRYLOCK_BH
83 select ARCH_INLINE_SPIN_UNLOCK
84 select ARCH_INLINE_SPIN_UNLOCK_BH
85 select ARCH_INLINE_SPIN_UNLOCK_IRQ
86 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
87 select ARCH_INLINE_WRITE_LOCK
88 select ARCH_INLINE_WRITE_LOCK_BH
89 select ARCH_INLINE_WRITE_LOCK_IRQ
90 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
91 select ARCH_INLINE_WRITE_TRYLOCK
92 select ARCH_INLINE_WRITE_UNLOCK
93 select ARCH_INLINE_WRITE_UNLOCK_BH
94 select ARCH_INLINE_WRITE_UNLOCK_IRQ
95 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
96 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
97 select ARCH_SUPPORTS_ATOMIC_RMW
98 select ARCH_USE_CMPXCHG_LOCKREF
99 select ARCH_WANT_IPC_PARSE_VERSION
100 select BUILDTIME_EXTABLE_SORT
101 select CLONE_BACKWARDS2
102 select GENERIC_CLOCKEVENTS
103 select GENERIC_CPU_DEVICES if !SMP
104 select GENERIC_FIND_FIRST_BIT
105 select GENERIC_SMP_IDLE_THREAD
106 select GENERIC_TIME_VSYSCALL
107 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
108 select HAVE_ARCH_AUDITSYSCALL
109 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
110 select HAVE_ARCH_SECCOMP_FILTER
111 select HAVE_ARCH_TRACEHOOK
112 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
113 select HAVE_BPF_JIT if 64BIT && PACK_STACK
114 select HAVE_CMPXCHG_DOUBLE
115 select HAVE_CMPXCHG_LOCAL
116 select HAVE_C_RECORDMCOUNT
117 select HAVE_DEBUG_KMEMLEAK
118 select HAVE_DYNAMIC_FTRACE
119 select HAVE_FTRACE_MCOUNT_RECORD
120 select HAVE_FUNCTION_GRAPH_TRACER
121 select HAVE_FUNCTION_TRACER
122 select HAVE_FUTEX_CMPXCHG if FUTEX
123 select HAVE_KERNEL_BZIP2
124 select HAVE_KERNEL_GZIP
125 select HAVE_KERNEL_LZ4
126 select HAVE_KERNEL_LZMA
127 select HAVE_KERNEL_LZO
128 select HAVE_KERNEL_XZ
130 select HAVE_KRETPROBES
131 select HAVE_KVM if 64BIT
133 select HAVE_MEMBLOCK_NODE_MAP
134 select HAVE_MEMBLOCK_PHYS_MAP
135 select HAVE_MOD_ARCH_SPECIFIC
137 select HAVE_PERF_EVENTS
138 select HAVE_REGS_AND_STACK_ACCESS_API
139 select HAVE_SYSCALL_TRACEPOINTS
140 select HAVE_UID16 if 32BIT
141 select HAVE_VIRT_CPU_ACCOUNTING
142 select MODULES_USE_ELF_RELA
145 select OLD_SIGSUSPEND3
146 select SYSCTL_EXCEPTION_TRACE
148 select VIRT_CPU_ACCOUNTING
150 select ARCH_HAS_SG_CHAIN
152 config SCHED_OMIT_FRAME_POINTER
155 source "init/Kconfig"
157 source "kernel/Kconfig.freezer"
159 menu "Processor type and features"
161 config HAVE_MARCH_Z900_FEATURES
164 config HAVE_MARCH_Z990_FEATURES
166 select HAVE_MARCH_Z900_FEATURES
168 config HAVE_MARCH_Z9_109_FEATURES
170 select HAVE_MARCH_Z990_FEATURES
172 config HAVE_MARCH_Z10_FEATURES
174 select HAVE_MARCH_Z9_109_FEATURES
176 config HAVE_MARCH_Z196_FEATURES
178 select HAVE_MARCH_Z10_FEATURES
180 config HAVE_MARCH_ZEC12_FEATURES
182 select HAVE_MARCH_Z196_FEATURES
185 prompt "Processor type"
189 bool "System/390 model G5 and G6"
192 Select this to build a 31 bit kernel that works
193 on all ESA/390 and z/Architecture machines.
196 bool "IBM zSeries model z800 and z900"
197 select HAVE_MARCH_Z900_FEATURES if 64BIT
199 Select this to enable optimizations for model z800/z900 (2064 and
200 2066 series). This will enable some optimizations that are not
201 available on older ESA/390 (31 Bit) only CPUs.
204 bool "IBM zSeries model z890 and z990"
205 select HAVE_MARCH_Z990_FEATURES if 64BIT
207 Select this to enable optimizations for model z890/z990 (2084 and
208 2086 series). The kernel will be slightly faster but will not work
213 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
215 Select this to enable optimizations for IBM System z9 (2094 and
216 2096 series). The kernel will be slightly faster but will not work
220 bool "IBM System z10"
221 select HAVE_MARCH_Z10_FEATURES if 64BIT
223 Select this to enable optimizations for IBM System z10 (2097 and
224 2098 series). The kernel will be slightly faster but will not work
228 bool "IBM zEnterprise 114 and 196"
229 select HAVE_MARCH_Z196_FEATURES if 64BIT
231 Select this to enable optimizations for IBM zEnterprise 114 and 196
232 (2818 and 2817 series). The kernel will be slightly faster but will
233 not work on older machines.
236 bool "IBM zBC12 and zEC12"
237 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
239 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
240 2827 series). The kernel will be slightly faster but will not work on
246 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
248 config MARCH_Z900_TUNE
249 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
251 config MARCH_Z990_TUNE
252 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
254 config MARCH_Z9_109_TUNE
255 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
257 config MARCH_Z10_TUNE
258 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
260 config MARCH_Z196_TUNE
261 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
263 config MARCH_ZEC12_TUNE
264 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
267 prompt "Tune code generation"
270 Cause the compiler to tune (-mtune) the generated code for a machine.
271 This will make the code run faster on the selected machine but
272 somewhat slower on other machines.
273 This option only changes how the compiler emits instructions, not the
274 selection of instructions itself, so the resulting kernel will run on
280 Tune the generated code for the target processor for which the kernel
284 bool "System/390 model G5 and G6"
287 bool "IBM zSeries model z800 and z900"
290 bool "IBM zSeries model z890 and z990"
296 bool "IBM System z10"
299 bool "IBM zEnterprise 114 and 196"
302 bool "IBM zBC12 and zEC12"
308 prompt "64 bit kernel"
310 Select this option if you have an IBM z/Architecture machine
311 and want to use the 64 bit addressing mode.
318 prompt "Kernel support for 31 bit emulation"
320 select COMPAT_BINFMT_ELF if BINFMT_ELF
321 select ARCH_WANT_OLD_COMPAT_IPC
322 select COMPAT_OLD_SIGACTION
324 Select this option if you want to enable your system kernel to
325 handle system-calls from ELF binaries for 31 bit ESA. This option
326 (and some other stuff like libraries and such) is needed for
327 executing 31 bit applications. It is safe to say "Y".
329 config SYSVIPC_COMPAT
330 def_bool y if COMPAT && SYSVIPC
333 def_bool y if COMPAT && KEYS
337 prompt "Symmetric multi-processing support"
339 This enables support for systems with more than one CPU. If you have
340 a system with only one CPU, like most personal computers, say N. If
341 you have a system with more than one CPU, say Y.
343 If you say N here, the kernel will run on uni- and multiprocessor
344 machines, but will use only one CPU of a multiprocessor machine. If
345 you say Y here, the kernel will run on many, but not all,
346 uniprocessor machines. On a uniprocessor machine, the kernel
347 will run faster if you say N here.
349 See also the SMP-HOWTO available at
350 <http://www.tldp.org/docs.html#howto>.
352 Even if you don't know what to do here, say Y.
355 int "Maximum number of CPUs (2-256)"
358 default "32" if !64BIT
359 default "64" if 64BIT
361 This allows you to specify the maximum number of CPUs which this
362 kernel will support. The maximum supported value is 256 and the
363 minimum value which makes sense is 2.
365 This is purely to save memory - each supported CPU adds
366 approximately sixteen kilobytes to the kernel image.
370 prompt "Support for hot-pluggable CPUs"
373 Say Y here to be able to turn CPUs off and on. CPUs
374 can be controlled through /sys/devices/system/cpu/cpu#.
375 Say N if you want to disable CPU hotplug.
382 prompt "Book scheduler support"
386 Book scheduler support improves the CPU scheduler's decision making
387 when dealing with machines that have several books.
389 source kernel/Kconfig.preempt
393 prompt "IEEE FPU emulation"
396 This option is required for IEEE compliant floating point arithmetic
397 on older ESA/390 machines. Say Y unless you know your machine doesn't
400 source kernel/Kconfig.hz
406 config ARCH_SPARSEMEM_ENABLE
408 select SPARSEMEM_VMEMMAP_ENABLE
409 select SPARSEMEM_VMEMMAP
410 select SPARSEMEM_STATIC if !64BIT
412 config ARCH_SPARSEMEM_DEFAULT
415 config ARCH_SELECT_MEMORY_MODEL
418 config ARCH_ENABLE_MEMORY_HOTPLUG
419 def_bool y if SPARSEMEM
421 config ARCH_ENABLE_MEMORY_HOTREMOVE
424 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
428 config FORCE_MAX_ZONEORDER
436 prompt "Pack kernel stack"
438 This option enables the compiler option -mkernel-backchain if it
439 is available. If the option is available the compiler supports
440 the new stack layout which dramatically reduces the minimum stack
441 frame size. With an old compiler a non-leaf function needs a
442 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
443 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
444 and 24 byte on 64 bit.
446 Say Y if you are unsure.
450 prompt "Detect kernel stack overflow"
452 This option enables the compiler option -mstack-guard and
453 -mstack-size if they are available. If the compiler supports them
454 it will emit additional code to each function prolog to trigger
455 an illegal operation if the kernel stack is about to overflow.
457 Say N if you are unsure.
460 int "Size of the guard area (128-1024)"
462 depends on CHECK_STACK
465 This allows you to specify the size of the guard area at the lower
466 end of the kernel stack. If the kernel stack points into the guard
467 area on function entry an illegal operation is triggered. The size
468 needs to be a power of 2. Please keep in mind that the size of an
469 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
470 The minimum size for the stack guard should be 256 for 31 bit and
473 config WARN_DYNAMIC_STACK
475 prompt "Emit compiler warnings for function with dynamic stack usage"
477 This option enables the compiler option -mwarn-dynamicstack. If the
478 compiler supports this options generates warnings for functions
479 that dynamically allocate stack space using alloca.
481 Say N if you are unsure.
489 prompt "QDIO support"
491 This driver provides the Queued Direct I/O base support for
494 To compile this driver as a module, choose M here: the
495 module will be called qdio.
509 config PCI_NR_FUNCTIONS
510 int "Maximum number of PCI functions (1-4096)"
514 This allows you to specify the maximum number of PCI functions which
515 this kernel will support.
518 int "Maximum number of MSI interrupts (64-32768)"
522 This defines the number of virtual interrupts the kernel will
523 provide for MSI interrupts. If you configure your system to have
524 too few drivers will fail to allocate MSI interrupts for all
527 source "drivers/pci/Kconfig"
528 source "drivers/pci/pcie/Kconfig"
529 source "drivers/pci/hotplug/Kconfig"
544 select HAVE_DMA_API_DEBUG
546 config NEED_SG_DMA_LENGTH
549 config HAVE_DMA_ATTRS
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