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_SUPPORTS_ATOMIC_RMW
97 select ARCH_USE_CMPXCHG_LOCKREF
98 select ARCH_WANT_IPC_PARSE_VERSION
99 select BUILDTIME_EXTABLE_SORT
100 select CLONE_BACKWARDS2
101 select GENERIC_CLOCKEVENTS
102 select GENERIC_CPU_DEVICES if !SMP
103 select GENERIC_FIND_FIRST_BIT
104 select GENERIC_SMP_IDLE_THREAD
105 select GENERIC_TIME_VSYSCALL
106 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
107 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
108 select HAVE_ARCH_SECCOMP_FILTER
109 select HAVE_ARCH_TRACEHOOK
110 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
111 select HAVE_BPF_JIT if 64BIT && PACK_STACK
112 select HAVE_CMPXCHG_DOUBLE
113 select HAVE_CMPXCHG_LOCAL
114 select HAVE_C_RECORDMCOUNT
115 select HAVE_DEBUG_KMEMLEAK
116 select HAVE_DYNAMIC_FTRACE
117 select HAVE_FTRACE_MCOUNT_RECORD
118 select HAVE_FUNCTION_GRAPH_TRACER
119 select HAVE_FUNCTION_TRACER
120 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
121 select HAVE_FUTEX_CMPXCHG if FUTEX
122 select HAVE_KERNEL_BZIP2
123 select HAVE_KERNEL_GZIP
124 select HAVE_KERNEL_LZ4
125 select HAVE_KERNEL_LZMA
126 select HAVE_KERNEL_LZO
127 select HAVE_KERNEL_XZ
129 select HAVE_KRETPROBES
130 select HAVE_KVM if 64BIT
132 select HAVE_MEMBLOCK_NODE_MAP
133 select HAVE_MOD_ARCH_SPECIFIC
135 select HAVE_PERF_EVENTS
136 select HAVE_REGS_AND_STACK_ACCESS_API
137 select HAVE_SYSCALL_TRACEPOINTS
138 select HAVE_UID16 if 32BIT
139 select HAVE_VIRT_CPU_ACCOUNTING
140 select KTIME_SCALAR if 32BIT
141 select MODULES_USE_ELF_RELA
143 select OLD_SIGSUSPEND3
144 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 FORCE_MAX_ZONEORDER
428 prompt "Pack kernel stack"
430 This option enables the compiler option -mkernel-backchain if it
431 is available. If the option is available the compiler supports
432 the new stack layout which dramatically reduces the minimum stack
433 frame size. With an old compiler a non-leaf function needs a
434 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
435 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
436 and 24 byte on 64 bit.
438 Say Y if you are unsure.
442 prompt "Detect kernel stack overflow"
444 This option enables the compiler option -mstack-guard and
445 -mstack-size if they are available. If the compiler supports them
446 it will emit additional code to each function prolog to trigger
447 an illegal operation if the kernel stack is about to overflow.
449 Say N if you are unsure.
452 int "Size of the guard area (128-1024)"
454 depends on CHECK_STACK
457 This allows you to specify the size of the guard area at the lower
458 end of the kernel stack. If the kernel stack points into the guard
459 area on function entry an illegal operation is triggered. The size
460 needs to be a power of 2. Please keep in mind that the size of an
461 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
462 The minimum size for the stack guard should be 256 for 31 bit and
465 config WARN_DYNAMIC_STACK
467 prompt "Emit compiler warnings for function with dynamic stack usage"
469 This option enables the compiler option -mwarn-dynamicstack. If the
470 compiler supports this options generates warnings for functions
471 that dynamically allocate stack space using alloca.
473 Say N if you are unsure.
481 prompt "QDIO support"
483 This driver provides the Queued Direct I/O base support for
486 To compile this driver as a module, choose M here: the
487 module will be called qdio.
501 config PCI_NR_FUNCTIONS
502 int "Maximum number of PCI functions (1-4096)"
506 This allows you to specify the maximum number of PCI functions which
507 this kernel will support.
510 int "Maximum number of MSI interrupts (64-32768)"
514 This defines the number of virtual interrupts the kernel will
515 provide for MSI interrupts. If you configure your system to have
516 too few drivers will fail to allocate MSI interrupts for all
519 source "drivers/pci/Kconfig"
520 source "drivers/pci/pcie/Kconfig"
521 source "drivers/pci/hotplug/Kconfig"
536 select HAVE_DMA_API_DEBUG
538 config NEED_SG_DMA_LENGTH
541 config HAVE_DMA_ATTRS
544 config NEED_DMA_MAP_STATE
549 prompt "Support for CHSC subchannels"
551 This driver allows usage of CHSC subchannels. A CHSC subchannel
552 is usually present on LPAR only.
553 The driver creates a device /dev/chsc, which may be used to
554 obtain I/O configuration information about the machine and
555 to issue asynchronous chsc commands (DANGEROUS).
556 You will usually only want to use this interface on a special
557 LPAR designated for system management.
559 To compile this driver as a module, choose M here: the
560 module will be called chsc_sch.
567 prompt "SCM bus driver"
569 Bus driver for Storage Class Memory.
573 prompt "Support for EADM subchannels"
576 This driver allows usage of EADM subchannels. EADM subchannels act
577 as a communication vehicle for SCM increments.
579 To compile this driver as a module, choose M here: the
580 module will be called eadm_sch.
587 bool "kernel crash dumps"
588 depends on 64BIT && SMP
592 Generate crash dump after being started by kexec.
593 Crash dump kernels are loaded in the main kernel with kexec-tools
594 into a specially reserved region and then later executed after
595 a crash by kdump/kexec.
596 For more details see Documentation/kdump/kdump.txt
600 prompt "zfcpdump support"
601 depends on 64BIT && SMP
603 Select this option if you want to build an zfcpdump enabled kernel.
604 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
608 menu "Executable file formats / Emulations"
610 source "fs/Kconfig.binfmt"
614 prompt "Enable seccomp to safely compute untrusted bytecode"
617 This kernel feature is useful for number crunching applications
618 that may need to compute untrusted bytecode during their
619 execution. By using pipes or other transports made available to
620 the process as file descriptors supporting the read/write
621 syscalls, it's possible to isolate those applications in
622 their own address space using seccomp. Once seccomp is
623 enabled via /proc/<pid>/seccomp, it cannot be disabled
624 and the task is only allowed to execute a few safe syscalls
625 defined by each seccomp mode.
631 menu "Power Management"
633 config ARCH_HIBERNATION_POSSIBLE
636 source "kernel/power/Kconfig"
648 source "drivers/Kconfig"
652 source "arch/s390/Kconfig.debug"
654 source "security/Kconfig"
656 source "crypto/Kconfig"
660 menu "Virtualization"
664 prompt "Pseudo page fault support"
666 Select this option, if you want to use PFAULT pseudo page fault
667 handling under VM. If running native or in LPAR, this option
668 has no effect. If your VM does not support PFAULT, PAGEEX
669 pseudo page fault handling will be used.
670 Note that VM 4.2 supports PFAULT but has a bug in its
671 implementation that causes some problems.
672 Everybody who wants to run Linux under VM != VM4.2 should select
676 bool "VM shared kernel support"
677 depends on !JUMP_LABEL
679 Select this option, if you want to share the text segment of the
680 Linux kernel between different VM guests. This reduces memory
681 usage with lots of guests but greatly increases kernel size.
682 Also if a kernel was IPL'ed from a shared segment the kexec system
684 You should only select this option if you know what you are
685 doing and want to exploit this feature.
689 prompt "Cooperative memory management"
691 Select this option, if you want to enable the kernel interface
692 to reduce the memory size of the system. This is accomplished
693 by allocating pages of memory and put them "on hold". This only
694 makes sense for a system running under VM where the unused pages
695 will be reused by VM for other guest systems. The interface
696 allows an external monitor to balance memory of many systems.
697 Everybody who wants to run Linux under VM should select this
702 prompt "IUCV special message interface to cooperative memory management"
703 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
705 Select this option to enable the special message interface to
706 the cooperative memory management.
710 prompt "Linux - VM Monitor Stream, base infrastructure"
713 This provides a kernel interface for creating and updating z/VM APPLDATA
714 monitor records. The monitor records are updated at certain time
715 intervals, once the timer is started.
716 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
717 i.e. enables or disables monitoring on the Linux side.
718 A custom interval value (in seconds) can be written to
719 /proc/appldata/interval.
721 Defaults are 60 seconds interval and timer off.
722 The /proc entries can also be read from, showing the current settings.
726 prompt "Monitor memory management statistics"
727 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
729 This provides memory management related data to the Linux - VM Monitor
730 Stream, like paging/swapping rate, memory utilisation, etc.
731 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
732 APPLDATA monitor record, i.e. enables or disables monitoring this record
736 The /proc entry can also be read from, showing the current settings.
738 This can also be compiled as a module, which will be called
743 prompt "Monitor OS statistics"
744 depends on APPLDATA_BASE
746 This provides OS related data to the Linux - VM Monitor Stream, like
747 CPU utilisation, etc.
748 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
749 APPLDATA monitor record, i.e. enables or disables monitoring this record
753 This can also be compiled as a module, which will be called
756 config APPLDATA_NET_SUM
758 prompt "Monitor overall network statistics"
759 depends on APPLDATA_BASE && NET
761 This provides network related data to the Linux - VM Monitor Stream,
762 currently there is only a total sum of network I/O statistics, no
764 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
765 APPLDATA monitor record, i.e. enables or disables monitoring this record
769 This can also be compiled as a module, which will be called
774 prompt "s390 hypervisor file system support"
775 select SYS_HYPERVISOR
777 This is a virtual file system intended to provide accounting
778 information in an s390 hypervisor environment.
780 source "arch/s390/kvm/Kconfig"
784 prompt "s390 support for virtio devices"
787 select VIRTUALIZATION
789 select VIRTIO_CONSOLE
791 Enabling this option adds support for virtio based paravirtual device
794 Select this option if you want to run the kernel as a guest under