arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config CPU_BIG_ENDIAN
   8         def_bool y
   9
  10 config LOCKDEP_SUPPORT
  11         def_bool y
  12
  13 config STACKTRACE_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config ARCH_DMA_ADDR_T_64BIT
  38         def_bool y
  39
  40 config GENERIC_LOCKBREAK
  41         def_bool y if SMP && PREEMPT
  42
  43 config PGSTE
  44         def_bool y if KVM
  45
  46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  47         def_bool y
  48
  49 config KEXEC
  50         def_bool y
  51         select KEXEC_CORE
  52
  53 config AUDIT_ARCH
  54         def_bool y
  55
  56 config NO_IOPORT_MAP
  57         def_bool y
  58
  59 config PCI_QUIRKS
  60         def_bool n
  61
  62 config ARCH_SUPPORTS_UPROBES
  63         def_bool y
  64
  65 config DEBUG_RODATA
  66         def_bool y
  67
  68 config S390
  69         def_bool y
  70         select ARCH_HAS_DEVMEM_IS_ALLOWED
  71         select ARCH_HAS_ELF_RANDOMIZE
  72         select ARCH_HAS_GCOV_PROFILE_ALL
  73         select ARCH_HAS_GIGANTIC_PAGE
  74         select ARCH_HAS_KCOV
  75         select ARCH_HAS_SG_CHAIN
  76         select ARCH_HAS_UBSAN_SANITIZE_ALL
  77         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  78         select ARCH_INLINE_READ_LOCK
  79         select ARCH_INLINE_READ_LOCK_BH
  80         select ARCH_INLINE_READ_LOCK_IRQ
  81         select ARCH_INLINE_READ_LOCK_IRQSAVE
  82         select ARCH_INLINE_READ_TRYLOCK
  83         select ARCH_INLINE_READ_UNLOCK
  84         select ARCH_INLINE_READ_UNLOCK_BH
  85         select ARCH_INLINE_READ_UNLOCK_IRQ
  86         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  87         select ARCH_INLINE_SPIN_LOCK
  88         select ARCH_INLINE_SPIN_LOCK_BH
  89         select ARCH_INLINE_SPIN_LOCK_IRQ
  90         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  91         select ARCH_INLINE_SPIN_TRYLOCK
  92         select ARCH_INLINE_SPIN_TRYLOCK_BH
  93         select ARCH_INLINE_SPIN_UNLOCK
  94         select ARCH_INLINE_SPIN_UNLOCK_BH
  95         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  96         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  97         select ARCH_INLINE_WRITE_LOCK
  98         select ARCH_INLINE_WRITE_LOCK_BH
  99         select ARCH_INLINE_WRITE_LOCK_IRQ
 100         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 101         select ARCH_INLINE_WRITE_TRYLOCK
 102         select ARCH_INLINE_WRITE_UNLOCK
 103         select ARCH_INLINE_WRITE_UNLOCK_BH
 104         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 105         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 106         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 107         select ARCH_SUPPORTS_ATOMIC_RMW
 108         select ARCH_SUPPORTS_NUMA_BALANCING
 109         select ARCH_USE_BUILTIN_BSWAP
 110         select ARCH_USE_CMPXCHG_LOCKREF
 111         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 112         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 113         select ARCH_WANTS_UBSAN_NO_NULL
 114         select ARCH_WANT_IPC_PARSE_VERSION
 115         select BUILDTIME_EXTABLE_SORT
 116         select CLONE_BACKWARDS2
 117         select DYNAMIC_FTRACE if FUNCTION_TRACER
 118         select GENERIC_CLOCKEVENTS
 119         select GENERIC_CPU_AUTOPROBE
 120         select GENERIC_CPU_DEVICES if !SMP
 121         select GENERIC_FIND_FIRST_BIT
 122         select GENERIC_SMP_IDLE_THREAD
 123         select GENERIC_TIME_VSYSCALL
 124         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 125         select HAVE_ARCH_AUDITSYSCALL
 126         select HAVE_ARCH_EARLY_PFN_TO_NID
 127         select HAVE_ARCH_HARDENED_USERCOPY
 128         select HAVE_ARCH_JUMP_LABEL
 129         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 130         select HAVE_ARCH_SECCOMP_FILTER
 131         select HAVE_ARCH_SOFT_DIRTY
 132         select HAVE_ARCH_TRACEHOOK
 133         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 134         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 135         select HAVE_CMPXCHG_DOUBLE
 136         select HAVE_CMPXCHG_LOCAL
 137         select HAVE_DEBUG_KMEMLEAK
 138         select HAVE_DMA_API_DEBUG
 139         select HAVE_DMA_CONTIGUOUS
 140         select HAVE_DYNAMIC_FTRACE
 141         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 142         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 143         select HAVE_EXIT_THREAD
 144         select HAVE_FTRACE_MCOUNT_RECORD
 145         select HAVE_FUNCTION_GRAPH_TRACER
 146         select HAVE_FUNCTION_TRACER
 147         select HAVE_FUTEX_CMPXCHG if FUTEX
 148         select HAVE_KERNEL_BZIP2
 149         select HAVE_KERNEL_GZIP
 150         select HAVE_KERNEL_LZ4
 151         select HAVE_KERNEL_LZMA
 152         select HAVE_KERNEL_LZO
 153         select HAVE_KERNEL_XZ
 154         select HAVE_KPROBES
 155         select HAVE_KRETPROBES
 156         select HAVE_KVM
 157         select HAVE_LIVEPATCH
 158         select HAVE_MEMBLOCK
 159         select HAVE_MEMBLOCK_NODE_MAP
 160         select HAVE_MEMBLOCK_PHYS_MAP
 161         select HAVE_MOD_ARCH_SPECIFIC
 162         select HAVE_OPROFILE
 163         select HAVE_PERF_EVENTS
 164         select HAVE_REGS_AND_STACK_ACCESS_API
 165         select HAVE_SYSCALL_TRACEPOINTS
 166         select HAVE_VIRT_CPU_ACCOUNTING
 167         select MODULES_USE_ELF_RELA
 168         select NO_BOOTMEM
 169         select OLD_SIGACTION
 170         select OLD_SIGSUSPEND3
 171         select SPARSE_IRQ
 172         select SYSCTL_EXCEPTION_TRACE
 173         select THREAD_INFO_IN_TASK
 174         select TTY
 175         select VIRT_CPU_ACCOUNTING
 176         select ARCH_HAS_SCALED_CPUTIME
 177         select VIRT_TO_BUS
 178         select HAVE_NMI
 179
 180
 181 config SCHED_OMIT_FRAME_POINTER
 182         def_bool y
 183
 184 config PGTABLE_LEVELS
 185         int
 186         default 4
 187
 188 source "init/Kconfig"
 189
 190 source "kernel/Kconfig.freezer"
 191
 192 source "kernel/livepatch/Kconfig"
 193
 194 menu "Processor type and features"
 195
 196 config HAVE_MARCH_Z900_FEATURES
 197         def_bool n
 198
 199 config HAVE_MARCH_Z990_FEATURES
 200         def_bool n
 201         select HAVE_MARCH_Z900_FEATURES
 202
 203 config HAVE_MARCH_Z9_109_FEATURES
 204         def_bool n
 205         select HAVE_MARCH_Z990_FEATURES
 206
 207 config HAVE_MARCH_Z10_FEATURES
 208         def_bool n
 209         select HAVE_MARCH_Z9_109_FEATURES
 210
 211 config HAVE_MARCH_Z196_FEATURES
 212         def_bool n
 213         select HAVE_MARCH_Z10_FEATURES
 214
 215 config HAVE_MARCH_ZEC12_FEATURES
 216         def_bool n
 217         select HAVE_MARCH_Z196_FEATURES
 218
 219 config HAVE_MARCH_Z13_FEATURES
 220         def_bool n
 221         select HAVE_MARCH_ZEC12_FEATURES
 222
 223 choice
 224         prompt "Processor type"
 225         default MARCH_Z196
 226
 227 config MARCH_Z900
 228         bool "IBM zSeries model z800 and z900"
 229         select HAVE_MARCH_Z900_FEATURES
 230         help
 231           Select this to enable optimizations for model z800/z900 (2064 and
 232           2066 series). This will enable some optimizations that are not
 233           available on older ESA/390 (31 Bit) only CPUs.
 234
 235 config MARCH_Z990
 236         bool "IBM zSeries model z890 and z990"
 237         select HAVE_MARCH_Z990_FEATURES
 238         help
 239           Select this to enable optimizations for model z890/z990 (2084 and
 240           2086 series). The kernel will be slightly faster but will not work
 241           on older machines.
 242
 243 config MARCH_Z9_109
 244         bool "IBM System z9"
 245         select HAVE_MARCH_Z9_109_FEATURES
 246         help
 247           Select this to enable optimizations for IBM System z9 (2094 and
 248           2096 series). The kernel will be slightly faster but will not work
 249           on older machines.
 250
 251 config MARCH_Z10
 252         bool "IBM System z10"
 253         select HAVE_MARCH_Z10_FEATURES
 254         help
 255           Select this to enable optimizations for IBM System z10 (2097 and
 256           2098 series). The kernel will be slightly faster but will not work
 257           on older machines.
 258
 259 config MARCH_Z196
 260         bool "IBM zEnterprise 114 and 196"
 261         select HAVE_MARCH_Z196_FEATURES
 262         help
 263           Select this to enable optimizations for IBM zEnterprise 114 and 196
 264           (2818 and 2817 series). The kernel will be slightly faster but will
 265           not work on older machines.
 266
 267 config MARCH_ZEC12
 268         bool "IBM zBC12 and zEC12"
 269         select HAVE_MARCH_ZEC12_FEATURES
 270         help
 271           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 272           2827 series). The kernel will be slightly faster but will not work on
 273           older machines.
 274
 275 config MARCH_Z13
 276         bool "IBM z13s and z13"
 277         select HAVE_MARCH_Z13_FEATURES
 278         help
 279           Select this to enable optimizations for IBM z13s and z13 (2965 and
 280           2964 series). The kernel will be slightly faster but will not work on
 281           older machines.
 282
 283 endchoice
 284
 285 config MARCH_Z900_TUNE
 286         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 287
 288 config MARCH_Z990_TUNE
 289         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 290
 291 config MARCH_Z9_109_TUNE
 292         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 293
 294 config MARCH_Z10_TUNE
 295         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 296
 297 config MARCH_Z196_TUNE
 298         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 299
 300 config MARCH_ZEC12_TUNE
 301         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 302
 303 config MARCH_Z13_TUNE
 304         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 305
 306 choice
 307         prompt "Tune code generation"
 308         default TUNE_DEFAULT
 309         help
 310           Cause the compiler to tune (-mtune) the generated code for a machine.
 311           This will make the code run faster on the selected machine but
 312           somewhat slower on other machines.
 313           This option only changes how the compiler emits instructions, not the
 314           selection of instructions itself, so the resulting kernel will run on
 315           all other machines.
 316
 317 config TUNE_DEFAULT
 318         bool "Default"
 319         help
 320           Tune the generated code for the target processor for which the kernel
 321           will be compiled.
 322
 323 config TUNE_Z900
 324         bool "IBM zSeries model z800 and z900"
 325
 326 config TUNE_Z990
 327         bool "IBM zSeries model z890 and z990"
 328
 329 config TUNE_Z9_109
 330         bool "IBM System z9"
 331
 332 config TUNE_Z10
 333         bool "IBM System z10"
 334
 335 config TUNE_Z196
 336         bool "IBM zEnterprise 114 and 196"
 337
 338 config TUNE_ZEC12
 339         bool "IBM zBC12 and zEC12"
 340
 341 config TUNE_Z13
 342         bool "IBM z13"
 343
 344 endchoice
 345
 346 config 64BIT
 347         def_bool y
 348
 349 config COMPAT
 350         def_bool y
 351         prompt "Kernel support for 31 bit emulation"
 352         select COMPAT_BINFMT_ELF if BINFMT_ELF
 353         select ARCH_WANT_OLD_COMPAT_IPC
 354         select COMPAT_OLD_SIGACTION
 355         depends on MULTIUSER
 356         help
 357           Select this option if you want to enable your system kernel to
 358           handle system-calls from ELF binaries for 31 bit ESA.  This option
 359           (and some other stuff like libraries and such) is needed for
 360           executing 31 bit applications.  It is safe to say "Y".
 361
 362 config SYSVIPC_COMPAT
 363         def_bool y if COMPAT && SYSVIPC
 364
 365 config KEYS_COMPAT
 366         def_bool y if COMPAT && KEYS
 367
 368 config SMP
 369         def_bool y
 370         prompt "Symmetric multi-processing support"
 371         ---help---
 372           This enables support for systems with more than one CPU. If you have
 373           a system with only one CPU, like most personal computers, say N. If
 374           you have a system with more than one CPU, say Y.
 375
 376           If you say N here, the kernel will run on uni- and multiprocessor
 377           machines, but will use only one CPU of a multiprocessor machine. If
 378           you say Y here, the kernel will run on many, but not all,
 379           uniprocessor machines. On a uniprocessor machine, the kernel
 380           will run faster if you say N here.
 381
 382           See also the SMP-HOWTO available at
 383           <http://www.tldp.org/docs.html#howto>.
 384
 385           Even if you don't know what to do here, say Y.
 386
 387 config NR_CPUS
 388         int "Maximum number of CPUs (2-512)"
 389         range 2 512
 390         depends on SMP
 391         default "64"
 392         help
 393           This allows you to specify the maximum number of CPUs which this
 394           kernel will support. The maximum supported value is 512 and the
 395           minimum value which makes sense is 2.
 396
 397           This is purely to save memory - each supported CPU adds
 398           approximately sixteen kilobytes to the kernel image.
 399
 400 config HOTPLUG_CPU
 401         def_bool y
 402         prompt "Support for hot-pluggable CPUs"
 403         depends on SMP
 404         help
 405           Say Y here to be able to turn CPUs off and on. CPUs
 406           can be controlled through /sys/devices/system/cpu/cpu#.
 407           Say N if you want to disable CPU hotplug.
 408
 409 # Some NUMA nodes have memory ranges that span
 410 # other nodes.  Even though a pfn is valid and
 411 # between a node's start and end pfns, it may not
 412 # reside on that node.  See memmap_init_zone()
 413 # for details. <- They meant memory holes!
 414 config NODES_SPAN_OTHER_NODES
 415         def_bool NUMA
 416
 417 config NUMA
 418         bool "NUMA support"
 419         depends on SMP && SCHED_TOPOLOGY
 420         default n
 421         help
 422           Enable NUMA support
 423
 424           This option adds NUMA support to the kernel.
 425
 426           An operation mode can be selected by appending
 427           numa=<method> to the kernel command line.
 428
 429           The default behaviour is identical to appending numa=plain to
 430           the command line. This will create just one node with all
 431           available memory and all CPUs in it.
 432
 433 config NODES_SHIFT
 434         int "Maximum NUMA nodes (as a power of 2)"
 435         range 1 10
 436         depends on NUMA
 437         default "4"
 438         help
 439           Specify the maximum number of NUMA nodes available on the target
 440           system. Increases memory reserved to accommodate various tables.
 441
 442 menu "Select NUMA modes"
 443         depends on NUMA
 444
 445 config NUMA_EMU
 446         bool "NUMA emulation"
 447         default y
 448         help
 449           Numa emulation mode will split the available system memory into
 450           equal chunks which then are distributed over the configured number
 451           of nodes in a round-robin manner.
 452
 453           The number of fake nodes is limited by the number of available memory
 454           chunks (i.e. memory size / fake size) and the number of supported
 455           nodes in the kernel.
 456
 457           The CPUs are assigned to the nodes in a way that partially respects
 458           the original machine topology (if supported by the machine).
 459           Fair distribution of the CPUs is not guaranteed.
 460
 461 config EMU_SIZE
 462         hex "NUMA emulation memory chunk size"
 463         default 0x10000000
 464         range 0x400000 0x100000000
 465         depends on NUMA_EMU
 466         help
 467           Select the default size by which the memory is chopped and then
 468           assigned to emulated NUMA nodes.
 469
 470           This can be overridden by specifying
 471
 472           emu_size=<n>
 473
 474           on the kernel command line where also suffixes K, M, G, and T are
 475           supported.
 476
 477 endmenu
 478
 479 config SCHED_SMT
 480         def_bool n
 481
 482 config SCHED_MC
 483         def_bool n
 484
 485 config SCHED_BOOK
 486         def_bool n
 487
 488 config SCHED_DRAWER
 489         def_bool n
 490
 491 config SCHED_TOPOLOGY
 492         def_bool y
 493         prompt "Topology scheduler support"
 494         depends on SMP
 495         select SCHED_SMT
 496         select SCHED_MC
 497         select SCHED_BOOK
 498         select SCHED_DRAWER
 499         help
 500           Topology scheduler support improves the CPU scheduler's decision
 501           making when dealing with machines that have multi-threading,
 502           multiple cores or multiple books.
 503
 504 source kernel/Kconfig.preempt
 505
 506 source kernel/Kconfig.hz
 507
 508 endmenu
 509
 510 menu "Memory setup"
 511
 512 config ARCH_SPARSEMEM_ENABLE
 513         def_bool y
 514         select SPARSEMEM_VMEMMAP_ENABLE
 515         select SPARSEMEM_VMEMMAP
 516
 517 config ARCH_SPARSEMEM_DEFAULT
 518         def_bool y
 519
 520 config ARCH_SELECT_MEMORY_MODEL
 521         def_bool y
 522
 523 config ARCH_ENABLE_MEMORY_HOTPLUG
 524         def_bool y if SPARSEMEM
 525
 526 config ARCH_ENABLE_MEMORY_HOTREMOVE
 527         def_bool y
 528
 529 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 530         def_bool y
 531
 532 config FORCE_MAX_ZONEORDER
 533         int
 534         default "9"
 535
 536 source "mm/Kconfig"
 537
 538 config PACK_STACK
 539         def_bool y
 540         prompt "Pack kernel stack"
 541         help
 542           This option enables the compiler option -mkernel-backchain if it
 543           is available. If the option is available the compiler supports
 544           the new stack layout which dramatically reduces the minimum stack
 545           frame size. With an old compiler a non-leaf function needs a
 546           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 547           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 548           and 24 byte on 64 bit.
 549
 550           Say Y if you are unsure.
 551
 552 config CHECK_STACK
 553         def_bool y
 554         prompt "Detect kernel stack overflow"
 555         help
 556           This option enables the compiler option -mstack-guard and
 557           -mstack-size if they are available. If the compiler supports them
 558           it will emit additional code to each function prolog to trigger
 559           an illegal operation if the kernel stack is about to overflow.
 560
 561           Say N if you are unsure.
 562
 563 config STACK_GUARD
 564         int "Size of the guard area (128-1024)"
 565         range 128 1024
 566         depends on CHECK_STACK
 567         default "256"
 568         help
 569           This allows you to specify the size of the guard area at the lower
 570           end of the kernel stack. If the kernel stack points into the guard
 571           area on function entry an illegal operation is triggered. The size
 572           needs to be a power of 2. Please keep in mind that the size of an
 573           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 574           The minimum size for the stack guard should be 256 for 31 bit and
 575           512 for 64 bit.
 576
 577 config WARN_DYNAMIC_STACK
 578         def_bool n
 579         prompt "Emit compiler warnings for function with dynamic stack usage"
 580         help
 581           This option enables the compiler option -mwarn-dynamicstack. If the
 582           compiler supports this options generates warnings for functions
 583           that dynamically allocate stack space using alloca.
 584
 585           Say N if you are unsure.
 586
 587 endmenu
 588
 589 menu "I/O subsystem"
 590
 591 config QDIO
 592         def_tristate y
 593         prompt "QDIO support"
 594         ---help---
 595           This driver provides the Queued Direct I/O base support for
 596           IBM System z.
 597
 598           To compile this driver as a module, choose M here: the
 599           module will be called qdio.
 600
 601           If unsure, say Y.
 602
 603 menuconfig PCI
 604         bool "PCI support"
 605         select PCI_MSI
 606         select IOMMU_SUPPORT
 607         help
 608           Enable PCI support.
 609
 610 if PCI
 611
 612 config PCI_NR_FUNCTIONS
 613         int "Maximum number of PCI functions (1-4096)"
 614         range 1 4096
 615         default "64"
 616         help
 617           This allows you to specify the maximum number of PCI functions which
 618           this kernel will support.
 619
 620 source "drivers/pci/Kconfig"
 621
 622 endif   # PCI
 623
 624 config PCI_DOMAINS
 625         def_bool PCI
 626
 627 config HAS_IOMEM
 628         def_bool PCI
 629
 630 config IOMMU_HELPER
 631         def_bool PCI
 632
 633 config NEED_SG_DMA_LENGTH
 634         def_bool PCI
 635
 636 config NEED_DMA_MAP_STATE
 637         def_bool PCI
 638
 639 config CHSC_SCH
 640         def_tristate m
 641         prompt "Support for CHSC subchannels"
 642         help
 643           This driver allows usage of CHSC subchannels. A CHSC subchannel
 644           is usually present on LPAR only.
 645           The driver creates a device /dev/chsc, which may be used to
 646           obtain I/O configuration information about the machine and
 647           to issue asynchronous chsc commands (DANGEROUS).
 648           You will usually only want to use this interface on a special
 649           LPAR designated for system management.
 650
 651           To compile this driver as a module, choose M here: the
 652           module will be called chsc_sch.
 653
 654           If unsure, say N.
 655
 656 config SCM_BUS
 657         def_bool y
 658         prompt "SCM bus driver"
 659         help
 660           Bus driver for Storage Class Memory.
 661
 662 config EADM_SCH
 663         def_tristate m
 664         prompt "Support for EADM subchannels"
 665         depends on SCM_BUS
 666         help
 667           This driver allows usage of EADM subchannels. EADM subchannels act
 668           as a communication vehicle for SCM increments.
 669
 670           To compile this driver as a module, choose M here: the
 671           module will be called eadm_sch.
 672
 673 endmenu
 674
 675 menu "Dump support"
 676
 677 config CRASH_DUMP
 678         bool "kernel crash dumps"
 679         depends on SMP
 680         select KEXEC
 681         help
 682           Generate crash dump after being started by kexec.
 683           Crash dump kernels are loaded in the main kernel with kexec-tools
 684           into a specially reserved region and then later executed after
 685           a crash by kdump/kexec.
 686           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 687           This option also enables s390 zfcpdump.
 688           See also <file:Documentation/s390/zfcpdump.txt>
 689
 690 endmenu
 691
 692 menu "Executable file formats / Emulations"
 693
 694 source "fs/Kconfig.binfmt"
 695
 696 config SECCOMP
 697         def_bool y
 698         prompt "Enable seccomp to safely compute untrusted bytecode"
 699         depends on PROC_FS
 700         help
 701           This kernel feature is useful for number crunching applications
 702           that may need to compute untrusted bytecode during their
 703           execution. By using pipes or other transports made available to
 704           the process as file descriptors supporting the read/write
 705           syscalls, it's possible to isolate those applications in
 706           their own address space using seccomp. Once seccomp is
 707           enabled via /proc/<pid>/seccomp, it cannot be disabled
 708           and the task is only allowed to execute a few safe syscalls
 709           defined by each seccomp mode.
 710
 711           If unsure, say Y.
 712
 713 endmenu
 714
 715 menu "Power Management"
 716
 717 config ARCH_HIBERNATION_POSSIBLE
 718         def_bool y
 719
 720 source "kernel/power/Kconfig"
 721
 722 endmenu
 723
 724 source "net/Kconfig"
 725
 726 config PCMCIA
 727         def_bool n
 728
 729 config CCW
 730         def_bool y
 731
 732 source "drivers/Kconfig"
 733
 734 source "fs/Kconfig"
 735
 736 source "arch/s390/Kconfig.debug"
 737
 738 source "security/Kconfig"
 739
 740 source "crypto/Kconfig"
 741
 742 source "lib/Kconfig"
 743
 744 menu "Virtualization"
 745
 746 config PFAULT
 747         def_bool y
 748         prompt "Pseudo page fault support"
 749         help
 750           Select this option, if you want to use PFAULT pseudo page fault
 751           handling under VM. If running native or in LPAR, this option
 752           has no effect. If your VM does not support PFAULT, PAGEEX
 753           pseudo page fault handling will be used.
 754           Note that VM 4.2 supports PFAULT but has a bug in its
 755           implementation that causes some problems.
 756           Everybody who wants to run Linux under VM != VM4.2 should select
 757           this option.
 758
 759 config SHARED_KERNEL
 760         bool "VM shared kernel support"
 761         depends on !JUMP_LABEL
 762         help
 763           Select this option, if you want to share the text segment of the
 764           Linux kernel between different VM guests. This reduces memory
 765           usage with lots of guests but greatly increases kernel size.
 766           Also if a kernel was IPL'ed from a shared segment the kexec system
 767           call will not work.
 768           You should only select this option if you know what you are
 769           doing and want to exploit this feature.
 770
 771 config CMM
 772         def_tristate n
 773         prompt "Cooperative memory management"
 774         help
 775           Select this option, if you want to enable the kernel interface
 776           to reduce the memory size of the system. This is accomplished
 777           by allocating pages of memory and put them "on hold". This only
 778           makes sense for a system running under VM where the unused pages
 779           will be reused by VM for other guest systems. The interface
 780           allows an external monitor to balance memory of many systems.
 781           Everybody who wants to run Linux under VM should select this
 782           option.
 783
 784 config CMM_IUCV
 785         def_bool y
 786         prompt "IUCV special message interface to cooperative memory management"
 787         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 788         help
 789           Select this option to enable the special message interface to
 790           the cooperative memory management.
 791
 792 config APPLDATA_BASE
 793         def_bool n
 794         prompt "Linux - VM Monitor Stream, base infrastructure"
 795         depends on PROC_FS
 796         help
 797           This provides a kernel interface for creating and updating z/VM APPLDATA
 798           monitor records. The monitor records are updated at certain time
 799           intervals, once the timer is started.
 800           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 801           i.e. enables or disables monitoring on the Linux side.
 802           A custom interval value (in seconds) can be written to
 803           /proc/appldata/interval.
 804
 805           Defaults are 60 seconds interval and timer off.
 806           The /proc entries can also be read from, showing the current settings.
 807
 808 config APPLDATA_MEM
 809         def_tristate m
 810         prompt "Monitor memory management statistics"
 811         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 812         help
 813           This provides memory management related data to the Linux - VM Monitor
 814           Stream, like paging/swapping rate, memory utilisation, etc.
 815           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 816           APPLDATA monitor record, i.e. enables or disables monitoring this record
 817           on the z/VM side.
 818
 819           Default is disabled.
 820           The /proc entry can also be read from, showing the current settings.
 821
 822           This can also be compiled as a module, which will be called
 823           appldata_mem.o.
 824
 825 config APPLDATA_OS
 826         def_tristate m
 827         prompt "Monitor OS statistics"
 828         depends on APPLDATA_BASE
 829         help
 830           This provides OS related data to the Linux - VM Monitor Stream, like
 831           CPU utilisation, etc.
 832           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 833           APPLDATA monitor record, i.e. enables or disables monitoring this record
 834           on the z/VM side.
 835
 836           Default is disabled.
 837           This can also be compiled as a module, which will be called
 838           appldata_os.o.
 839
 840 config APPLDATA_NET_SUM
 841         def_tristate m
 842         prompt "Monitor overall network statistics"
 843         depends on APPLDATA_BASE && NET
 844         help
 845           This provides network related data to the Linux - VM Monitor Stream,
 846           currently there is only a total sum of network I/O statistics, no
 847           per-interface data.
 848           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 849           APPLDATA monitor record, i.e. enables or disables monitoring this record
 850           on the z/VM side.
 851
 852           Default is disabled.
 853           This can also be compiled as a module, which will be called
 854           appldata_net_sum.o.
 855
 856 config S390_HYPFS_FS
 857         def_bool y
 858         prompt "s390 hypervisor file system support"
 859         select SYS_HYPERVISOR
 860         help
 861           This is a virtual file system intended to provide accounting
 862           information in an s390 hypervisor environment.
 863
 864 source "arch/s390/kvm/Kconfig"
 865
 866 config S390_GUEST
 867         def_bool y
 868         prompt "s390 support for virtio devices"
 869         select TTY
 870         select VIRTUALIZATION
 871         select VIRTIO
 872         select VIRTIO_CONSOLE
 873         help
 874           Enabling this option adds support for virtio based paravirtual device
 875           drivers on s390.
 876
 877           Select this option if you want to run the kernel as a guest under
 878           the KVM hypervisor.
 879
 880 config S390_GUEST_OLD_TRANSPORT
 881         def_bool y
 882         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 883         depends on S390_GUEST
 884         help
 885           Enable this option to add support for the old s390-virtio
 886           transport (i.e. virtio devices NOT based on virtio-ccw). This
 887           type of virtio devices is only available on the experimental
 888           kuli userspace or with old (< 2.6) qemu. If you are running
 889           with a modern version of qemu (which supports virtio-ccw since
 890           1.4 and uses it by default since version 2.4), you probably won't
 891           need this.
 892
 893 endmenu