arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_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 NO_IOMEM
  38         def_bool y
  39
  40 config NO_DMA
  41         def_bool y
  42
  43 config ARCH_DMA_ADDR_T_64BIT
  44         def_bool 64BIT
  45
  46 config GENERIC_LOCKBREAK
  47         def_bool y if SMP && PREEMPT
  48
  49 config PGSTE
  50         def_bool y if KVM
  51
  52 config VIRT_CPU_ACCOUNTING
  53         def_bool y
  54
  55 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  56         def_bool y
  57
  58 config S390
  59         def_bool y
  60         select USE_GENERIC_SMP_HELPERS if SMP
  61         select GENERIC_CPU_DEVICES if !SMP
  62         select HAVE_SYSCALL_WRAPPERS
  63         select HAVE_FUNCTION_TRACER
  64         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  65         select HAVE_FTRACE_MCOUNT_RECORD
  66         select HAVE_C_RECORDMCOUNT
  67         select HAVE_SYSCALL_TRACEPOINTS
  68         select HAVE_DYNAMIC_FTRACE
  69         select HAVE_FUNCTION_GRAPH_TRACER
  70         select HAVE_REGS_AND_STACK_ACCESS_API
  71         select HAVE_OPROFILE
  72         select HAVE_KPROBES
  73         select HAVE_KRETPROBES
  74         select HAVE_KVM if 64BIT
  75         select HAVE_ARCH_TRACEHOOK
  76         select INIT_ALL_POSSIBLE
  77         select HAVE_IRQ_WORK
  78         select HAVE_PERF_EVENTS
  79         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  80         select HAVE_KERNEL_GZIP
  81         select HAVE_KERNEL_BZIP2
  82         select HAVE_KERNEL_LZMA
  83         select HAVE_KERNEL_LZO
  84         select HAVE_KERNEL_XZ
  85         select HAVE_ARCH_MUTEX_CPU_RELAX
  86         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
  87         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  88         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  89         select HAVE_MEMBLOCK
  90         select HAVE_MEMBLOCK_NODE_MAP
  91         select HAVE_CMPXCHG_LOCAL
  92         select ARCH_DISCARD_MEMBLOCK
  93         select ARCH_INLINE_SPIN_TRYLOCK
  94         select ARCH_INLINE_SPIN_TRYLOCK_BH
  95         select ARCH_INLINE_SPIN_LOCK
  96         select ARCH_INLINE_SPIN_LOCK_BH
  97         select ARCH_INLINE_SPIN_LOCK_IRQ
  98         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  99         select ARCH_INLINE_SPIN_UNLOCK
 100         select ARCH_INLINE_SPIN_UNLOCK_BH
 101         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 102         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 103         select ARCH_INLINE_READ_TRYLOCK
 104         select ARCH_INLINE_READ_LOCK
 105         select ARCH_INLINE_READ_LOCK_BH
 106         select ARCH_INLINE_READ_LOCK_IRQ
 107         select ARCH_INLINE_READ_LOCK_IRQSAVE
 108         select ARCH_INLINE_READ_UNLOCK
 109         select ARCH_INLINE_READ_UNLOCK_BH
 110         select ARCH_INLINE_READ_UNLOCK_IRQ
 111         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 112         select ARCH_INLINE_WRITE_TRYLOCK
 113         select ARCH_INLINE_WRITE_LOCK
 114         select ARCH_INLINE_WRITE_LOCK_BH
 115         select ARCH_INLINE_WRITE_LOCK_IRQ
 116         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 117         select ARCH_INLINE_WRITE_UNLOCK
 118         select ARCH_INLINE_WRITE_UNLOCK_BH
 119         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 120         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 121         select GENERIC_SMP_IDLE_THREAD
 122         select GENERIC_TIME_VSYSCALL
 123         select GENERIC_CLOCKEVENTS
 124         select KTIME_SCALAR if 32BIT
 125
 126 config SCHED_OMIT_FRAME_POINTER
 127         def_bool y
 128
 129 source "init/Kconfig"
 130
 131 source "kernel/Kconfig.freezer"
 132
 133 menu "Base setup"
 134
 135 comment "Processor type and features"
 136
 137 config 64BIT
 138         def_bool y
 139         prompt "64 bit kernel"
 140         help
 141           Select this option if you have an IBM z/Architecture machine
 142           and want to use the 64 bit addressing mode.
 143
 144 config 32BIT
 145         def_bool y if !64BIT
 146
 147 config SMP
 148         def_bool y
 149         prompt "Symmetric multi-processing support"
 150         ---help---
 151           This enables support for systems with more than one CPU. If you have
 152           a system with only one CPU, like most personal computers, say N. If
 153           you have a system with more than one CPU, say Y.
 154
 155           If you say N here, the kernel will run on single and multiprocessor
 156           machines, but will use only one CPU of a multiprocessor machine. If
 157           you say Y here, the kernel will run on many, but not all,
 158           singleprocessor machines. On a singleprocessor machine, the kernel
 159           will run faster if you say N here.
 160
 161           See also the SMP-HOWTO available at
 162           <http://www.tldp.org/docs.html#howto>.
 163
 164           Even if you don't know what to do here, say Y.
 165
 166 config NR_CPUS
 167         int "Maximum number of CPUs (2-64)"
 168         range 2 64
 169         depends on SMP
 170         default "32" if !64BIT
 171         default "64" if 64BIT
 172         help
 173           This allows you to specify the maximum number of CPUs which this
 174           kernel will support.  The maximum supported value is 64 and the
 175           minimum value which makes sense is 2.
 176
 177           This is purely to save memory - each supported CPU adds
 178           approximately sixteen kilobytes to the kernel image.
 179
 180 config HOTPLUG_CPU
 181         def_bool y
 182         prompt "Support for hot-pluggable CPUs"
 183         depends on SMP
 184         select HOTPLUG
 185         help
 186           Say Y here to be able to turn CPUs off and on. CPUs
 187           can be controlled through /sys/devices/system/cpu/cpu#.
 188           Say N if you want to disable CPU hotplug.
 189
 190 config SCHED_MC
 191         def_bool n
 192
 193 config SCHED_BOOK
 194         def_bool y
 195         prompt "Book scheduler support"
 196         depends on SMP
 197         select SCHED_MC
 198         help
 199           Book scheduler support improves the CPU scheduler's decision making
 200           when dealing with machines that have several books.
 201
 202 config MATHEMU
 203         def_bool y
 204         prompt "IEEE FPU emulation"
 205         depends on MARCH_G5
 206         help
 207           This option is required for IEEE compliant floating point arithmetic
 208           on older ESA/390 machines. Say Y unless you know your machine doesn't
 209           need this.
 210
 211 config COMPAT
 212         def_bool y
 213         prompt "Kernel support for 31 bit emulation"
 214         depends on 64BIT
 215         select COMPAT_BINFMT_ELF if BINFMT_ELF
 216         select ARCH_WANT_OLD_COMPAT_IPC
 217         help
 218           Select this option if you want to enable your system kernel to
 219           handle system-calls from ELF binaries for 31 bit ESA.  This option
 220           (and some other stuff like libraries and such) is needed for
 221           executing 31 bit applications.  It is safe to say "Y".
 222
 223 config SYSVIPC_COMPAT
 224         def_bool y if COMPAT && SYSVIPC
 225
 226 config KEYS_COMPAT
 227         def_bool y if COMPAT && KEYS
 228
 229 config AUDIT_ARCH
 230         def_bool y
 231
 232 config HAVE_MARCH_Z900_FEATURES
 233         def_bool n
 234
 235 config HAVE_MARCH_Z990_FEATURES
 236         def_bool n
 237         select HAVE_MARCH_Z900_FEATURES
 238
 239 config HAVE_MARCH_Z9_109_FEATURES
 240         def_bool n
 241         select HAVE_MARCH_Z990_FEATURES
 242
 243 config HAVE_MARCH_Z10_FEATURES
 244         def_bool n
 245         select HAVE_MARCH_Z9_109_FEATURES
 246
 247 config HAVE_MARCH_Z196_FEATURES
 248         def_bool n
 249         select HAVE_MARCH_Z10_FEATURES
 250
 251 comment "Code generation options"
 252
 253 choice
 254         prompt "Processor type"
 255         default MARCH_G5
 256
 257 config MARCH_G5
 258         bool "System/390 model G5 and G6"
 259         depends on !64BIT
 260         help
 261           Select this to build a 31 bit kernel that works
 262           on all ESA/390 and z/Architecture machines.
 263
 264 config MARCH_Z900
 265         bool "IBM zSeries model z800 and z900"
 266         select HAVE_MARCH_Z900_FEATURES if 64BIT
 267         help
 268           Select this to enable optimizations for model z800/z900 (2064 and
 269           2066 series). This will enable some optimizations that are not
 270           available on older ESA/390 (31 Bit) only CPUs.
 271
 272 config MARCH_Z990
 273         bool "IBM zSeries model z890 and z990"
 274         select HAVE_MARCH_Z990_FEATURES if 64BIT
 275         help
 276           Select this to enable optimizations for model z890/z990 (2084 and
 277           2086 series). The kernel will be slightly faster but will not work
 278           on older machines.
 279
 280 config MARCH_Z9_109
 281         bool "IBM System z9"
 282         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 283         help
 284           Select this to enable optimizations for IBM System z9 (2094 and
 285           2096 series). The kernel will be slightly faster but will not work
 286           on older machines.
 287
 288 config MARCH_Z10
 289         bool "IBM System z10"
 290         select HAVE_MARCH_Z10_FEATURES if 64BIT
 291         help
 292           Select this to enable optimizations for IBM System z10 (2097 and
 293           2098 series). The kernel will be slightly faster but will not work
 294           on older machines.
 295
 296 config MARCH_Z196
 297         bool "IBM zEnterprise 114 and 196"
 298         select HAVE_MARCH_Z196_FEATURES if 64BIT
 299         help
 300           Select this to enable optimizations for IBM zEnterprise 114 and 196
 301           (2818 and 2817 series). The kernel will be slightly faster but will
 302           not work on older machines.
 303
 304 endchoice
 305
 306 config PACK_STACK
 307         def_bool y
 308         prompt "Pack kernel stack"
 309         help
 310           This option enables the compiler option -mkernel-backchain if it
 311           is available. If the option is available the compiler supports
 312           the new stack layout which dramatically reduces the minimum stack
 313           frame size. With an old compiler a non-leaf function needs a
 314           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 315           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 316           and 24 byte on 64 bit.
 317
 318           Say Y if you are unsure.
 319
 320 config SMALL_STACK
 321         def_bool n
 322         prompt "Use 8kb for kernel stack instead of 16kb"
 323         depends on PACK_STACK && 64BIT && !LOCKDEP
 324         help
 325           If you say Y here and the compiler supports the -mkernel-backchain
 326           option the kernel will use a smaller kernel stack size. The reduced
 327           size is 8kb instead of 16kb. This allows to run more threads on a
 328           system and reduces the pressure on the memory management for higher
 329           order page allocations.
 330
 331           Say N if you are unsure.
 332
 333 config CHECK_STACK
 334         def_bool y
 335         prompt "Detect kernel stack overflow"
 336         help
 337           This option enables the compiler option -mstack-guard and
 338           -mstack-size if they are available. If the compiler supports them
 339           it will emit additional code to each function prolog to trigger
 340           an illegal operation if the kernel stack is about to overflow.
 341
 342           Say N if you are unsure.
 343
 344 config STACK_GUARD
 345         int "Size of the guard area (128-1024)"
 346         range 128 1024
 347         depends on CHECK_STACK
 348         default "256"
 349         help
 350           This allows you to specify the size of the guard area at the lower
 351           end of the kernel stack. If the kernel stack points into the guard
 352           area on function entry an illegal operation is triggered. The size
 353           needs to be a power of 2. Please keep in mind that the size of an
 354           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 355           The minimum size for the stack guard should be 256 for 31 bit and
 356           512 for 64 bit.
 357
 358 config WARN_DYNAMIC_STACK
 359         def_bool n
 360         prompt "Emit compiler warnings for function with dynamic stack usage"
 361         help
 362           This option enables the compiler option -mwarn-dynamicstack. If the
 363           compiler supports this options generates warnings for functions
 364           that dynamically allocate stack space using alloca.
 365
 366           Say N if you are unsure.
 367
 368 comment "Kernel preemption"
 369
 370 source "kernel/Kconfig.preempt"
 371
 372 config ARCH_SPARSEMEM_ENABLE
 373         def_bool y
 374         select SPARSEMEM_VMEMMAP_ENABLE
 375         select SPARSEMEM_VMEMMAP
 376         select SPARSEMEM_STATIC if !64BIT
 377
 378 config ARCH_SPARSEMEM_DEFAULT
 379         def_bool y
 380
 381 config ARCH_SELECT_MEMORY_MODEL
 382         def_bool y
 383
 384 config ARCH_ENABLE_MEMORY_HOTPLUG
 385         def_bool y if SPARSEMEM
 386
 387 config ARCH_ENABLE_MEMORY_HOTREMOVE
 388         def_bool y
 389
 390 config ARCH_HIBERNATION_POSSIBLE
 391         def_bool y if 64BIT
 392
 393 source "mm/Kconfig"
 394
 395 comment "I/O subsystem configuration"
 396
 397 config QDIO
 398         def_tristate y
 399         prompt "QDIO support"
 400         ---help---
 401           This driver provides the Queued Direct I/O base support for
 402           IBM System z.
 403
 404           To compile this driver as a module, choose M here: the
 405           module will be called qdio.
 406
 407           If unsure, say Y.
 408
 409 config CHSC_SCH
 410         def_tristate m
 411         prompt "Support for CHSC subchannels"
 412         help
 413           This driver allows usage of CHSC subchannels. A CHSC subchannel
 414           is usually present on LPAR only.
 415           The driver creates a device /dev/chsc, which may be used to
 416           obtain I/O configuration information about the machine and
 417           to issue asynchronous chsc commands (DANGEROUS).
 418           You will usually only want to use this interface on a special
 419           LPAR designated for system management.
 420
 421           To compile this driver as a module, choose M here: the
 422           module will be called chsc_sch.
 423
 424           If unsure, say N.
 425
 426 comment "Misc"
 427
 428 source "fs/Kconfig.binfmt"
 429
 430 config FORCE_MAX_ZONEORDER
 431         int
 432         default "9"
 433
 434 config PFAULT
 435         def_bool y
 436         prompt "Pseudo page fault support"
 437         help
 438           Select this option, if you want to use PFAULT pseudo page fault
 439           handling under VM. If running native or in LPAR, this option
 440           has no effect. If your VM does not support PFAULT, PAGEEX
 441           pseudo page fault handling will be used.
 442           Note that VM 4.2 supports PFAULT but has a bug in its
 443           implementation that causes some problems.
 444           Everybody who wants to run Linux under VM != VM4.2 should select
 445           this option.
 446
 447 config SHARED_KERNEL
 448         def_bool y
 449         prompt "VM shared kernel support"
 450         help
 451           Select this option, if you want to share the text segment of the
 452           Linux kernel between different VM guests. This reduces memory
 453           usage with lots of guests but greatly increases kernel size.
 454           Also if a kernel was IPL'ed from a shared segment the kexec system
 455           call will not work.
 456           You should only select this option if you know what you are
 457           doing and want to exploit this feature.
 458
 459 config CMM
 460         def_tristate n
 461         prompt "Cooperative memory management"
 462         help
 463           Select this option, if you want to enable the kernel interface
 464           to reduce the memory size of the system. This is accomplished
 465           by allocating pages of memory and put them "on hold". This only
 466           makes sense for a system running under VM where the unused pages
 467           will be reused by VM for other guest systems. The interface
 468           allows an external monitor to balance memory of many systems.
 469           Everybody who wants to run Linux under VM should select this
 470           option.
 471
 472 config CMM_IUCV
 473         def_bool y
 474         prompt "IUCV special message interface to cooperative memory management"
 475         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 476         help
 477           Select this option to enable the special message interface to
 478           the cooperative memory management.
 479
 480 config APPLDATA_BASE
 481         def_bool n
 482         prompt "Linux - VM Monitor Stream, base infrastructure"
 483         depends on PROC_FS
 484         help
 485           This provides a kernel interface for creating and updating z/VM APPLDATA
 486           monitor records. The monitor records are updated at certain time
 487           intervals, once the timer is started.
 488           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 489           i.e. enables or disables monitoring on the Linux side.
 490           A custom interval value (in seconds) can be written to
 491           /proc/appldata/interval.
 492
 493           Defaults are 60 seconds interval and timer off.
 494           The /proc entries can also be read from, showing the current settings.
 495
 496 config APPLDATA_MEM
 497         def_tristate m
 498         prompt "Monitor memory management statistics"
 499         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 500         help
 501           This provides memory management related data to the Linux - VM Monitor
 502           Stream, like paging/swapping rate, memory utilisation, etc.
 503           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 504           APPLDATA monitor record, i.e. enables or disables monitoring this record
 505           on the z/VM side.
 506
 507           Default is disabled.
 508           The /proc entry can also be read from, showing the current settings.
 509
 510           This can also be compiled as a module, which will be called
 511           appldata_mem.o.
 512
 513 config APPLDATA_OS
 514         def_tristate m
 515         prompt "Monitor OS statistics"
 516         depends on APPLDATA_BASE
 517         help
 518           This provides OS related data to the Linux - VM Monitor Stream, like
 519           CPU utilisation, etc.
 520           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 521           APPLDATA monitor record, i.e. enables or disables monitoring this record
 522           on the z/VM side.
 523
 524           Default is disabled.
 525           This can also be compiled as a module, which will be called
 526           appldata_os.o.
 527
 528 config APPLDATA_NET_SUM
 529         def_tristate m
 530         prompt "Monitor overall network statistics"
 531         depends on APPLDATA_BASE && NET
 532         help
 533           This provides network related data to the Linux - VM Monitor Stream,
 534           currently there is only a total sum of network I/O statistics, no
 535           per-interface data.
 536           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 537           APPLDATA monitor record, i.e. enables or disables monitoring this record
 538           on the z/VM side.
 539
 540           Default is disabled.
 541           This can also be compiled as a module, which will be called
 542           appldata_net_sum.o.
 543
 544 source kernel/Kconfig.hz
 545
 546 config S390_HYPFS_FS
 547         def_bool y
 548         prompt "s390 hypervisor file system support"
 549         select SYS_HYPERVISOR
 550         help
 551           This is a virtual file system intended to provide accounting
 552           information in an s390 hypervisor environment.
 553
 554 config KEXEC
 555         def_bool n
 556         prompt "kexec system call"
 557         help
 558           kexec is a system call that implements the ability to shutdown your
 559           current kernel, and to start another kernel.  It is like a reboot
 560           but is independent of hardware/microcode support.
 561
 562 config CRASH_DUMP
 563         bool "kernel crash dumps"
 564         depends on 64BIT && SMP
 565         select KEXEC
 566         help
 567           Generate crash dump after being started by kexec.
 568           Crash dump kernels are loaded in the main kernel with kexec-tools
 569           into a specially reserved region and then later executed after
 570           a crash by kdump/kexec.
 571           For more details see Documentation/kdump/kdump.txt
 572
 573 config ZFCPDUMP
 574         def_bool n
 575         prompt "zfcpdump support"
 576         select SMP
 577         help
 578           Select this option if you want to build an zfcpdump enabled kernel.
 579           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 580
 581 config S390_GUEST
 582         def_bool y
 583         prompt "s390 guest support for KVM (EXPERIMENTAL)"
 584         depends on 64BIT && EXPERIMENTAL
 585         select VIRTUALIZATION
 586         select VIRTIO
 587         select VIRTIO_RING
 588         select VIRTIO_CONSOLE
 589         help
 590           Select this option if you want to run the kernel as a guest under
 591           the KVM hypervisor. This will add detection for KVM as well  as a
 592           virtio transport. If KVM is detected, the virtio console will be
 593           the default console.
 594
 595 config SECCOMP
 596         def_bool y
 597         prompt "Enable seccomp to safely compute untrusted bytecode"
 598         depends on PROC_FS
 599         help
 600           This kernel feature is useful for number crunching applications
 601           that may need to compute untrusted bytecode during their
 602           execution. By using pipes or other transports made available to
 603           the process as file descriptors supporting the read/write
 604           syscalls, it's possible to isolate those applications in
 605           their own address space using seccomp. Once seccomp is
 606           enabled via /proc/<pid>/seccomp, it cannot be disabled
 607           and the task is only allowed to execute a few safe syscalls
 608           defined by each seccomp mode.
 609
 610           If unsure, say Y.
 611
 612 endmenu
 613
 614 menu "Power Management"
 615
 616 source "kernel/power/Kconfig"
 617
 618 endmenu
 619
 620 source "net/Kconfig"
 621
 622 config PCMCIA
 623         def_bool n
 624
 625 config CCW
 626         def_bool y
 627
 628 source "drivers/Kconfig"
 629
 630 source "fs/Kconfig"
 631
 632 source "arch/s390/Kconfig.debug"
 633
 634 source "security/Kconfig"
 635
 636 source "crypto/Kconfig"
 637
 638 source "lib/Kconfig"
 639
 640 source "arch/s390/kvm/Kconfig"