1config MMU 2 def_bool y 3 4config ZONE_DMA 5 def_bool y 6 7config LOCKDEP_SUPPORT 8 def_bool y 9 10config STACKTRACE_SUPPORT 11 def_bool y 12 13config HAVE_LATENCYTOP_SUPPORT 14 def_bool y 15 16config RWSEM_GENERIC_SPINLOCK 17 bool 18 19config RWSEM_XCHGADD_ALGORITHM 20 def_bool y 21 22config ARCH_HAS_ILOG2_U32 23 def_bool n 24 25config ARCH_HAS_ILOG2_U64 26 def_bool n 27 28config GENERIC_HWEIGHT 29 def_bool y 30 31config GENERIC_BUG 32 def_bool y if BUG 33 34config GENERIC_BUG_RELATIVE_POINTERS 35 def_bool y 36 37config NO_IOMEM 38 def_bool y 39 40config NO_DMA 41 def_bool y 42 43config ARCH_DMA_ADDR_T_64BIT 44 def_bool 64BIT 45 46config GENERIC_LOCKBREAK 47 def_bool y if SMP && PREEMPT 48 49config PGSTE 50 def_bool y if KVM 51 52config ARCH_SUPPORTS_DEBUG_PAGEALLOC 53 def_bool y 54 55config KEXEC 56 def_bool y 57 58config AUDIT_ARCH 59 def_bool y 60 61config S390 62 def_bool y 63 select USE_GENERIC_SMP_HELPERS if SMP 64 select GENERIC_CPU_DEVICES if !SMP 65 select HAVE_SYSCALL_WRAPPERS 66 select HAVE_FUNCTION_TRACER 67 select HAVE_FUNCTION_TRACE_MCOUNT_TEST 68 select HAVE_FTRACE_MCOUNT_RECORD 69 select HAVE_C_RECORDMCOUNT 70 select HAVE_SYSCALL_TRACEPOINTS 71 select SYSCTL_EXCEPTION_TRACE 72 select HAVE_DYNAMIC_FTRACE 73 select HAVE_FUNCTION_GRAPH_TRACER 74 select HAVE_REGS_AND_STACK_ACCESS_API 75 select HAVE_OPROFILE 76 select HAVE_KPROBES 77 select HAVE_KRETPROBES 78 select HAVE_KVM if 64BIT 79 select HAVE_ARCH_TRACEHOOK 80 select INIT_ALL_POSSIBLE 81 select HAVE_IRQ_WORK 82 select HAVE_PERF_EVENTS 83 select ARCH_HAVE_NMI_SAFE_CMPXCHG 84 select HAVE_DEBUG_KMEMLEAK 85 select HAVE_KERNEL_GZIP 86 select HAVE_KERNEL_BZIP2 87 select HAVE_KERNEL_LZMA 88 select HAVE_KERNEL_LZO 89 select HAVE_KERNEL_XZ 90 select HAVE_ARCH_MUTEX_CPU_RELAX 91 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5 92 select HAVE_BPF_JIT if 64BIT && PACK_STACK 93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION 94 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 95 select HAVE_MEMBLOCK 96 select HAVE_MEMBLOCK_NODE_MAP 97 select HAVE_CMPXCHG_LOCAL 98 select HAVE_CMPXCHG_DOUBLE 99 select HAVE_VIRT_CPU_ACCOUNTING 100 select VIRT_CPU_ACCOUNTING 101 select ARCH_DISCARD_MEMBLOCK 102 select BUILDTIME_EXTABLE_SORT 103 select ARCH_INLINE_SPIN_TRYLOCK 104 select ARCH_INLINE_SPIN_TRYLOCK_BH 105 select ARCH_INLINE_SPIN_LOCK 106 select ARCH_INLINE_SPIN_LOCK_BH 107 select ARCH_INLINE_SPIN_LOCK_IRQ 108 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 109 select ARCH_INLINE_SPIN_UNLOCK 110 select ARCH_INLINE_SPIN_UNLOCK_BH 111 select ARCH_INLINE_SPIN_UNLOCK_IRQ 112 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 113 select ARCH_INLINE_READ_TRYLOCK 114 select ARCH_INLINE_READ_LOCK 115 select ARCH_INLINE_READ_LOCK_BH 116 select ARCH_INLINE_READ_LOCK_IRQ 117 select ARCH_INLINE_READ_LOCK_IRQSAVE 118 select ARCH_INLINE_READ_UNLOCK 119 select ARCH_INLINE_READ_UNLOCK_BH 120 select ARCH_INLINE_READ_UNLOCK_IRQ 121 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 122 select ARCH_INLINE_WRITE_TRYLOCK 123 select ARCH_INLINE_WRITE_LOCK 124 select ARCH_INLINE_WRITE_LOCK_BH 125 select ARCH_INLINE_WRITE_LOCK_IRQ 126 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 127 select ARCH_INLINE_WRITE_UNLOCK 128 select ARCH_INLINE_WRITE_UNLOCK_BH 129 select ARCH_INLINE_WRITE_UNLOCK_IRQ 130 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 131 select HAVE_UID16 if 32BIT 132 select ARCH_WANT_IPC_PARSE_VERSION 133 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT 134 select GENERIC_SMP_IDLE_THREAD 135 select GENERIC_TIME_VSYSCALL_OLD 136 select GENERIC_CLOCKEVENTS 137 select KTIME_SCALAR if 32BIT 138 select HAVE_ARCH_SECCOMP_FILTER 139 select GENERIC_KERNEL_THREAD 140 select HAVE_MOD_ARCH_SPECIFIC 141 select MODULES_USE_ELF_RELA 142 143config SCHED_OMIT_FRAME_POINTER 144 def_bool y 145 146source "init/Kconfig" 147 148source "kernel/Kconfig.freezer" 149 150menu "Processor type and features" 151 152config HAVE_MARCH_Z900_FEATURES 153 def_bool n 154 155config HAVE_MARCH_Z990_FEATURES 156 def_bool n 157 select HAVE_MARCH_Z900_FEATURES 158 159config HAVE_MARCH_Z9_109_FEATURES 160 def_bool n 161 select HAVE_MARCH_Z990_FEATURES 162 163config HAVE_MARCH_Z10_FEATURES 164 def_bool n 165 select HAVE_MARCH_Z9_109_FEATURES 166 167config HAVE_MARCH_Z196_FEATURES 168 def_bool n 169 select HAVE_MARCH_Z10_FEATURES 170 171choice 172 prompt "Processor type" 173 default MARCH_G5 174 175config MARCH_G5 176 bool "System/390 model G5 and G6" 177 depends on !64BIT 178 help 179 Select this to build a 31 bit kernel that works 180 on all ESA/390 and z/Architecture machines. 181 182config MARCH_Z900 183 bool "IBM zSeries model z800 and z900" 184 select HAVE_MARCH_Z900_FEATURES if 64BIT 185 help 186 Select this to enable optimizations for model z800/z900 (2064 and 187 2066 series). This will enable some optimizations that are not 188 available on older ESA/390 (31 Bit) only CPUs. 189 190config MARCH_Z990 191 bool "IBM zSeries model z890 and z990" 192 select HAVE_MARCH_Z990_FEATURES if 64BIT 193 help 194 Select this to enable optimizations for model z890/z990 (2084 and 195 2086 series). The kernel will be slightly faster but will not work 196 on older machines. 197 198config MARCH_Z9_109 199 bool "IBM System z9" 200 select HAVE_MARCH_Z9_109_FEATURES if 64BIT 201 help 202 Select this to enable optimizations for IBM System z9 (2094 and 203 2096 series). The kernel will be slightly faster but will not work 204 on older machines. 205 206config MARCH_Z10 207 bool "IBM System z10" 208 select HAVE_MARCH_Z10_FEATURES if 64BIT 209 help 210 Select this to enable optimizations for IBM System z10 (2097 and 211 2098 series). The kernel will be slightly faster but will not work 212 on older machines. 213 214config MARCH_Z196 215 bool "IBM zEnterprise 114 and 196" 216 select HAVE_MARCH_Z196_FEATURES if 64BIT 217 help 218 Select this to enable optimizations for IBM zEnterprise 114 and 196 219 (2818 and 2817 series). The kernel will be slightly faster but will 220 not work on older machines. 221 222endchoice 223 224config 64BIT 225 def_bool y 226 prompt "64 bit kernel" 227 help 228 Select this option if you have an IBM z/Architecture machine 229 and want to use the 64 bit addressing mode. 230 231config 32BIT 232 def_bool y if !64BIT 233 234config COMPAT 235 def_bool y 236 prompt "Kernel support for 31 bit emulation" 237 depends on 64BIT 238 select COMPAT_BINFMT_ELF if BINFMT_ELF 239 select ARCH_WANT_OLD_COMPAT_IPC 240 help 241 Select this option if you want to enable your system kernel to 242 handle system-calls from ELF binaries for 31 bit ESA. This option 243 (and some other stuff like libraries and such) is needed for 244 executing 31 bit applications. It is safe to say "Y". 245 246config SYSVIPC_COMPAT 247 def_bool y if COMPAT && SYSVIPC 248 249config KEYS_COMPAT 250 def_bool y if COMPAT && KEYS 251 252config SMP 253 def_bool y 254 prompt "Symmetric multi-processing support" 255 ---help--- 256 This enables support for systems with more than one CPU. If you have 257 a system with only one CPU, like most personal computers, say N. If 258 you have a system with more than one CPU, say Y. 259 260 If you say N here, the kernel will run on single and multiprocessor 261 machines, but will use only one CPU of a multiprocessor machine. If 262 you say Y here, the kernel will run on many, but not all, 263 singleprocessor machines. On a singleprocessor machine, the kernel 264 will run faster if you say N here. 265 266 See also the SMP-HOWTO available at 267 <http://www.tldp.org/docs.html#howto>. 268 269 Even if you don't know what to do here, say Y. 270 271config NR_CPUS 272 int "Maximum number of CPUs (2-64)" 273 range 2 64 274 depends on SMP 275 default "32" if !64BIT 276 default "64" if 64BIT 277 help 278 This allows you to specify the maximum number of CPUs which this 279 kernel will support. The maximum supported value is 64 and the 280 minimum value which makes sense is 2. 281 282 This is purely to save memory - each supported CPU adds 283 approximately sixteen kilobytes to the kernel image. 284 285config HOTPLUG_CPU 286 def_bool y 287 prompt "Support for hot-pluggable CPUs" 288 depends on SMP 289 select HOTPLUG 290 help 291 Say Y here to be able to turn CPUs off and on. CPUs 292 can be controlled through /sys/devices/system/cpu/cpu#. 293 Say N if you want to disable CPU hotplug. 294 295config SCHED_MC 296 def_bool n 297 298config SCHED_BOOK 299 def_bool y 300 prompt "Book scheduler support" 301 depends on SMP 302 select SCHED_MC 303 help 304 Book scheduler support improves the CPU scheduler's decision making 305 when dealing with machines that have several books. 306 307source kernel/Kconfig.preempt 308 309config MATHEMU 310 def_bool y 311 prompt "IEEE FPU emulation" 312 depends on MARCH_G5 313 help 314 This option is required for IEEE compliant floating point arithmetic 315 on older ESA/390 machines. Say Y unless you know your machine doesn't 316 need this. 317 318source kernel/Kconfig.hz 319 320endmenu 321 322menu "Memory setup" 323 324config ARCH_SPARSEMEM_ENABLE 325 def_bool y 326 select SPARSEMEM_VMEMMAP_ENABLE 327 select SPARSEMEM_VMEMMAP 328 select SPARSEMEM_STATIC if !64BIT 329 330config ARCH_SPARSEMEM_DEFAULT 331 def_bool y 332 333config ARCH_SELECT_MEMORY_MODEL 334 def_bool y 335 336config ARCH_ENABLE_MEMORY_HOTPLUG 337 def_bool y if SPARSEMEM 338 339config ARCH_ENABLE_MEMORY_HOTREMOVE 340 def_bool y 341 342config FORCE_MAX_ZONEORDER 343 int 344 default "9" 345 346source "mm/Kconfig" 347 348config PACK_STACK 349 def_bool y 350 prompt "Pack kernel stack" 351 help 352 This option enables the compiler option -mkernel-backchain if it 353 is available. If the option is available the compiler supports 354 the new stack layout which dramatically reduces the minimum stack 355 frame size. With an old compiler a non-leaf function needs a 356 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With 357 -mkernel-backchain the minimum size drops to 16 byte on 31 bit 358 and 24 byte on 64 bit. 359 360 Say Y if you are unsure. 361 362config SMALL_STACK 363 def_bool n 364 prompt "Use 8kb for kernel stack instead of 16kb" 365 depends on PACK_STACK && 64BIT && !LOCKDEP 366 help 367 If you say Y here and the compiler supports the -mkernel-backchain 368 option the kernel will use a smaller kernel stack size. The reduced 369 size is 8kb instead of 16kb. This allows to run more threads on a 370 system and reduces the pressure on the memory management for higher 371 order page allocations. 372 373 Say N if you are unsure. 374 375config CHECK_STACK 376 def_bool y 377 prompt "Detect kernel stack overflow" 378 help 379 This option enables the compiler option -mstack-guard and 380 -mstack-size if they are available. If the compiler supports them 381 it will emit additional code to each function prolog to trigger 382 an illegal operation if the kernel stack is about to overflow. 383 384 Say N if you are unsure. 385 386config STACK_GUARD 387 int "Size of the guard area (128-1024)" 388 range 128 1024 389 depends on CHECK_STACK 390 default "256" 391 help 392 This allows you to specify the size of the guard area at the lower 393 end of the kernel stack. If the kernel stack points into the guard 394 area on function entry an illegal operation is triggered. The size 395 needs to be a power of 2. Please keep in mind that the size of an 396 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 397 The minimum size for the stack guard should be 256 for 31 bit and 398 512 for 64 bit. 399 400config WARN_DYNAMIC_STACK 401 def_bool n 402 prompt "Emit compiler warnings for function with dynamic stack usage" 403 help 404 This option enables the compiler option -mwarn-dynamicstack. If the 405 compiler supports this options generates warnings for functions 406 that dynamically allocate stack space using alloca. 407 408 Say N if you are unsure. 409 410endmenu 411 412menu "I/O subsystem" 413 414config QDIO 415 def_tristate y 416 prompt "QDIO support" 417 ---help--- 418 This driver provides the Queued Direct I/O base support for 419 IBM System z. 420 421 To compile this driver as a module, choose M here: the 422 module will be called qdio. 423 424 If unsure, say Y. 425 426config CHSC_SCH 427 def_tristate m 428 prompt "Support for CHSC subchannels" 429 help 430 This driver allows usage of CHSC subchannels. A CHSC subchannel 431 is usually present on LPAR only. 432 The driver creates a device /dev/chsc, which may be used to 433 obtain I/O configuration information about the machine and 434 to issue asynchronous chsc commands (DANGEROUS). 435 You will usually only want to use this interface on a special 436 LPAR designated for system management. 437 438 To compile this driver as a module, choose M here: the 439 module will be called chsc_sch. 440 441 If unsure, say N. 442 443config SCM_BUS 444 def_bool y 445 depends on 64BIT 446 prompt "SCM bus driver" 447 help 448 Bus driver for Storage Class Memory. 449 450config EADM_SCH 451 def_tristate m 452 prompt "Support for EADM subchannels" 453 depends on SCM_BUS 454 help 455 This driver allows usage of EADM subchannels. EADM subchannels act 456 as a communication vehicle for SCM increments. 457 458 To compile this driver as a module, choose M here: the 459 module will be called eadm_sch. 460 461endmenu 462 463menu "Dump support" 464 465config CRASH_DUMP 466 bool "kernel crash dumps" 467 depends on 64BIT && SMP 468 select KEXEC 469 help 470 Generate crash dump after being started by kexec. 471 Crash dump kernels are loaded in the main kernel with kexec-tools 472 into a specially reserved region and then later executed after 473 a crash by kdump/kexec. 474 For more details see Documentation/kdump/kdump.txt 475 476config ZFCPDUMP 477 def_bool n 478 prompt "zfcpdump support" 479 select SMP 480 help 481 Select this option if you want to build an zfcpdump enabled kernel. 482 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. 483 484endmenu 485 486menu "Executable file formats / Emulations" 487 488source "fs/Kconfig.binfmt" 489 490config SECCOMP 491 def_bool y 492 prompt "Enable seccomp to safely compute untrusted bytecode" 493 depends on PROC_FS 494 help 495 This kernel feature is useful for number crunching applications 496 that may need to compute untrusted bytecode during their 497 execution. By using pipes or other transports made available to 498 the process as file descriptors supporting the read/write 499 syscalls, it's possible to isolate those applications in 500 their own address space using seccomp. Once seccomp is 501 enabled via /proc/<pid>/seccomp, it cannot be disabled 502 and the task is only allowed to execute a few safe syscalls 503 defined by each seccomp mode. 504 505 If unsure, say Y. 506 507endmenu 508 509menu "Power Management" 510 511config ARCH_HIBERNATION_POSSIBLE 512 def_bool y if 64BIT 513 514source "kernel/power/Kconfig" 515 516endmenu 517 518source "net/Kconfig" 519 520config PCMCIA 521 def_bool n 522 523config CCW 524 def_bool y 525 526source "drivers/Kconfig" 527 528source "fs/Kconfig" 529 530source "arch/s390/Kconfig.debug" 531 532source "security/Kconfig" 533 534source "crypto/Kconfig" 535 536source "lib/Kconfig" 537 538menu "Virtualization" 539 540config PFAULT 541 def_bool y 542 prompt "Pseudo page fault support" 543 help 544 Select this option, if you want to use PFAULT pseudo page fault 545 handling under VM. If running native or in LPAR, this option 546 has no effect. If your VM does not support PFAULT, PAGEEX 547 pseudo page fault handling will be used. 548 Note that VM 4.2 supports PFAULT but has a bug in its 549 implementation that causes some problems. 550 Everybody who wants to run Linux under VM != VM4.2 should select 551 this option. 552 553config SHARED_KERNEL 554 bool "VM shared kernel support" 555 depends on !JUMP_LABEL 556 help 557 Select this option, if you want to share the text segment of the 558 Linux kernel between different VM guests. This reduces memory 559 usage with lots of guests but greatly increases kernel size. 560 Also if a kernel was IPL'ed from a shared segment the kexec system 561 call will not work. 562 You should only select this option if you know what you are 563 doing and want to exploit this feature. 564 565config CMM 566 def_tristate n 567 prompt "Cooperative memory management" 568 help 569 Select this option, if you want to enable the kernel interface 570 to reduce the memory size of the system. This is accomplished 571 by allocating pages of memory and put them "on hold". This only 572 makes sense for a system running under VM where the unused pages 573 will be reused by VM for other guest systems. The interface 574 allows an external monitor to balance memory of many systems. 575 Everybody who wants to run Linux under VM should select this 576 option. 577 578config CMM_IUCV 579 def_bool y 580 prompt "IUCV special message interface to cooperative memory management" 581 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 582 help 583 Select this option to enable the special message interface to 584 the cooperative memory management. 585 586config APPLDATA_BASE 587 def_bool n 588 prompt "Linux - VM Monitor Stream, base infrastructure" 589 depends on PROC_FS 590 help 591 This provides a kernel interface for creating and updating z/VM APPLDATA 592 monitor records. The monitor records are updated at certain time 593 intervals, once the timer is started. 594 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 595 i.e. enables or disables monitoring on the Linux side. 596 A custom interval value (in seconds) can be written to 597 /proc/appldata/interval. 598 599 Defaults are 60 seconds interval and timer off. 600 The /proc entries can also be read from, showing the current settings. 601 602config APPLDATA_MEM 603 def_tristate m 604 prompt "Monitor memory management statistics" 605 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 606 help 607 This provides memory management related data to the Linux - VM Monitor 608 Stream, like paging/swapping rate, memory utilisation, etc. 609 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 610 APPLDATA monitor record, i.e. enables or disables monitoring this record 611 on the z/VM side. 612 613 Default is disabled. 614 The /proc entry can also be read from, showing the current settings. 615 616 This can also be compiled as a module, which will be called 617 appldata_mem.o. 618 619config APPLDATA_OS 620 def_tristate m 621 prompt "Monitor OS statistics" 622 depends on APPLDATA_BASE 623 help 624 This provides OS related data to the Linux - VM Monitor Stream, like 625 CPU utilisation, etc. 626 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 627 APPLDATA monitor record, i.e. enables or disables monitoring this record 628 on the z/VM side. 629 630 Default is disabled. 631 This can also be compiled as a module, which will be called 632 appldata_os.o. 633 634config APPLDATA_NET_SUM 635 def_tristate m 636 prompt "Monitor overall network statistics" 637 depends on APPLDATA_BASE && NET 638 help 639 This provides network related data to the Linux - VM Monitor Stream, 640 currently there is only a total sum of network I/O statistics, no 641 per-interface data. 642 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 643 APPLDATA monitor record, i.e. enables or disables monitoring this record 644 on the z/VM side. 645 646 Default is disabled. 647 This can also be compiled as a module, which will be called 648 appldata_net_sum.o. 649 650config S390_HYPFS_FS 651 def_bool y 652 prompt "s390 hypervisor file system support" 653 select SYS_HYPERVISOR 654 help 655 This is a virtual file system intended to provide accounting 656 information in an s390 hypervisor environment. 657 658source "arch/s390/kvm/Kconfig" 659 660config S390_GUEST 661 def_bool y 662 prompt "s390 support for virtio devices (EXPERIMENTAL)" 663 depends on 64BIT && EXPERIMENTAL 664 select VIRTUALIZATION 665 select VIRTIO 666 select VIRTIO_CONSOLE 667 help 668 Enabling this option adds support for virtio based paravirtual device 669 drivers on s390. 670 671 Select this option if you want to run the kernel as a guest under 672 the KVM hypervisor. 673 674endmenu 675