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 ARCH_DMA_ADDR_T_64BIT 38 def_bool 64BIT 39 40config GENERIC_LOCKBREAK 41 def_bool y if SMP && PREEMPT 42 43config PGSTE 44 def_bool y if KVM 45 46config ARCH_SUPPORTS_DEBUG_PAGEALLOC 47 def_bool y 48 49config KEXEC 50 def_bool y 51 52config AUDIT_ARCH 53 def_bool y 54 55config NO_IOPORT 56 def_bool y 57 58config PCI_QUIRKS 59 def_bool n 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_PERF_EVENTS 82 select ARCH_HAVE_NMI_SAFE_CMPXCHG 83 select HAVE_DEBUG_KMEMLEAK 84 select HAVE_KERNEL_GZIP 85 select HAVE_KERNEL_BZIP2 86 select HAVE_KERNEL_LZMA 87 select HAVE_KERNEL_LZO 88 select HAVE_KERNEL_XZ 89 select HAVE_ARCH_MUTEX_CPU_RELAX 90 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5 91 select HAVE_BPF_JIT if 64BIT && PACK_STACK 92 select ARCH_SAVE_PAGE_KEYS if HIBERNATION 93 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 94 select HAVE_MEMBLOCK 95 select HAVE_MEMBLOCK_NODE_MAP 96 select HAVE_CMPXCHG_LOCAL 97 select HAVE_CMPXCHG_DOUBLE 98 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 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 HAVE_MOD_ARCH_SPECIFIC 140 select MODULES_USE_ELF_RELA 141 select CLONE_BACKWARDS2 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 171config HAVE_MARCH_ZEC12_FEATURES 172 def_bool n 173 select HAVE_MARCH_Z196_FEATURES 174 175choice 176 prompt "Processor type" 177 default MARCH_G5 178 179config MARCH_G5 180 bool "System/390 model G5 and G6" 181 depends on !64BIT 182 help 183 Select this to build a 31 bit kernel that works 184 on all ESA/390 and z/Architecture machines. 185 186config MARCH_Z900 187 bool "IBM zSeries model z800 and z900" 188 select HAVE_MARCH_Z900_FEATURES if 64BIT 189 help 190 Select this to enable optimizations for model z800/z900 (2064 and 191 2066 series). This will enable some optimizations that are not 192 available on older ESA/390 (31 Bit) only CPUs. 193 194config MARCH_Z990 195 bool "IBM zSeries model z890 and z990" 196 select HAVE_MARCH_Z990_FEATURES if 64BIT 197 help 198 Select this to enable optimizations for model z890/z990 (2084 and 199 2086 series). The kernel will be slightly faster but will not work 200 on older machines. 201 202config MARCH_Z9_109 203 bool "IBM System z9" 204 select HAVE_MARCH_Z9_109_FEATURES if 64BIT 205 help 206 Select this to enable optimizations for IBM System z9 (2094 and 207 2096 series). The kernel will be slightly faster but will not work 208 on older machines. 209 210config MARCH_Z10 211 bool "IBM System z10" 212 select HAVE_MARCH_Z10_FEATURES if 64BIT 213 help 214 Select this to enable optimizations for IBM System z10 (2097 and 215 2098 series). The kernel will be slightly faster but will not work 216 on older machines. 217 218config MARCH_Z196 219 bool "IBM zEnterprise 114 and 196" 220 select HAVE_MARCH_Z196_FEATURES if 64BIT 221 help 222 Select this to enable optimizations for IBM zEnterprise 114 and 196 223 (2818 and 2817 series). The kernel will be slightly faster but will 224 not work on older machines. 225 226config MARCH_ZEC12 227 bool "IBM zEC12" 228 select HAVE_MARCH_ZEC12_FEATURES if 64BIT 229 help 230 Select this to enable optimizations for IBM zEC12 (2827 series). The 231 kernel will be slightly faster but will not work on older machines. 232 233endchoice 234 235config 64BIT 236 def_bool y 237 prompt "64 bit kernel" 238 help 239 Select this option if you have an IBM z/Architecture machine 240 and want to use the 64 bit addressing mode. 241 242config 32BIT 243 def_bool y if !64BIT 244 245config COMPAT 246 def_bool y 247 prompt "Kernel support for 31 bit emulation" 248 depends on 64BIT 249 select COMPAT_BINFMT_ELF if BINFMT_ELF 250 select ARCH_WANT_OLD_COMPAT_IPC 251 help 252 Select this option if you want to enable your system kernel to 253 handle system-calls from ELF binaries for 31 bit ESA. This option 254 (and some other stuff like libraries and such) is needed for 255 executing 31 bit applications. It is safe to say "Y". 256 257config SYSVIPC_COMPAT 258 def_bool y if COMPAT && SYSVIPC 259 260config KEYS_COMPAT 261 def_bool y if COMPAT && KEYS 262 263config SMP 264 def_bool y 265 prompt "Symmetric multi-processing support" 266 ---help--- 267 This enables support for systems with more than one CPU. If you have 268 a system with only one CPU, like most personal computers, say N. If 269 you have a system with more than one CPU, say Y. 270 271 If you say N here, the kernel will run on single and multiprocessor 272 machines, but will use only one CPU of a multiprocessor machine. If 273 you say Y here, the kernel will run on many, but not all, 274 singleprocessor machines. On a singleprocessor machine, the kernel 275 will run faster if you say N here. 276 277 See also the SMP-HOWTO available at 278 <http://www.tldp.org/docs.html#howto>. 279 280 Even if you don't know what to do here, say Y. 281 282config NR_CPUS 283 int "Maximum number of CPUs (2-64)" 284 range 2 64 285 depends on SMP 286 default "32" if !64BIT 287 default "64" if 64BIT 288 help 289 This allows you to specify the maximum number of CPUs which this 290 kernel will support. The maximum supported value is 64 and the 291 minimum value which makes sense is 2. 292 293 This is purely to save memory - each supported CPU adds 294 approximately sixteen kilobytes to the kernel image. 295 296config HOTPLUG_CPU 297 def_bool y 298 prompt "Support for hot-pluggable CPUs" 299 depends on SMP 300 select HOTPLUG 301 help 302 Say Y here to be able to turn CPUs off and on. CPUs 303 can be controlled through /sys/devices/system/cpu/cpu#. 304 Say N if you want to disable CPU hotplug. 305 306config SCHED_MC 307 def_bool n 308 309config SCHED_BOOK 310 def_bool y 311 prompt "Book scheduler support" 312 depends on SMP 313 select SCHED_MC 314 help 315 Book scheduler support improves the CPU scheduler's decision making 316 when dealing with machines that have several books. 317 318source kernel/Kconfig.preempt 319 320config MATHEMU 321 def_bool y 322 prompt "IEEE FPU emulation" 323 depends on MARCH_G5 324 help 325 This option is required for IEEE compliant floating point arithmetic 326 on older ESA/390 machines. Say Y unless you know your machine doesn't 327 need this. 328 329source kernel/Kconfig.hz 330 331endmenu 332 333menu "Memory setup" 334 335config ARCH_SPARSEMEM_ENABLE 336 def_bool y 337 select SPARSEMEM_VMEMMAP_ENABLE 338 select SPARSEMEM_VMEMMAP 339 select SPARSEMEM_STATIC if !64BIT 340 341config ARCH_SPARSEMEM_DEFAULT 342 def_bool y 343 344config ARCH_SELECT_MEMORY_MODEL 345 def_bool y 346 347config ARCH_ENABLE_MEMORY_HOTPLUG 348 def_bool y if SPARSEMEM 349 350config ARCH_ENABLE_MEMORY_HOTREMOVE 351 def_bool y 352 353config FORCE_MAX_ZONEORDER 354 int 355 default "9" 356 357source "mm/Kconfig" 358 359config PACK_STACK 360 def_bool y 361 prompt "Pack kernel stack" 362 help 363 This option enables the compiler option -mkernel-backchain if it 364 is available. If the option is available the compiler supports 365 the new stack layout which dramatically reduces the minimum stack 366 frame size. With an old compiler a non-leaf function needs a 367 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With 368 -mkernel-backchain the minimum size drops to 16 byte on 31 bit 369 and 24 byte on 64 bit. 370 371 Say Y if you are unsure. 372 373config SMALL_STACK 374 def_bool n 375 prompt "Use 8kb for kernel stack instead of 16kb" 376 depends on PACK_STACK && 64BIT && !LOCKDEP 377 help 378 If you say Y here and the compiler supports the -mkernel-backchain 379 option the kernel will use a smaller kernel stack size. The reduced 380 size is 8kb instead of 16kb. This allows to run more threads on a 381 system and reduces the pressure on the memory management for higher 382 order page allocations. 383 384 Say N if you are unsure. 385 386config CHECK_STACK 387 def_bool y 388 prompt "Detect kernel stack overflow" 389 help 390 This option enables the compiler option -mstack-guard and 391 -mstack-size if they are available. If the compiler supports them 392 it will emit additional code to each function prolog to trigger 393 an illegal operation if the kernel stack is about to overflow. 394 395 Say N if you are unsure. 396 397config STACK_GUARD 398 int "Size of the guard area (128-1024)" 399 range 128 1024 400 depends on CHECK_STACK 401 default "256" 402 help 403 This allows you to specify the size of the guard area at the lower 404 end of the kernel stack. If the kernel stack points into the guard 405 area on function entry an illegal operation is triggered. The size 406 needs to be a power of 2. Please keep in mind that the size of an 407 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 408 The minimum size for the stack guard should be 256 for 31 bit and 409 512 for 64 bit. 410 411config WARN_DYNAMIC_STACK 412 def_bool n 413 prompt "Emit compiler warnings for function with dynamic stack usage" 414 help 415 This option enables the compiler option -mwarn-dynamicstack. If the 416 compiler supports this options generates warnings for functions 417 that dynamically allocate stack space using alloca. 418 419 Say N if you are unsure. 420 421endmenu 422 423menu "I/O subsystem" 424 425config QDIO 426 def_tristate y 427 prompt "QDIO support" 428 ---help--- 429 This driver provides the Queued Direct I/O base support for 430 IBM System z. 431 432 To compile this driver as a module, choose M here: the 433 module will be called qdio. 434 435 If unsure, say Y. 436 437menuconfig PCI 438 bool "PCI support" 439 default n 440 depends on 64BIT 441 select ARCH_SUPPORTS_MSI 442 select PCI_MSI 443 help 444 Enable PCI support. 445 446if PCI 447 448config PCI_NR_FUNCTIONS 449 int "Maximum number of PCI functions (1-4096)" 450 range 1 4096 451 default "64" 452 help 453 This allows you to specify the maximum number of PCI functions which 454 this kernel will support. 455 456source "drivers/pci/Kconfig" 457source "drivers/pci/pcie/Kconfig" 458source "drivers/pci/hotplug/Kconfig" 459 460endif # PCI 461 462config PCI_DOMAINS 463 def_bool PCI 464 465config HAS_IOMEM 466 def_bool PCI 467 468config IOMMU_HELPER 469 def_bool PCI 470 471config HAS_DMA 472 def_bool PCI 473 select HAVE_DMA_API_DEBUG 474 475config NEED_SG_DMA_LENGTH 476 def_bool PCI 477 478config HAVE_DMA_ATTRS 479 def_bool PCI 480 481config NEED_DMA_MAP_STATE 482 def_bool PCI 483 484config CHSC_SCH 485 def_tristate m 486 prompt "Support for CHSC subchannels" 487 help 488 This driver allows usage of CHSC subchannels. A CHSC subchannel 489 is usually present on LPAR only. 490 The driver creates a device /dev/chsc, which may be used to 491 obtain I/O configuration information about the machine and 492 to issue asynchronous chsc commands (DANGEROUS). 493 You will usually only want to use this interface on a special 494 LPAR designated for system management. 495 496 To compile this driver as a module, choose M here: the 497 module will be called chsc_sch. 498 499 If unsure, say N. 500 501config SCM_BUS 502 def_bool y 503 depends on 64BIT 504 prompt "SCM bus driver" 505 help 506 Bus driver for Storage Class Memory. 507 508config EADM_SCH 509 def_tristate m 510 prompt "Support for EADM subchannels" 511 depends on SCM_BUS 512 help 513 This driver allows usage of EADM subchannels. EADM subchannels act 514 as a communication vehicle for SCM increments. 515 516 To compile this driver as a module, choose M here: the 517 module will be called eadm_sch. 518 519endmenu 520 521menu "Dump support" 522 523config CRASH_DUMP 524 bool "kernel crash dumps" 525 depends on 64BIT && SMP 526 select KEXEC 527 help 528 Generate crash dump after being started by kexec. 529 Crash dump kernels are loaded in the main kernel with kexec-tools 530 into a specially reserved region and then later executed after 531 a crash by kdump/kexec. 532 For more details see Documentation/kdump/kdump.txt 533 534config ZFCPDUMP 535 def_bool n 536 prompt "zfcpdump support" 537 select SMP 538 help 539 Select this option if you want to build an zfcpdump enabled kernel. 540 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. 541 542endmenu 543 544menu "Executable file formats / Emulations" 545 546source "fs/Kconfig.binfmt" 547 548config SECCOMP 549 def_bool y 550 prompt "Enable seccomp to safely compute untrusted bytecode" 551 depends on PROC_FS 552 help 553 This kernel feature is useful for number crunching applications 554 that may need to compute untrusted bytecode during their 555 execution. By using pipes or other transports made available to 556 the process as file descriptors supporting the read/write 557 syscalls, it's possible to isolate those applications in 558 their own address space using seccomp. Once seccomp is 559 enabled via /proc/<pid>/seccomp, it cannot be disabled 560 and the task is only allowed to execute a few safe syscalls 561 defined by each seccomp mode. 562 563 If unsure, say Y. 564 565endmenu 566 567menu "Power Management" 568 569config ARCH_HIBERNATION_POSSIBLE 570 def_bool y if 64BIT 571 572source "kernel/power/Kconfig" 573 574endmenu 575 576source "net/Kconfig" 577 578config PCMCIA 579 def_bool n 580 581config CCW 582 def_bool y 583 584source "drivers/Kconfig" 585 586source "fs/Kconfig" 587 588source "arch/s390/Kconfig.debug" 589 590source "security/Kconfig" 591 592source "crypto/Kconfig" 593 594source "lib/Kconfig" 595 596menu "Virtualization" 597 598config PFAULT 599 def_bool y 600 prompt "Pseudo page fault support" 601 help 602 Select this option, if you want to use PFAULT pseudo page fault 603 handling under VM. If running native or in LPAR, this option 604 has no effect. If your VM does not support PFAULT, PAGEEX 605 pseudo page fault handling will be used. 606 Note that VM 4.2 supports PFAULT but has a bug in its 607 implementation that causes some problems. 608 Everybody who wants to run Linux under VM != VM4.2 should select 609 this option. 610 611config SHARED_KERNEL 612 bool "VM shared kernel support" 613 depends on !JUMP_LABEL 614 help 615 Select this option, if you want to share the text segment of the 616 Linux kernel between different VM guests. This reduces memory 617 usage with lots of guests but greatly increases kernel size. 618 Also if a kernel was IPL'ed from a shared segment the kexec system 619 call will not work. 620 You should only select this option if you know what you are 621 doing and want to exploit this feature. 622 623config CMM 624 def_tristate n 625 prompt "Cooperative memory management" 626 help 627 Select this option, if you want to enable the kernel interface 628 to reduce the memory size of the system. This is accomplished 629 by allocating pages of memory and put them "on hold". This only 630 makes sense for a system running under VM where the unused pages 631 will be reused by VM for other guest systems. The interface 632 allows an external monitor to balance memory of many systems. 633 Everybody who wants to run Linux under VM should select this 634 option. 635 636config CMM_IUCV 637 def_bool y 638 prompt "IUCV special message interface to cooperative memory management" 639 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 640 help 641 Select this option to enable the special message interface to 642 the cooperative memory management. 643 644config APPLDATA_BASE 645 def_bool n 646 prompt "Linux - VM Monitor Stream, base infrastructure" 647 depends on PROC_FS 648 help 649 This provides a kernel interface for creating and updating z/VM APPLDATA 650 monitor records. The monitor records are updated at certain time 651 intervals, once the timer is started. 652 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 653 i.e. enables or disables monitoring on the Linux side. 654 A custom interval value (in seconds) can be written to 655 /proc/appldata/interval. 656 657 Defaults are 60 seconds interval and timer off. 658 The /proc entries can also be read from, showing the current settings. 659 660config APPLDATA_MEM 661 def_tristate m 662 prompt "Monitor memory management statistics" 663 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 664 help 665 This provides memory management related data to the Linux - VM Monitor 666 Stream, like paging/swapping rate, memory utilisation, etc. 667 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 668 APPLDATA monitor record, i.e. enables or disables monitoring this record 669 on the z/VM side. 670 671 Default is disabled. 672 The /proc entry can also be read from, showing the current settings. 673 674 This can also be compiled as a module, which will be called 675 appldata_mem.o. 676 677config APPLDATA_OS 678 def_tristate m 679 prompt "Monitor OS statistics" 680 depends on APPLDATA_BASE 681 help 682 This provides OS related data to the Linux - VM Monitor Stream, like 683 CPU utilisation, etc. 684 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 685 APPLDATA monitor record, i.e. enables or disables monitoring this record 686 on the z/VM side. 687 688 Default is disabled. 689 This can also be compiled as a module, which will be called 690 appldata_os.o. 691 692config APPLDATA_NET_SUM 693 def_tristate m 694 prompt "Monitor overall network statistics" 695 depends on APPLDATA_BASE && NET 696 help 697 This provides network related data to the Linux - VM Monitor Stream, 698 currently there is only a total sum of network I/O statistics, no 699 per-interface data. 700 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 701 APPLDATA monitor record, i.e. enables or disables monitoring this record 702 on the z/VM side. 703 704 Default is disabled. 705 This can also be compiled as a module, which will be called 706 appldata_net_sum.o. 707 708config S390_HYPFS_FS 709 def_bool y 710 prompt "s390 hypervisor file system support" 711 select SYS_HYPERVISOR 712 help 713 This is a virtual file system intended to provide accounting 714 information in an s390 hypervisor environment. 715 716source "arch/s390/kvm/Kconfig" 717 718config S390_GUEST 719 def_bool y 720 prompt "s390 support for virtio devices (EXPERIMENTAL)" 721 depends on 64BIT && EXPERIMENTAL 722 select VIRTUALIZATION 723 select VIRTIO 724 select VIRTIO_CONSOLE 725 help 726 Enabling this option adds support for virtio based paravirtual device 727 drivers on s390. 728 729 Select this option if you want to run the kernel as a guest under 730 the KVM hypervisor. 731 732endmenu 733