Kconfig 16 KB

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  1. #
  2. # For a description of the syntax of this configuration file,
  3. # see Documentation/kbuild/kconfig-language.txt.
  4. #
  5. config SCHED_MC
  6. def_bool y
  7. depends on SMP
  8. config MMU
  9. def_bool y
  10. config ZONE_DMA
  11. def_bool y
  12. depends on 64BIT
  13. config LOCKDEP_SUPPORT
  14. def_bool y
  15. config STACKTRACE_SUPPORT
  16. def_bool y
  17. config HAVE_LATENCYTOP_SUPPORT
  18. def_bool y
  19. config RWSEM_GENERIC_SPINLOCK
  20. bool
  21. config RWSEM_XCHGADD_ALGORITHM
  22. def_bool y
  23. config ARCH_HAS_ILOG2_U32
  24. bool
  25. default n
  26. config ARCH_HAS_ILOG2_U64
  27. bool
  28. default n
  29. config GENERIC_HWEIGHT
  30. def_bool y
  31. config GENERIC_TIME
  32. def_bool y
  33. config GENERIC_TIME_VSYSCALL
  34. def_bool y
  35. config GENERIC_CLOCKEVENTS
  36. def_bool y
  37. config GENERIC_BUG
  38. bool
  39. depends on BUG
  40. default y
  41. config NO_IOMEM
  42. def_bool y
  43. config NO_DMA
  44. def_bool y
  45. config GENERIC_LOCKBREAK
  46. bool
  47. default y
  48. depends on SMP && PREEMPT
  49. config PGSTE
  50. bool
  51. default y if KVM
  52. config VIRT_CPU_ACCOUNTING
  53. def_bool y
  54. mainmenu "Linux Kernel Configuration"
  55. config S390
  56. def_bool y
  57. select USE_GENERIC_SMP_HELPERS if SMP
  58. select HAVE_FUNCTION_TRACER
  59. select HAVE_OPROFILE
  60. select HAVE_KPROBES
  61. select HAVE_KRETPROBES
  62. select HAVE_KVM if 64BIT
  63. select HAVE_ARCH_TRACEHOOK
  64. source "init/Kconfig"
  65. source "kernel/Kconfig.freezer"
  66. menu "Base setup"
  67. comment "Processor type and features"
  68. source "kernel/time/Kconfig"
  69. config 64BIT
  70. bool "64 bit kernel"
  71. help
  72. Select this option if you have a 64 bit IBM zSeries machine
  73. and want to use the 64 bit addressing mode.
  74. config 32BIT
  75. bool
  76. default y if !64BIT
  77. config SMP
  78. bool "Symmetric multi-processing support"
  79. ---help---
  80. This enables support for systems with more than one CPU. If you have
  81. a system with only one CPU, like most personal computers, say N. If
  82. you have a system with more than one CPU, say Y.
  83. If you say N here, the kernel will run on single and multiprocessor
  84. machines, but will use only one CPU of a multiprocessor machine. If
  85. you say Y here, the kernel will run on many, but not all,
  86. singleprocessor machines. On a singleprocessor machine, the kernel
  87. will run faster if you say N here.
  88. See also the SMP-HOWTO available at
  89. <http://www.tldp.org/docs.html#howto>.
  90. Even if you don't know what to do here, say Y.
  91. config NR_CPUS
  92. int "Maximum number of CPUs (2-64)"
  93. range 2 64
  94. depends on SMP
  95. default "32" if !64BIT
  96. default "64" if 64BIT
  97. help
  98. This allows you to specify the maximum number of CPUs which this
  99. kernel will support. The maximum supported value is 64 and the
  100. minimum value which makes sense is 2.
  101. This is purely to save memory - each supported CPU adds
  102. approximately sixteen kilobytes to the kernel image.
  103. config HOTPLUG_CPU
  104. bool "Support for hot-pluggable CPUs"
  105. depends on SMP
  106. select HOTPLUG
  107. default n
  108. help
  109. Say Y here to be able to turn CPUs off and on. CPUs
  110. can be controlled through /sys/devices/system/cpu/cpu#.
  111. Say N if you want to disable CPU hotplug.
  112. config MATHEMU
  113. bool "IEEE FPU emulation"
  114. depends on MARCH_G5
  115. help
  116. This option is required for IEEE compliant floating point arithmetic
  117. on older S/390 machines. Say Y unless you know your machine doesn't
  118. need this.
  119. config COMPAT
  120. bool "Kernel support for 31 bit emulation"
  121. depends on 64BIT
  122. select COMPAT_BINFMT_ELF
  123. help
  124. Select this option if you want to enable your system kernel to
  125. handle system-calls from ELF binaries for 31 bit ESA. This option
  126. (and some other stuff like libraries and such) is needed for
  127. executing 31 bit applications. It is safe to say "Y".
  128. config SYSVIPC_COMPAT
  129. bool
  130. depends on COMPAT && SYSVIPC
  131. default y
  132. config AUDIT_ARCH
  133. bool
  134. default y
  135. config S390_SWITCH_AMODE
  136. bool "Switch kernel/user addressing modes"
  137. help
  138. This option allows to switch the addressing modes of kernel and user
  139. space. The kernel parameter switch_amode=on will enable this feature,
  140. default is disabled. Enabling this (via kernel parameter) on machines
  141. earlier than IBM System z9-109 EC/BC will reduce system performance.
  142. Note that this option will also be selected by selecting the execute
  143. protection option below. Enabling the execute protection via the
  144. noexec kernel parameter will also switch the addressing modes,
  145. independent of the switch_amode kernel parameter.
  146. config S390_EXEC_PROTECT
  147. bool "Data execute protection"
  148. select S390_SWITCH_AMODE
  149. help
  150. This option allows to enable a buffer overflow protection for user
  151. space programs and it also selects the addressing mode option above.
  152. The kernel parameter noexec=on will enable this feature and also
  153. switch the addressing modes, default is disabled. Enabling this (via
  154. kernel parameter) on machines earlier than IBM System z9-109 EC/BC
  155. will reduce system performance.
  156. comment "Code generation options"
  157. choice
  158. prompt "Processor type"
  159. default MARCH_G5
  160. config MARCH_G5
  161. bool "S/390 model G5 and G6"
  162. depends on !64BIT
  163. help
  164. Select this to build a 31 bit kernel that works
  165. on all S/390 and zSeries machines.
  166. config MARCH_Z900
  167. bool "IBM eServer zSeries model z800 and z900"
  168. help
  169. Select this to optimize for zSeries machines. This
  170. will enable some optimizations that are not available
  171. on older 31 bit only CPUs.
  172. config MARCH_Z990
  173. bool "IBM eServer zSeries model z890 and z990"
  174. help
  175. Select this enable optimizations for model z890/z990.
  176. This will be slightly faster but does not work on
  177. older machines such as the z900.
  178. config MARCH_Z9_109
  179. bool "IBM System z9"
  180. help
  181. Select this to enable optimizations for IBM System z9-109, IBM
  182. System z9 Enterprise Class (z9 EC), and IBM System z9 Business
  183. Class (z9 BC). The kernel will be slightly faster but will not
  184. work on older machines such as the z990, z890, z900, and z800.
  185. config MARCH_Z10
  186. bool "IBM System z10"
  187. help
  188. Select this to enable optimizations for IBM System z10. The
  189. kernel will be slightly faster but will not work on older
  190. machines such as the z990, z890, z900, z800, z9-109, z9-ec
  191. and z9-bc.
  192. endchoice
  193. config PACK_STACK
  194. bool "Pack kernel stack"
  195. help
  196. This option enables the compiler option -mkernel-backchain if it
  197. is available. If the option is available the compiler supports
  198. the new stack layout which dramatically reduces the minimum stack
  199. frame size. With an old compiler a non-leaf function needs a
  200. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  201. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  202. and 24 byte on 64 bit.
  203. Say Y if you are unsure.
  204. config SMALL_STACK
  205. bool "Use 8kb for kernel stack instead of 16kb"
  206. depends on PACK_STACK && 64BIT && !LOCKDEP
  207. help
  208. If you say Y here and the compiler supports the -mkernel-backchain
  209. option the kernel will use a smaller kernel stack size. The reduced
  210. size is 8kb instead of 16kb. This allows to run more threads on a
  211. system and reduces the pressure on the memory management for higher
  212. order page allocations.
  213. Say N if you are unsure.
  214. config CHECK_STACK
  215. bool "Detect kernel stack overflow"
  216. help
  217. This option enables the compiler option -mstack-guard and
  218. -mstack-size if they are available. If the compiler supports them
  219. it will emit additional code to each function prolog to trigger
  220. an illegal operation if the kernel stack is about to overflow.
  221. Say N if you are unsure.
  222. config STACK_GUARD
  223. int "Size of the guard area (128-1024)"
  224. range 128 1024
  225. depends on CHECK_STACK
  226. default "256"
  227. help
  228. This allows you to specify the size of the guard area at the lower
  229. end of the kernel stack. If the kernel stack points into the guard
  230. area on function entry an illegal operation is triggered. The size
  231. needs to be a power of 2. Please keep in mind that the size of an
  232. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  233. The minimum size for the stack guard should be 256 for 31 bit and
  234. 512 for 64 bit.
  235. config WARN_STACK
  236. bool "Emit compiler warnings for function with broken stack usage"
  237. help
  238. This option enables the compiler options -mwarn-framesize and
  239. -mwarn-dynamicstack. If the compiler supports these options it
  240. will generate warnings for function which either use alloca or
  241. create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
  242. Say N if you are unsure.
  243. config WARN_STACK_SIZE
  244. int "Maximum frame size considered safe (128-2048)"
  245. range 128 2048
  246. depends on WARN_STACK
  247. default "2048"
  248. help
  249. This allows you to specify the maximum frame size a function may
  250. have without the compiler complaining about it.
  251. config ARCH_POPULATES_NODE_MAP
  252. def_bool y
  253. comment "Kernel preemption"
  254. source "kernel/Kconfig.preempt"
  255. config ARCH_SPARSEMEM_ENABLE
  256. def_bool y
  257. select SPARSEMEM_VMEMMAP_ENABLE
  258. select SPARSEMEM_VMEMMAP
  259. select SPARSEMEM_STATIC if !64BIT
  260. config ARCH_SPARSEMEM_DEFAULT
  261. def_bool y
  262. config ARCH_SELECT_MEMORY_MODEL
  263. def_bool y
  264. config ARCH_ENABLE_MEMORY_HOTPLUG
  265. def_bool y
  266. depends on SPARSEMEM
  267. config ARCH_ENABLE_MEMORY_HOTREMOVE
  268. def_bool y
  269. source "mm/Kconfig"
  270. comment "I/O subsystem configuration"
  271. config MACHCHK_WARNING
  272. bool "Process warning machine checks"
  273. help
  274. Select this option if you want the machine check handler on IBM S/390 or
  275. zSeries to process warning machine checks (e.g. on power failures).
  276. If unsure, say "Y".
  277. config QDIO
  278. tristate "QDIO support"
  279. ---help---
  280. This driver provides the Queued Direct I/O base support for
  281. IBM System z.
  282. To compile this driver as a module, choose M here: the
  283. module will be called qdio.
  284. If unsure, say Y.
  285. config CHSC_SCH
  286. tristate "Support for CHSC subchannels"
  287. help
  288. This driver allows usage of CHSC subchannels. A CHSC subchannel
  289. is usually present on LPAR only.
  290. The driver creates a device /dev/chsc, which may be used to
  291. obtain I/O configuration information about the machine and
  292. to issue asynchronous chsc commands (DANGEROUS).
  293. You will usually only want to use this interface on a special
  294. LPAR designated for system management.
  295. To compile this driver as a module, choose M here: the
  296. module will be called chsc_sch.
  297. If unsure, say N.
  298. comment "Misc"
  299. config IPL
  300. bool "Builtin IPL record support"
  301. help
  302. If you want to use the produced kernel to IPL directly from a
  303. device, you have to merge a bootsector specific to the device
  304. into the first bytes of the kernel. You will have to select the
  305. IPL device.
  306. choice
  307. prompt "IPL method generated into head.S"
  308. depends on IPL
  309. default IPL_VM
  310. help
  311. Select "tape" if you want to IPL the image from a Tape.
  312. Select "vm_reader" if you are running under VM/ESA and want
  313. to IPL the image from the emulated card reader.
  314. config IPL_TAPE
  315. bool "tape"
  316. config IPL_VM
  317. bool "vm_reader"
  318. endchoice
  319. source "fs/Kconfig.binfmt"
  320. config FORCE_MAX_ZONEORDER
  321. int
  322. default "9"
  323. config PROCESS_DEBUG
  324. bool "Show crashed user process info"
  325. help
  326. Say Y to print all process fault locations to the console. This is
  327. a debugging option; you probably do not want to set it unless you
  328. are an S390 port maintainer.
  329. config PFAULT
  330. bool "Pseudo page fault support"
  331. help
  332. Select this option, if you want to use PFAULT pseudo page fault
  333. handling under VM. If running native or in LPAR, this option
  334. has no effect. If your VM does not support PFAULT, PAGEEX
  335. pseudo page fault handling will be used.
  336. Note that VM 4.2 supports PFAULT but has a bug in its
  337. implementation that causes some problems.
  338. Everybody who wants to run Linux under VM != VM4.2 should select
  339. this option.
  340. config SHARED_KERNEL
  341. bool "VM shared kernel support"
  342. help
  343. Select this option, if you want to share the text segment of the
  344. Linux kernel between different VM guests. This reduces memory
  345. usage with lots of guests but greatly increases kernel size.
  346. Also if a kernel was IPL'ed from a shared segment the kexec system
  347. call will not work.
  348. You should only select this option if you know what you are
  349. doing and want to exploit this feature.
  350. config CMM
  351. tristate "Cooperative memory management"
  352. help
  353. Select this option, if you want to enable the kernel interface
  354. to reduce the memory size of the system. This is accomplished
  355. by allocating pages of memory and put them "on hold". This only
  356. makes sense for a system running under VM where the unused pages
  357. will be reused by VM for other guest systems. The interface
  358. allows an external monitor to balance memory of many systems.
  359. Everybody who wants to run Linux under VM should select this
  360. option.
  361. config CMM_PROC
  362. bool "/proc interface to cooperative memory management"
  363. depends on CMM
  364. help
  365. Select this option to enable the /proc interface to the
  366. cooperative memory management.
  367. config CMM_IUCV
  368. bool "IUCV special message interface to cooperative memory management"
  369. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  370. help
  371. Select this option to enable the special message interface to
  372. the cooperative memory management.
  373. config PAGE_STATES
  374. bool "Unused page notification"
  375. help
  376. This enables the notification of unused pages to the
  377. hypervisor. The ESSA instruction is used to do the states
  378. changes between a page that has content and the unused state.
  379. config APPLDATA_BASE
  380. bool "Linux - VM Monitor Stream, base infrastructure"
  381. depends on PROC_FS
  382. help
  383. This provides a kernel interface for creating and updating z/VM APPLDATA
  384. monitor records. The monitor records are updated at certain time
  385. intervals, once the timer is started.
  386. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  387. i.e. enables or disables monitoring on the Linux side.
  388. A custom interval value (in seconds) can be written to
  389. /proc/appldata/interval.
  390. Defaults are 60 seconds interval and timer off.
  391. The /proc entries can also be read from, showing the current settings.
  392. config APPLDATA_MEM
  393. tristate "Monitor memory management statistics"
  394. depends on APPLDATA_BASE && VM_EVENT_COUNTERS
  395. help
  396. This provides memory management related data to the Linux - VM Monitor
  397. Stream, like paging/swapping rate, memory utilisation, etc.
  398. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  399. APPLDATA monitor record, i.e. enables or disables monitoring this record
  400. on the z/VM side.
  401. Default is disabled.
  402. The /proc entry can also be read from, showing the current settings.
  403. This can also be compiled as a module, which will be called
  404. appldata_mem.o.
  405. config APPLDATA_OS
  406. tristate "Monitor OS statistics"
  407. depends on APPLDATA_BASE
  408. help
  409. This provides OS related data to the Linux - VM Monitor Stream, like
  410. CPU utilisation, etc.
  411. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  412. APPLDATA monitor record, i.e. enables or disables monitoring this record
  413. on the z/VM side.
  414. Default is disabled.
  415. This can also be compiled as a module, which will be called
  416. appldata_os.o.
  417. config APPLDATA_NET_SUM
  418. tristate "Monitor overall network statistics"
  419. depends on APPLDATA_BASE
  420. help
  421. This provides network related data to the Linux - VM Monitor Stream,
  422. currently there is only a total sum of network I/O statistics, no
  423. per-interface data.
  424. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  425. APPLDATA monitor record, i.e. enables or disables monitoring this record
  426. on the z/VM side.
  427. Default is disabled.
  428. This can also be compiled as a module, which will be called
  429. appldata_net_sum.o.
  430. source kernel/Kconfig.hz
  431. config S390_HYPFS_FS
  432. bool "s390 hypervisor file system support"
  433. select SYS_HYPERVISOR
  434. default y
  435. help
  436. This is a virtual file system intended to provide accounting
  437. information in an s390 hypervisor environment.
  438. config KEXEC
  439. bool "kexec system call"
  440. help
  441. kexec is a system call that implements the ability to shutdown your
  442. current kernel, and to start another kernel. It is like a reboot
  443. but is independent of hardware/microcode support.
  444. config ZFCPDUMP
  445. tristate "zfcpdump support"
  446. select SMP
  447. default n
  448. help
  449. Select this option if you want to build an zfcpdump enabled kernel.
  450. Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
  451. config S390_GUEST
  452. bool "s390 guest support for KVM (EXPERIMENTAL)"
  453. depends on 64BIT && EXPERIMENTAL
  454. select VIRTIO
  455. select VIRTIO_RING
  456. select VIRTIO_CONSOLE
  457. help
  458. Select this option if you want to run the kernel as a guest under
  459. the KVM hypervisor. This will add detection for KVM as well as a
  460. virtio transport. If KVM is detected, the virtio console will be
  461. the default console.
  462. endmenu
  463. source "net/Kconfig"
  464. config PCMCIA
  465. def_bool n
  466. config CCW
  467. def_bool y
  468. source "drivers/Kconfig"
  469. source "fs/Kconfig"
  470. source "arch/s390/Kconfig.debug"
  471. source "security/Kconfig"
  472. source "crypto/Kconfig"
  473. source "lib/Kconfig"
  474. source "arch/s390/kvm/Kconfig"