Kconfig 15 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 MMU
  6. bool
  7. default y
  8. config LOCKDEP_SUPPORT
  9. bool
  10. default y
  11. config STACKTRACE_SUPPORT
  12. bool
  13. default y
  14. config RWSEM_GENERIC_SPINLOCK
  15. bool
  16. config RWSEM_XCHGADD_ALGORITHM
  17. bool
  18. default y
  19. config GENERIC_HWEIGHT
  20. bool
  21. default y
  22. config GENERIC_CALIBRATE_DELAY
  23. bool
  24. default y
  25. config GENERIC_BUST_SPINLOCK
  26. bool
  27. mainmenu "Linux Kernel Configuration"
  28. config S390
  29. bool
  30. default y
  31. source "init/Kconfig"
  32. menu "Base setup"
  33. comment "Processor type and features"
  34. config 64BIT
  35. bool "64 bit kernel"
  36. help
  37. Select this option if you have a 64 bit IBM zSeries machine
  38. and want to use the 64 bit addressing mode.
  39. config 32BIT
  40. bool
  41. default y if !64BIT
  42. config SMP
  43. bool "Symmetric multi-processing support"
  44. ---help---
  45. This enables support for systems with more than one CPU. If you have
  46. a system with only one CPU, like most personal computers, say N. If
  47. you have a system with more than one CPU, say Y.
  48. If you say N here, the kernel will run on single and multiprocessor
  49. machines, but will use only one CPU of a multiprocessor machine. If
  50. you say Y here, the kernel will run on many, but not all,
  51. singleprocessor machines. On a singleprocessor machine, the kernel
  52. will run faster if you say N here.
  53. See also the <file:Documentation/smp.txt> and the SMP-HOWTO
  54. available at <http://www.tldp.org/docs.html#howto>.
  55. Even if you don't know what to do here, say Y.
  56. config NR_CPUS
  57. int "Maximum number of CPUs (2-64)"
  58. range 2 64
  59. depends on SMP
  60. default "32"
  61. help
  62. This allows you to specify the maximum number of CPUs which this
  63. kernel will support. The maximum supported value is 64 and the
  64. minimum value which makes sense is 2.
  65. This is purely to save memory - each supported CPU adds
  66. approximately sixteen kilobytes to the kernel image.
  67. config HOTPLUG_CPU
  68. bool "Support for hot-pluggable CPUs"
  69. depends on SMP
  70. select HOTPLUG
  71. default n
  72. help
  73. Say Y here to be able to turn CPUs off and on. CPUs
  74. can be controlled through /sys/devices/system/cpu/cpu#.
  75. Say N if you want to disable CPU hotplug.
  76. config DEFAULT_MIGRATION_COST
  77. int
  78. default "1000000"
  79. config MATHEMU
  80. bool "IEEE FPU emulation"
  81. depends on MARCH_G5
  82. help
  83. This option is required for IEEE compliant floating point arithmetic
  84. on older S/390 machines. Say Y unless you know your machine doesn't
  85. need this.
  86. config COMPAT
  87. bool "Kernel support for 31 bit emulation"
  88. depends on 64BIT
  89. help
  90. Select this option if you want to enable your system kernel to
  91. handle system-calls from ELF binaries for 31 bit ESA. This option
  92. (and some other stuff like libraries and such) is needed for
  93. executing 31 bit applications. It is safe to say "Y".
  94. config SYSVIPC_COMPAT
  95. bool
  96. depends on COMPAT && SYSVIPC
  97. default y
  98. config AUDIT_ARCH
  99. bool
  100. default y
  101. comment "Code generation options"
  102. choice
  103. prompt "Processor type"
  104. default MARCH_G5
  105. config MARCH_G5
  106. bool "S/390 model G5 and G6"
  107. depends on !64BIT
  108. help
  109. Select this to build a 31 bit kernel that works
  110. on all S/390 and zSeries machines.
  111. config MARCH_Z900
  112. bool "IBM eServer zSeries model z800 and z900"
  113. help
  114. Select this to optimize for zSeries machines. This
  115. will enable some optimizations that are not available
  116. on older 31 bit only CPUs.
  117. config MARCH_Z990
  118. bool "IBM eServer zSeries model z890 and z990"
  119. help
  120. Select this enable optimizations for model z890/z990.
  121. This will be slightly faster but does not work on
  122. older machines such as the z900.
  123. config MARCH_Z9_109
  124. bool "IBM System z9"
  125. help
  126. Select this to enable optimizations for IBM System z9-109, IBM
  127. System z9 Enterprise Class (z9 EC), and IBM System z9 Business
  128. Class (z9 BC). The kernel will be slightly faster but will not
  129. work on older machines such as the z990, z890, z900, and z800.
  130. endchoice
  131. config PACK_STACK
  132. bool "Pack kernel stack"
  133. help
  134. This option enables the compiler option -mkernel-backchain if it
  135. is available. If the option is available the compiler supports
  136. the new stack layout which dramatically reduces the minimum stack
  137. frame size. With an old compiler a non-leaf function needs a
  138. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  139. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  140. and 24 byte on 64 bit.
  141. Say Y if you are unsure.
  142. config SMALL_STACK
  143. bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
  144. depends on PACK_STACK
  145. help
  146. If you say Y here and the compiler supports the -mkernel-backchain
  147. option the kernel will use a smaller kernel stack size. For 31 bit
  148. the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
  149. instead of 16kb. This allows to run more thread on a system and
  150. reduces the pressure on the memory management for higher order
  151. page allocations.
  152. Say N if you are unsure.
  153. config CHECK_STACK
  154. bool "Detect kernel stack overflow"
  155. help
  156. This option enables the compiler option -mstack-guard and
  157. -mstack-size if they are available. If the compiler supports them
  158. it will emit additional code to each function prolog to trigger
  159. an illegal operation if the kernel stack is about to overflow.
  160. Say N if you are unsure.
  161. config STACK_GUARD
  162. int "Size of the guard area (128-1024)"
  163. range 128 1024
  164. depends on CHECK_STACK
  165. default "256"
  166. help
  167. This allows you to specify the size of the guard area at the lower
  168. end of the kernel stack. If the kernel stack points into the guard
  169. area on function entry an illegal operation is triggered. The size
  170. needs to be a power of 2. Please keep in mind that the size of an
  171. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  172. The minimum size for the stack guard should be 256 for 31 bit and
  173. 512 for 64 bit.
  174. config WARN_STACK
  175. bool "Emit compiler warnings for function with broken stack usage"
  176. help
  177. This option enables the compiler options -mwarn-framesize and
  178. -mwarn-dynamicstack. If the compiler supports these options it
  179. will generate warnings for function which either use alloca or
  180. create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
  181. Say N if you are unsure.
  182. config WARN_STACK_SIZE
  183. int "Maximum frame size considered safe (128-2048)"
  184. range 128 2048
  185. depends on WARN_STACK
  186. default "256"
  187. help
  188. This allows you to specify the maximum frame size a function may
  189. have without the compiler complaining about it.
  190. config ARCH_POPULATES_NODE_MAP
  191. def_bool y
  192. source "mm/Kconfig"
  193. comment "I/O subsystem configuration"
  194. config MACHCHK_WARNING
  195. bool "Process warning machine checks"
  196. help
  197. Select this option if you want the machine check handler on IBM S/390 or
  198. zSeries to process warning machine checks (e.g. on power failures).
  199. If unsure, say "Y".
  200. config QDIO
  201. tristate "QDIO support"
  202. ---help---
  203. This driver provides the Queued Direct I/O base support for
  204. IBM mainframes.
  205. For details please refer to the documentation provided by IBM at
  206. <http://www10.software.ibm.com/developerworks/opensource/linux390>
  207. To compile this driver as a module, choose M here: the
  208. module will be called qdio.
  209. If unsure, say Y.
  210. config QDIO_PERF_STATS
  211. bool "Performance statistics in /proc"
  212. depends on QDIO
  213. help
  214. Say Y here to get performance statistics in /proc/qdio_perf
  215. If unsure, say N.
  216. config QDIO_DEBUG
  217. bool "Extended debugging information"
  218. depends on QDIO
  219. help
  220. Say Y here to get extended debugging output in
  221. /sys/kernel/debug/s390dbf/qdio...
  222. Warning: this option reduces the performance of the QDIO module.
  223. If unsure, say N.
  224. comment "Misc"
  225. config PREEMPT
  226. bool "Preemptible Kernel"
  227. help
  228. This option reduces the latency of the kernel when reacting to
  229. real-time or interactive events by allowing a low priority process to
  230. be preempted even if it is in kernel mode executing a system call.
  231. This allows applications to run more reliably even when the system is
  232. under load.
  233. Say N if you are unsure.
  234. config IPL
  235. bool "Builtin IPL record support"
  236. help
  237. If you want to use the produced kernel to IPL directly from a
  238. device, you have to merge a bootsector specific to the device
  239. into the first bytes of the kernel. You will have to select the
  240. IPL device.
  241. choice
  242. prompt "IPL method generated into head.S"
  243. depends on IPL
  244. default IPL_TAPE
  245. help
  246. Select "tape" if you want to IPL the image from a Tape.
  247. Select "vm_reader" if you are running under VM/ESA and want
  248. to IPL the image from the emulated card reader.
  249. config IPL_TAPE
  250. bool "tape"
  251. config IPL_VM
  252. bool "vm_reader"
  253. endchoice
  254. source "fs/Kconfig.binfmt"
  255. config PROCESS_DEBUG
  256. bool "Show crashed user process info"
  257. help
  258. Say Y to print all process fault locations to the console. This is
  259. a debugging option; you probably do not want to set it unless you
  260. are an S390 port maintainer.
  261. config PFAULT
  262. bool "Pseudo page fault support"
  263. help
  264. Select this option, if you want to use PFAULT pseudo page fault
  265. handling under VM. If running native or in LPAR, this option
  266. has no effect. If your VM does not support PFAULT, PAGEEX
  267. pseudo page fault handling will be used.
  268. Note that VM 4.2 supports PFAULT but has a bug in its
  269. implementation that causes some problems.
  270. Everybody who wants to run Linux under VM != VM4.2 should select
  271. this option.
  272. config SHARED_KERNEL
  273. bool "VM shared kernel support"
  274. help
  275. Select this option, if you want to share the text segment of the
  276. Linux kernel between different VM guests. This reduces memory
  277. usage with lots of guests but greatly increases kernel size.
  278. You should only select this option if you know what you are
  279. doing and want to exploit this feature.
  280. config CMM
  281. tristate "Cooperative memory management"
  282. help
  283. Select this option, if you want to enable the kernel interface
  284. to reduce the memory size of the system. This is accomplished
  285. by allocating pages of memory and put them "on hold". This only
  286. makes sense for a system running under VM where the unused pages
  287. will be reused by VM for other guest systems. The interface
  288. allows an external monitor to balance memory of many systems.
  289. Everybody who wants to run Linux under VM should select this
  290. option.
  291. config CMM_PROC
  292. bool "/proc interface to cooperative memory management"
  293. depends on CMM
  294. help
  295. Select this option to enable the /proc interface to the
  296. cooperative memory management.
  297. config CMM_IUCV
  298. bool "IUCV special message interface to cooperative memory management"
  299. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  300. help
  301. Select this option to enable the special message interface to
  302. the cooperative memory management.
  303. config VIRT_TIMER
  304. bool "Virtual CPU timer support"
  305. help
  306. This provides a kernel interface for virtual CPU timers.
  307. Default is disabled.
  308. config VIRT_CPU_ACCOUNTING
  309. bool "Base user process accounting on virtual cpu timer"
  310. depends on VIRT_TIMER
  311. help
  312. Select this option to use CPU timer deltas to do user
  313. process accounting.
  314. config APPLDATA_BASE
  315. bool "Linux - VM Monitor Stream, base infrastructure"
  316. depends on PROC_FS && VIRT_TIMER=y
  317. help
  318. This provides a kernel interface for creating and updating z/VM APPLDATA
  319. monitor records. The monitor records are updated at certain time
  320. intervals, once the timer is started.
  321. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  322. i.e. enables or disables monitoring on the Linux side.
  323. A custom interval value (in seconds) can be written to
  324. /proc/appldata/interval.
  325. Defaults are 60 seconds interval and timer off.
  326. The /proc entries can also be read from, showing the current settings.
  327. config APPLDATA_MEM
  328. tristate "Monitor memory management statistics"
  329. depends on APPLDATA_BASE
  330. help
  331. This provides memory management related data to the Linux - VM Monitor
  332. Stream, like paging/swapping rate, memory utilisation, etc.
  333. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  334. APPLDATA monitor record, i.e. enables or disables monitoring this record
  335. on the z/VM side.
  336. Default is disabled.
  337. The /proc entry can also be read from, showing the current settings.
  338. This can also be compiled as a module, which will be called
  339. appldata_mem.o.
  340. config APPLDATA_OS
  341. tristate "Monitor OS statistics"
  342. depends on APPLDATA_BASE
  343. help
  344. This provides OS related data to the Linux - VM Monitor Stream, like
  345. CPU utilisation, etc.
  346. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  347. APPLDATA monitor record, i.e. enables or disables monitoring this record
  348. on the z/VM side.
  349. Default is disabled.
  350. This can also be compiled as a module, which will be called
  351. appldata_os.o.
  352. config APPLDATA_NET_SUM
  353. tristate "Monitor overall network statistics"
  354. depends on APPLDATA_BASE
  355. help
  356. This provides network related data to the Linux - VM Monitor Stream,
  357. currently there is only a total sum of network I/O statistics, no
  358. per-interface data.
  359. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  360. APPLDATA monitor record, i.e. enables or disables monitoring this record
  361. on the z/VM side.
  362. Default is disabled.
  363. This can also be compiled as a module, which will be called
  364. appldata_net_sum.o.
  365. config NO_IDLE_HZ
  366. bool "No HZ timer ticks in idle"
  367. help
  368. Switches the regular HZ timer off when the system is going idle.
  369. This helps z/VM to detect that the Linux system is idle. VM can
  370. then "swap-out" this guest which reduces memory usage. It also
  371. reduces the overhead of idle systems.
  372. The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
  373. hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
  374. timer is active.
  375. config NO_IDLE_HZ_INIT
  376. bool "HZ timer in idle off by default"
  377. depends on NO_IDLE_HZ
  378. help
  379. The HZ timer is switched off in idle by default. That means the
  380. HZ timer is already disabled at boot time.
  381. config S390_HYPFS_FS
  382. bool "s390 hypervisor file system support"
  383. select SYS_HYPERVISOR
  384. default y
  385. help
  386. This is a virtual file system intended to provide accounting
  387. information in an s390 hypervisor environment.
  388. config KEXEC
  389. bool "kexec system call"
  390. help
  391. kexec is a system call that implements the ability to shutdown your
  392. current kernel, and to start another kernel. It is like a reboot
  393. but is independent of hardware/microcode support.
  394. endmenu
  395. source "net/Kconfig"
  396. config PCMCIA
  397. bool
  398. default n
  399. source "drivers/base/Kconfig"
  400. source "drivers/connector/Kconfig"
  401. source "drivers/scsi/Kconfig"
  402. source "drivers/s390/Kconfig"
  403. source "drivers/net/Kconfig"
  404. source "fs/Kconfig"
  405. menu "Instrumentation Support"
  406. source "arch/s390/oprofile/Kconfig"
  407. config KPROBES
  408. bool "Kprobes (EXPERIMENTAL)"
  409. depends on EXPERIMENTAL && MODULES
  410. help
  411. Kprobes allows you to trap at almost any kernel address and
  412. execute a callback function. register_kprobe() establishes
  413. a probepoint and specifies the callback. Kprobes is useful
  414. for kernel debugging, non-intrusive instrumentation and testing.
  415. If in doubt, say "N".
  416. endmenu
  417. source "arch/s390/Kconfig.debug"
  418. source "security/Kconfig"
  419. source "crypto/Kconfig"
  420. source "lib/Kconfig"