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 MMU
  6. def_bool y
  7. config ZONE_DMA
  8. def_bool y
  9. depends on 64BIT
  10. config LOCKDEP_SUPPORT
  11. def_bool y
  12. config STACKTRACE_SUPPORT
  13. def_bool y
  14. config HAVE_LATENCYTOP_SUPPORT
  15. def_bool y
  16. config RWSEM_GENERIC_SPINLOCK
  17. bool
  18. config RWSEM_XCHGADD_ALGORITHM
  19. def_bool y
  20. config ARCH_HAS_ILOG2_U32
  21. bool
  22. default n
  23. config ARCH_HAS_ILOG2_U64
  24. bool
  25. default n
  26. config GENERIC_HWEIGHT
  27. def_bool y
  28. config GENERIC_TIME
  29. def_bool y
  30. config GENERIC_BUG
  31. bool
  32. depends on BUG
  33. default y
  34. config NO_IOMEM
  35. def_bool y
  36. config NO_DMA
  37. def_bool y
  38. config GENERIC_LOCKBREAK
  39. bool
  40. default y
  41. depends on SMP && PREEMPT
  42. mainmenu "Linux Kernel Configuration"
  43. config S390
  44. def_bool y
  45. select HAVE_OPROFILE
  46. select HAVE_KPROBES
  47. select HAVE_KRETPROBES
  48. source "init/Kconfig"
  49. menu "Base setup"
  50. comment "Processor type and features"
  51. config 64BIT
  52. bool "64 bit kernel"
  53. help
  54. Select this option if you have a 64 bit IBM zSeries machine
  55. and want to use the 64 bit addressing mode.
  56. config 32BIT
  57. bool
  58. default y if !64BIT
  59. config SMP
  60. bool "Symmetric multi-processing support"
  61. ---help---
  62. This enables support for systems with more than one CPU. If you have
  63. a system with only one CPU, like most personal computers, say N. If
  64. you have a system with more than one CPU, say Y.
  65. If you say N here, the kernel will run on single and multiprocessor
  66. machines, but will use only one CPU of a multiprocessor machine. If
  67. you say Y here, the kernel will run on many, but not all,
  68. singleprocessor machines. On a singleprocessor machine, the kernel
  69. will run faster if you say N here.
  70. See also the SMP-HOWTO available at
  71. <http://www.tldp.org/docs.html#howto>.
  72. Even if you don't know what to do here, say Y.
  73. config NR_CPUS
  74. int "Maximum number of CPUs (2-64)"
  75. range 2 64
  76. depends on SMP
  77. default "32" if !64BIT
  78. default "64" if 64BIT
  79. help
  80. This allows you to specify the maximum number of CPUs which this
  81. kernel will support. The maximum supported value is 64 and the
  82. minimum value which makes sense is 2.
  83. This is purely to save memory - each supported CPU adds
  84. approximately sixteen kilobytes to the kernel image.
  85. config HOTPLUG_CPU
  86. bool "Support for hot-pluggable CPUs"
  87. depends on SMP
  88. select HOTPLUG
  89. default n
  90. help
  91. Say Y here to be able to turn CPUs off and on. CPUs
  92. can be controlled through /sys/devices/system/cpu/cpu#.
  93. Say N if you want to disable CPU hotplug.
  94. config MATHEMU
  95. bool "IEEE FPU emulation"
  96. depends on MARCH_G5
  97. help
  98. This option is required for IEEE compliant floating point arithmetic
  99. on older S/390 machines. Say Y unless you know your machine doesn't
  100. need this.
  101. config COMPAT
  102. bool "Kernel support for 31 bit emulation"
  103. depends on 64BIT
  104. help
  105. Select this option if you want to enable your system kernel to
  106. handle system-calls from ELF binaries for 31 bit ESA. This option
  107. (and some other stuff like libraries and such) is needed for
  108. executing 31 bit applications. It is safe to say "Y".
  109. config SYSVIPC_COMPAT
  110. bool
  111. depends on COMPAT && SYSVIPC
  112. default y
  113. config AUDIT_ARCH
  114. bool
  115. default y
  116. config S390_SWITCH_AMODE
  117. bool "Switch kernel/user addressing modes"
  118. help
  119. This option allows to switch the addressing modes of kernel and user
  120. space. The kernel parameter switch_amode=on will enable this feature,
  121. default is disabled. Enabling this (via kernel parameter) on machines
  122. earlier than IBM System z9-109 EC/BC will reduce system performance.
  123. Note that this option will also be selected by selecting the execute
  124. protection option below. Enabling the execute protection via the
  125. noexec kernel parameter will also switch the addressing modes,
  126. independent of the switch_amode kernel parameter.
  127. config S390_EXEC_PROTECT
  128. bool "Data execute protection"
  129. select S390_SWITCH_AMODE
  130. help
  131. This option allows to enable a buffer overflow protection for user
  132. space programs and it also selects the addressing mode option above.
  133. The kernel parameter noexec=on will enable this feature and also
  134. switch the addressing modes, default is disabled. Enabling this (via
  135. kernel parameter) on machines earlier than IBM System z9-109 EC/BC
  136. will reduce system performance.
  137. comment "Code generation options"
  138. choice
  139. prompt "Processor type"
  140. default MARCH_G5
  141. config MARCH_G5
  142. bool "S/390 model G5 and G6"
  143. depends on !64BIT
  144. help
  145. Select this to build a 31 bit kernel that works
  146. on all S/390 and zSeries machines.
  147. config MARCH_Z900
  148. bool "IBM eServer zSeries model z800 and z900"
  149. help
  150. Select this to optimize for zSeries machines. This
  151. will enable some optimizations that are not available
  152. on older 31 bit only CPUs.
  153. config MARCH_Z990
  154. bool "IBM eServer zSeries model z890 and z990"
  155. help
  156. Select this enable optimizations for model z890/z990.
  157. This will be slightly faster but does not work on
  158. older machines such as the z900.
  159. config MARCH_Z9_109
  160. bool "IBM System z9"
  161. help
  162. Select this to enable optimizations for IBM System z9-109, IBM
  163. System z9 Enterprise Class (z9 EC), and IBM System z9 Business
  164. Class (z9 BC). The kernel will be slightly faster but will not
  165. work on older machines such as the z990, z890, z900, and z800.
  166. endchoice
  167. config PACK_STACK
  168. bool "Pack kernel stack"
  169. help
  170. This option enables the compiler option -mkernel-backchain if it
  171. is available. If the option is available the compiler supports
  172. the new stack layout which dramatically reduces the minimum stack
  173. frame size. With an old compiler a non-leaf function needs a
  174. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  175. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  176. and 24 byte on 64 bit.
  177. Say Y if you are unsure.
  178. config SMALL_STACK
  179. bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
  180. depends on PACK_STACK && !LOCKDEP
  181. help
  182. If you say Y here and the compiler supports the -mkernel-backchain
  183. option the kernel will use a smaller kernel stack size. For 31 bit
  184. the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
  185. instead of 16kb. This allows to run more thread on a system and
  186. reduces the pressure on the memory management for higher order
  187. page allocations.
  188. Say N if you are unsure.
  189. config CHECK_STACK
  190. bool "Detect kernel stack overflow"
  191. help
  192. This option enables the compiler option -mstack-guard and
  193. -mstack-size if they are available. If the compiler supports them
  194. it will emit additional code to each function prolog to trigger
  195. an illegal operation if the kernel stack is about to overflow.
  196. Say N if you are unsure.
  197. config STACK_GUARD
  198. int "Size of the guard area (128-1024)"
  199. range 128 1024
  200. depends on CHECK_STACK
  201. default "256"
  202. help
  203. This allows you to specify the size of the guard area at the lower
  204. end of the kernel stack. If the kernel stack points into the guard
  205. area on function entry an illegal operation is triggered. The size
  206. needs to be a power of 2. Please keep in mind that the size of an
  207. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  208. The minimum size for the stack guard should be 256 for 31 bit and
  209. 512 for 64 bit.
  210. config WARN_STACK
  211. bool "Emit compiler warnings for function with broken stack usage"
  212. help
  213. This option enables the compiler options -mwarn-framesize and
  214. -mwarn-dynamicstack. If the compiler supports these options it
  215. will generate warnings for function which either use alloca or
  216. create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
  217. Say N if you are unsure.
  218. config WARN_STACK_SIZE
  219. int "Maximum frame size considered safe (128-2048)"
  220. range 128 2048
  221. depends on WARN_STACK
  222. default "256"
  223. help
  224. This allows you to specify the maximum frame size a function may
  225. have without the compiler complaining about it.
  226. config ARCH_POPULATES_NODE_MAP
  227. def_bool y
  228. comment "Kernel preemption"
  229. source "kernel/Kconfig.preempt"
  230. source "mm/Kconfig"
  231. comment "I/O subsystem configuration"
  232. config MACHCHK_WARNING
  233. bool "Process warning machine checks"
  234. help
  235. Select this option if you want the machine check handler on IBM S/390 or
  236. zSeries to process warning machine checks (e.g. on power failures).
  237. If unsure, say "Y".
  238. config QDIO
  239. tristate "QDIO support"
  240. ---help---
  241. This driver provides the Queued Direct I/O base support for
  242. IBM mainframes.
  243. For details please refer to the documentation provided by IBM at
  244. <http://www10.software.ibm.com/developerworks/opensource/linux390>
  245. To compile this driver as a module, choose M here: the
  246. module will be called qdio.
  247. If unsure, say Y.
  248. config QDIO_DEBUG
  249. bool "Extended debugging information"
  250. depends on QDIO
  251. help
  252. Say Y here to get extended debugging output in
  253. /sys/kernel/debug/s390dbf/qdio...
  254. Warning: this option reduces the performance of the QDIO module.
  255. If unsure, say N.
  256. comment "Misc"
  257. config IPL
  258. bool "Builtin IPL record support"
  259. help
  260. If you want to use the produced kernel to IPL directly from a
  261. device, you have to merge a bootsector specific to the device
  262. into the first bytes of the kernel. You will have to select the
  263. IPL device.
  264. choice
  265. prompt "IPL method generated into head.S"
  266. depends on IPL
  267. default IPL_TAPE
  268. help
  269. Select "tape" if you want to IPL the image from a Tape.
  270. Select "vm_reader" if you are running under VM/ESA and want
  271. to IPL the image from the emulated card reader.
  272. config IPL_TAPE
  273. bool "tape"
  274. config IPL_VM
  275. bool "vm_reader"
  276. endchoice
  277. source "fs/Kconfig.binfmt"
  278. config PROCESS_DEBUG
  279. bool "Show crashed user process info"
  280. help
  281. Say Y to print all process fault locations to the console. This is
  282. a debugging option; you probably do not want to set it unless you
  283. are an S390 port maintainer.
  284. config PFAULT
  285. bool "Pseudo page fault support"
  286. help
  287. Select this option, if you want to use PFAULT pseudo page fault
  288. handling under VM. If running native or in LPAR, this option
  289. has no effect. If your VM does not support PFAULT, PAGEEX
  290. pseudo page fault handling will be used.
  291. Note that VM 4.2 supports PFAULT but has a bug in its
  292. implementation that causes some problems.
  293. Everybody who wants to run Linux under VM != VM4.2 should select
  294. this option.
  295. config SHARED_KERNEL
  296. bool "VM shared kernel support"
  297. help
  298. Select this option, if you want to share the text segment of the
  299. Linux kernel between different VM guests. This reduces memory
  300. usage with lots of guests but greatly increases kernel size.
  301. Also if a kernel was IPL'ed from a shared segment the kexec system
  302. call will not work.
  303. You should only select this option if you know what you are
  304. doing and want to exploit this feature.
  305. config CMM
  306. tristate "Cooperative memory management"
  307. help
  308. Select this option, if you want to enable the kernel interface
  309. to reduce the memory size of the system. This is accomplished
  310. by allocating pages of memory and put them "on hold". This only
  311. makes sense for a system running under VM where the unused pages
  312. will be reused by VM for other guest systems. The interface
  313. allows an external monitor to balance memory of many systems.
  314. Everybody who wants to run Linux under VM should select this
  315. option.
  316. config CMM_PROC
  317. bool "/proc interface to cooperative memory management"
  318. depends on CMM
  319. help
  320. Select this option to enable the /proc interface to the
  321. cooperative memory management.
  322. config CMM_IUCV
  323. bool "IUCV special message interface to cooperative memory management"
  324. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  325. help
  326. Select this option to enable the special message interface to
  327. the cooperative memory management.
  328. config VIRT_TIMER
  329. bool "Virtual CPU timer support"
  330. help
  331. This provides a kernel interface for virtual CPU timers.
  332. Default is disabled.
  333. config VIRT_CPU_ACCOUNTING
  334. bool "Base user process accounting on virtual cpu timer"
  335. depends on VIRT_TIMER
  336. help
  337. Select this option to use CPU timer deltas to do user
  338. process accounting.
  339. config APPLDATA_BASE
  340. bool "Linux - VM Monitor Stream, base infrastructure"
  341. depends on PROC_FS && VIRT_TIMER=y
  342. help
  343. This provides a kernel interface for creating and updating z/VM APPLDATA
  344. monitor records. The monitor records are updated at certain time
  345. intervals, once the timer is started.
  346. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  347. i.e. enables or disables monitoring on the Linux side.
  348. A custom interval value (in seconds) can be written to
  349. /proc/appldata/interval.
  350. Defaults are 60 seconds interval and timer off.
  351. The /proc entries can also be read from, showing the current settings.
  352. config APPLDATA_MEM
  353. tristate "Monitor memory management statistics"
  354. depends on APPLDATA_BASE && VM_EVENT_COUNTERS
  355. help
  356. This provides memory management related data to the Linux - VM Monitor
  357. Stream, like paging/swapping rate, memory utilisation, etc.
  358. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  359. APPLDATA monitor record, i.e. enables or disables monitoring this record
  360. on the z/VM side.
  361. Default is disabled.
  362. The /proc entry can also be read from, showing the current settings.
  363. This can also be compiled as a module, which will be called
  364. appldata_mem.o.
  365. config APPLDATA_OS
  366. tristate "Monitor OS statistics"
  367. depends on APPLDATA_BASE
  368. help
  369. This provides OS related data to the Linux - VM Monitor Stream, like
  370. CPU utilisation, etc.
  371. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  372. APPLDATA monitor record, i.e. enables or disables monitoring this record
  373. on the z/VM side.
  374. Default is disabled.
  375. This can also be compiled as a module, which will be called
  376. appldata_os.o.
  377. config APPLDATA_NET_SUM
  378. tristate "Monitor overall network statistics"
  379. depends on APPLDATA_BASE
  380. help
  381. This provides network related data to the Linux - VM Monitor Stream,
  382. currently there is only a total sum of network I/O statistics, no
  383. per-interface data.
  384. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  385. APPLDATA monitor record, i.e. enables or disables monitoring this record
  386. on the z/VM side.
  387. Default is disabled.
  388. This can also be compiled as a module, which will be called
  389. appldata_net_sum.o.
  390. source kernel/Kconfig.hz
  391. config NO_IDLE_HZ
  392. bool "No HZ timer ticks in idle"
  393. help
  394. Switches the regular HZ timer off when the system is going idle.
  395. This helps z/VM to detect that the Linux system is idle. VM can
  396. then "swap-out" this guest which reduces memory usage. It also
  397. reduces the overhead of idle systems.
  398. The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
  399. hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
  400. timer is active.
  401. config NO_IDLE_HZ_INIT
  402. bool "HZ timer in idle off by default"
  403. depends on NO_IDLE_HZ
  404. help
  405. The HZ timer is switched off in idle by default. That means the
  406. HZ timer is already disabled at boot time.
  407. config S390_HYPFS_FS
  408. bool "s390 hypervisor file system support"
  409. select SYS_HYPERVISOR
  410. default y
  411. help
  412. This is a virtual file system intended to provide accounting
  413. information in an s390 hypervisor environment.
  414. config KEXEC
  415. bool "kexec system call"
  416. help
  417. kexec is a system call that implements the ability to shutdown your
  418. current kernel, and to start another kernel. It is like a reboot
  419. but is independent of hardware/microcode support.
  420. config ZFCPDUMP
  421. tristate "zfcpdump support"
  422. select SMP
  423. default n
  424. help
  425. Select this option if you want to build an zfcpdump enabled kernel.
  426. Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
  427. endmenu
  428. source "net/Kconfig"
  429. config PCMCIA
  430. def_bool n
  431. config CCW
  432. def_bool y
  433. source "drivers/Kconfig"
  434. source "fs/Kconfig"
  435. source "arch/s390/Kconfig.debug"
  436. source "security/Kconfig"
  437. source "crypto/Kconfig"
  438. source "lib/Kconfig"