Kconfig 17 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. mainmenu "Linux Kernel Configuration"
  53. config S390
  54. def_bool y
  55. select HAVE_OPROFILE
  56. select HAVE_KPROBES
  57. select HAVE_KRETPROBES
  58. select HAVE_KVM if 64BIT
  59. select HAVE_ARCH_TRACEHOOK
  60. source "init/Kconfig"
  61. source "kernel/Kconfig.freezer"
  62. menu "Base setup"
  63. comment "Processor type and features"
  64. source "kernel/time/Kconfig"
  65. config 64BIT
  66. bool "64 bit kernel"
  67. help
  68. Select this option if you have a 64 bit IBM zSeries machine
  69. and want to use the 64 bit addressing mode.
  70. config 32BIT
  71. bool
  72. default y if !64BIT
  73. config SMP
  74. bool "Symmetric multi-processing support"
  75. ---help---
  76. This enables support for systems with more than one CPU. If you have
  77. a system with only one CPU, like most personal computers, say N. If
  78. you have a system with more than one CPU, say Y.
  79. If you say N here, the kernel will run on single and multiprocessor
  80. machines, but will use only one CPU of a multiprocessor machine. If
  81. you say Y here, the kernel will run on many, but not all,
  82. singleprocessor machines. On a singleprocessor machine, the kernel
  83. will run faster if you say N here.
  84. See also the SMP-HOWTO available at
  85. <http://www.tldp.org/docs.html#howto>.
  86. Even if you don't know what to do here, say Y.
  87. config NR_CPUS
  88. int "Maximum number of CPUs (2-64)"
  89. range 2 64
  90. depends on SMP
  91. default "32" if !64BIT
  92. default "64" if 64BIT
  93. help
  94. This allows you to specify the maximum number of CPUs which this
  95. kernel will support. The maximum supported value is 64 and the
  96. minimum value which makes sense is 2.
  97. This is purely to save memory - each supported CPU adds
  98. approximately sixteen kilobytes to the kernel image.
  99. config HOTPLUG_CPU
  100. bool "Support for hot-pluggable CPUs"
  101. depends on SMP
  102. select HOTPLUG
  103. default n
  104. help
  105. Say Y here to be able to turn CPUs off and on. CPUs
  106. can be controlled through /sys/devices/system/cpu/cpu#.
  107. Say N if you want to disable CPU hotplug.
  108. config MATHEMU
  109. bool "IEEE FPU emulation"
  110. depends on MARCH_G5
  111. help
  112. This option is required for IEEE compliant floating point arithmetic
  113. on older S/390 machines. Say Y unless you know your machine doesn't
  114. need this.
  115. config COMPAT
  116. bool "Kernel support for 31 bit emulation"
  117. depends on 64BIT
  118. select COMPAT_BINFMT_ELF
  119. help
  120. Select this option if you want to enable your system kernel to
  121. handle system-calls from ELF binaries for 31 bit ESA. This option
  122. (and some other stuff like libraries and such) is needed for
  123. executing 31 bit applications. It is safe to say "Y".
  124. config SYSVIPC_COMPAT
  125. bool
  126. depends on COMPAT && SYSVIPC
  127. default y
  128. config AUDIT_ARCH
  129. bool
  130. default y
  131. config S390_SWITCH_AMODE
  132. bool "Switch kernel/user addressing modes"
  133. help
  134. This option allows to switch the addressing modes of kernel and user
  135. space. The kernel parameter switch_amode=on will enable this feature,
  136. default is disabled. Enabling this (via kernel parameter) on machines
  137. earlier than IBM System z9-109 EC/BC will reduce system performance.
  138. Note that this option will also be selected by selecting the execute
  139. protection option below. Enabling the execute protection via the
  140. noexec kernel parameter will also switch the addressing modes,
  141. independent of the switch_amode kernel parameter.
  142. config S390_EXEC_PROTECT
  143. bool "Data execute protection"
  144. select S390_SWITCH_AMODE
  145. help
  146. This option allows to enable a buffer overflow protection for user
  147. space programs and it also selects the addressing mode option above.
  148. The kernel parameter noexec=on will enable this feature and also
  149. switch the addressing modes, default is disabled. Enabling this (via
  150. kernel parameter) on machines earlier than IBM System z9-109 EC/BC
  151. will reduce system performance.
  152. comment "Code generation options"
  153. choice
  154. prompt "Processor type"
  155. default MARCH_G5
  156. config MARCH_G5
  157. bool "S/390 model G5 and G6"
  158. depends on !64BIT
  159. help
  160. Select this to build a 31 bit kernel that works
  161. on all S/390 and zSeries machines.
  162. config MARCH_Z900
  163. bool "IBM eServer zSeries model z800 and z900"
  164. help
  165. Select this to optimize for zSeries machines. This
  166. will enable some optimizations that are not available
  167. on older 31 bit only CPUs.
  168. config MARCH_Z990
  169. bool "IBM eServer zSeries model z890 and z990"
  170. help
  171. Select this enable optimizations for model z890/z990.
  172. This will be slightly faster but does not work on
  173. older machines such as the z900.
  174. config MARCH_Z9_109
  175. bool "IBM System z9"
  176. help
  177. Select this to enable optimizations for IBM System z9-109, IBM
  178. System z9 Enterprise Class (z9 EC), and IBM System z9 Business
  179. Class (z9 BC). The kernel will be slightly faster but will not
  180. work on older machines such as the z990, z890, z900, and z800.
  181. endchoice
  182. config PACK_STACK
  183. bool "Pack kernel stack"
  184. help
  185. This option enables the compiler option -mkernel-backchain if it
  186. is available. If the option is available the compiler supports
  187. the new stack layout which dramatically reduces the minimum stack
  188. frame size. With an old compiler a non-leaf function needs a
  189. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  190. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  191. and 24 byte on 64 bit.
  192. Say Y if you are unsure.
  193. config SMALL_STACK
  194. bool "Use 8kb for kernel stack instead of 16kb"
  195. depends on PACK_STACK && 64BIT && !LOCKDEP
  196. help
  197. If you say Y here and the compiler supports the -mkernel-backchain
  198. option the kernel will use a smaller kernel stack size. The reduced
  199. size is 8kb instead of 16kb. This allows to run more threads on a
  200. system and reduces the pressure on the memory management for higher
  201. order page allocations.
  202. Say N if you are unsure.
  203. config CHECK_STACK
  204. bool "Detect kernel stack overflow"
  205. help
  206. This option enables the compiler option -mstack-guard and
  207. -mstack-size if they are available. If the compiler supports them
  208. it will emit additional code to each function prolog to trigger
  209. an illegal operation if the kernel stack is about to overflow.
  210. Say N if you are unsure.
  211. config STACK_GUARD
  212. int "Size of the guard area (128-1024)"
  213. range 128 1024
  214. depends on CHECK_STACK
  215. default "256"
  216. help
  217. This allows you to specify the size of the guard area at the lower
  218. end of the kernel stack. If the kernel stack points into the guard
  219. area on function entry an illegal operation is triggered. The size
  220. needs to be a power of 2. Please keep in mind that the size of an
  221. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  222. The minimum size for the stack guard should be 256 for 31 bit and
  223. 512 for 64 bit.
  224. config WARN_STACK
  225. bool "Emit compiler warnings for function with broken stack usage"
  226. help
  227. This option enables the compiler options -mwarn-framesize and
  228. -mwarn-dynamicstack. If the compiler supports these options it
  229. will generate warnings for function which either use alloca or
  230. create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
  231. Say N if you are unsure.
  232. config WARN_STACK_SIZE
  233. int "Maximum frame size considered safe (128-2048)"
  234. range 128 2048
  235. depends on WARN_STACK
  236. default "2048"
  237. help
  238. This allows you to specify the maximum frame size a function may
  239. have without the compiler complaining about it.
  240. config ARCH_POPULATES_NODE_MAP
  241. def_bool y
  242. comment "Kernel preemption"
  243. source "kernel/Kconfig.preempt"
  244. config ARCH_SPARSEMEM_ENABLE
  245. def_bool y
  246. select SPARSEMEM_VMEMMAP_ENABLE
  247. select SPARSEMEM_VMEMMAP
  248. select SPARSEMEM_STATIC if !64BIT
  249. config ARCH_SPARSEMEM_DEFAULT
  250. def_bool y
  251. config ARCH_SELECT_MEMORY_MODEL
  252. def_bool y
  253. config ARCH_ENABLE_MEMORY_HOTPLUG
  254. def_bool y
  255. depends on SPARSEMEM
  256. config ARCH_ENABLE_MEMORY_HOTREMOVE
  257. def_bool y
  258. source "mm/Kconfig"
  259. comment "I/O subsystem configuration"
  260. config MACHCHK_WARNING
  261. bool "Process warning machine checks"
  262. help
  263. Select this option if you want the machine check handler on IBM S/390 or
  264. zSeries to process warning machine checks (e.g. on power failures).
  265. If unsure, say "Y".
  266. config QDIO
  267. tristate "QDIO support"
  268. ---help---
  269. This driver provides the Queued Direct I/O base support for
  270. IBM System z.
  271. To compile this driver as a module, choose M here: the
  272. module will be called qdio.
  273. If unsure, say Y.
  274. config QDIO_DEBUG
  275. bool "Extended debugging information"
  276. depends on QDIO
  277. help
  278. Say Y here to get extended debugging output in
  279. /sys/kernel/debug/s390dbf/qdio...
  280. Warning: this option reduces the performance of the QDIO module.
  281. If unsure, say N.
  282. config CHSC_SCH
  283. tristate "Support for CHSC subchannels"
  284. help
  285. This driver allows usage of CHSC subchannels. A CHSC subchannel
  286. is usually present on LPAR only.
  287. The driver creates a device /dev/chsc, which may be used to
  288. obtain I/O configuration information about the machine and
  289. to issue asynchronous chsc commands (DANGEROUS).
  290. You will usually only want to use this interface on a special
  291. LPAR designated for system management.
  292. To compile this driver as a module, choose M here: the
  293. module will be called chsc_sch.
  294. If unsure, say N.
  295. comment "Misc"
  296. config IPL
  297. bool "Builtin IPL record support"
  298. help
  299. If you want to use the produced kernel to IPL directly from a
  300. device, you have to merge a bootsector specific to the device
  301. into the first bytes of the kernel. You will have to select the
  302. IPL device.
  303. choice
  304. prompt "IPL method generated into head.S"
  305. depends on IPL
  306. default IPL_VM
  307. help
  308. Select "tape" if you want to IPL the image from a Tape.
  309. Select "vm_reader" if you are running under VM/ESA and want
  310. to IPL the image from the emulated card reader.
  311. config IPL_TAPE
  312. bool "tape"
  313. config IPL_VM
  314. bool "vm_reader"
  315. endchoice
  316. source "fs/Kconfig.binfmt"
  317. config FORCE_MAX_ZONEORDER
  318. int
  319. default "9"
  320. config PROCESS_DEBUG
  321. bool "Show crashed user process info"
  322. help
  323. Say Y to print all process fault locations to the console. This is
  324. a debugging option; you probably do not want to set it unless you
  325. are an S390 port maintainer.
  326. config PFAULT
  327. bool "Pseudo page fault support"
  328. help
  329. Select this option, if you want to use PFAULT pseudo page fault
  330. handling under VM. If running native or in LPAR, this option
  331. has no effect. If your VM does not support PFAULT, PAGEEX
  332. pseudo page fault handling will be used.
  333. Note that VM 4.2 supports PFAULT but has a bug in its
  334. implementation that causes some problems.
  335. Everybody who wants to run Linux under VM != VM4.2 should select
  336. this option.
  337. config SHARED_KERNEL
  338. bool "VM shared kernel support"
  339. help
  340. Select this option, if you want to share the text segment of the
  341. Linux kernel between different VM guests. This reduces memory
  342. usage with lots of guests but greatly increases kernel size.
  343. Also if a kernel was IPL'ed from a shared segment the kexec system
  344. call will not work.
  345. You should only select this option if you know what you are
  346. doing and want to exploit this feature.
  347. config CMM
  348. tristate "Cooperative memory management"
  349. help
  350. Select this option, if you want to enable the kernel interface
  351. to reduce the memory size of the system. This is accomplished
  352. by allocating pages of memory and put them "on hold". This only
  353. makes sense for a system running under VM where the unused pages
  354. will be reused by VM for other guest systems. The interface
  355. allows an external monitor to balance memory of many systems.
  356. Everybody who wants to run Linux under VM should select this
  357. option.
  358. config CMM_PROC
  359. bool "/proc interface to cooperative memory management"
  360. depends on CMM
  361. help
  362. Select this option to enable the /proc interface to the
  363. cooperative memory management.
  364. config CMM_IUCV
  365. bool "IUCV special message interface to cooperative memory management"
  366. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  367. help
  368. Select this option to enable the special message interface to
  369. the cooperative memory management.
  370. config PAGE_STATES
  371. bool "Unused page notification"
  372. help
  373. This enables the notification of unused pages to the
  374. hypervisor. The ESSA instruction is used to do the states
  375. changes between a page that has content and the unused state.
  376. config VIRT_TIMER
  377. bool "Virtual CPU timer support"
  378. help
  379. This provides a kernel interface for virtual CPU timers.
  380. Default is disabled.
  381. config VIRT_CPU_ACCOUNTING
  382. bool "Base user process accounting on virtual cpu timer"
  383. depends on VIRT_TIMER
  384. help
  385. Select this option to use CPU timer deltas to do user
  386. process accounting.
  387. config APPLDATA_BASE
  388. bool "Linux - VM Monitor Stream, base infrastructure"
  389. depends on PROC_FS && VIRT_TIMER=y
  390. help
  391. This provides a kernel interface for creating and updating z/VM APPLDATA
  392. monitor records. The monitor records are updated at certain time
  393. intervals, once the timer is started.
  394. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  395. i.e. enables or disables monitoring on the Linux side.
  396. A custom interval value (in seconds) can be written to
  397. /proc/appldata/interval.
  398. Defaults are 60 seconds interval and timer off.
  399. The /proc entries can also be read from, showing the current settings.
  400. config APPLDATA_MEM
  401. tristate "Monitor memory management statistics"
  402. depends on APPLDATA_BASE && VM_EVENT_COUNTERS
  403. help
  404. This provides memory management related data to the Linux - VM Monitor
  405. Stream, like paging/swapping rate, memory utilisation, etc.
  406. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  407. APPLDATA monitor record, i.e. enables or disables monitoring this record
  408. on the z/VM side.
  409. Default is disabled.
  410. The /proc entry can also be read from, showing the current settings.
  411. This can also be compiled as a module, which will be called
  412. appldata_mem.o.
  413. config APPLDATA_OS
  414. tristate "Monitor OS statistics"
  415. depends on APPLDATA_BASE
  416. help
  417. This provides OS related data to the Linux - VM Monitor Stream, like
  418. CPU utilisation, etc.
  419. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  420. APPLDATA monitor record, i.e. enables or disables monitoring this record
  421. on the z/VM side.
  422. Default is disabled.
  423. This can also be compiled as a module, which will be called
  424. appldata_os.o.
  425. config APPLDATA_NET_SUM
  426. tristate "Monitor overall network statistics"
  427. depends on APPLDATA_BASE
  428. help
  429. This provides network related data to the Linux - VM Monitor Stream,
  430. currently there is only a total sum of network I/O statistics, no
  431. per-interface data.
  432. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  433. APPLDATA monitor record, i.e. enables or disables monitoring this record
  434. on the z/VM side.
  435. Default is disabled.
  436. This can also be compiled as a module, which will be called
  437. appldata_net_sum.o.
  438. source kernel/Kconfig.hz
  439. config S390_HYPFS_FS
  440. bool "s390 hypervisor file system support"
  441. select SYS_HYPERVISOR
  442. default y
  443. help
  444. This is a virtual file system intended to provide accounting
  445. information in an s390 hypervisor environment.
  446. config KEXEC
  447. bool "kexec system call"
  448. help
  449. kexec is a system call that implements the ability to shutdown your
  450. current kernel, and to start another kernel. It is like a reboot
  451. but is independent of hardware/microcode support.
  452. config ZFCPDUMP
  453. tristate "zfcpdump support"
  454. select SMP
  455. default n
  456. help
  457. Select this option if you want to build an zfcpdump enabled kernel.
  458. Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
  459. config S390_GUEST
  460. bool "s390 guest support for KVM (EXPERIMENTAL)"
  461. depends on 64BIT && EXPERIMENTAL
  462. select VIRTIO
  463. select VIRTIO_RING
  464. select VIRTIO_CONSOLE
  465. help
  466. Select this option if you want to run the kernel as a guest under
  467. the KVM hypervisor. This will add detection for KVM as well as a
  468. virtio transport. If KVM is detected, the virtio console will be
  469. the default console.
  470. endmenu
  471. source "net/Kconfig"
  472. config PCMCIA
  473. def_bool n
  474. config CCW
  475. def_bool y
  476. source "drivers/Kconfig"
  477. source "fs/Kconfig"
  478. source "arch/s390/Kconfig.debug"
  479. source "security/Kconfig"
  480. source "crypto/Kconfig"
  481. source "lib/Kconfig"
  482. source "arch/s390/kvm/Kconfig"