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. config VIRT_CPU_ACCOUNTING
  53. def_bool y
  54. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  55. def_bool y
  56. mainmenu "Linux Kernel Configuration"
  57. config S390
  58. def_bool y
  59. select USE_GENERIC_SMP_HELPERS if SMP
  60. select HAVE_SYSCALL_WRAPPERS
  61. select HAVE_FUNCTION_TRACER
  62. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  63. select HAVE_FTRACE_MCOUNT_RECORD
  64. select HAVE_FTRACE_SYSCALLS
  65. select HAVE_DYNAMIC_FTRACE
  66. select HAVE_FUNCTION_GRAPH_TRACER
  67. select HAVE_DEFAULT_NO_SPIN_MUTEXES
  68. select HAVE_OPROFILE
  69. select HAVE_KPROBES
  70. select HAVE_KRETPROBES
  71. select HAVE_KVM if 64BIT
  72. select HAVE_ARCH_TRACEHOOK
  73. select INIT_ALL_POSSIBLE
  74. select HAVE_PERF_COUNTERS
  75. select GENERIC_ATOMIC64 if !64BIT
  76. config SCHED_OMIT_FRAME_POINTER
  77. bool
  78. default y
  79. source "init/Kconfig"
  80. source "kernel/Kconfig.freezer"
  81. menu "Base setup"
  82. comment "Processor type and features"
  83. source "kernel/time/Kconfig"
  84. config 64BIT
  85. bool "64 bit kernel"
  86. help
  87. Select this option if you have a 64 bit IBM zSeries machine
  88. and want to use the 64 bit addressing mode.
  89. config 32BIT
  90. bool
  91. default y if !64BIT
  92. config SMP
  93. bool "Symmetric multi-processing support"
  94. ---help---
  95. This enables support for systems with more than one CPU. If you have
  96. a system with only one CPU, like most personal computers, say N. If
  97. you have a system with more than one CPU, say Y.
  98. If you say N here, the kernel will run on single and multiprocessor
  99. machines, but will use only one CPU of a multiprocessor machine. If
  100. you say Y here, the kernel will run on many, but not all,
  101. singleprocessor machines. On a singleprocessor machine, the kernel
  102. will run faster if you say N here.
  103. See also the SMP-HOWTO available at
  104. <http://www.tldp.org/docs.html#howto>.
  105. Even if you don't know what to do here, say Y.
  106. config NR_CPUS
  107. int "Maximum number of CPUs (2-64)"
  108. range 2 64
  109. depends on SMP
  110. default "32" if !64BIT
  111. default "64" if 64BIT
  112. help
  113. This allows you to specify the maximum number of CPUs which this
  114. kernel will support. The maximum supported value is 64 and the
  115. minimum value which makes sense is 2.
  116. This is purely to save memory - each supported CPU adds
  117. approximately sixteen kilobytes to the kernel image.
  118. config HOTPLUG_CPU
  119. bool "Support for hot-pluggable CPUs"
  120. depends on SMP
  121. select HOTPLUG
  122. default n
  123. help
  124. Say Y here to be able to turn CPUs off and on. CPUs
  125. can be controlled through /sys/devices/system/cpu/cpu#.
  126. Say N if you want to disable CPU hotplug.
  127. config MATHEMU
  128. bool "IEEE FPU emulation"
  129. depends on MARCH_G5
  130. help
  131. This option is required for IEEE compliant floating point arithmetic
  132. on older S/390 machines. Say Y unless you know your machine doesn't
  133. need this.
  134. config COMPAT
  135. bool "Kernel support for 31 bit emulation"
  136. depends on 64BIT
  137. select COMPAT_BINFMT_ELF
  138. help
  139. Select this option if you want to enable your system kernel to
  140. handle system-calls from ELF binaries for 31 bit ESA. This option
  141. (and some other stuff like libraries and such) is needed for
  142. executing 31 bit applications. It is safe to say "Y".
  143. config SYSVIPC_COMPAT
  144. bool
  145. depends on COMPAT && SYSVIPC
  146. default y
  147. config AUDIT_ARCH
  148. bool
  149. default y
  150. config S390_SWITCH_AMODE
  151. bool "Switch kernel/user addressing modes"
  152. help
  153. This option allows to switch the addressing modes of kernel and user
  154. space. The kernel parameter switch_amode=on will enable this feature,
  155. default is disabled. Enabling this (via kernel parameter) on machines
  156. earlier than IBM System z9-109 EC/BC will reduce system performance.
  157. Note that this option will also be selected by selecting the execute
  158. protection option below. Enabling the execute protection via the
  159. noexec kernel parameter will also switch the addressing modes,
  160. independent of the switch_amode kernel parameter.
  161. config S390_EXEC_PROTECT
  162. bool "Data execute protection"
  163. select S390_SWITCH_AMODE
  164. help
  165. This option allows to enable a buffer overflow protection for user
  166. space programs and it also selects the addressing mode option above.
  167. The kernel parameter noexec=on will enable this feature and also
  168. switch the addressing modes, default is disabled. Enabling this (via
  169. kernel parameter) on machines earlier than IBM System z9-109 EC/BC
  170. will reduce system performance.
  171. comment "Code generation options"
  172. choice
  173. prompt "Processor type"
  174. default MARCH_G5
  175. config MARCH_G5
  176. bool "S/390 model G5 and G6"
  177. depends on !64BIT
  178. help
  179. Select this to build a 31 bit kernel that works
  180. on all S/390 and zSeries machines.
  181. config MARCH_Z900
  182. bool "IBM eServer zSeries model z800 and z900"
  183. help
  184. Select this to optimize for zSeries machines. This
  185. will enable some optimizations that are not available
  186. on older 31 bit only CPUs.
  187. config MARCH_Z990
  188. bool "IBM eServer zSeries model z890 and z990"
  189. help
  190. Select this enable optimizations for model z890/z990.
  191. This will be slightly faster but does not work on
  192. older machines such as the z900.
  193. config MARCH_Z9_109
  194. bool "IBM System z9"
  195. help
  196. Select this to enable optimizations for IBM System z9-109, IBM
  197. System z9 Enterprise Class (z9 EC), and IBM System z9 Business
  198. Class (z9 BC). The kernel will be slightly faster but will not
  199. work on older machines such as the z990, z890, z900, and z800.
  200. config MARCH_Z10
  201. bool "IBM System z10"
  202. help
  203. Select this to enable optimizations for IBM System z10. The
  204. kernel will be slightly faster but will not work on older
  205. machines such as the z990, z890, z900, z800, z9-109, z9-ec
  206. and z9-bc.
  207. endchoice
  208. config PACK_STACK
  209. bool "Pack kernel stack"
  210. help
  211. This option enables the compiler option -mkernel-backchain if it
  212. is available. If the option is available the compiler supports
  213. the new stack layout which dramatically reduces the minimum stack
  214. frame size. With an old compiler a non-leaf function needs a
  215. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  216. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  217. and 24 byte on 64 bit.
  218. Say Y if you are unsure.
  219. config SMALL_STACK
  220. bool "Use 8kb for kernel stack instead of 16kb"
  221. depends on PACK_STACK && 64BIT && !LOCKDEP
  222. help
  223. If you say Y here and the compiler supports the -mkernel-backchain
  224. option the kernel will use a smaller kernel stack size. The reduced
  225. size is 8kb instead of 16kb. This allows to run more threads on a
  226. system and reduces the pressure on the memory management for higher
  227. order page allocations.
  228. Say N if you are unsure.
  229. config CHECK_STACK
  230. bool "Detect kernel stack overflow"
  231. help
  232. This option enables the compiler option -mstack-guard and
  233. -mstack-size if they are available. If the compiler supports them
  234. it will emit additional code to each function prolog to trigger
  235. an illegal operation if the kernel stack is about to overflow.
  236. Say N if you are unsure.
  237. config STACK_GUARD
  238. int "Size of the guard area (128-1024)"
  239. range 128 1024
  240. depends on CHECK_STACK
  241. default "256"
  242. help
  243. This allows you to specify the size of the guard area at the lower
  244. end of the kernel stack. If the kernel stack points into the guard
  245. area on function entry an illegal operation is triggered. The size
  246. needs to be a power of 2. Please keep in mind that the size of an
  247. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  248. The minimum size for the stack guard should be 256 for 31 bit and
  249. 512 for 64 bit.
  250. config WARN_STACK
  251. bool "Emit compiler warnings for function with broken stack usage"
  252. help
  253. This option enables the compiler options -mwarn-framesize and
  254. -mwarn-dynamicstack. If the compiler supports these options it
  255. will generate warnings for function which either use alloca or
  256. create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
  257. Say N if you are unsure.
  258. config WARN_STACK_SIZE
  259. int "Maximum frame size considered safe (128-2048)"
  260. range 128 2048
  261. depends on WARN_STACK
  262. default "2048"
  263. help
  264. This allows you to specify the maximum frame size a function may
  265. have without the compiler complaining about it.
  266. config ARCH_POPULATES_NODE_MAP
  267. def_bool y
  268. comment "Kernel preemption"
  269. source "kernel/Kconfig.preempt"
  270. config ARCH_SPARSEMEM_ENABLE
  271. def_bool y
  272. select SPARSEMEM_VMEMMAP_ENABLE
  273. select SPARSEMEM_VMEMMAP
  274. select SPARSEMEM_STATIC if !64BIT
  275. config ARCH_SPARSEMEM_DEFAULT
  276. def_bool y
  277. config ARCH_SELECT_MEMORY_MODEL
  278. def_bool y
  279. config ARCH_ENABLE_MEMORY_HOTPLUG
  280. def_bool y
  281. depends on SPARSEMEM
  282. config ARCH_ENABLE_MEMORY_HOTREMOVE
  283. def_bool y
  284. config ARCH_HIBERNATION_POSSIBLE
  285. def_bool y if 64BIT
  286. source "mm/Kconfig"
  287. comment "I/O subsystem configuration"
  288. config QDIO
  289. tristate "QDIO support"
  290. ---help---
  291. This driver provides the Queued Direct I/O base support for
  292. IBM System z.
  293. To compile this driver as a module, choose M here: the
  294. module will be called qdio.
  295. If unsure, say Y.
  296. config CHSC_SCH
  297. tristate "Support for CHSC subchannels"
  298. help
  299. This driver allows usage of CHSC subchannels. A CHSC subchannel
  300. is usually present on LPAR only.
  301. The driver creates a device /dev/chsc, which may be used to
  302. obtain I/O configuration information about the machine and
  303. to issue asynchronous chsc commands (DANGEROUS).
  304. You will usually only want to use this interface on a special
  305. LPAR designated for system management.
  306. To compile this driver as a module, choose M here: the
  307. module will be called chsc_sch.
  308. If unsure, say N.
  309. comment "Misc"
  310. config IPL
  311. bool "Builtin IPL record support"
  312. help
  313. If you want to use the produced kernel to IPL directly from a
  314. device, you have to merge a bootsector specific to the device
  315. into the first bytes of the kernel. You will have to select the
  316. IPL device.
  317. choice
  318. prompt "IPL method generated into head.S"
  319. depends on IPL
  320. default IPL_VM
  321. help
  322. Select "tape" if you want to IPL the image from a Tape.
  323. Select "vm_reader" if you are running under VM/ESA and want
  324. to IPL the image from the emulated card reader.
  325. config IPL_TAPE
  326. bool "tape"
  327. config IPL_VM
  328. bool "vm_reader"
  329. endchoice
  330. source "fs/Kconfig.binfmt"
  331. config FORCE_MAX_ZONEORDER
  332. int
  333. default "9"
  334. config PROCESS_DEBUG
  335. bool "Show crashed user process info"
  336. help
  337. Say Y to print all process fault locations to the console. This is
  338. a debugging option; you probably do not want to set it unless you
  339. are an S390 port maintainer.
  340. config PFAULT
  341. bool "Pseudo page fault support"
  342. help
  343. Select this option, if you want to use PFAULT pseudo page fault
  344. handling under VM. If running native or in LPAR, this option
  345. has no effect. If your VM does not support PFAULT, PAGEEX
  346. pseudo page fault handling will be used.
  347. Note that VM 4.2 supports PFAULT but has a bug in its
  348. implementation that causes some problems.
  349. Everybody who wants to run Linux under VM != VM4.2 should select
  350. this option.
  351. config SHARED_KERNEL
  352. bool "VM shared kernel support"
  353. help
  354. Select this option, if you want to share the text segment of the
  355. Linux kernel between different VM guests. This reduces memory
  356. usage with lots of guests but greatly increases kernel size.
  357. Also if a kernel was IPL'ed from a shared segment the kexec system
  358. call will not work.
  359. You should only select this option if you know what you are
  360. doing and want to exploit this feature.
  361. config CMM
  362. tristate "Cooperative memory management"
  363. help
  364. Select this option, if you want to enable the kernel interface
  365. to reduce the memory size of the system. This is accomplished
  366. by allocating pages of memory and put them "on hold". This only
  367. makes sense for a system running under VM where the unused pages
  368. will be reused by VM for other guest systems. The interface
  369. allows an external monitor to balance memory of many systems.
  370. Everybody who wants to run Linux under VM should select this
  371. option.
  372. config CMM_PROC
  373. bool "/proc interface to cooperative memory management"
  374. depends on CMM
  375. help
  376. Select this option to enable the /proc interface to the
  377. cooperative memory management.
  378. config CMM_IUCV
  379. bool "IUCV special message interface to cooperative memory management"
  380. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  381. help
  382. Select this option to enable the special message interface to
  383. the cooperative memory management.
  384. config PAGE_STATES
  385. bool "Unused page notification"
  386. help
  387. This enables the notification of unused pages to the
  388. hypervisor. The ESSA instruction is used to do the states
  389. changes between a page that has content and the unused state.
  390. config APPLDATA_BASE
  391. bool "Linux - VM Monitor Stream, base infrastructure"
  392. depends on PROC_FS
  393. help
  394. This provides a kernel interface for creating and updating z/VM APPLDATA
  395. monitor records. The monitor records are updated at certain time
  396. intervals, once the timer is started.
  397. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  398. i.e. enables or disables monitoring on the Linux side.
  399. A custom interval value (in seconds) can be written to
  400. /proc/appldata/interval.
  401. Defaults are 60 seconds interval and timer off.
  402. The /proc entries can also be read from, showing the current settings.
  403. config APPLDATA_MEM
  404. tristate "Monitor memory management statistics"
  405. depends on APPLDATA_BASE && VM_EVENT_COUNTERS
  406. help
  407. This provides memory management related data to the Linux - VM Monitor
  408. Stream, like paging/swapping rate, memory utilisation, etc.
  409. Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
  410. APPLDATA monitor record, i.e. enables or disables monitoring this record
  411. on the z/VM side.
  412. Default is disabled.
  413. The /proc entry can also be read from, showing the current settings.
  414. This can also be compiled as a module, which will be called
  415. appldata_mem.o.
  416. config APPLDATA_OS
  417. tristate "Monitor OS statistics"
  418. depends on APPLDATA_BASE
  419. help
  420. This provides OS related data to the Linux - VM Monitor Stream, like
  421. CPU utilisation, etc.
  422. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  423. APPLDATA monitor record, i.e. enables or disables monitoring this record
  424. on the z/VM side.
  425. Default is disabled.
  426. This can also be compiled as a module, which will be called
  427. appldata_os.o.
  428. config APPLDATA_NET_SUM
  429. tristate "Monitor overall network statistics"
  430. depends on APPLDATA_BASE && NET
  431. help
  432. This provides network related data to the Linux - VM Monitor Stream,
  433. currently there is only a total sum of network I/O statistics, no
  434. per-interface data.
  435. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  436. APPLDATA monitor record, i.e. enables or disables monitoring this record
  437. on the z/VM side.
  438. Default is disabled.
  439. This can also be compiled as a module, which will be called
  440. appldata_net_sum.o.
  441. source kernel/Kconfig.hz
  442. config S390_HYPFS_FS
  443. bool "s390 hypervisor file system support"
  444. select SYS_HYPERVISOR
  445. default y
  446. help
  447. This is a virtual file system intended to provide accounting
  448. information in an s390 hypervisor environment.
  449. config KEXEC
  450. bool "kexec system call"
  451. help
  452. kexec is a system call that implements the ability to shutdown your
  453. current kernel, and to start another kernel. It is like a reboot
  454. but is independent of hardware/microcode support.
  455. config ZFCPDUMP
  456. bool "zfcpdump support"
  457. select SMP
  458. default n
  459. help
  460. Select this option if you want to build an zfcpdump enabled kernel.
  461. Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
  462. config S390_GUEST
  463. bool "s390 guest support for KVM (EXPERIMENTAL)"
  464. depends on 64BIT && EXPERIMENTAL
  465. select VIRTIO
  466. select VIRTIO_RING
  467. select VIRTIO_CONSOLE
  468. help
  469. Select this option if you want to run the kernel as a guest under
  470. the KVM hypervisor. This will add detection for KVM as well as a
  471. virtio transport. If KVM is detected, the virtio console will be
  472. the default console.
  473. config SECCOMP
  474. bool "Enable seccomp to safely compute untrusted bytecode"
  475. depends on PROC_FS
  476. default y
  477. help
  478. This kernel feature is useful for number crunching applications
  479. that may need to compute untrusted bytecode during their
  480. execution. By using pipes or other transports made available to
  481. the process as file descriptors supporting the read/write
  482. syscalls, it's possible to isolate those applications in
  483. their own address space using seccomp. Once seccomp is
  484. enabled via /proc/<pid>/seccomp, it cannot be disabled
  485. and the task is only allowed to execute a few safe syscalls
  486. defined by each seccomp mode.
  487. If unsure, say Y.
  488. endmenu
  489. menu "Power Management"
  490. source "kernel/power/Kconfig"
  491. endmenu
  492. source "net/Kconfig"
  493. config PCMCIA
  494. def_bool n
  495. config CCW
  496. def_bool y
  497. source "drivers/Kconfig"
  498. source "fs/Kconfig"
  499. source "arch/s390/Kconfig.debug"
  500. source "security/Kconfig"
  501. source "crypto/Kconfig"
  502. source "lib/Kconfig"
  503. source "arch/s390/kvm/Kconfig"