Kconfig 18 KB

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  1. config MMU
  2. def_bool y
  3. config ZONE_DMA
  4. def_bool y if 64BIT
  5. config LOCKDEP_SUPPORT
  6. def_bool y
  7. config STACKTRACE_SUPPORT
  8. def_bool y
  9. config HAVE_LATENCYTOP_SUPPORT
  10. def_bool y
  11. config RWSEM_GENERIC_SPINLOCK
  12. bool
  13. config RWSEM_XCHGADD_ALGORITHM
  14. def_bool y
  15. config ARCH_HAS_ILOG2_U32
  16. def_bool n
  17. config ARCH_HAS_ILOG2_U64
  18. def_bool n
  19. config GENERIC_HWEIGHT
  20. def_bool y
  21. config GENERIC_TIME_VSYSCALL
  22. def_bool y
  23. config GENERIC_CLOCKEVENTS
  24. def_bool y
  25. config GENERIC_BUG
  26. def_bool y if BUG
  27. config GENERIC_BUG_RELATIVE_POINTERS
  28. def_bool y
  29. config NO_IOMEM
  30. def_bool y
  31. config NO_DMA
  32. def_bool y
  33. config ARCH_DMA_ADDR_T_64BIT
  34. def_bool 64BIT
  35. config GENERIC_LOCKBREAK
  36. def_bool y if SMP && PREEMPT
  37. config PGSTE
  38. def_bool y if KVM
  39. config VIRT_CPU_ACCOUNTING
  40. def_bool y
  41. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  42. def_bool y
  43. config S390
  44. def_bool y
  45. select USE_GENERIC_SMP_HELPERS if SMP
  46. select HAVE_SYSCALL_WRAPPERS
  47. select HAVE_FUNCTION_TRACER
  48. select HAVE_FUNCTION_TRACE_MCOUNT_TEST
  49. select HAVE_FTRACE_MCOUNT_RECORD
  50. select HAVE_C_RECORDMCOUNT
  51. select HAVE_SYSCALL_TRACEPOINTS
  52. select HAVE_DYNAMIC_FTRACE
  53. select HAVE_FUNCTION_GRAPH_TRACER
  54. select HAVE_REGS_AND_STACK_ACCESS_API
  55. select HAVE_OPROFILE
  56. select HAVE_KPROBES
  57. select HAVE_KRETPROBES
  58. select HAVE_KVM if 64BIT
  59. select HAVE_ARCH_TRACEHOOK
  60. select INIT_ALL_POSSIBLE
  61. select HAVE_IRQ_WORK
  62. select HAVE_PERF_EVENTS
  63. select HAVE_KERNEL_GZIP
  64. select HAVE_KERNEL_BZIP2
  65. select HAVE_KERNEL_LZMA
  66. select HAVE_KERNEL_LZO
  67. select HAVE_GET_USER_PAGES_FAST
  68. select HAVE_ARCH_MUTEX_CPU_RELAX
  69. select ARCH_INLINE_SPIN_TRYLOCK
  70. select ARCH_INLINE_SPIN_TRYLOCK_BH
  71. select ARCH_INLINE_SPIN_LOCK
  72. select ARCH_INLINE_SPIN_LOCK_BH
  73. select ARCH_INLINE_SPIN_LOCK_IRQ
  74. select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  75. select ARCH_INLINE_SPIN_UNLOCK
  76. select ARCH_INLINE_SPIN_UNLOCK_BH
  77. select ARCH_INLINE_SPIN_UNLOCK_IRQ
  78. select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  79. select ARCH_INLINE_READ_TRYLOCK
  80. select ARCH_INLINE_READ_LOCK
  81. select ARCH_INLINE_READ_LOCK_BH
  82. select ARCH_INLINE_READ_LOCK_IRQ
  83. select ARCH_INLINE_READ_LOCK_IRQSAVE
  84. select ARCH_INLINE_READ_UNLOCK
  85. select ARCH_INLINE_READ_UNLOCK_BH
  86. select ARCH_INLINE_READ_UNLOCK_IRQ
  87. select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  88. select ARCH_INLINE_WRITE_TRYLOCK
  89. select ARCH_INLINE_WRITE_LOCK
  90. select ARCH_INLINE_WRITE_LOCK_BH
  91. select ARCH_INLINE_WRITE_LOCK_IRQ
  92. select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  93. select ARCH_INLINE_WRITE_UNLOCK
  94. select ARCH_INLINE_WRITE_UNLOCK_BH
  95. select ARCH_INLINE_WRITE_UNLOCK_IRQ
  96. select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
  97. config SCHED_OMIT_FRAME_POINTER
  98. def_bool y
  99. source "init/Kconfig"
  100. source "kernel/Kconfig.freezer"
  101. menu "Base setup"
  102. comment "Processor type and features"
  103. source "kernel/time/Kconfig"
  104. config 64BIT
  105. def_bool y
  106. prompt "64 bit kernel"
  107. help
  108. Select this option if you have an IBM z/Architecture machine
  109. and want to use the 64 bit addressing mode.
  110. config 32BIT
  111. def_bool y if !64BIT
  112. config KTIME_SCALAR
  113. def_bool 32BIT
  114. config SMP
  115. def_bool y
  116. prompt "Symmetric multi-processing support"
  117. ---help---
  118. This enables support for systems with more than one CPU. If you have
  119. a system with only one CPU, like most personal computers, say N. If
  120. you have a system with more than one CPU, say Y.
  121. If you say N here, the kernel will run on single and multiprocessor
  122. machines, but will use only one CPU of a multiprocessor machine. If
  123. you say Y here, the kernel will run on many, but not all,
  124. singleprocessor machines. On a singleprocessor machine, the kernel
  125. will run faster if you say N here.
  126. See also the SMP-HOWTO available at
  127. <http://www.tldp.org/docs.html#howto>.
  128. Even if you don't know what to do here, say Y.
  129. config NR_CPUS
  130. int "Maximum number of CPUs (2-64)"
  131. range 2 64
  132. depends on SMP
  133. default "32" if !64BIT
  134. default "64" if 64BIT
  135. help
  136. This allows you to specify the maximum number of CPUs which this
  137. kernel will support. The maximum supported value is 64 and the
  138. minimum value which makes sense is 2.
  139. This is purely to save memory - each supported CPU adds
  140. approximately sixteen kilobytes to the kernel image.
  141. config HOTPLUG_CPU
  142. def_bool y
  143. prompt "Support for hot-pluggable CPUs"
  144. depends on SMP
  145. select HOTPLUG
  146. help
  147. Say Y here to be able to turn CPUs off and on. CPUs
  148. can be controlled through /sys/devices/system/cpu/cpu#.
  149. Say N if you want to disable CPU hotplug.
  150. config SCHED_MC
  151. def_bool y
  152. prompt "Multi-core scheduler support"
  153. depends on SMP
  154. help
  155. Multi-core scheduler support improves the CPU scheduler's decision
  156. making when dealing with multi-core CPU chips at a cost of slightly
  157. increased overhead in some places.
  158. config SCHED_BOOK
  159. def_bool y
  160. prompt "Book scheduler support"
  161. depends on SMP && SCHED_MC
  162. help
  163. Book scheduler support improves the CPU scheduler's decision making
  164. when dealing with machines that have several books.
  165. config MATHEMU
  166. def_bool y
  167. prompt "IEEE FPU emulation"
  168. depends on MARCH_G5
  169. help
  170. This option is required for IEEE compliant floating point arithmetic
  171. on older ESA/390 machines. Say Y unless you know your machine doesn't
  172. need this.
  173. config COMPAT
  174. def_bool y
  175. prompt "Kernel support for 31 bit emulation"
  176. depends on 64BIT
  177. select COMPAT_BINFMT_ELF
  178. help
  179. Select this option if you want to enable your system kernel to
  180. handle system-calls from ELF binaries for 31 bit ESA. This option
  181. (and some other stuff like libraries and such) is needed for
  182. executing 31 bit applications. It is safe to say "Y".
  183. config SYSVIPC_COMPAT
  184. def_bool y if COMPAT && SYSVIPC
  185. config AUDIT_ARCH
  186. def_bool y
  187. config S390_EXEC_PROTECT
  188. def_bool y
  189. prompt "Data execute protection"
  190. help
  191. This option allows to enable a buffer overflow protection for user
  192. space programs and it also selects the addressing mode option above.
  193. The kernel parameter noexec=on will enable this feature and also
  194. switch the addressing modes, default is disabled. Enabling this (via
  195. kernel parameter) on machines earlier than IBM System z9 this will
  196. reduce system performance.
  197. comment "Code generation options"
  198. choice
  199. prompt "Processor type"
  200. default MARCH_G5
  201. config MARCH_G5
  202. bool "System/390 model G5 and G6"
  203. depends on !64BIT
  204. help
  205. Select this to build a 31 bit kernel that works
  206. on all ESA/390 and z/Architecture machines.
  207. config MARCH_Z900
  208. bool "IBM zSeries model z800 and z900"
  209. help
  210. Select this to enable optimizations for model z800/z900 (2064 and
  211. 2066 series). This will enable some optimizations that are not
  212. available on older ESA/390 (31 Bit) only CPUs.
  213. config MARCH_Z990
  214. bool "IBM zSeries model z890 and z990"
  215. help
  216. Select this to enable optimizations for model z890/z990 (2084 and
  217. 2086 series). The kernel will be slightly faster but will not work
  218. on older machines.
  219. config MARCH_Z9_109
  220. bool "IBM System z9"
  221. help
  222. Select this to enable optimizations for IBM System z9 (2094 and
  223. 2096 series). The kernel will be slightly faster but will not work
  224. on older machines.
  225. config MARCH_Z10
  226. bool "IBM System z10"
  227. help
  228. Select this to enable optimizations for IBM System z10 (2097 and
  229. 2098 series). The kernel will be slightly faster but will not work
  230. on older machines.
  231. config MARCH_Z196
  232. bool "IBM zEnterprise 196"
  233. help
  234. Select this to enable optimizations for IBM zEnterprise 196
  235. (2817 series). The kernel will be slightly faster but will not work
  236. on older machines.
  237. endchoice
  238. config PACK_STACK
  239. def_bool y
  240. prompt "Pack kernel stack"
  241. help
  242. This option enables the compiler option -mkernel-backchain if it
  243. is available. If the option is available the compiler supports
  244. the new stack layout which dramatically reduces the minimum stack
  245. frame size. With an old compiler a non-leaf function needs a
  246. minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
  247. -mkernel-backchain the minimum size drops to 16 byte on 31 bit
  248. and 24 byte on 64 bit.
  249. Say Y if you are unsure.
  250. config SMALL_STACK
  251. def_bool n
  252. prompt "Use 8kb for kernel stack instead of 16kb"
  253. depends on PACK_STACK && 64BIT && !LOCKDEP
  254. help
  255. If you say Y here and the compiler supports the -mkernel-backchain
  256. option the kernel will use a smaller kernel stack size. The reduced
  257. size is 8kb instead of 16kb. This allows to run more threads on a
  258. system and reduces the pressure on the memory management for higher
  259. order page allocations.
  260. Say N if you are unsure.
  261. config CHECK_STACK
  262. def_bool y
  263. prompt "Detect kernel stack overflow"
  264. help
  265. This option enables the compiler option -mstack-guard and
  266. -mstack-size if they are available. If the compiler supports them
  267. it will emit additional code to each function prolog to trigger
  268. an illegal operation if the kernel stack is about to overflow.
  269. Say N if you are unsure.
  270. config STACK_GUARD
  271. int "Size of the guard area (128-1024)"
  272. range 128 1024
  273. depends on CHECK_STACK
  274. default "256"
  275. help
  276. This allows you to specify the size of the guard area at the lower
  277. end of the kernel stack. If the kernel stack points into the guard
  278. area on function entry an illegal operation is triggered. The size
  279. needs to be a power of 2. Please keep in mind that the size of an
  280. interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
  281. The minimum size for the stack guard should be 256 for 31 bit and
  282. 512 for 64 bit.
  283. config WARN_DYNAMIC_STACK
  284. def_bool n
  285. prompt "Emit compiler warnings for function with dynamic stack usage"
  286. help
  287. This option enables the compiler option -mwarn-dynamicstack. If the
  288. compiler supports this options generates warnings for functions
  289. that dynamically allocate stack space using alloca.
  290. Say N if you are unsure.
  291. config ARCH_POPULATES_NODE_MAP
  292. def_bool y
  293. comment "Kernel preemption"
  294. source "kernel/Kconfig.preempt"
  295. config ARCH_SPARSEMEM_ENABLE
  296. def_bool y
  297. select SPARSEMEM_VMEMMAP_ENABLE
  298. select SPARSEMEM_VMEMMAP
  299. select SPARSEMEM_STATIC if !64BIT
  300. config ARCH_SPARSEMEM_DEFAULT
  301. def_bool y
  302. config ARCH_SELECT_MEMORY_MODEL
  303. def_bool y
  304. config ARCH_ENABLE_MEMORY_HOTPLUG
  305. def_bool y if SPARSEMEM
  306. config ARCH_ENABLE_MEMORY_HOTREMOVE
  307. def_bool y
  308. config ARCH_HIBERNATION_POSSIBLE
  309. def_bool y if 64BIT
  310. source "mm/Kconfig"
  311. comment "I/O subsystem configuration"
  312. config QDIO
  313. def_tristate y
  314. prompt "QDIO support"
  315. ---help---
  316. This driver provides the Queued Direct I/O base support for
  317. IBM System z.
  318. To compile this driver as a module, choose M here: the
  319. module will be called qdio.
  320. If unsure, say Y.
  321. config CHSC_SCH
  322. def_tristate m
  323. prompt "Support for CHSC subchannels"
  324. help
  325. This driver allows usage of CHSC subchannels. A CHSC subchannel
  326. is usually present on LPAR only.
  327. The driver creates a device /dev/chsc, which may be used to
  328. obtain I/O configuration information about the machine and
  329. to issue asynchronous chsc commands (DANGEROUS).
  330. You will usually only want to use this interface on a special
  331. LPAR designated for system management.
  332. To compile this driver as a module, choose M here: the
  333. module will be called chsc_sch.
  334. If unsure, say N.
  335. comment "Misc"
  336. config IPL
  337. def_bool y
  338. prompt "Builtin IPL record support"
  339. help
  340. If you want to use the produced kernel to IPL directly from a
  341. device, you have to merge a bootsector specific to the device
  342. into the first bytes of the kernel. You will have to select the
  343. IPL device.
  344. choice
  345. prompt "IPL method generated into head.S"
  346. depends on IPL
  347. default IPL_VM
  348. help
  349. Select "tape" if you want to IPL the image from a Tape.
  350. Select "vm_reader" if you are running under VM/ESA and want
  351. to IPL the image from the emulated card reader.
  352. config IPL_TAPE
  353. bool "tape"
  354. config IPL_VM
  355. bool "vm_reader"
  356. endchoice
  357. source "fs/Kconfig.binfmt"
  358. config FORCE_MAX_ZONEORDER
  359. int
  360. default "9"
  361. config PFAULT
  362. def_bool y
  363. prompt "Pseudo page fault support"
  364. help
  365. Select this option, if you want to use PFAULT pseudo page fault
  366. handling under VM. If running native or in LPAR, this option
  367. has no effect. If your VM does not support PFAULT, PAGEEX
  368. pseudo page fault handling will be used.
  369. Note that VM 4.2 supports PFAULT but has a bug in its
  370. implementation that causes some problems.
  371. Everybody who wants to run Linux under VM != VM4.2 should select
  372. this option.
  373. config SHARED_KERNEL
  374. def_bool y
  375. prompt "VM shared kernel support"
  376. help
  377. Select this option, if you want to share the text segment of the
  378. Linux kernel between different VM guests. This reduces memory
  379. usage with lots of guests but greatly increases kernel size.
  380. Also if a kernel was IPL'ed from a shared segment the kexec system
  381. call will not work.
  382. You should only select this option if you know what you are
  383. doing and want to exploit this feature.
  384. config CMM
  385. def_tristate n
  386. prompt "Cooperative memory management"
  387. help
  388. Select this option, if you want to enable the kernel interface
  389. to reduce the memory size of the system. This is accomplished
  390. by allocating pages of memory and put them "on hold". This only
  391. makes sense for a system running under VM where the unused pages
  392. will be reused by VM for other guest systems. The interface
  393. allows an external monitor to balance memory of many systems.
  394. Everybody who wants to run Linux under VM should select this
  395. option.
  396. config CMM_IUCV
  397. def_bool y
  398. prompt "IUCV special message interface to cooperative memory management"
  399. depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
  400. help
  401. Select this option to enable the special message interface to
  402. the cooperative memory management.
  403. config APPLDATA_BASE
  404. def_bool n
  405. prompt "Linux - VM Monitor Stream, base infrastructure"
  406. depends on PROC_FS
  407. help
  408. This provides a kernel interface for creating and updating z/VM APPLDATA
  409. monitor records. The monitor records are updated at certain time
  410. intervals, once the timer is started.
  411. Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
  412. i.e. enables or disables monitoring on the Linux side.
  413. A custom interval value (in seconds) can be written to
  414. /proc/appldata/interval.
  415. Defaults are 60 seconds interval and timer off.
  416. The /proc entries can also be read from, showing the current settings.
  417. config APPLDATA_MEM
  418. def_tristate m
  419. prompt "Monitor memory management statistics"
  420. depends on APPLDATA_BASE && VM_EVENT_COUNTERS
  421. help
  422. This provides memory management related data to the Linux - VM Monitor
  423. Stream, like paging/swapping rate, memory utilisation, etc.
  424. Writing 1 or 0 to /proc/appldata/memory 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. The /proc entry can also be read from, showing the current settings.
  429. This can also be compiled as a module, which will be called
  430. appldata_mem.o.
  431. config APPLDATA_OS
  432. def_tristate m
  433. prompt "Monitor OS statistics"
  434. depends on APPLDATA_BASE
  435. help
  436. This provides OS related data to the Linux - VM Monitor Stream, like
  437. CPU utilisation, etc.
  438. Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
  439. APPLDATA monitor record, i.e. enables or disables monitoring this record
  440. on the z/VM side.
  441. Default is disabled.
  442. This can also be compiled as a module, which will be called
  443. appldata_os.o.
  444. config APPLDATA_NET_SUM
  445. def_tristate m
  446. prompt "Monitor overall network statistics"
  447. depends on APPLDATA_BASE && NET
  448. help
  449. This provides network related data to the Linux - VM Monitor Stream,
  450. currently there is only a total sum of network I/O statistics, no
  451. per-interface data.
  452. Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
  453. APPLDATA monitor record, i.e. enables or disables monitoring this record
  454. on the z/VM side.
  455. Default is disabled.
  456. This can also be compiled as a module, which will be called
  457. appldata_net_sum.o.
  458. source kernel/Kconfig.hz
  459. config S390_HYPFS_FS
  460. def_bool y
  461. prompt "s390 hypervisor file system support"
  462. select SYS_HYPERVISOR
  463. help
  464. This is a virtual file system intended to provide accounting
  465. information in an s390 hypervisor environment.
  466. config KEXEC
  467. def_bool n
  468. prompt "kexec system call"
  469. help
  470. kexec is a system call that implements the ability to shutdown your
  471. current kernel, and to start another kernel. It is like a reboot
  472. but is independent of hardware/microcode support.
  473. config ZFCPDUMP
  474. def_bool n
  475. prompt "zfcpdump support"
  476. select SMP
  477. help
  478. Select this option if you want to build an zfcpdump enabled kernel.
  479. Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
  480. config S390_GUEST
  481. def_bool y
  482. prompt "s390 guest support for KVM (EXPERIMENTAL)"
  483. depends on 64BIT && EXPERIMENTAL
  484. select VIRTIO
  485. select VIRTIO_RING
  486. select VIRTIO_CONSOLE
  487. help
  488. Select this option if you want to run the kernel as a guest under
  489. the KVM hypervisor. This will add detection for KVM as well as a
  490. virtio transport. If KVM is detected, the virtio console will be
  491. the default console.
  492. config SECCOMP
  493. def_bool y
  494. prompt "Enable seccomp to safely compute untrusted bytecode"
  495. depends on PROC_FS
  496. help
  497. This kernel feature is useful for number crunching applications
  498. that may need to compute untrusted bytecode during their
  499. execution. By using pipes or other transports made available to
  500. the process as file descriptors supporting the read/write
  501. syscalls, it's possible to isolate those applications in
  502. their own address space using seccomp. Once seccomp is
  503. enabled via /proc/<pid>/seccomp, it cannot be disabled
  504. and the task is only allowed to execute a few safe syscalls
  505. defined by each seccomp mode.
  506. If unsure, say Y.
  507. endmenu
  508. menu "Power Management"
  509. source "kernel/power/Kconfig"
  510. endmenu
  511. source "net/Kconfig"
  512. config PCMCIA
  513. def_bool n
  514. config CCW
  515. def_bool y
  516. source "drivers/Kconfig"
  517. source "fs/Kconfig"
  518. source "arch/s390/Kconfig.debug"
  519. source "security/Kconfig"
  520. source "crypto/Kconfig"
  521. source "lib/Kconfig"
  522. source "arch/s390/kvm/Kconfig"