Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | # |
| 2 | # For a description of the syntax of this configuration file, |
| 3 | # see Documentation/kbuild/kconfig-language.txt. |
| 4 | # |
| 5 | |
| 6 | config MMU |
| 7 | bool |
| 8 | default y |
| 9 | |
| 10 | config RWSEM_GENERIC_SPINLOCK |
| 11 | bool |
| 12 | |
| 13 | config RWSEM_XCHGADD_ALGORITHM |
| 14 | bool |
| 15 | default y |
| 16 | |
| 17 | config GENERIC_CALIBRATE_DELAY |
| 18 | bool |
| 19 | default y |
| 20 | |
| 21 | config GENERIC_BUST_SPINLOCK |
| 22 | bool |
| 23 | |
| 24 | mainmenu "Linux Kernel Configuration" |
| 25 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 26 | config S390 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | bool |
| 28 | default y |
| 29 | |
| 30 | config UID16 |
| 31 | bool |
| 32 | default y |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 33 | depends on !64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | source "init/Kconfig" |
| 36 | |
| 37 | menu "Base setup" |
| 38 | |
| 39 | comment "Processor type and features" |
| 40 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 41 | config 64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | bool "64 bit kernel" |
| 43 | help |
| 44 | Select this option if you have a 64 bit IBM zSeries machine |
| 45 | and want to use the 64 bit addressing mode. |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | config SMP |
| 48 | bool "Symmetric multi-processing support" |
| 49 | ---help--- |
| 50 | This enables support for systems with more than one CPU. If you have |
| 51 | a system with only one CPU, like most personal computers, say N. If |
| 52 | you have a system with more than one CPU, say Y. |
| 53 | |
| 54 | If you say N here, the kernel will run on single and multiprocessor |
| 55 | machines, but will use only one CPU of a multiprocessor machine. If |
| 56 | you say Y here, the kernel will run on many, but not all, |
| 57 | singleprocessor machines. On a singleprocessor machine, the kernel |
| 58 | will run faster if you say N here. |
| 59 | |
| 60 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO |
| 61 | available at <http://www.tldp.org/docs.html#howto>. |
| 62 | |
| 63 | Even if you don't know what to do here, say Y. |
| 64 | |
| 65 | config NR_CPUS |
| 66 | int "Maximum number of CPUs (2-64)" |
| 67 | range 2 64 |
| 68 | depends on SMP |
| 69 | default "32" |
| 70 | help |
| 71 | This allows you to specify the maximum number of CPUs which this |
| 72 | kernel will support. The maximum supported value is 64 and the |
| 73 | minimum value which makes sense is 2. |
| 74 | |
| 75 | This is purely to save memory - each supported CPU adds |
| 76 | approximately sixteen kilobytes to the kernel image. |
| 77 | |
| 78 | config HOTPLUG_CPU |
| 79 | bool "Support for hot-pluggable CPUs" |
| 80 | depends on SMP |
| 81 | select HOTPLUG |
| 82 | default n |
| 83 | help |
| 84 | Say Y here to be able to turn CPUs off and on. CPUs |
| 85 | can be controlled through /sys/devices/system/cpu/cpu#. |
| 86 | Say N if you want to disable CPU hotplug. |
| 87 | |
| 88 | config MATHEMU |
| 89 | bool "IEEE FPU emulation" |
| 90 | depends on MARCH_G5 |
| 91 | help |
| 92 | This option is required for IEEE compliant floating point arithmetic |
| 93 | on older S/390 machines. Say Y unless you know your machine doesn't |
| 94 | need this. |
| 95 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 96 | config COMPAT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | bool "Kernel support for 31 bit emulation" |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 98 | depends on 64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | help |
| 100 | Select this option if you want to enable your system kernel to |
| 101 | handle system-calls from ELF binaries for 31 bit ESA. This option |
| 102 | (and some other stuff like libraries and such) is needed for |
| 103 | executing 31 bit applications. It is safe to say "Y". |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | config SYSVIPC_COMPAT |
| 106 | bool |
| 107 | depends on COMPAT && SYSVIPC |
| 108 | default y |
| 109 | |
| 110 | config BINFMT_ELF32 |
| 111 | tristate "Kernel support for 31 bit ELF binaries" |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 112 | depends on COMPAT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | help |
| 114 | This allows you to run 32-bit Linux/ELF binaries on your zSeries |
| 115 | in 64 bit mode. Everybody wants this; say Y. |
| 116 | |
| 117 | comment "Code generation options" |
| 118 | |
| 119 | choice |
| 120 | prompt "Processor type" |
| 121 | default MARCH_G5 |
| 122 | |
| 123 | config MARCH_G5 |
| 124 | bool "S/390 model G5 and G6" |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame^] | 125 | depends on !64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | help |
| 127 | Select this to build a 31 bit kernel that works |
| 128 | on all S/390 and zSeries machines. |
| 129 | |
| 130 | config MARCH_Z900 |
| 131 | bool "IBM eServer zSeries model z800 and z900" |
| 132 | help |
| 133 | Select this to optimize for zSeries machines. This |
| 134 | will enable some optimizations that are not available |
| 135 | on older 31 bit only CPUs. |
| 136 | |
| 137 | config MARCH_Z990 |
| 138 | bool "IBM eServer zSeries model z890 and z990" |
| 139 | help |
| 140 | Select this enable optimizations for model z890/z990. |
| 141 | This will be slightly faster but does not work on |
| 142 | older machines such as the z900. |
| 143 | |
| 144 | endchoice |
| 145 | |
| 146 | config PACK_STACK |
| 147 | bool "Pack kernel stack" |
| 148 | help |
| 149 | This option enables the compiler option -mkernel-backchain if it |
| 150 | is available. If the option is available the compiler supports |
| 151 | the new stack layout which dramatically reduces the minimum stack |
| 152 | frame size. With an old compiler a non-leaf function needs a |
| 153 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With |
| 154 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit |
| 155 | and 24 byte on 64 bit. |
| 156 | |
| 157 | Say Y if you are unsure. |
| 158 | |
| 159 | config SMALL_STACK |
| 160 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" |
| 161 | depends on PACK_STACK |
| 162 | help |
| 163 | If you say Y here and the compiler supports the -mkernel-backchain |
| 164 | option the kernel will use a smaller kernel stack size. For 31 bit |
| 165 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb |
| 166 | instead of 16kb. This allows to run more thread on a system and |
| 167 | reduces the pressure on the memory management for higher order |
| 168 | page allocations. |
| 169 | |
| 170 | Say N if you are unsure. |
| 171 | |
| 172 | |
| 173 | config CHECK_STACK |
| 174 | bool "Detect kernel stack overflow" |
| 175 | help |
| 176 | This option enables the compiler option -mstack-guard and |
| 177 | -mstack-size if they are available. If the compiler supports them |
| 178 | it will emit additional code to each function prolog to trigger |
| 179 | an illegal operation if the kernel stack is about to overflow. |
| 180 | |
| 181 | Say N if you are unsure. |
| 182 | |
| 183 | config STACK_GUARD |
| 184 | int "Size of the guard area (128-1024)" |
| 185 | range 128 1024 |
| 186 | depends on CHECK_STACK |
| 187 | default "256" |
| 188 | help |
| 189 | This allows you to specify the size of the guard area at the lower |
| 190 | end of the kernel stack. If the kernel stack points into the guard |
| 191 | area on function entry an illegal operation is triggered. The size |
| 192 | needs to be a power of 2. Please keep in mind that the size of an |
| 193 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. |
| 194 | The minimum size for the stack guard should be 256 for 31 bit and |
| 195 | 512 for 64 bit. |
| 196 | |
| 197 | config WARN_STACK |
| 198 | bool "Emit compiler warnings for function with broken stack usage" |
| 199 | help |
| 200 | This option enables the compiler options -mwarn-framesize and |
| 201 | -mwarn-dynamicstack. If the compiler supports these options it |
| 202 | will generate warnings for function which either use alloca or |
| 203 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. |
| 204 | |
| 205 | Say N if you are unsure. |
| 206 | |
| 207 | config WARN_STACK_SIZE |
| 208 | int "Maximum frame size considered safe (128-2048)" |
| 209 | range 128 2048 |
| 210 | depends on WARN_STACK |
| 211 | default "256" |
| 212 | help |
| 213 | This allows you to specify the maximum frame size a function may |
| 214 | have without the compiler complaining about it. |
| 215 | |
Dave Hansen | 3f22ab2 | 2005-06-23 00:07:43 -0700 | [diff] [blame] | 216 | source "mm/Kconfig" |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | comment "I/O subsystem configuration" |
| 219 | |
| 220 | config MACHCHK_WARNING |
| 221 | bool "Process warning machine checks" |
| 222 | help |
| 223 | Select this option if you want the machine check handler on IBM S/390 or |
| 224 | zSeries to process warning machine checks (e.g. on power failures). |
| 225 | If unsure, say "Y". |
| 226 | |
| 227 | config QDIO |
| 228 | tristate "QDIO support" |
| 229 | ---help--- |
Frank Pavlic | 8129ee1 | 2006-01-06 00:19:20 -0800 | [diff] [blame] | 230 | This driver provides the Queued Direct I/O base support for |
| 231 | IBM mainframes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | For details please refer to the documentation provided by IBM at |
| 234 | <http://www10.software.ibm.com/developerworks/opensource/linux390> |
| 235 | |
| 236 | To compile this driver as a module, choose M here: the |
| 237 | module will be called qdio. |
| 238 | |
| 239 | If unsure, say Y. |
| 240 | |
| 241 | config QDIO_PERF_STATS |
| 242 | bool "Performance statistics in /proc" |
| 243 | depends on QDIO |
| 244 | help |
| 245 | Say Y here to get performance statistics in /proc/qdio_perf |
| 246 | |
| 247 | If unsure, say N. |
| 248 | |
| 249 | config QDIO_DEBUG |
| 250 | bool "Extended debugging information" |
| 251 | depends on QDIO |
| 252 | help |
Frank Pavlic | 8129ee1 | 2006-01-06 00:19:20 -0800 | [diff] [blame] | 253 | Say Y here to get extended debugging output in |
| 254 | /sys/kernel/debug/s390dbf/qdio... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | Warning: this option reduces the performance of the QDIO module. |
| 256 | |
| 257 | If unsure, say N. |
| 258 | |
| 259 | comment "Misc" |
| 260 | |
| 261 | config PREEMPT |
| 262 | bool "Preemptible Kernel" |
| 263 | help |
| 264 | This option reduces the latency of the kernel when reacting to |
| 265 | real-time or interactive events by allowing a low priority process to |
| 266 | be preempted even if it is in kernel mode executing a system call. |
| 267 | This allows applications to run more reliably even when the system is |
| 268 | under load. |
| 269 | |
| 270 | Say N if you are unsure. |
| 271 | |
| 272 | config IPL |
| 273 | bool "Builtin IPL record support" |
| 274 | help |
| 275 | If you want to use the produced kernel to IPL directly from a |
| 276 | device, you have to merge a bootsector specific to the device |
| 277 | into the first bytes of the kernel. You will have to select the |
| 278 | IPL device. |
| 279 | |
| 280 | choice |
| 281 | prompt "IPL method generated into head.S" |
| 282 | depends on IPL |
| 283 | default IPL_TAPE |
| 284 | help |
| 285 | Select "tape" if you want to IPL the image from a Tape. |
| 286 | |
| 287 | Select "vm_reader" if you are running under VM/ESA and want |
| 288 | to IPL the image from the emulated card reader. |
| 289 | |
| 290 | config IPL_TAPE |
| 291 | bool "tape" |
| 292 | |
| 293 | config IPL_VM |
| 294 | bool "vm_reader" |
| 295 | |
| 296 | endchoice |
| 297 | |
| 298 | source "fs/Kconfig.binfmt" |
| 299 | |
| 300 | config PROCESS_DEBUG |
| 301 | bool "Show crashed user process info" |
| 302 | help |
| 303 | Say Y to print all process fault locations to the console. This is |
| 304 | a debugging option; you probably do not want to set it unless you |
| 305 | are an S390 port maintainer. |
| 306 | |
| 307 | config PFAULT |
| 308 | bool "Pseudo page fault support" |
| 309 | help |
| 310 | Select this option, if you want to use PFAULT pseudo page fault |
| 311 | handling under VM. If running native or in LPAR, this option |
| 312 | has no effect. If your VM does not support PFAULT, PAGEEX |
| 313 | pseudo page fault handling will be used. |
| 314 | Note that VM 4.2 supports PFAULT but has a bug in its |
| 315 | implementation that causes some problems. |
| 316 | Everybody who wants to run Linux under VM != VM4.2 should select |
| 317 | this option. |
| 318 | |
| 319 | config SHARED_KERNEL |
| 320 | bool "VM shared kernel support" |
| 321 | help |
| 322 | Select this option, if you want to share the text segment of the |
| 323 | Linux kernel between different VM guests. This reduces memory |
| 324 | usage with lots of guests but greatly increases kernel size. |
| 325 | You should only select this option if you know what you are |
| 326 | doing and want to exploit this feature. |
| 327 | |
| 328 | config CMM |
| 329 | tristate "Cooperative memory management" |
| 330 | help |
| 331 | Select this option, if you want to enable the kernel interface |
| 332 | to reduce the memory size of the system. This is accomplished |
| 333 | by allocating pages of memory and put them "on hold". This only |
| 334 | makes sense for a system running under VM where the unused pages |
| 335 | will be reused by VM for other guest systems. The interface |
| 336 | allows an external monitor to balance memory of many systems. |
| 337 | Everybody who wants to run Linux under VM should select this |
| 338 | option. |
| 339 | |
| 340 | config CMM_PROC |
| 341 | bool "/proc interface to cooperative memory management" |
| 342 | depends on CMM |
| 343 | help |
| 344 | Select this option to enable the /proc interface to the |
| 345 | cooperative memory management. |
| 346 | |
| 347 | config CMM_IUCV |
| 348 | bool "IUCV special message interface to cooperative memory management" |
| 349 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) |
| 350 | help |
| 351 | Select this option to enable the special message interface to |
| 352 | the cooperative memory management. |
| 353 | |
| 354 | config VIRT_TIMER |
| 355 | bool "Virtual CPU timer support" |
| 356 | help |
| 357 | This provides a kernel interface for virtual CPU timers. |
| 358 | Default is disabled. |
| 359 | |
| 360 | config VIRT_CPU_ACCOUNTING |
| 361 | bool "Base user process accounting on virtual cpu timer" |
| 362 | depends on VIRT_TIMER |
| 363 | help |
| 364 | Select this option to use CPU timer deltas to do user |
| 365 | process accounting. |
| 366 | |
| 367 | config APPLDATA_BASE |
| 368 | bool "Linux - VM Monitor Stream, base infrastructure" |
| 369 | depends on PROC_FS && VIRT_TIMER=y |
| 370 | help |
| 371 | This provides a kernel interface for creating and updating z/VM APPLDATA |
| 372 | monitor records. The monitor records are updated at certain time |
| 373 | intervals, once the timer is started. |
| 374 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, |
| 375 | i.e. enables or disables monitoring on the Linux side. |
| 376 | A custom interval value (in seconds) can be written to |
| 377 | /proc/appldata/interval. |
| 378 | |
| 379 | Defaults are 60 seconds interval and timer off. |
| 380 | The /proc entries can also be read from, showing the current settings. |
| 381 | |
| 382 | config APPLDATA_MEM |
| 383 | tristate "Monitor memory management statistics" |
| 384 | depends on APPLDATA_BASE |
| 385 | help |
| 386 | This provides memory management related data to the Linux - VM Monitor |
| 387 | Stream, like paging/swapping rate, memory utilisation, etc. |
| 388 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM |
| 389 | APPLDATA monitor record, i.e. enables or disables monitoring this record |
| 390 | on the z/VM side. |
| 391 | |
| 392 | Default is disabled. |
| 393 | The /proc entry can also be read from, showing the current settings. |
| 394 | |
| 395 | This can also be compiled as a module, which will be called |
| 396 | appldata_mem.o. |
| 397 | |
| 398 | config APPLDATA_OS |
| 399 | tristate "Monitor OS statistics" |
| 400 | depends on APPLDATA_BASE |
| 401 | help |
| 402 | This provides OS related data to the Linux - VM Monitor Stream, like |
| 403 | CPU utilisation, etc. |
| 404 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM |
| 405 | APPLDATA monitor record, i.e. enables or disables monitoring this record |
| 406 | on the z/VM side. |
| 407 | |
| 408 | Default is disabled. |
| 409 | This can also be compiled as a module, which will be called |
| 410 | appldata_os.o. |
| 411 | |
| 412 | config APPLDATA_NET_SUM |
| 413 | tristate "Monitor overall network statistics" |
| 414 | depends on APPLDATA_BASE |
| 415 | help |
| 416 | This provides network related data to the Linux - VM Monitor Stream, |
| 417 | currently there is only a total sum of network I/O statistics, no |
| 418 | per-interface data. |
| 419 | Writing 1 or 0 to /proc/appldata/net_sum 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 | |
| 423 | Default is disabled. |
| 424 | This can also be compiled as a module, which will be called |
| 425 | appldata_net_sum.o. |
| 426 | |
| 427 | config NO_IDLE_HZ |
| 428 | bool "No HZ timer ticks in idle" |
| 429 | help |
| 430 | Switches the regular HZ timer off when the system is going idle. |
| 431 | This helps z/VM to detect that the Linux system is idle. VM can |
| 432 | then "swap-out" this guest which reduces memory usage. It also |
| 433 | reduces the overhead of idle systems. |
| 434 | |
| 435 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. |
| 436 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ |
| 437 | timer is active. |
| 438 | |
| 439 | config NO_IDLE_HZ_INIT |
| 440 | bool "HZ timer in idle off by default" |
| 441 | depends on NO_IDLE_HZ |
| 442 | help |
| 443 | The HZ timer is switched off in idle by default. That means the |
| 444 | HZ timer is already disabled at boot time. |
| 445 | |
Heiko Carstens | cf13f0e | 2005-06-25 14:58:11 -0700 | [diff] [blame] | 446 | config KEXEC |
| 447 | bool "kexec system call (EXPERIMENTAL)" |
| 448 | depends on EXPERIMENTAL |
| 449 | help |
| 450 | kexec is a system call that implements the ability to shutdown your |
| 451 | current kernel, and to start another kernel. It is like a reboot |
| 452 | but is independent of hardware/microcode support. |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | endmenu |
| 455 | |
Sam Ravnborg | d5950b4 | 2005-07-11 21:03:49 -0700 | [diff] [blame] | 456 | source "net/Kconfig" |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | config PCMCIA |
| 459 | bool |
| 460 | default n |
| 461 | |
| 462 | source "drivers/base/Kconfig" |
| 463 | |
| 464 | source "drivers/scsi/Kconfig" |
| 465 | |
| 466 | source "drivers/s390/Kconfig" |
| 467 | |
Sam Ravnborg | d5950b4 | 2005-07-11 21:03:49 -0700 | [diff] [blame] | 468 | source "drivers/net/Kconfig" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | source "fs/Kconfig" |
| 471 | |
| 472 | source "arch/s390/oprofile/Kconfig" |
| 473 | |
| 474 | source "arch/s390/Kconfig.debug" |
| 475 | |
| 476 | source "security/Kconfig" |
| 477 | |
| 478 | source "crypto/Kconfig" |
| 479 | |
| 480 | source "lib/Kconfig" |