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Linux/lib/Kconfig

  1 #
  2 # Library configuration
  3 #
  4 
  5 config BINARY_PRINTF
  6         def_bool n
  7 
  8 menu "Library routines"
  9 
 10 config RAID6_PQ
 11         tristate
 12 
 13 config BITREVERSE
 14         tristate
 15 
 16 config HAVE_ARCH_BITREVERSE
 17         bool
 18         default n
 19         depends on BITREVERSE
 20         help
 21           This option enables the use of hardware bit-reversal instructions on
 22           architectures which support such operations.
 23 
 24 config RATIONAL
 25         bool
 26 
 27 config GENERIC_STRNCPY_FROM_USER
 28         bool
 29 
 30 config GENERIC_STRNLEN_USER
 31         bool
 32 
 33 config GENERIC_NET_UTILS
 34         bool
 35 
 36 config GENERIC_FIND_FIRST_BIT
 37         bool
 38 
 39 config NO_GENERIC_PCI_IOPORT_MAP
 40         bool
 41 
 42 config GENERIC_PCI_IOMAP
 43         bool
 44 
 45 config GENERIC_IOMAP
 46         bool
 47         select GENERIC_PCI_IOMAP
 48 
 49 config GENERIC_IO
 50         bool
 51         default n
 52 
 53 config STMP_DEVICE
 54         bool
 55 
 56 config ARCH_USE_CMPXCHG_LOCKREF
 57         bool
 58 
 59 config ARCH_HAS_FAST_MULTIPLIER
 60         bool
 61 
 62 config CRC_CCITT
 63         tristate "CRC-CCITT functions"
 64         help
 65           This option is provided for the case where no in-kernel-tree
 66           modules require CRC-CCITT functions, but a module built outside
 67           the kernel tree does. Such modules that use library CRC-CCITT
 68           functions require M here.
 69 
 70 config CRC16
 71         tristate "CRC16 functions"
 72         help
 73           This option is provided for the case where no in-kernel-tree
 74           modules require CRC16 functions, but a module built outside
 75           the kernel tree does. Such modules that use library CRC16
 76           functions require M here.
 77 
 78 config CRC_T10DIF
 79         tristate "CRC calculation for the T10 Data Integrity Field"
 80         select CRYPTO
 81         select CRYPTO_CRCT10DIF
 82         help
 83           This option is only needed if a module that's not in the
 84           kernel tree needs to calculate CRC checks for use with the
 85           SCSI data integrity subsystem.
 86 
 87 config CRC_ITU_T
 88         tristate "CRC ITU-T V.41 functions"
 89         help
 90           This option is provided for the case where no in-kernel-tree
 91           modules require CRC ITU-T V.41 functions, but a module built outside
 92           the kernel tree does. Such modules that use library CRC ITU-T V.41
 93           functions require M here.
 94 
 95 config CRC32
 96         tristate "CRC32/CRC32c functions"
 97         default y
 98         select BITREVERSE
 99         help
100           This option is provided for the case where no in-kernel-tree
101           modules require CRC32/CRC32c functions, but a module built outside
102           the kernel tree does. Such modules that use library CRC32/CRC32c
103           functions require M here.
104 
105 config CRC32_SELFTEST
106         bool "CRC32 perform self test on init"
107         default n
108         depends on CRC32
109         help
110           This option enables the CRC32 library functions to perform a
111           self test on initialization. The self test computes crc32_le
112           and crc32_be over byte strings with random alignment and length
113           and computes the total elapsed time and number of bytes processed.
114 
115 choice
116         prompt "CRC32 implementation"
117         depends on CRC32
118         default CRC32_SLICEBY8
119         help
120           This option allows a kernel builder to override the default choice
121           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
122           know that you need one of the others.
123 
124 config CRC32_SLICEBY8
125         bool "Slice by 8 bytes"
126         help
127           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
128           This is the fastest algorithm, but comes with a 8KiB lookup table.
129           Most modern processors have enough cache to hold this table without
130           thrashing the cache.
131 
132           This is the default implementation choice.  Choose this one unless
133           you have a good reason not to.
134 
135 config CRC32_SLICEBY4
136         bool "Slice by 4 bytes"
137         help
138           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
139           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
140           table.
141 
142           Only choose this option if you know what you are doing.
143 
144 config CRC32_SARWATE
145         bool "Sarwate's Algorithm (one byte at a time)"
146         help
147           Calculate checksum a byte at a time using Sarwate's algorithm.  This
148           is not particularly fast, but has a small 256 byte lookup table.
149 
150           Only choose this option if you know what you are doing.
151 
152 config CRC32_BIT
153         bool "Classic Algorithm (one bit at a time)"
154         help
155           Calculate checksum one bit at a time.  This is VERY slow, but has
156           no lookup table.  This is provided as a debugging option.
157 
158           Only choose this option if you are debugging crc32.
159 
160 endchoice
161 
162 config CRC7
163         tristate "CRC7 functions"
164         help
165           This option is provided for the case where no in-kernel-tree
166           modules require CRC7 functions, but a module built outside
167           the kernel tree does. Such modules that use library CRC7
168           functions require M here.
169 
170 config LIBCRC32C
171         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
172         select CRYPTO
173         select CRYPTO_CRC32C
174         help
175           This option is provided for the case where no in-kernel-tree
176           modules require CRC32c functions, but a module built outside the
177           kernel tree does. Such modules that use library CRC32c functions
178           require M here.  See Castagnoli93.
179           Module will be libcrc32c.
180 
181 config CRC8
182         tristate "CRC8 function"
183         help
184           This option provides CRC8 function. Drivers may select this
185           when they need to do cyclic redundancy check according CRC8
186           algorithm. Module will be called crc8.
187 
188 config AUDIT_GENERIC
189         bool
190         depends on AUDIT && !AUDIT_ARCH
191         default y
192 
193 config AUDIT_ARCH_COMPAT_GENERIC
194         bool
195         default n
196 
197 config AUDIT_COMPAT_GENERIC
198         bool
199         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
200         default y
201 
202 config RANDOM32_SELFTEST
203         bool "PRNG perform self test on init"
204         default n
205         help
206           This option enables the 32 bit PRNG library functions to perform a
207           self test on initialization.
208 
209 #
210 # compression support is select'ed if needed
211 #
212 config 842_COMPRESS
213         select CRC32
214         tristate
215 
216 config 842_DECOMPRESS
217         select CRC32
218         tristate
219 
220 config ZLIB_INFLATE
221         tristate
222 
223 config ZLIB_DEFLATE
224         tristate
225         select BITREVERSE
226 
227 config LZO_COMPRESS
228         tristate
229 
230 config LZO_DECOMPRESS
231         tristate
232 
233 config LZ4_COMPRESS
234         tristate
235 
236 config LZ4HC_COMPRESS
237         tristate
238 
239 config LZ4_DECOMPRESS
240         tristate
241 
242 source "lib/xz/Kconfig"
243 
244 #
245 # These all provide a common interface (hence the apparent duplication with
246 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
247 #
248 config DECOMPRESS_GZIP
249         select ZLIB_INFLATE
250         tristate
251 
252 config DECOMPRESS_BZIP2
253         tristate
254 
255 config DECOMPRESS_LZMA
256         tristate
257 
258 config DECOMPRESS_XZ
259         select XZ_DEC
260         tristate
261 
262 config DECOMPRESS_LZO
263         select LZO_DECOMPRESS
264         tristate
265 
266 config DECOMPRESS_LZ4
267         select LZ4_DECOMPRESS
268         tristate
269 
270 #
271 # Generic allocator support is selected if needed
272 #
273 config GENERIC_ALLOCATOR
274         bool
275 
276 #
277 # reed solomon support is select'ed if needed
278 #
279 config REED_SOLOMON
280         tristate
281         
282 config REED_SOLOMON_ENC8
283         bool
284 
285 config REED_SOLOMON_DEC8
286         bool
287 
288 config REED_SOLOMON_ENC16
289         bool
290 
291 config REED_SOLOMON_DEC16
292         bool
293 
294 #
295 # BCH support is selected if needed
296 #
297 config BCH
298         tristate
299 
300 config BCH_CONST_PARAMS
301         bool
302         help
303           Drivers may select this option to force specific constant
304           values for parameters 'm' (Galois field order) and 't'
305           (error correction capability). Those specific values must
306           be set by declaring default values for symbols BCH_CONST_M
307           and BCH_CONST_T.
308           Doing so will enable extra compiler optimizations,
309           improving encoding and decoding performance up to 2x for
310           usual (m,t) values (typically such that m*t < 200).
311           When this option is selected, the BCH library supports
312           only a single (m,t) configuration. This is mainly useful
313           for NAND flash board drivers requiring known, fixed BCH
314           parameters.
315 
316 config BCH_CONST_M
317         int
318         range 5 15
319         help
320           Constant value for Galois field order 'm'. If 'k' is the
321           number of data bits to protect, 'm' should be chosen such
322           that (k + m*t) <= 2**m - 1.
323           Drivers should declare a default value for this symbol if
324           they select option BCH_CONST_PARAMS.
325 
326 config BCH_CONST_T
327         int
328         help
329           Constant value for error correction capability in bits 't'.
330           Drivers should declare a default value for this symbol if
331           they select option BCH_CONST_PARAMS.
332 
333 #
334 # Textsearch support is select'ed if needed
335 #
336 config TEXTSEARCH
337         bool
338 
339 config TEXTSEARCH_KMP
340         tristate
341 
342 config TEXTSEARCH_BM
343         tristate
344 
345 config TEXTSEARCH_FSM
346         tristate
347 
348 config BTREE
349         bool
350 
351 config INTERVAL_TREE
352         bool
353         help
354           Simple, embeddable, interval-tree. Can find the start of an
355           overlapping range in log(n) time and then iterate over all
356           overlapping nodes. The algorithm is implemented as an
357           augmented rbtree.
358 
359           See:
360 
361                 Documentation/rbtree.txt
362 
363           for more information.
364 
365 config ASSOCIATIVE_ARRAY
366         bool
367         help
368           Generic associative array.  Can be searched and iterated over whilst
369           it is being modified.  It is also reasonably quick to search and
370           modify.  The algorithms are non-recursive, and the trees are highly
371           capacious.
372 
373           See:
374 
375                 Documentation/assoc_array.txt
376 
377           for more information.
378 
379 config HAS_IOMEM
380         bool
381         depends on !NO_IOMEM
382         select GENERIC_IO
383         default y
384 
385 config HAS_IOPORT_MAP
386         bool
387         depends on HAS_IOMEM && !NO_IOPORT_MAP
388         default y
389 
390 config HAS_DMA
391         bool
392         depends on !NO_DMA
393         default y
394 
395 config CHECK_SIGNATURE
396         bool
397 
398 config CPUMASK_OFFSTACK
399         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
400         help
401           Use dynamic allocation for cpumask_var_t, instead of putting
402           them on the stack.  This is a bit more expensive, but avoids
403           stack overflow.
404 
405 config CPU_RMAP
406         bool
407         depends on SMP
408 
409 config DQL
410         bool
411 
412 config GLOB
413         bool
414 #       This actually supports modular compilation, but the module overhead
415 #       is ridiculous for the amount of code involved.  Until an out-of-tree
416 #       driver asks for it, we'll just link it directly it into the kernel
417 #       when required.  Since we're ignoring out-of-tree users, there's also
418 #       no need bother prompting for a manual decision:
419 #       prompt "glob_match() function"
420         help
421           This option provides a glob_match function for performing
422           simple text pattern matching.  It originated in the ATA code
423           to blacklist particular drive models, but other device drivers
424           may need similar functionality.
425 
426           All drivers in the Linux kernel tree that require this function
427           should automatically select this option.  Say N unless you
428           are compiling an out-of tree driver which tells you that it
429           depends on this.
430 
431 config GLOB_SELFTEST
432         bool "glob self-test on init"
433         default n
434         depends on GLOB
435         help
436           This option enables a simple self-test of the glob_match
437           function on startup.  It is primarily useful for people
438           working on the code to ensure they haven't introduced any
439           regressions.
440 
441           It only adds a little bit of code and slows kernel boot (or
442           module load) by a small amount, so you're welcome to play with
443           it, but you probably don't need it.
444 
445 #
446 # Netlink attribute parsing support is select'ed if needed
447 #
448 config NLATTR
449         bool
450 
451 #
452 # Generic 64-bit atomic support is selected if needed
453 #
454 config GENERIC_ATOMIC64
455        bool
456 
457 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
458         def_bool y if GENERIC_ATOMIC64
459 
460 config LRU_CACHE
461         tristate
462 
463 config CLZ_TAB
464         bool
465 
466 config CORDIC
467         tristate "CORDIC algorithm"
468         help
469           This option provides an implementation of the CORDIC algorithm;
470           calculations are in fixed point. Module will be called cordic.
471 
472 config DDR
473         bool "JEDEC DDR data"
474         help
475           Data from JEDEC specs for DDR SDRAM memories,
476           particularly the AC timing parameters and addressing
477           information. This data is useful for drivers handling
478           DDR SDRAM controllers.
479 
480 config IRQ_POLL
481         bool "IRQ polling library"
482         help
483           Helper library to poll interrupt mitigation using polling.
484 
485 config MPILIB
486         tristate
487         select CLZ_TAB
488         help
489           Multiprecision maths library from GnuPG.
490           It is used to implement RSA digital signature verification,
491           which is used by IMA/EVM digital signature extension.
492 
493 config SIGNATURE
494         tristate
495         depends on KEYS
496         select CRYPTO
497         select CRYPTO_SHA1
498         select MPILIB
499         help
500           Digital signature verification. Currently only RSA is supported.
501           Implementation is done using GnuPG MPI library
502 
503 #
504 # libfdt files, only selected if needed.
505 #
506 config LIBFDT
507         bool
508 
509 config OID_REGISTRY
510         tristate
511         help
512           Enable fast lookup object identifier registry.
513 
514 config UCS2_STRING
515         tristate
516 
517 source "lib/fonts/Kconfig"
518 
519 config SG_SPLIT
520         def_bool n
521         help
522          Provides a helper to split scatterlists into chunks, each chunk being
523          a scatterlist. This should be selected by a driver or an API which
524          whishes to split a scatterlist amongst multiple DMA channels.
525 
526 #
527 # sg chaining option
528 #
529 
530 config ARCH_HAS_SG_CHAIN
531         def_bool n
532 
533 config ARCH_HAS_PMEM_API
534         bool
535 
536 config ARCH_HAS_MMIO_FLUSH
537         bool
538 
539 config STACKDEPOT
540         bool
541         select STACKTRACE
542 
543 endmenu

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