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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         tristate
214 
215 config 842_DECOMPRESS
216         tristate
217 
218 config ZLIB_INFLATE
219         tristate
220 
221 config ZLIB_DEFLATE
222         tristate
223         select BITREVERSE
224 
225 config LZO_COMPRESS
226         tristate
227 
228 config LZO_DECOMPRESS
229         tristate
230 
231 config LZ4_COMPRESS
232         tristate
233 
234 config LZ4HC_COMPRESS
235         tristate
236 
237 config LZ4_DECOMPRESS
238         tristate
239 
240 source "lib/xz/Kconfig"
241 
242 #
243 # These all provide a common interface (hence the apparent duplication with
244 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
245 #
246 config DECOMPRESS_GZIP
247         select ZLIB_INFLATE
248         tristate
249 
250 config DECOMPRESS_BZIP2
251         tristate
252 
253 config DECOMPRESS_LZMA
254         tristate
255 
256 config DECOMPRESS_XZ
257         select XZ_DEC
258         tristate
259 
260 config DECOMPRESS_LZO
261         select LZO_DECOMPRESS
262         tristate
263 
264 config DECOMPRESS_LZ4
265         select LZ4_DECOMPRESS
266         tristate
267 
268 #
269 # Generic allocator support is selected if needed
270 #
271 config GENERIC_ALLOCATOR
272         bool
273 
274 #
275 # reed solomon support is select'ed if needed
276 #
277 config REED_SOLOMON
278         tristate
279         
280 config REED_SOLOMON_ENC8
281         bool
282 
283 config REED_SOLOMON_DEC8
284         bool
285 
286 config REED_SOLOMON_ENC16
287         bool
288 
289 config REED_SOLOMON_DEC16
290         bool
291 
292 #
293 # BCH support is selected if needed
294 #
295 config BCH
296         tristate
297 
298 config BCH_CONST_PARAMS
299         bool
300         help
301           Drivers may select this option to force specific constant
302           values for parameters 'm' (Galois field order) and 't'
303           (error correction capability). Those specific values must
304           be set by declaring default values for symbols BCH_CONST_M
305           and BCH_CONST_T.
306           Doing so will enable extra compiler optimizations,
307           improving encoding and decoding performance up to 2x for
308           usual (m,t) values (typically such that m*t < 200).
309           When this option is selected, the BCH library supports
310           only a single (m,t) configuration. This is mainly useful
311           for NAND flash board drivers requiring known, fixed BCH
312           parameters.
313 
314 config BCH_CONST_M
315         int
316         range 5 15
317         help
318           Constant value for Galois field order 'm'. If 'k' is the
319           number of data bits to protect, 'm' should be chosen such
320           that (k + m*t) <= 2**m - 1.
321           Drivers should declare a default value for this symbol if
322           they select option BCH_CONST_PARAMS.
323 
324 config BCH_CONST_T
325         int
326         help
327           Constant value for error correction capability in bits 't'.
328           Drivers should declare a default value for this symbol if
329           they select option BCH_CONST_PARAMS.
330 
331 #
332 # Textsearch support is select'ed if needed
333 #
334 config TEXTSEARCH
335         bool
336 
337 config TEXTSEARCH_KMP
338         tristate
339 
340 config TEXTSEARCH_BM
341         tristate
342 
343 config TEXTSEARCH_FSM
344         tristate
345 
346 config BTREE
347         bool
348 
349 config INTERVAL_TREE
350         bool
351         help
352           Simple, embeddable, interval-tree. Can find the start of an
353           overlapping range in log(n) time and then iterate over all
354           overlapping nodes. The algorithm is implemented as an
355           augmented rbtree.
356 
357           See:
358 
359                 Documentation/rbtree.txt
360 
361           for more information.
362 
363 config ASSOCIATIVE_ARRAY
364         bool
365         help
366           Generic associative array.  Can be searched and iterated over whilst
367           it is being modified.  It is also reasonably quick to search and
368           modify.  The algorithms are non-recursive, and the trees are highly
369           capacious.
370 
371           See:
372 
373                 Documentation/assoc_array.txt
374 
375           for more information.
376 
377 config HAS_IOMEM
378         bool
379         depends on !NO_IOMEM
380         select GENERIC_IO
381         default y
382 
383 config HAS_IOPORT_MAP
384         bool
385         depends on HAS_IOMEM && !NO_IOPORT_MAP
386         default y
387 
388 config HAS_DMA
389         bool
390         depends on !NO_DMA
391         default y
392 
393 config CHECK_SIGNATURE
394         bool
395 
396 config CPUMASK_OFFSTACK
397         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
398         help
399           Use dynamic allocation for cpumask_var_t, instead of putting
400           them on the stack.  This is a bit more expensive, but avoids
401           stack overflow.
402 
403 config CPU_RMAP
404         bool
405         depends on SMP
406 
407 config DQL
408         bool
409 
410 config GLOB
411         bool
412 #       This actually supports modular compilation, but the module overhead
413 #       is ridiculous for the amount of code involved.  Until an out-of-tree
414 #       driver asks for it, we'll just link it directly it into the kernel
415 #       when required.  Since we're ignoring out-of-tree users, there's also
416 #       no need bother prompting for a manual decision:
417 #       prompt "glob_match() function"
418         help
419           This option provides a glob_match function for performing
420           simple text pattern matching.  It originated in the ATA code
421           to blacklist particular drive models, but other device drivers
422           may need similar functionality.
423 
424           All drivers in the Linux kernel tree that require this function
425           should automatically select this option.  Say N unless you
426           are compiling an out-of tree driver which tells you that it
427           depends on this.
428 
429 config GLOB_SELFTEST
430         bool "glob self-test on init"
431         default n
432         depends on GLOB
433         help
434           This option enables a simple self-test of the glob_match
435           function on startup.  It is primarily useful for people
436           working on the code to ensure they haven't introduced any
437           regressions.
438 
439           It only adds a little bit of code and slows kernel boot (or
440           module load) by a small amount, so you're welcome to play with
441           it, but you probably don't need it.
442 
443 #
444 # Netlink attribute parsing support is select'ed if needed
445 #
446 config NLATTR
447         bool
448 
449 #
450 # Generic 64-bit atomic support is selected if needed
451 #
452 config GENERIC_ATOMIC64
453        bool
454 
455 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
456         def_bool y if GENERIC_ATOMIC64
457 
458 config LRU_CACHE
459         tristate
460 
461 config CLZ_TAB
462         bool
463 
464 config CORDIC
465         tristate "CORDIC algorithm"
466         help
467           This option provides an implementation of the CORDIC algorithm;
468           calculations are in fixed point. Module will be called cordic.
469 
470 config DDR
471         bool "JEDEC DDR data"
472         help
473           Data from JEDEC specs for DDR SDRAM memories,
474           particularly the AC timing parameters and addressing
475           information. This data is useful for drivers handling
476           DDR SDRAM controllers.
477 
478 config MPILIB
479         tristate
480         select CLZ_TAB
481         help
482           Multiprecision maths library from GnuPG.
483           It is used to implement RSA digital signature verification,
484           which is used by IMA/EVM digital signature extension.
485 
486 config SIGNATURE
487         tristate
488         depends on KEYS
489         select CRYPTO
490         select CRYPTO_SHA1
491         select MPILIB
492         help
493           Digital signature verification. Currently only RSA is supported.
494           Implementation is done using GnuPG MPI library
495 
496 #
497 # libfdt files, only selected if needed.
498 #
499 config LIBFDT
500         bool
501 
502 config OID_REGISTRY
503         tristate
504         help
505           Enable fast lookup object identifier registry.
506 
507 config UCS2_STRING
508         tristate
509 
510 source "lib/fonts/Kconfig"
511 
512 config SG_SPLIT
513         def_bool n
514         help
515          Provides a heler to split scatterlists into chunks, each chunk being a
516          scatterlist. This should be selected by a driver or an API which
517          whishes to split a scatterlist amongst multiple DMA channel.
518 
519 #
520 # sg chaining option
521 #
522 
523 config ARCH_HAS_SG_CHAIN
524         def_bool n
525 
526 config ARCH_HAS_PMEM_API
527         bool
528 
529 config ARCH_HAS_MMIO_FLUSH
530         bool
531 
532 endmenu

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