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

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