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

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