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

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