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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 AUDIT_ARCH_COMPAT_GENERIC
186         bool
187         default n
188 
189 config AUDIT_COMPAT_GENERIC
190         bool
191         depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
192         default y
193 
194 config RANDOM32_SELFTEST
195         bool "PRNG perform self test on init"
196         default n
197         help
198           This option enables the 32 bit PRNG library functions to perform a
199           self test on initialization.
200 
201 #
202 # compression support is select'ed if needed
203 #
204 config ZLIB_INFLATE
205         tristate
206 
207 config ZLIB_DEFLATE
208         tristate
209 
210 config LZO_COMPRESS
211         tristate
212 
213 config LZO_DECOMPRESS
214         tristate
215 
216 config LZ4_COMPRESS
217         tristate
218 
219 config LZ4HC_COMPRESS
220         tristate
221 
222 config LZ4_DECOMPRESS
223         tristate
224 
225 source "lib/xz/Kconfig"
226 
227 #
228 # These all provide a common interface (hence the apparent duplication with
229 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
230 #
231 config DECOMPRESS_GZIP
232         select ZLIB_INFLATE
233         tristate
234 
235 config DECOMPRESS_BZIP2
236         tristate
237 
238 config DECOMPRESS_LZMA
239         tristate
240 
241 config DECOMPRESS_XZ
242         select XZ_DEC
243         tristate
244 
245 config DECOMPRESS_LZO
246         select LZO_DECOMPRESS
247         tristate
248 
249 config DECOMPRESS_LZ4
250         select LZ4_DECOMPRESS
251         tristate
252 
253 #
254 # Generic allocator support is selected if needed
255 #
256 config GENERIC_ALLOCATOR
257         boolean
258 
259 #
260 # reed solomon support is select'ed if needed
261 #
262 config REED_SOLOMON
263         tristate
264         
265 config REED_SOLOMON_ENC8
266         boolean
267 
268 config REED_SOLOMON_DEC8
269         boolean
270 
271 config REED_SOLOMON_ENC16
272         boolean
273 
274 config REED_SOLOMON_DEC16
275         boolean
276 
277 #
278 # BCH support is selected if needed
279 #
280 config BCH
281         tristate
282 
283 config BCH_CONST_PARAMS
284         boolean
285         help
286           Drivers may select this option to force specific constant
287           values for parameters 'm' (Galois field order) and 't'
288           (error correction capability). Those specific values must
289           be set by declaring default values for symbols BCH_CONST_M
290           and BCH_CONST_T.
291           Doing so will enable extra compiler optimizations,
292           improving encoding and decoding performance up to 2x for
293           usual (m,t) values (typically such that m*t < 200).
294           When this option is selected, the BCH library supports
295           only a single (m,t) configuration. This is mainly useful
296           for NAND flash board drivers requiring known, fixed BCH
297           parameters.
298 
299 config BCH_CONST_M
300         int
301         range 5 15
302         help
303           Constant value for Galois field order 'm'. If 'k' is the
304           number of data bits to protect, 'm' should be chosen such
305           that (k + m*t) <= 2**m - 1.
306           Drivers should declare a default value for this symbol if
307           they select option BCH_CONST_PARAMS.
308 
309 config BCH_CONST_T
310         int
311         help
312           Constant value for error correction capability in bits 't'.
313           Drivers should declare a default value for this symbol if
314           they select option BCH_CONST_PARAMS.
315 
316 #
317 # Textsearch support is select'ed if needed
318 #
319 config TEXTSEARCH
320         boolean
321 
322 config TEXTSEARCH_KMP
323         tristate
324 
325 config TEXTSEARCH_BM
326         tristate
327 
328 config TEXTSEARCH_FSM
329         tristate
330 
331 config BTREE
332         boolean
333 
334 config INTERVAL_TREE
335         boolean
336         help
337           Simple, embeddable, interval-tree. Can find the start of an
338           overlapping range in log(n) time and then iterate over all
339           overlapping nodes. The algorithm is implemented as an
340           augmented rbtree.
341 
342           See:
343 
344                 Documentation/rbtree.txt
345 
346           for more information.
347 
348 config ASSOCIATIVE_ARRAY
349         bool
350         help
351           Generic associative array.  Can be searched and iterated over whilst
352           it is being modified.  It is also reasonably quick to search and
353           modify.  The algorithms are non-recursive, and the trees are highly
354           capacious.
355 
356           See:
357 
358                 Documentation/assoc_array.txt
359 
360           for more information.
361 
362 config HAS_IOMEM
363         boolean
364         depends on !NO_IOMEM
365         select GENERIC_IO
366         default y
367 
368 config HAS_IOPORT_MAP
369         boolean
370         depends on HAS_IOMEM && !NO_IOPORT_MAP
371         default y
372 
373 config HAS_DMA
374         boolean
375         depends on !NO_DMA
376         default y
377 
378 config CHECK_SIGNATURE
379         bool
380 
381 config CPUMASK_OFFSTACK
382         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
383         help
384           Use dynamic allocation for cpumask_var_t, instead of putting
385           them on the stack.  This is a bit more expensive, but avoids
386           stack overflow.
387 
388 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
389        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
390        depends on BROKEN
391 
392 config CPU_RMAP
393         bool
394         depends on SMP
395 
396 config DQL
397         bool
398 
399 #
400 # Netlink attribute parsing support is select'ed if needed
401 #
402 config NLATTR
403         bool
404 
405 #
406 # Generic 64-bit atomic support is selected if needed
407 #
408 config GENERIC_ATOMIC64
409        bool
410 
411 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
412         def_bool y if GENERIC_ATOMIC64
413 
414 config LRU_CACHE
415         tristate
416 
417 config AVERAGE
418         bool "Averaging functions"
419         help
420           This option is provided for the case where no in-kernel-tree
421           modules require averaging functions, but a module built outside
422           the kernel tree does. Such modules that use library averaging
423           functions require Y here.
424 
425           If unsure, say N.
426 
427 config CLZ_TAB
428         bool
429 
430 config CORDIC
431         tristate "CORDIC algorithm"
432         help
433           This option provides an implementation of the CORDIC algorithm;
434           calculations are in fixed point. Module will be called cordic.
435 
436 config DDR
437         bool "JEDEC DDR data"
438         help
439           Data from JEDEC specs for DDR SDRAM memories,
440           particularly the AC timing parameters and addressing
441           information. This data is useful for drivers handling
442           DDR SDRAM controllers.
443 
444 config MPILIB
445         tristate
446         select CLZ_TAB
447         help
448           Multiprecision maths library from GnuPG.
449           It is used to implement RSA digital signature verification,
450           which is used by IMA/EVM digital signature extension.
451 
452 config SIGNATURE
453         tristate
454         depends on KEYS && CRYPTO
455         select CRYPTO_SHA1
456         select MPILIB
457         help
458           Digital signature verification. Currently only RSA is supported.
459           Implementation is done using GnuPG MPI library
460 
461 #
462 # libfdt files, only selected if needed.
463 #
464 config LIBFDT
465         bool
466 
467 config OID_REGISTRY
468         tristate
469         help
470           Enable fast lookup object identifier registry.
471 
472 config UCS2_STRING
473         tristate
474 
475 source "lib/fonts/Kconfig"
476 
477 endmenu

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