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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# Library configuration
3#
4
Lai Jiangshan4370aa42009-03-06 17:21:46 +01005config BINARY_PRINTF
6 def_bool n
7
Linus Torvalds1da177e2005-04-16 15:20:36 -07008menu "Library routines"
9
David Woodhousef5e70d02009-07-13 11:35:12 +010010config RAID6_PQ
11 tristate
12
Akinobu Mitaa5cfc1e2006-12-08 02:36:25 -080013config BITREVERSE
14 tristate
15
Oskar Schirmer8759ef32009-06-11 14:51:15 +010016config RATIONAL
17 boolean
18
David S. Miller29225852012-05-24 13:12:28 -070019config GENERIC_STRNCPY_FROM_USER
20 bool
21
Linus Torvaldsa08c5352012-05-26 11:06:38 -070022config GENERIC_STRNLEN_USER
23 bool
24
Andy Shevchenko4cd57732013-06-04 19:46:26 +030025config GENERIC_NET_UTILS
26 bool
27
Alexander van Heukelum19870de2008-04-25 13:12:53 +020028config GENERIC_FIND_FIRST_BIT
Jan Beulich9ba16082008-10-15 22:01:38 -070029 bool
Alexander van Heukelum19870de2008-04-25 13:12:53 +020030
Michael S. Tsirkinb9236502012-01-30 00:20:48 +020031config NO_GENERIC_PCI_IOPORT_MAP
32 bool
33
Michael S. Tsirkin66eab4d2011-11-24 20:45:20 +020034config GENERIC_PCI_IOMAP
35 bool
36
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020037config GENERIC_IOMAP
38 bool
Michael S. Tsirkin66eab4d2011-11-24 20:45:20 +020039 select GENERIC_PCI_IOMAP
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020040
Richard Weinberger087fafd2012-02-07 01:22:46 +010041config GENERIC_IO
42 boolean
43 default n
44
Wolfram Sang4ccf4be2011-08-31 20:35:40 +020045config STMP_DEVICE
46 bool
47
Oleg Nesterov22b361d2012-12-17 16:01:39 -080048config PERCPU_RWSEM
49 boolean
50
Linus Torvaldsbc08b442013-09-02 12:12:15 -070051config ARCH_USE_CMPXCHG_LOCKREF
52 bool
53
54config CMPXCHG_LOCKREF
55 def_bool y if ARCH_USE_CMPXCHG_LOCKREF
56 depends on SMP
57 depends on !GENERIC_LOCKBREAK
58 depends on !DEBUG_SPINLOCK
59 depends on !DEBUG_LOCK_ALLOC
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061config CRC_CCITT
62 tristate "CRC-CCITT functions"
63 help
64 This option is provided for the case where no in-kernel-tree
65 modules require CRC-CCITT functions, but a module built outside
66 the kernel tree does. Such modules that use library CRC-CCITT
67 functions require M here.
68
Evgeniy Polyakov7657ec12005-08-17 15:17:26 +040069config CRC16
70 tristate "CRC16 functions"
71 help
72 This option is provided for the case where no in-kernel-tree
73 modules require CRC16 functions, but a module built outside
74 the kernel tree does. Such modules that use library CRC16
75 functions require M here.
76
Martin K. Petersenf11f5942008-06-25 11:22:42 -040077config CRC_T10DIF
78 tristate "CRC calculation for the T10 Data Integrity Field"
Herbert Xu684115212013-09-07 12:56:26 +100079 select CRYPTO
80 select CRYPTO_CRCT10DIF
Martin K. Petersenf11f5942008-06-25 11:22:42 -040081 help
82 This option is only needed if a module that's not in the
83 kernel tree needs to calculate CRC checks for use with the
84 SCSI data integrity subsystem.
85
Ivo van Doorn3e7cbae2006-06-12 16:17:04 +020086config CRC_ITU_T
87 tristate "CRC ITU-T V.41 functions"
88 help
89 This option is provided for the case where no in-kernel-tree
90 modules require CRC ITU-T V.41 functions, but a module built outside
91 the kernel tree does. Such modules that use library CRC ITU-T V.41
92 functions require M here.
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094config CRC32
Darrick J. Wong46c58012012-03-23 15:02:25 -070095 tristate "CRC32/CRC32c functions"
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 default y
Akinobu Mita906d66d2006-12-08 02:36:25 -080097 select BITREVERSE
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 help
99 This option is provided for the case where no in-kernel-tree
Darrick J. Wong46c58012012-03-23 15:02:25 -0700100 modules require CRC32/CRC32c functions, but a module built outside
101 the kernel tree does. Such modules that use library CRC32/CRC32c
102 functions require M here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Bob Pearson3863ef32012-03-23 15:02:22 -0700104config CRC32_SELFTEST
105 bool "CRC32 perform self test on init"
106 default n
107 depends on CRC32
108 help
109 This option enables the CRC32 library functions to perform a
110 self test on initialization. The self test computes crc32_le
111 and crc32_be over byte strings with random alignment and length
112 and computes the total elapsed time and number of bytes processed.
113
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700114choice
115 prompt "CRC32 implementation"
116 depends on CRC32
117 default CRC32_SLICEBY8
Darrick J. Wong82edb4b2012-03-28 14:42:56 -0700118 help
119 This option allows a kernel builder to override the default choice
120 of CRC32 algorithm. Choose the default ("slice by 8") unless you
121 know that you need one of the others.
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700122
123config CRC32_SLICEBY8
124 bool "Slice by 8 bytes"
125 help
126 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
127 This is the fastest algorithm, but comes with a 8KiB lookup table.
128 Most modern processors have enough cache to hold this table without
129 thrashing the cache.
130
131 This is the default implementation choice. Choose this one unless
132 you have a good reason not to.
133
134config CRC32_SLICEBY4
135 bool "Slice by 4 bytes"
136 help
137 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
138 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
139 table.
140
141 Only choose this option if you know what you are doing.
142
143config CRC32_SARWATE
144 bool "Sarwate's Algorithm (one byte at a time)"
145 help
146 Calculate checksum a byte at a time using Sarwate's algorithm. This
147 is not particularly fast, but has a small 256 byte lookup table.
148
149 Only choose this option if you know what you are doing.
150
151config CRC32_BIT
152 bool "Classic Algorithm (one bit at a time)"
153 help
154 Calculate checksum one bit at a time. This is VERY slow, but has
155 no lookup table. This is provided as a debugging option.
156
157 Only choose this option if you are debugging crc32.
158
159endchoice
160
Jan Nikitenkoad241522007-07-17 04:04:03 -0700161config CRC7
162 tristate "CRC7 functions"
163 help
164 This option is provided for the case where no in-kernel-tree
165 modules require CRC7 functions, but a module built outside
166 the kernel tree does. Such modules that use library CRC7
167 functions require M here.
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169config LIBCRC32C
170 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
Herbert Xu93027352008-11-13 22:05:13 +0800171 select CRYPTO
Herbert Xu69c35ef2008-11-07 15:11:47 +0800172 select CRYPTO_CRC32C
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 help
174 This option is provided for the case where no in-kernel-tree
175 modules require CRC32c functions, but a module built outside the
176 kernel tree does. Such modules that use library CRC32c functions
177 require M here. See Castagnoli93.
178 Module will be libcrc32c.
179
Arend van Spriel71509622011-05-31 11:22:15 +0200180config CRC8
181 tristate "CRC8 function"
182 help
183 This option provides CRC8 function. Drivers may select this
184 when they need to do cyclic redundancy check according CRC8
185 algorithm. Module will be called crc8.
186
Al Viroe65e1fc2006-09-12 03:04:40 -0400187config AUDIT_GENERIC
188 bool
189 depends on AUDIT && !AUDIT_ARCH
190 default y
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192#
193# compression support is select'ed if needed
194#
195config ZLIB_INFLATE
196 tristate
197
198config ZLIB_DEFLATE
199 tristate
200
Richard Purdie64c70b12007-07-10 17:22:24 -0700201config LZO_COMPRESS
202 tristate
203
204config LZO_DECOMPRESS
205 tristate
206
Chanho Minc72ac7a2013-07-08 16:01:49 -0700207config LZ4_COMPRESS
208 tristate
209
210config LZ4HC_COMPRESS
211 tristate
212
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700213config LZ4_DECOMPRESS
214 tristate
215
Lasse Collin24fa0402011-01-12 17:01:22 -0800216source "lib/xz/Kconfig"
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218#
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800219# These all provide a common interface (hence the apparent duplication with
220# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
221#
222config DECOMPRESS_GZIP
H. Peter Anvin7856a16e2009-01-07 00:01:43 -0800223 select ZLIB_INFLATE
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800224 tristate
225
226config DECOMPRESS_BZIP2
227 tristate
228
229config DECOMPRESS_LZMA
230 tristate
231
Lasse Collin3ebe1242011-01-12 17:01:23 -0800232config DECOMPRESS_XZ
233 select XZ_DEC
234 tristate
235
Albin Tonnerrecacb2462010-01-08 14:42:46 -0800236config DECOMPRESS_LZO
237 select LZO_DECOMPRESS
238 tristate
239
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700240config DECOMPRESS_LZ4
241 select LZ4_DECOMPRESS
242 tristate
243
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800244#
Jes Sorensenf14f75b2005-06-21 17:15:02 -0700245# Generic allocator support is selected if needed
246#
247config GENERIC_ALLOCATOR
248 boolean
249
250#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251# reed solomon support is select'ed if needed
252#
253config REED_SOLOMON
254 tristate
255
256config REED_SOLOMON_ENC8
257 boolean
258
259config REED_SOLOMON_DEC8
260 boolean
261
262config REED_SOLOMON_ENC16
263 boolean
264
265config REED_SOLOMON_DEC16
266 boolean
267
David S. Millerf7704342005-06-24 17:39:03 -0700268#
Ivan Djelic437aa562011-03-11 11:05:32 +0100269# BCH support is selected if needed
270#
271config BCH
272 tristate
273
274config 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
290config 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
300config 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#
David S. Millerf7704342005-06-24 17:39:03 -0700308# Textsearch support is select'ed if needed
309#
Thomas Graf2de4ff72005-06-23 20:49:30 -0700310config TEXTSEARCH
David S. Millerf7704342005-06-24 17:39:03 -0700311 boolean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Thomas Grafdf3fb932005-06-23 20:58:37 -0700313config TEXTSEARCH_KMP
David S. Millerf7704342005-06-24 17:39:03 -0700314 tristate
Thomas Grafdf3fb932005-06-23 20:58:37 -0700315
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700316config TEXTSEARCH_BM
David S. Miller29cb9f92005-08-25 16:23:11 -0700317 tristate
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700318
Thomas Graf6408f792005-06-23 20:59:16 -0700319config TEXTSEARCH_FSM
David S. Millerf7704342005-06-24 17:39:03 -0700320 tristate
Thomas Graf6408f792005-06-23 20:59:16 -0700321
Joern Engel5db53f32009-11-20 20:13:39 +0100322config BTREE
323 boolean
324
David Howells3cb98952013-09-24 10:35:17 +0100325config 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
Al Viro5ea81762007-02-11 15:41:31 +0000339config HAS_IOMEM
Al Viroee36c2b2006-12-13 00:35:00 -0800340 boolean
Al Viro5ea81762007-02-11 15:41:31 +0000341 depends on !NO_IOMEM
Richard Weinberger087fafd2012-02-07 01:22:46 +0100342 select GENERIC_IO
Al Viro5ea81762007-02-11 15:41:31 +0000343 default y
344
345config HAS_IOPORT
346 boolean
347 depends on HAS_IOMEM && !NO_IOPORT
Al Viroee36c2b2006-12-13 00:35:00 -0800348 default y
349
Heiko Carstens411f0f32007-05-06 14:49:09 -0700350config HAS_DMA
351 boolean
352 depends on !NO_DMA
353 default y
354
Geert Uytterhoeven928923c2007-08-22 14:01:36 -0700355config CHECK_SIGNATURE
356 bool
357
Rusty Russellaab46da2008-12-13 21:20:27 +1030358config 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
Rusty Russell8c384cd2009-01-01 10:12:30 +1030365config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
366 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
Kees Cook525c1f92013-01-16 18:54:16 -0800367 depends on BROKEN
Rusty Russell8c384cd2009-01-01 10:12:30 +1030368
Ben Hutchingsc39649c2011-01-19 11:03:25 +0000369config CPU_RMAP
370 bool
371 depends on SMP
372
Tom Herbert75957ba2011-11-28 16:32:35 +0000373config DQL
374 bool
375
Geert Uytterhoevene9cc8bd2009-03-04 14:53:30 +0800376#
377# Netlink attribute parsing support is select'ed if needed
378#
379config NLATTR
380 bool
381
Paul Mackerras09d4e0e2009-06-12 21:10:05 +0000382#
383# Generic 64-bit atomic support is selected if needed
384#
385config GENERIC_ATOMIC64
386 bool
387
Catalin Marinas74634492012-07-30 14:41:09 -0700388config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
389 def_bool y if GENERIC_ATOMIC64
390
Philipp Reisnerb411b362009-09-25 16:07:19 -0700391config LRU_CACHE
392 tristate
393
Bruno Randolfc5485a72010-11-16 10:58:37 +0900394config AVERAGE
Michael Buescha7a9a242011-03-01 20:03:05 +0100395 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.
Bruno Randolfc5485a72010-11-16 10:58:37 +0900403
David Millerc6df4b12012-02-02 00:17:54 +0200404config CLZ_TAB
405 bool
406
Arend van Spriel10f81132011-05-31 11:22:16 +0200407config CORDIC
Michael Wittend89ce932011-07-29 12:59:51 +0000408 tristate "CORDIC algorithm"
Arend van Spriel10f81132011-05-31 11:22:16 +0200409 help
Michael Witten435a95c2011-07-29 13:36:04 +0000410 This option provides an implementation of the CORDIC algorithm;
411 calculations are in fixed point. Module will be called cordic.
Arend van Spriel10f81132011-05-31 11:22:16 +0200412
Aneesh V9c1c21a2012-04-27 17:54:03 +0530413config 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
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300421config MPILIB
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200422 tristate
David Millerc6df4b12012-02-02 00:17:54 +0200423 select CLZ_TAB
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300424 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
Dmitry Kasatkin5e8898e2012-01-17 17:12:03 +0200429config SIGNATURE
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200430 tristate
Dmitry Kasatkinbe440ec2012-01-17 17:12:04 +0200431 depends on KEYS && CRYPTO
432 select CRYPTO_SHA1
Dmitry Kasatkin051dbb92011-10-14 15:25:16 +0300433 select MPILIB
434 help
435 Digital signature verification. Currently only RSA is supported.
436 Implementation is done using GnuPG MPI library
437
David Daneyab253832012-07-05 18:12:38 +0200438#
439# libfdt files, only selected if needed.
440#
441config LIBFDT
442 bool
443
David Howellsa77ad6e2012-09-21 23:30:46 +0100444config OID_REGISTRY
445 tristate
446 help
447 Enable fast lookup object identifier registry.
448
Matthew Garrett0635eb82013-04-15 13:09:45 -0700449config UCS2_STRING
450 tristate
451
Geert Uytterhoevenee89bd62013-06-09 11:46:43 +0200452source "lib/fonts/Kconfig"
453
Thomas Graf2de4ff72005-06-23 20:49:30 -0700454endmenu