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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 Mitaa5cfc1ec582006-12-08 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
Alexander van Heukelum19870de2008-04-25 13:12:53 +020025config GENERIC_FIND_FIRST_BIT
Jan Beulich9ba16082008-10-15 22:01:38 -070026 bool
Alexander van Heukelum19870de2008-04-25 13:12:53 +020027
Michael S. Tsirkinb9236502012-01-30 00:20:48 +020028config NO_GENERIC_PCI_IOPORT_MAP
29 bool
30
Michael S. Tsirkin66eab4d2011-11-24 20:45:20 +020031config GENERIC_PCI_IOMAP
32 bool
33
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020034config GENERIC_IOMAP
35 bool
Michael S. Tsirkin66eab4d2011-11-24 20:45:20 +020036 select GENERIC_PCI_IOMAP
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020037
Richard Weinberger087fafd2012-02-07 01:22:46 +010038config GENERIC_IO
39 boolean
40 default n
41
Wolfram Sang4ccf4be2011-08-31 20:35:40 +020042config STMP_DEVICE
43 bool
44
Oleg Nesterov22b361d2012-12-17 16:01:39 -080045config PERCPU_RWSEM
46 boolean
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048config CRC_CCITT
49 tristate "CRC-CCITT functions"
50 help
51 This option is provided for the case where no in-kernel-tree
52 modules require CRC-CCITT functions, but a module built outside
53 the kernel tree does. Such modules that use library CRC-CCITT
54 functions require M here.
55
Evgeniy Polyakov7657ec12005-08-17 15:17:26 +040056config CRC16
57 tristate "CRC16 functions"
58 help
59 This option is provided for the case where no in-kernel-tree
60 modules require CRC16 functions, but a module built outside
61 the kernel tree does. Such modules that use library CRC16
62 functions require M here.
63
Martin K. Petersenf11f5942008-06-25 11:22:42 -040064config CRC_T10DIF
65 tristate "CRC calculation for the T10 Data Integrity Field"
66 help
67 This option is only needed if a module that's not in the
68 kernel tree needs to calculate CRC checks for use with the
69 SCSI data integrity subsystem.
70
Ivo van Doorn3e7cbae2006-06-12 16:17:04 +020071config CRC_ITU_T
72 tristate "CRC ITU-T V.41 functions"
73 help
74 This option is provided for the case where no in-kernel-tree
75 modules require CRC ITU-T V.41 functions, but a module built outside
76 the kernel tree does. Such modules that use library CRC ITU-T V.41
77 functions require M here.
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079config CRC32
Darrick J. Wong46c58012012-03-23 15:02:25 -070080 tristate "CRC32/CRC32c functions"
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 default y
Akinobu Mita906d66d2006-12-08 02:36:25 -080082 select BITREVERSE
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 help
84 This option is provided for the case where no in-kernel-tree
Darrick J. Wong46c58012012-03-23 15:02:25 -070085 modules require CRC32/CRC32c functions, but a module built outside
86 the kernel tree does. Such modules that use library CRC32/CRC32c
87 functions require M here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Bob Pearson3863ef32012-03-23 15:02:22 -070089config CRC32_SELFTEST
90 bool "CRC32 perform self test on init"
91 default n
92 depends on CRC32
93 help
94 This option enables the CRC32 library functions to perform a
95 self test on initialization. The self test computes crc32_le
96 and crc32_be over byte strings with random alignment and length
97 and computes the total elapsed time and number of bytes processed.
98
Darrick J. Wong5cde7652012-03-23 15:02:26 -070099choice
100 prompt "CRC32 implementation"
101 depends on CRC32
102 default CRC32_SLICEBY8
Darrick J. Wong82edb4b2012-03-28 14:42:56 -0700103 help
104 This option allows a kernel builder to override the default choice
105 of CRC32 algorithm. Choose the default ("slice by 8") unless you
106 know that you need one of the others.
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700107
108config CRC32_SLICEBY8
109 bool "Slice by 8 bytes"
110 help
111 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
112 This is the fastest algorithm, but comes with a 8KiB lookup table.
113 Most modern processors have enough cache to hold this table without
114 thrashing the cache.
115
116 This is the default implementation choice. Choose this one unless
117 you have a good reason not to.
118
119config CRC32_SLICEBY4
120 bool "Slice by 4 bytes"
121 help
122 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
123 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
124 table.
125
126 Only choose this option if you know what you are doing.
127
128config CRC32_SARWATE
129 bool "Sarwate's Algorithm (one byte at a time)"
130 help
131 Calculate checksum a byte at a time using Sarwate's algorithm. This
132 is not particularly fast, but has a small 256 byte lookup table.
133
134 Only choose this option if you know what you are doing.
135
136config CRC32_BIT
137 bool "Classic Algorithm (one bit at a time)"
138 help
139 Calculate checksum one bit at a time. This is VERY slow, but has
140 no lookup table. This is provided as a debugging option.
141
142 Only choose this option if you are debugging crc32.
143
144endchoice
145
Jan Nikitenkoad241522007-07-17 04:04:03 -0700146config CRC7
147 tristate "CRC7 functions"
148 help
149 This option is provided for the case where no in-kernel-tree
150 modules require CRC7 functions, but a module built outside
151 the kernel tree does. Such modules that use library CRC7
152 functions require M here.
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154config LIBCRC32C
155 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
Herbert Xu93027352008-11-13 22:05:13 +0800156 select CRYPTO
Herbert Xu69c35ef2008-11-07 15:11:47 +0800157 select CRYPTO_CRC32C
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 help
159 This option is provided for the case where no in-kernel-tree
160 modules require CRC32c functions, but a module built outside the
161 kernel tree does. Such modules that use library CRC32c functions
162 require M here. See Castagnoli93.
163 Module will be libcrc32c.
164
Arend van Spriel71509622011-05-31 11:22:15 +0200165config CRC8
166 tristate "CRC8 function"
167 help
168 This option provides CRC8 function. Drivers may select this
169 when they need to do cyclic redundancy check according CRC8
170 algorithm. Module will be called crc8.
171
Al Viroe65e1fc2006-09-12 03:04:40 -0400172config AUDIT_GENERIC
173 bool
174 depends on AUDIT && !AUDIT_ARCH
175 default y
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177#
178# compression support is select'ed if needed
179#
180config ZLIB_INFLATE
181 tristate
182
183config ZLIB_DEFLATE
184 tristate
185
Richard Purdie64c70b12007-07-10 17:22:24 -0700186config LZO_COMPRESS
187 tristate
188
189config LZO_DECOMPRESS
190 tristate
191
Lasse Collin24fa0402011-01-12 17:01:22 -0800192source "lib/xz/Kconfig"
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194#
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800195# These all provide a common interface (hence the apparent duplication with
196# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
197#
198config DECOMPRESS_GZIP
H. Peter Anvin7856a16e2009-01-07 00:01:43 -0800199 select ZLIB_INFLATE
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800200 tristate
201
202config DECOMPRESS_BZIP2
203 tristate
204
205config DECOMPRESS_LZMA
206 tristate
207
Lasse Collin3ebe1242011-01-12 17:01:23 -0800208config DECOMPRESS_XZ
209 select XZ_DEC
210 tristate
211
Albin Tonnerrecacb2462010-01-08 14:42:46 -0800212config DECOMPRESS_LZO
213 select LZO_DECOMPRESS
214 tristate
215
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800216#
Jes Sorensenf14f75b2005-06-21 17:15:02 -0700217# Generic allocator support is selected if needed
218#
219config GENERIC_ALLOCATOR
220 boolean
221
222#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223# reed solomon support is select'ed if needed
224#
225config REED_SOLOMON
226 tristate
227
228config REED_SOLOMON_ENC8
229 boolean
230
231config REED_SOLOMON_DEC8
232 boolean
233
234config REED_SOLOMON_ENC16
235 boolean
236
237config REED_SOLOMON_DEC16
238 boolean
239
David S. Millerf7704342005-06-24 17:39:03 -0700240#
Ivan Djelic437aa562011-03-11 11:05:32 +0100241# BCH support is selected if needed
242#
243config BCH
244 tristate
245
246config BCH_CONST_PARAMS
247 boolean
248 help
249 Drivers may select this option to force specific constant
250 values for parameters 'm' (Galois field order) and 't'
251 (error correction capability). Those specific values must
252 be set by declaring default values for symbols BCH_CONST_M
253 and BCH_CONST_T.
254 Doing so will enable extra compiler optimizations,
255 improving encoding and decoding performance up to 2x for
256 usual (m,t) values (typically such that m*t < 200).
257 When this option is selected, the BCH library supports
258 only a single (m,t) configuration. This is mainly useful
259 for NAND flash board drivers requiring known, fixed BCH
260 parameters.
261
262config BCH_CONST_M
263 int
264 range 5 15
265 help
266 Constant value for Galois field order 'm'. If 'k' is the
267 number of data bits to protect, 'm' should be chosen such
268 that (k + m*t) <= 2**m - 1.
269 Drivers should declare a default value for this symbol if
270 they select option BCH_CONST_PARAMS.
271
272config BCH_CONST_T
273 int
274 help
275 Constant value for error correction capability in bits 't'.
276 Drivers should declare a default value for this symbol if
277 they select option BCH_CONST_PARAMS.
278
279#
David S. Millerf7704342005-06-24 17:39:03 -0700280# Textsearch support is select'ed if needed
281#
Thomas Graf2de4ff72005-06-23 20:49:30 -0700282config TEXTSEARCH
David S. Millerf7704342005-06-24 17:39:03 -0700283 boolean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Thomas Grafdf3fb932005-06-23 20:58:37 -0700285config TEXTSEARCH_KMP
David S. Millerf7704342005-06-24 17:39:03 -0700286 tristate
Thomas Grafdf3fb932005-06-23 20:58:37 -0700287
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700288config TEXTSEARCH_BM
David S. Miller29cb9f92005-08-25 16:23:11 -0700289 tristate
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700290
Thomas Graf6408f792005-06-23 20:59:16 -0700291config TEXTSEARCH_FSM
David S. Millerf7704342005-06-24 17:39:03 -0700292 tristate
Thomas Graf6408f792005-06-23 20:59:16 -0700293
Joern Engel5db53f32009-11-20 20:13:39 +0100294config BTREE
295 boolean
296
Al Viro5ea81762007-02-11 15:41:31 +0000297config HAS_IOMEM
Al Viroee36c2b2006-12-13 00:35:00 -0800298 boolean
Al Viro5ea81762007-02-11 15:41:31 +0000299 depends on !NO_IOMEM
Richard Weinberger087fafd2012-02-07 01:22:46 +0100300 select GENERIC_IO
Al Viro5ea81762007-02-11 15:41:31 +0000301 default y
302
303config HAS_IOPORT
304 boolean
305 depends on HAS_IOMEM && !NO_IOPORT
Al Viroee36c2b2006-12-13 00:35:00 -0800306 default y
307
Heiko Carstens411f0f32007-05-06 14:49:09 -0700308config HAS_DMA
309 boolean
310 depends on !NO_DMA
311 default y
312
Geert Uytterhoeven928923c2007-08-22 14:01:36 -0700313config CHECK_SIGNATURE
314 bool
315
Rusty Russellaab46da2008-12-13 21:20:27 +1030316config CPUMASK_OFFSTACK
317 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
318 help
319 Use dynamic allocation for cpumask_var_t, instead of putting
320 them on the stack. This is a bit more expensive, but avoids
321 stack overflow.
322
Rusty Russell8c384cd2009-01-01 10:12:30 +1030323config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
324 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
Kees Cook525c1f92013-01-16 18:54:16 -0800325 depends on BROKEN
Rusty Russell8c384cd2009-01-01 10:12:30 +1030326
Ben Hutchingsc39649c2011-01-19 11:03:25 +0000327config CPU_RMAP
328 bool
329 depends on SMP
330
Tom Herbert75957ba2011-11-28 16:32:35 +0000331config DQL
332 bool
333
Geert Uytterhoevene9cc8bd2009-03-04 14:53:30 +0800334#
335# Netlink attribute parsing support is select'ed if needed
336#
337config NLATTR
338 bool
339
Paul Mackerras09d4e0e2009-06-12 21:10:05 +0000340#
341# Generic 64-bit atomic support is selected if needed
342#
343config GENERIC_ATOMIC64
344 bool
345
Catalin Marinas74634492012-07-30 14:41:09 -0700346config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
347 def_bool y if GENERIC_ATOMIC64
348
Philipp Reisnerb411b362009-09-25 16:07:19 -0700349config LRU_CACHE
350 tristate
351
Bruno Randolfc5485a72010-11-16 10:58:37 +0900352config AVERAGE
Michael Buescha7a9a242011-03-01 20:03:05 +0100353 bool "Averaging functions"
354 help
355 This option is provided for the case where no in-kernel-tree
356 modules require averaging functions, but a module built outside
357 the kernel tree does. Such modules that use library averaging
358 functions require Y here.
359
360 If unsure, say N.
Bruno Randolfc5485a72010-11-16 10:58:37 +0900361
David Millerc6df4b12012-02-02 00:17:54 +0200362config CLZ_TAB
363 bool
364
Arend van Spriel10f81132011-05-31 11:22:16 +0200365config CORDIC
Michael Wittend89ce932011-07-29 12:59:51 +0000366 tristate "CORDIC algorithm"
Arend van Spriel10f81132011-05-31 11:22:16 +0200367 help
Michael Witten435a95c2011-07-29 13:36:04 +0000368 This option provides an implementation of the CORDIC algorithm;
369 calculations are in fixed point. Module will be called cordic.
Arend van Spriel10f81132011-05-31 11:22:16 +0200370
Aneesh V9c1c21a2012-04-27 17:54:03 +0530371config DDR
372 bool "JEDEC DDR data"
373 help
374 Data from JEDEC specs for DDR SDRAM memories,
375 particularly the AC timing parameters and addressing
376 information. This data is useful for drivers handling
377 DDR SDRAM controllers.
378
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300379config MPILIB
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200380 tristate
David Millerc6df4b12012-02-02 00:17:54 +0200381 select CLZ_TAB
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300382 help
383 Multiprecision maths library from GnuPG.
384 It is used to implement RSA digital signature verification,
385 which is used by IMA/EVM digital signature extension.
386
Dmitry Kasatkin5e8898e2012-01-17 17:12:03 +0200387config SIGNATURE
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200388 tristate
Dmitry Kasatkinbe440ec2012-01-17 17:12:04 +0200389 depends on KEYS && CRYPTO
390 select CRYPTO_SHA1
Dmitry Kasatkin051dbb92011-10-14 15:25:16 +0300391 select MPILIB
392 help
393 Digital signature verification. Currently only RSA is supported.
394 Implementation is done using GnuPG MPI library
395
David Daneyab253832012-07-05 18:12:38 +0200396#
397# libfdt files, only selected if needed.
398#
399config LIBFDT
400 bool
401
David Howellsa77ad6e2012-09-21 23:30:46 +0100402config OID_REGISTRY
403 tristate
404 help
405 Enable fast lookup object identifier registry.
406
Thomas Graf2de4ff72005-06-23 20:49:30 -0700407endmenu