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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070054config 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
Evgeniy Polyakov7657ec12005-08-17 15:17:26 +040062config 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
Martin K. Petersenf11f5942008-06-25 11:22:42 -040070config CRC_T10DIF
71 tristate "CRC calculation for the T10 Data Integrity Field"
Herbert Xu684115212013-09-07 12:56:26 +100072 select CRYPTO
73 select CRYPTO_CRCT10DIF
Martin K. Petersenf11f5942008-06-25 11:22:42 -040074 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
Ivo van Doorn3e7cbae2006-06-12 16:17:04 +020079config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070087config CRC32
Darrick J. Wong46c58012012-03-23 15:02:25 -070088 tristate "CRC32/CRC32c functions"
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 default y
Akinobu Mita906d66d2006-12-08 02:36:25 -080090 select BITREVERSE
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 help
92 This option is provided for the case where no in-kernel-tree
Darrick J. Wong46c58012012-03-23 15:02:25 -070093 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Bob Pearson3863ef32012-03-23 15:02:22 -070097config 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
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700107choice
108 prompt "CRC32 implementation"
109 depends on CRC32
110 default CRC32_SLICEBY8
Darrick J. Wong82edb4b2012-03-28 14:42:56 -0700111 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.
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700115
116config 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
127config 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
136config 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
144config 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
152endchoice
153
Jan Nikitenkoad241522007-07-17 04:04:03 -0700154config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162config LIBCRC32C
163 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
Herbert Xu93027352008-11-13 22:05:13 +0800164 select CRYPTO
Herbert Xu69c35ef2008-11-07 15:11:47 +0800165 select CRYPTO_CRC32C
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 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
Arend van Spriel71509622011-05-31 11:22:15 +0200173config 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
Al Viroe65e1fc2006-09-12 03:04:40 -0400180config AUDIT_GENERIC
181 bool
182 depends on AUDIT && !AUDIT_ARCH
183 default y
184
AKASHI Takahiro4b588412014-03-15 14:48:00 +0900185config AUDIT_ARCH_COMPAT_GENERIC
186 bool
187 default n
188
189config AUDIT_COMPAT_GENERIC
190 bool
191 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
192 default y
193
Daniel Borkmanna6a9c0f2013-11-11 12:20:37 +0100194config 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201#
202# compression support is select'ed if needed
203#
204config ZLIB_INFLATE
205 tristate
206
207config ZLIB_DEFLATE
208 tristate
209
Richard Purdie64c70b12007-07-10 17:22:24 -0700210config LZO_COMPRESS
211 tristate
212
213config LZO_DECOMPRESS
214 tristate
215
Chanho Minc72ac7a2013-07-08 16:01:49 -0700216config LZ4_COMPRESS
217 tristate
218
219config LZ4HC_COMPRESS
220 tristate
221
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700222config LZ4_DECOMPRESS
223 tristate
224
Lasse Collin24fa0402011-01-12 17:01:22 -0800225source "lib/xz/Kconfig"
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227#
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800228# These all provide a common interface (hence the apparent duplication with
229# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
230#
231config DECOMPRESS_GZIP
H. Peter Anvin7856a16e2009-01-07 00:01:43 -0800232 select ZLIB_INFLATE
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800233 tristate
234
235config DECOMPRESS_BZIP2
236 tristate
237
238config DECOMPRESS_LZMA
239 tristate
240
Lasse Collin3ebe1242011-01-12 17:01:23 -0800241config DECOMPRESS_XZ
242 select XZ_DEC
243 tristate
244
Albin Tonnerrecacb2462010-01-08 14:42:46 -0800245config DECOMPRESS_LZO
246 select LZO_DECOMPRESS
247 tristate
248
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700249config DECOMPRESS_LZ4
250 select LZ4_DECOMPRESS
251 tristate
252
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800253#
Jes Sorensenf14f75b2005-06-21 17:15:02 -0700254# Generic allocator support is selected if needed
255#
256config GENERIC_ALLOCATOR
257 boolean
258
259#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260# reed solomon support is select'ed if needed
261#
262config REED_SOLOMON
263 tristate
264
265config REED_SOLOMON_ENC8
266 boolean
267
268config REED_SOLOMON_DEC8
269 boolean
270
271config REED_SOLOMON_ENC16
272 boolean
273
274config REED_SOLOMON_DEC16
275 boolean
276
David S. Millerf7704342005-06-24 17:39:03 -0700277#
Ivan Djelic437aa562011-03-11 11:05:32 +0100278# BCH support is selected if needed
279#
280config BCH
281 tristate
282
283config 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
299config 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
309config 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#
David S. Millerf7704342005-06-24 17:39:03 -0700317# Textsearch support is select'ed if needed
318#
Thomas Graf2de4ff72005-06-23 20:49:30 -0700319config TEXTSEARCH
David S. Millerf7704342005-06-24 17:39:03 -0700320 boolean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
Thomas Grafdf3fb932005-06-23 20:58:37 -0700322config TEXTSEARCH_KMP
David S. Millerf7704342005-06-24 17:39:03 -0700323 tristate
Thomas Grafdf3fb932005-06-23 20:58:37 -0700324
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700325config TEXTSEARCH_BM
David S. Miller29cb9f92005-08-25 16:23:11 -0700326 tristate
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700327
Thomas Graf6408f792005-06-23 20:59:16 -0700328config TEXTSEARCH_FSM
David S. Millerf7704342005-06-24 17:39:03 -0700329 tristate
Thomas Graf6408f792005-06-23 20:59:16 -0700330
Joern Engel5db53f32009-11-20 20:13:39 +0100331config BTREE
332 boolean
333
Chris Wilsona88cc102014-03-17 12:21:54 +0000334config 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
David Howells3cb98952013-09-24 10:35:17 +0100348config 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
Al Viro5ea81762007-02-11 15:41:31 +0000362config HAS_IOMEM
Al Viroee36c2b2006-12-13 00:35:00 -0800363 boolean
Al Viro5ea81762007-02-11 15:41:31 +0000364 depends on !NO_IOMEM
Richard Weinberger087fafd2012-02-07 01:22:46 +0100365 select GENERIC_IO
Al Viro5ea81762007-02-11 15:41:31 +0000366 default y
367
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700368config HAS_IOPORT_MAP
Al Viro5ea81762007-02-11 15:41:31 +0000369 boolean
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700370 depends on HAS_IOMEM && !NO_IOPORT_MAP
Al Viroee36c2b2006-12-13 00:35:00 -0800371 default y
372
Heiko Carstens411f0f32007-05-06 14:49:09 -0700373config HAS_DMA
374 boolean
375 depends on !NO_DMA
376 default y
377
Geert Uytterhoeven928923c2007-08-22 14:01:36 -0700378config CHECK_SIGNATURE
379 bool
380
Rusty Russellaab46da2008-12-13 21:20:27 +1030381config 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
Rusty Russell8c384cd2009-01-01 10:12:30 +1030388config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
389 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
Kees Cook525c1f92013-01-16 18:54:16 -0800390 depends on BROKEN
Rusty Russell8c384cd2009-01-01 10:12:30 +1030391
Ben Hutchingsc39649c2011-01-19 11:03:25 +0000392config CPU_RMAP
393 bool
394 depends on SMP
395
Tom Herbert75957ba2011-11-28 16:32:35 +0000396config DQL
397 bool
398
George Spelvinb0125082014-08-06 16:09:23 -0700399config GLOB
400 bool
401# This actually supports modular compilation, but the module overhead
402# is ridiculous for the amount of code involved. Until an out-of-tree
403# driver asks for it, we'll just link it directly it into the kernel
404# when required. Since we're ignoring out-of-tree users, there's also
405# no need bother prompting for a manual decision:
406# prompt "glob_match() function"
407 help
408 This option provides a glob_match function for performing
409 simple text pattern matching. It originated in the ATA code
410 to blacklist particular drive models, but other device drivers
411 may need similar functionality.
412
413 All drivers in the Linux kernel tree that require this function
414 should automatically select this option. Say N unless you
415 are compiling an out-of tree driver which tells you that it
416 depends on this.
417
George Spelvin5f9be822014-08-06 16:09:25 -0700418config GLOB_SELFTEST
419 bool "glob self-test on init"
420 default n
421 depends on GLOB
422 help
423 This option enables a simple self-test of the glob_match
424 function on startup. It is primarily useful for people
425 working on the code to ensure they haven't introduced any
426 regressions.
427
428 It only adds a little bit of code and slows kernel boot (or
429 module load) by a small amount, so you're welcome to play with
430 it, but you probably don't need it.
431
Geert Uytterhoevene9cc8bd2009-03-04 14:53:30 +0800432#
433# Netlink attribute parsing support is select'ed if needed
434#
435config NLATTR
436 bool
437
Paul Mackerras09d4e0e2009-06-12 21:10:05 +0000438#
439# Generic 64-bit atomic support is selected if needed
440#
441config GENERIC_ATOMIC64
442 bool
443
Catalin Marinas74634492012-07-30 14:41:09 -0700444config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
445 def_bool y if GENERIC_ATOMIC64
446
Philipp Reisnerb411b362009-09-25 16:07:19 -0700447config LRU_CACHE
448 tristate
449
Bruno Randolfc5485a72010-11-16 10:58:37 +0900450config AVERAGE
Michael Buescha7a9a242011-03-01 20:03:05 +0100451 bool "Averaging functions"
452 help
453 This option is provided for the case where no in-kernel-tree
454 modules require averaging functions, but a module built outside
455 the kernel tree does. Such modules that use library averaging
456 functions require Y here.
457
458 If unsure, say N.
Bruno Randolfc5485a72010-11-16 10:58:37 +0900459
David Millerc6df4b12012-02-02 00:17:54 +0200460config CLZ_TAB
461 bool
462
Arend van Spriel10f81132011-05-31 11:22:16 +0200463config CORDIC
Michael Wittend89ce932011-07-29 12:59:51 +0000464 tristate "CORDIC algorithm"
Arend van Spriel10f81132011-05-31 11:22:16 +0200465 help
Michael Witten435a95c2011-07-29 13:36:04 +0000466 This option provides an implementation of the CORDIC algorithm;
467 calculations are in fixed point. Module will be called cordic.
Arend van Spriel10f81132011-05-31 11:22:16 +0200468
Aneesh V9c1c21a2012-04-27 17:54:03 +0530469config DDR
470 bool "JEDEC DDR data"
471 help
472 Data from JEDEC specs for DDR SDRAM memories,
473 particularly the AC timing parameters and addressing
474 information. This data is useful for drivers handling
475 DDR SDRAM controllers.
476
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300477config MPILIB
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200478 tristate
David Millerc6df4b12012-02-02 00:17:54 +0200479 select CLZ_TAB
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300480 help
481 Multiprecision maths library from GnuPG.
482 It is used to implement RSA digital signature verification,
483 which is used by IMA/EVM digital signature extension.
484
Dmitry Kasatkin5e8898e2012-01-17 17:12:03 +0200485config SIGNATURE
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200486 tristate
Dmitry Kasatkin0d1f64f2014-07-11 18:59:45 +0300487 depends on KEYS
488 select CRYPTO
Dmitry Kasatkinbe440ec2012-01-17 17:12:04 +0200489 select CRYPTO_SHA1
Dmitry Kasatkin051dbb92011-10-14 15:25:16 +0300490 select MPILIB
491 help
492 Digital signature verification. Currently only RSA is supported.
493 Implementation is done using GnuPG MPI library
494
David Daneyab253832012-07-05 18:12:38 +0200495#
496# libfdt files, only selected if needed.
497#
498config LIBFDT
499 bool
500
David Howellsa77ad6e2012-09-21 23:30:46 +0100501config OID_REGISTRY
502 tristate
503 help
504 Enable fast lookup object identifier registry.
505
Matthew Garrett0635eb82013-04-15 13:09:45 -0700506config UCS2_STRING
507 tristate
508
Geert Uytterhoevenee89bd62013-06-09 11:46:43 +0200509source "lib/fonts/Kconfig"
510
Thomas Graf2de4ff72005-06-23 20:49:30 -0700511endmenu