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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
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 Torvalds72d93102014-09-13 11:14:53 -070054config ARCH_HAS_FAST_MULTIPLIER
55 bool
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057config CRC_CCITT
58 tristate "CRC-CCITT functions"
59 help
60 This option is provided for the case where no in-kernel-tree
61 modules require CRC-CCITT functions, but a module built outside
62 the kernel tree does. Such modules that use library CRC-CCITT
63 functions require M here.
64
Evgeniy Polyakov7657ec12005-08-17 15:17:26 +040065config CRC16
66 tristate "CRC16 functions"
67 help
68 This option is provided for the case where no in-kernel-tree
69 modules require CRC16 functions, but a module built outside
70 the kernel tree does. Such modules that use library CRC16
71 functions require M here.
72
Martin K. Petersenf11f5942008-06-25 11:22:42 -040073config CRC_T10DIF
74 tristate "CRC calculation for the T10 Data Integrity Field"
Herbert Xu684115212013-09-07 12:56:26 +100075 select CRYPTO
76 select CRYPTO_CRCT10DIF
Martin K. Petersenf11f5942008-06-25 11:22:42 -040077 help
78 This option is only needed if a module that's not in the
79 kernel tree needs to calculate CRC checks for use with the
80 SCSI data integrity subsystem.
81
Ivo van Doorn3e7cbae2006-06-12 16:17:04 +020082config CRC_ITU_T
83 tristate "CRC ITU-T V.41 functions"
84 help
85 This option is provided for the case where no in-kernel-tree
86 modules require CRC ITU-T V.41 functions, but a module built outside
87 the kernel tree does. Such modules that use library CRC ITU-T V.41
88 functions require M here.
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090config CRC32
Darrick J. Wong46c58012012-03-23 15:02:25 -070091 tristate "CRC32/CRC32c functions"
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 default y
Akinobu Mita906d66d2006-12-08 02:36:25 -080093 select BITREVERSE
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 help
95 This option is provided for the case where no in-kernel-tree
Darrick J. Wong46c58012012-03-23 15:02:25 -070096 modules require CRC32/CRC32c functions, but a module built outside
97 the kernel tree does. Such modules that use library CRC32/CRC32c
98 functions require M here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Bob Pearson3863ef32012-03-23 15:02:22 -0700100config CRC32_SELFTEST
101 bool "CRC32 perform self test on init"
102 default n
103 depends on CRC32
104 help
105 This option enables the CRC32 library functions to perform a
106 self test on initialization. The self test computes crc32_le
107 and crc32_be over byte strings with random alignment and length
108 and computes the total elapsed time and number of bytes processed.
109
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700110choice
111 prompt "CRC32 implementation"
112 depends on CRC32
113 default CRC32_SLICEBY8
Darrick J. Wong82edb4b2012-03-28 14:42:56 -0700114 help
115 This option allows a kernel builder to override the default choice
116 of CRC32 algorithm. Choose the default ("slice by 8") unless you
117 know that you need one of the others.
Darrick J. Wong5cde7652012-03-23 15:02:26 -0700118
119config CRC32_SLICEBY8
120 bool "Slice by 8 bytes"
121 help
122 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
123 This is the fastest algorithm, but comes with a 8KiB lookup table.
124 Most modern processors have enough cache to hold this table without
125 thrashing the cache.
126
127 This is the default implementation choice. Choose this one unless
128 you have a good reason not to.
129
130config CRC32_SLICEBY4
131 bool "Slice by 4 bytes"
132 help
133 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
134 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
135 table.
136
137 Only choose this option if you know what you are doing.
138
139config CRC32_SARWATE
140 bool "Sarwate's Algorithm (one byte at a time)"
141 help
142 Calculate checksum a byte at a time using Sarwate's algorithm. This
143 is not particularly fast, but has a small 256 byte lookup table.
144
145 Only choose this option if you know what you are doing.
146
147config CRC32_BIT
148 bool "Classic Algorithm (one bit at a time)"
149 help
150 Calculate checksum one bit at a time. This is VERY slow, but has
151 no lookup table. This is provided as a debugging option.
152
153 Only choose this option if you are debugging crc32.
154
155endchoice
156
Jan Nikitenkoad241522007-07-17 04:04:03 -0700157config CRC7
158 tristate "CRC7 functions"
159 help
160 This option is provided for the case where no in-kernel-tree
161 modules require CRC7 functions, but a module built outside
162 the kernel tree does. Such modules that use library CRC7
163 functions require M here.
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165config LIBCRC32C
166 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
Herbert Xu93027352008-11-13 22:05:13 +0800167 select CRYPTO
Herbert Xu69c35ef2008-11-07 15:11:47 +0800168 select CRYPTO_CRC32C
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 help
170 This option is provided for the case where no in-kernel-tree
171 modules require CRC32c functions, but a module built outside the
172 kernel tree does. Such modules that use library CRC32c functions
173 require M here. See Castagnoli93.
174 Module will be libcrc32c.
175
Arend van Spriel71509622011-05-31 11:22:15 +0200176config CRC8
177 tristate "CRC8 function"
178 help
179 This option provides CRC8 function. Drivers may select this
180 when they need to do cyclic redundancy check according CRC8
181 algorithm. Module will be called crc8.
182
Al Viroe65e1fc2006-09-12 03:04:40 -0400183config AUDIT_GENERIC
184 bool
185 depends on AUDIT && !AUDIT_ARCH
186 default y
187
AKASHI Takahiro4b588412014-03-15 14:48:00 +0900188config AUDIT_ARCH_COMPAT_GENERIC
189 bool
190 default n
191
192config AUDIT_COMPAT_GENERIC
193 bool
194 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
195 default y
196
Daniel Borkmanna6a9c0f2013-11-11 12:20:37 +0100197config RANDOM32_SELFTEST
198 bool "PRNG perform self test on init"
199 default n
200 help
201 This option enables the 32 bit PRNG library functions to perform a
202 self test on initialization.
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204#
205# compression support is select'ed if needed
206#
207config ZLIB_INFLATE
208 tristate
209
210config ZLIB_DEFLATE
211 tristate
212
Richard Purdie64c70b12007-07-10 17:22:24 -0700213config LZO_COMPRESS
214 tristate
215
216config LZO_DECOMPRESS
217 tristate
218
Chanho Minc72ac7a2013-07-08 16:01:49 -0700219config LZ4_COMPRESS
220 tristate
221
222config LZ4HC_COMPRESS
223 tristate
224
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700225config LZ4_DECOMPRESS
226 tristate
227
Lasse Collin24fa0402011-01-12 17:01:22 -0800228source "lib/xz/Kconfig"
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230#
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800231# These all provide a common interface (hence the apparent duplication with
232# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
233#
234config DECOMPRESS_GZIP
H. Peter Anvin7856a16e2009-01-07 00:01:43 -0800235 select ZLIB_INFLATE
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800236 tristate
237
238config DECOMPRESS_BZIP2
239 tristate
240
241config DECOMPRESS_LZMA
242 tristate
243
Lasse Collin3ebe1242011-01-12 17:01:23 -0800244config DECOMPRESS_XZ
245 select XZ_DEC
246 tristate
247
Albin Tonnerrecacb2462010-01-08 14:42:46 -0800248config DECOMPRESS_LZO
249 select LZO_DECOMPRESS
250 tristate
251
Kyungsik Leee76e1fd2013-07-08 16:01:46 -0700252config DECOMPRESS_LZ4
253 select LZ4_DECOMPRESS
254 tristate
255
H. Peter Anvinc8531ab2009-01-05 13:48:31 -0800256#
Jes Sorensenf14f75b2005-06-21 17:15:02 -0700257# Generic allocator support is selected if needed
258#
259config GENERIC_ALLOCATOR
260 boolean
261
262#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263# reed solomon support is select'ed if needed
264#
265config REED_SOLOMON
266 tristate
267
268config REED_SOLOMON_ENC8
269 boolean
270
271config REED_SOLOMON_DEC8
272 boolean
273
274config REED_SOLOMON_ENC16
275 boolean
276
277config REED_SOLOMON_DEC16
278 boolean
279
David S. Millerf7704342005-06-24 17:39:03 -0700280#
Ivan Djelic437aa562011-03-11 11:05:32 +0100281# BCH support is selected if needed
282#
283config BCH
284 tristate
285
286config BCH_CONST_PARAMS
287 boolean
288 help
289 Drivers may select this option to force specific constant
290 values for parameters 'm' (Galois field order) and 't'
291 (error correction capability). Those specific values must
292 be set by declaring default values for symbols BCH_CONST_M
293 and BCH_CONST_T.
294 Doing so will enable extra compiler optimizations,
295 improving encoding and decoding performance up to 2x for
296 usual (m,t) values (typically such that m*t < 200).
297 When this option is selected, the BCH library supports
298 only a single (m,t) configuration. This is mainly useful
299 for NAND flash board drivers requiring known, fixed BCH
300 parameters.
301
302config BCH_CONST_M
303 int
304 range 5 15
305 help
306 Constant value for Galois field order 'm'. If 'k' is the
307 number of data bits to protect, 'm' should be chosen such
308 that (k + m*t) <= 2**m - 1.
309 Drivers should declare a default value for this symbol if
310 they select option BCH_CONST_PARAMS.
311
312config BCH_CONST_T
313 int
314 help
315 Constant value for error correction capability in bits 't'.
316 Drivers should declare a default value for this symbol if
317 they select option BCH_CONST_PARAMS.
318
319#
David S. Millerf7704342005-06-24 17:39:03 -0700320# Textsearch support is select'ed if needed
321#
Thomas Graf2de4ff72005-06-23 20:49:30 -0700322config TEXTSEARCH
David S. Millerf7704342005-06-24 17:39:03 -0700323 boolean
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Thomas Grafdf3fb932005-06-23 20:58:37 -0700325config TEXTSEARCH_KMP
David S. Millerf7704342005-06-24 17:39:03 -0700326 tristate
Thomas Grafdf3fb932005-06-23 20:58:37 -0700327
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700328config TEXTSEARCH_BM
David S. Miller29cb9f92005-08-25 16:23:11 -0700329 tristate
Pablo Neira Ayuso8082e4e2005-08-25 16:12:22 -0700330
Thomas Graf6408f792005-06-23 20:59:16 -0700331config TEXTSEARCH_FSM
David S. Millerf7704342005-06-24 17:39:03 -0700332 tristate
Thomas Graf6408f792005-06-23 20:59:16 -0700333
Joern Engel5db53f32009-11-20 20:13:39 +0100334config BTREE
335 boolean
336
Chris Wilsona88cc102014-03-17 12:21:54 +0000337config INTERVAL_TREE
338 boolean
339 help
340 Simple, embeddable, interval-tree. Can find the start of an
341 overlapping range in log(n) time and then iterate over all
342 overlapping nodes. The algorithm is implemented as an
343 augmented rbtree.
344
345 See:
346
347 Documentation/rbtree.txt
348
349 for more information.
350
David Howells3cb98952013-09-24 10:35:17 +0100351config ASSOCIATIVE_ARRAY
352 bool
353 help
354 Generic associative array. Can be searched and iterated over whilst
355 it is being modified. It is also reasonably quick to search and
356 modify. The algorithms are non-recursive, and the trees are highly
357 capacious.
358
359 See:
360
361 Documentation/assoc_array.txt
362
363 for more information.
364
Al Viro5ea81762007-02-11 15:41:31 +0000365config HAS_IOMEM
Al Viroee36c2b2006-12-13 00:35:00 -0800366 boolean
Al Viro5ea81762007-02-11 15:41:31 +0000367 depends on !NO_IOMEM
Richard Weinberger087fafd2012-02-07 01:22:46 +0100368 select GENERIC_IO
Al Viro5ea81762007-02-11 15:41:31 +0000369 default y
370
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700371config HAS_IOPORT_MAP
Al Viro5ea81762007-02-11 15:41:31 +0000372 boolean
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700373 depends on HAS_IOMEM && !NO_IOPORT_MAP
Al Viroee36c2b2006-12-13 00:35:00 -0800374 default y
375
Heiko Carstens411f0f32007-05-06 14:49:09 -0700376config HAS_DMA
377 boolean
378 depends on !NO_DMA
379 default y
380
Geert Uytterhoeven928923c2007-08-22 14:01:36 -0700381config CHECK_SIGNATURE
382 bool
383
Rusty Russellaab46da2008-12-13 21:20:27 +1030384config CPUMASK_OFFSTACK
385 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
386 help
387 Use dynamic allocation for cpumask_var_t, instead of putting
388 them on the stack. This is a bit more expensive, but avoids
389 stack overflow.
390
Rusty Russell8c384cd2009-01-01 10:12:30 +1030391config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
392 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
Kees Cook525c1f92013-01-16 18:54:16 -0800393 depends on BROKEN
Rusty Russell8c384cd2009-01-01 10:12:30 +1030394
Ben Hutchingsc39649c2011-01-19 11:03:25 +0000395config CPU_RMAP
396 bool
397 depends on SMP
398
Tom Herbert75957ba2011-11-28 16:32:35 +0000399config DQL
400 bool
401
George Spelvinb0125082014-08-06 16:09:23 -0700402config GLOB
403 bool
404# This actually supports modular compilation, but the module overhead
405# is ridiculous for the amount of code involved. Until an out-of-tree
406# driver asks for it, we'll just link it directly it into the kernel
407# when required. Since we're ignoring out-of-tree users, there's also
408# no need bother prompting for a manual decision:
409# prompt "glob_match() function"
410 help
411 This option provides a glob_match function for performing
412 simple text pattern matching. It originated in the ATA code
413 to blacklist particular drive models, but other device drivers
414 may need similar functionality.
415
416 All drivers in the Linux kernel tree that require this function
417 should automatically select this option. Say N unless you
418 are compiling an out-of tree driver which tells you that it
419 depends on this.
420
George Spelvin5f9be822014-08-06 16:09:25 -0700421config GLOB_SELFTEST
422 bool "glob self-test on init"
423 default n
424 depends on GLOB
425 help
426 This option enables a simple self-test of the glob_match
427 function on startup. It is primarily useful for people
428 working on the code to ensure they haven't introduced any
429 regressions.
430
431 It only adds a little bit of code and slows kernel boot (or
432 module load) by a small amount, so you're welcome to play with
433 it, but you probably don't need it.
434
Geert Uytterhoevene9cc8bd2009-03-04 14:53:30 +0800435#
436# Netlink attribute parsing support is select'ed if needed
437#
438config NLATTR
439 bool
440
Paul Mackerras09d4e0e2009-06-12 21:10:05 +0000441#
442# Generic 64-bit atomic support is selected if needed
443#
444config GENERIC_ATOMIC64
445 bool
446
Catalin Marinas74634492012-07-30 14:41:09 -0700447config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
448 def_bool y if GENERIC_ATOMIC64
449
Philipp Reisnerb411b362009-09-25 16:07:19 -0700450config LRU_CACHE
451 tristate
452
Bruno Randolfc5485a72010-11-16 10:58:37 +0900453config AVERAGE
Michael Buescha7a9a242011-03-01 20:03:05 +0100454 bool "Averaging functions"
455 help
456 This option is provided for the case where no in-kernel-tree
457 modules require averaging functions, but a module built outside
458 the kernel tree does. Such modules that use library averaging
459 functions require Y here.
460
461 If unsure, say N.
Bruno Randolfc5485a72010-11-16 10:58:37 +0900462
David Millerc6df4b12012-02-02 00:17:54 +0200463config CLZ_TAB
464 bool
465
Arend van Spriel10f81132011-05-31 11:22:16 +0200466config CORDIC
Michael Wittend89ce932011-07-29 12:59:51 +0000467 tristate "CORDIC algorithm"
Arend van Spriel10f81132011-05-31 11:22:16 +0200468 help
Michael Witten435a95c2011-07-29 13:36:04 +0000469 This option provides an implementation of the CORDIC algorithm;
470 calculations are in fixed point. Module will be called cordic.
Arend van Spriel10f81132011-05-31 11:22:16 +0200471
Aneesh V9c1c21a2012-04-27 17:54:03 +0530472config DDR
473 bool "JEDEC DDR data"
474 help
475 Data from JEDEC specs for DDR SDRAM memories,
476 particularly the AC timing parameters and addressing
477 information. This data is useful for drivers handling
478 DDR SDRAM controllers.
479
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300480config MPILIB
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200481 tristate
David Millerc6df4b12012-02-02 00:17:54 +0200482 select CLZ_TAB
Dmitry Kasatkind9c46b12011-08-31 14:05:16 +0300483 help
484 Multiprecision maths library from GnuPG.
485 It is used to implement RSA digital signature verification,
486 which is used by IMA/EVM digital signature extension.
487
Dmitry Kasatkin5e8898e2012-01-17 17:12:03 +0200488config SIGNATURE
Dmitry Kasatkin2e5f0942012-01-17 17:12:06 +0200489 tristate
Dmitry Kasatkin0d1f64f2014-07-11 18:59:45 +0300490 depends on KEYS
491 select CRYPTO
Dmitry Kasatkinbe440ec2012-01-17 17:12:04 +0200492 select CRYPTO_SHA1
Dmitry Kasatkin051dbb92011-10-14 15:25:16 +0300493 select MPILIB
494 help
495 Digital signature verification. Currently only RSA is supported.
496 Implementation is done using GnuPG MPI library
497
David Daneyab253832012-07-05 18:12:38 +0200498#
499# libfdt files, only selected if needed.
500#
501config LIBFDT
502 bool
503
David Howellsa77ad6e2012-09-21 23:30:46 +0100504config OID_REGISTRY
505 tristate
506 help
507 Enable fast lookup object identifier registry.
508
Matthew Garrett0635eb82013-04-15 13:09:45 -0700509config UCS2_STRING
510 tristate
511
Geert Uytterhoevenee89bd62013-06-09 11:46:43 +0200512source "lib/fonts/Kconfig"
513
Laura Abbott308c09f2014-08-08 14:23:25 -0700514#
515# sg chaining option
516#
517
518config ARCH_HAS_SG_CHAIN
519 def_bool n
520
Thomas Graf2de4ff72005-06-23 20:49:30 -0700521endmenu