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1#
2# Library configuration
3#
4
5config BINARY_PRINTF
6 def_bool n
7
8menu "Library routines"
9
10config RAID6_PQ
11 tristate
12
13config BITREVERSE
14 tristate
15
16config RATIONAL
17 boolean
18
19config GENERIC_FIND_FIRST_BIT
20 bool
21
22config CRC_CCITT
23 tristate "CRC-CCITT functions"
24 help
25 This option is provided for the case where no in-kernel-tree
26 modules require CRC-CCITT functions, but a module built outside
27 the kernel tree does. Such modules that use library CRC-CCITT
28 functions require M here.
29
30config CRC16
31 tristate "CRC16 functions"
32 help
33 This option is provided for the case where no in-kernel-tree
34 modules require CRC16 functions, but a module built outside
35 the kernel tree does. Such modules that use library CRC16
36 functions require M here.
37
38config CRC_T10DIF
39 tristate "CRC calculation for the T10 Data Integrity Field"
40 help
41 This option is only needed if a module that's not in the
42 kernel tree needs to calculate CRC checks for use with the
43 SCSI data integrity subsystem.
44
45config CRC_ITU_T
46 tristate "CRC ITU-T V.41 functions"
47 help
48 This option is provided for the case where no in-kernel-tree
49 modules require CRC ITU-T V.41 functions, but a module built outside
50 the kernel tree does. Such modules that use library CRC ITU-T V.41
51 functions require M here.
52
53config CRC32
54 tristate "CRC32 functions"
55 default y
56 select BITREVERSE
57 help
58 This option is provided for the case where no in-kernel-tree
59 modules require CRC32 functions, but a module built outside the
60 kernel tree does. Such modules that use library CRC32 functions
61 require M here.
62
63config CRC7
64 tristate "CRC7 functions"
65 help
66 This option is provided for the case where no in-kernel-tree
67 modules require CRC7 functions, but a module built outside
68 the kernel tree does. Such modules that use library CRC7
69 functions require M here.
70
71config LIBCRC32C
72 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
73 select CRYPTO
74 select CRYPTO_CRC32C
75 help
76 This option is provided for the case where no in-kernel-tree
77 modules require CRC32c functions, but a module built outside the
78 kernel tree does. Such modules that use library CRC32c functions
79 require M here. See Castagnoli93.
80 Module will be libcrc32c.
81
82config CRC8
83 tristate "CRC8 function"
84 help
85 This option provides CRC8 function. Drivers may select this
86 when they need to do cyclic redundancy check according CRC8
87 algorithm. Module will be called crc8.
88
89config AUDIT_GENERIC
90 bool
91 depends on AUDIT && !AUDIT_ARCH
92 default y
93
94#
95# compression support is select'ed if needed
96#
97config ZLIB_INFLATE
98 tristate
99
100config ZLIB_DEFLATE
101 tristate
102
103config LZO_COMPRESS
104 tristate
105
106config LZO_DECOMPRESS
107 tristate
108
109source "lib/xz/Kconfig"
110
111#
112# These all provide a common interface (hence the apparent duplication with
113# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
114#
115config DECOMPRESS_GZIP
116 select ZLIB_INFLATE
117 tristate
118
119config DECOMPRESS_BZIP2
120 tristate
121
122config DECOMPRESS_LZMA
123 tristate
124
125config DECOMPRESS_XZ
126 select XZ_DEC
127 tristate
128
129config DECOMPRESS_LZO
130 select LZO_DECOMPRESS
131 tristate
132
133#
134# Generic allocator support is selected if needed
135#
136config GENERIC_ALLOCATOR
137 boolean
138
139#
140# reed solomon support is select'ed if needed
141#
142config REED_SOLOMON
143 tristate
144
145config REED_SOLOMON_ENC8
146 boolean
147
148config REED_SOLOMON_DEC8
149 boolean
150
151config REED_SOLOMON_ENC16
152 boolean
153
154config REED_SOLOMON_DEC16
155 boolean
156
157#
158# BCH support is selected if needed
159#
160config BCH
161 tristate
162
163config BCH_CONST_PARAMS
164 boolean
165 help
166 Drivers may select this option to force specific constant
167 values for parameters 'm' (Galois field order) and 't'
168 (error correction capability). Those specific values must
169 be set by declaring default values for symbols BCH_CONST_M
170 and BCH_CONST_T.
171 Doing so will enable extra compiler optimizations,
172 improving encoding and decoding performance up to 2x for
173 usual (m,t) values (typically such that m*t < 200).
174 When this option is selected, the BCH library supports
175 only a single (m,t) configuration. This is mainly useful
176 for NAND flash board drivers requiring known, fixed BCH
177 parameters.
178
179config BCH_CONST_M
180 int
181 range 5 15
182 help
183 Constant value for Galois field order 'm'. If 'k' is the
184 number of data bits to protect, 'm' should be chosen such
185 that (k + m*t) <= 2**m - 1.
186 Drivers should declare a default value for this symbol if
187 they select option BCH_CONST_PARAMS.
188
189config BCH_CONST_T
190 int
191 help
192 Constant value for error correction capability in bits 't'.
193 Drivers should declare a default value for this symbol if
194 they select option BCH_CONST_PARAMS.
195
196#
197# Textsearch support is select'ed if needed
198#
199config TEXTSEARCH
200 boolean
201
202config TEXTSEARCH_KMP
203 tristate
204
205config TEXTSEARCH_BM
206 tristate
207
208config TEXTSEARCH_FSM
209 tristate
210
211config BTREE
212 boolean
213
214config HAS_IOMEM
215 boolean
216 depends on !NO_IOMEM
217 default y
218
219config HAS_IOPORT
220 boolean
221 depends on HAS_IOMEM && !NO_IOPORT
222 default y
223
224config HAS_DMA
225 boolean
226 depends on !NO_DMA
227 default y
228
229config CHECK_SIGNATURE
230 bool
231
232config CPUMASK_OFFSTACK
233 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
234 help
235 Use dynamic allocation for cpumask_var_t, instead of putting
236 them on the stack. This is a bit more expensive, but avoids
237 stack overflow.
238
239config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
240 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
241 depends on EXPERIMENTAL && BROKEN
242
243config CPU_RMAP
244 bool
245 depends on SMP
246
247#
248# Netlink attribute parsing support is select'ed if needed
249#
250config NLATTR
251 bool
252
253#
254# Generic 64-bit atomic support is selected if needed
255#
256config GENERIC_ATOMIC64
257 bool
258
259config LRU_CACHE
260 tristate
261
262config AVERAGE
263 bool "Averaging functions"
264 help
265 This option is provided for the case where no in-kernel-tree
266 modules require averaging functions, but a module built outside
267 the kernel tree does. Such modules that use library averaging
268 functions require Y here.
269
270 If unsure, say N.
271
272config CORDIC
273 tristate "Cordic function"
274 help
275 The option provides arithmetic function using cordic algorithm
276 so its calculations are in fixed point. Modules can select this
277 when they require this function. Module will be called cordic.
278
279config LLIST
280 bool
281
282endmenu
1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Library configuration
4#
5
6config BINARY_PRINTF
7 def_bool n
8
9menu "Library routines"
10
11config RAID6_PQ
12 tristate
13
14config RAID6_PQ_BENCHMARK
15 bool "Automatically choose fastest RAID6 PQ functions"
16 depends on RAID6_PQ
17 default y
18 help
19 Benchmark all available RAID6 PQ functions on init and choose the
20 fastest one.
21
22config PACKING
23 bool "Generic bitfield packing and unpacking"
24 default n
25 help
26 This option provides the packing() helper function, which permits
27 converting bitfields between a CPU-usable representation and a
28 memory representation that can have any combination of these quirks:
29 - Is little endian (bytes are reversed within a 32-bit group)
30 - The least-significant 32-bit word comes first (within a 64-bit
31 group)
32 - The most significant bit of a byte is at its right (bit 0 of a
33 register description is numerically 2^7).
34 Drivers may use these helpers to match the bit indices as described
35 in the data sheets of the peripherals they are in control of.
36
37 When in doubt, say N.
38
39config BITREVERSE
40 tristate
41
42config HAVE_ARCH_BITREVERSE
43 bool
44 default n
45 depends on BITREVERSE
46 help
47 This option enables the use of hardware bit-reversal instructions on
48 architectures which support such operations.
49
50config GENERIC_STRNCPY_FROM_USER
51 bool
52
53config GENERIC_STRNLEN_USER
54 bool
55
56config GENERIC_NET_UTILS
57 bool
58
59config GENERIC_FIND_FIRST_BIT
60 bool
61
62source "lib/math/Kconfig"
63
64config NO_GENERIC_PCI_IOPORT_MAP
65 bool
66
67config GENERIC_PCI_IOMAP
68 bool
69
70config GENERIC_IOMAP
71 bool
72 select GENERIC_PCI_IOMAP
73
74config STMP_DEVICE
75 bool
76
77config ARCH_USE_CMPXCHG_LOCKREF
78 bool
79
80config ARCH_HAS_FAST_MULTIPLIER
81 bool
82
83config INDIRECT_PIO
84 bool "Access I/O in non-MMIO mode"
85 depends on ARM64
86 help
87 On some platforms where no separate I/O space exists, there are I/O
88 hosts which can not be accessed in MMIO mode. Using the logical PIO
89 mechanism, the host-local I/O resource can be mapped into system
90 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
91 system can access the I/O devices with the mapped-logic PIO through
92 I/O accessors.
93
94 This way has relatively little I/O performance cost. Please make
95 sure your devices really need this configure item enabled.
96
97 When in doubt, say N.
98
99config CRC_CCITT
100 tristate "CRC-CCITT functions"
101 help
102 This option is provided for the case where no in-kernel-tree
103 modules require CRC-CCITT functions, but a module built outside
104 the kernel tree does. Such modules that use library CRC-CCITT
105 functions require M here.
106
107config CRC16
108 tristate "CRC16 functions"
109 help
110 This option is provided for the case where no in-kernel-tree
111 modules require CRC16 functions, but a module built outside
112 the kernel tree does. Such modules that use library CRC16
113 functions require M here.
114
115config CRC_T10DIF
116 tristate "CRC calculation for the T10 Data Integrity Field"
117 select CRYPTO
118 select CRYPTO_CRCT10DIF
119 help
120 This option is only needed if a module that's not in the
121 kernel tree needs to calculate CRC checks for use with the
122 SCSI data integrity subsystem.
123
124config CRC_ITU_T
125 tristate "CRC ITU-T V.41 functions"
126 help
127 This option is provided for the case where no in-kernel-tree
128 modules require CRC ITU-T V.41 functions, but a module built outside
129 the kernel tree does. Such modules that use library CRC ITU-T V.41
130 functions require M here.
131
132config CRC32
133 tristate "CRC32/CRC32c functions"
134 default y
135 select BITREVERSE
136 help
137 This option is provided for the case where no in-kernel-tree
138 modules require CRC32/CRC32c functions, but a module built outside
139 the kernel tree does. Such modules that use library CRC32/CRC32c
140 functions require M here.
141
142config CRC32_SELFTEST
143 tristate "CRC32 perform self test on init"
144 depends on CRC32
145 help
146 This option enables the CRC32 library functions to perform a
147 self test on initialization. The self test computes crc32_le
148 and crc32_be over byte strings with random alignment and length
149 and computes the total elapsed time and number of bytes processed.
150
151choice
152 prompt "CRC32 implementation"
153 depends on CRC32
154 default CRC32_SLICEBY8
155 help
156 This option allows a kernel builder to override the default choice
157 of CRC32 algorithm. Choose the default ("slice by 8") unless you
158 know that you need one of the others.
159
160config CRC32_SLICEBY8
161 bool "Slice by 8 bytes"
162 help
163 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
164 This is the fastest algorithm, but comes with a 8KiB lookup table.
165 Most modern processors have enough cache to hold this table without
166 thrashing the cache.
167
168 This is the default implementation choice. Choose this one unless
169 you have a good reason not to.
170
171config CRC32_SLICEBY4
172 bool "Slice by 4 bytes"
173 help
174 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
175 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
176 table.
177
178 Only choose this option if you know what you are doing.
179
180config CRC32_SARWATE
181 bool "Sarwate's Algorithm (one byte at a time)"
182 help
183 Calculate checksum a byte at a time using Sarwate's algorithm. This
184 is not particularly fast, but has a small 256 byte lookup table.
185
186 Only choose this option if you know what you are doing.
187
188config CRC32_BIT
189 bool "Classic Algorithm (one bit at a time)"
190 help
191 Calculate checksum one bit at a time. This is VERY slow, but has
192 no lookup table. This is provided as a debugging option.
193
194 Only choose this option if you are debugging crc32.
195
196endchoice
197
198config CRC64
199 tristate "CRC64 functions"
200 help
201 This option is provided for the case where no in-kernel-tree
202 modules require CRC64 functions, but a module built outside
203 the kernel tree does. Such modules that use library CRC64
204 functions require M here.
205
206config CRC4
207 tristate "CRC4 functions"
208 help
209 This option is provided for the case where no in-kernel-tree
210 modules require CRC4 functions, but a module built outside
211 the kernel tree does. Such modules that use library CRC4
212 functions require M here.
213
214config CRC7
215 tristate "CRC7 functions"
216 help
217 This option is provided for the case where no in-kernel-tree
218 modules require CRC7 functions, but a module built outside
219 the kernel tree does. Such modules that use library CRC7
220 functions require M here.
221
222config LIBCRC32C
223 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
224 select CRYPTO
225 select CRYPTO_CRC32C
226 help
227 This option is provided for the case where no in-kernel-tree
228 modules require CRC32c functions, but a module built outside the
229 kernel tree does. Such modules that use library CRC32c functions
230 require M here. See Castagnoli93.
231 Module will be libcrc32c.
232
233config CRC8
234 tristate "CRC8 function"
235 help
236 This option provides CRC8 function. Drivers may select this
237 when they need to do cyclic redundancy check according CRC8
238 algorithm. Module will be called crc8.
239
240config XXHASH
241 tristate
242
243config AUDIT_GENERIC
244 bool
245 depends on AUDIT && !AUDIT_ARCH
246 default y
247
248config AUDIT_ARCH_COMPAT_GENERIC
249 bool
250 default n
251
252config AUDIT_COMPAT_GENERIC
253 bool
254 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
255 default y
256
257config RANDOM32_SELFTEST
258 bool "PRNG perform self test on init"
259 help
260 This option enables the 32 bit PRNG library functions to perform a
261 self test on initialization.
262
263#
264# compression support is select'ed if needed
265#
266config 842_COMPRESS
267 select CRC32
268 tristate
269
270config 842_DECOMPRESS
271 select CRC32
272 tristate
273
274config ZLIB_INFLATE
275 tristate
276
277config ZLIB_DEFLATE
278 tristate
279 select BITREVERSE
280
281config LZO_COMPRESS
282 tristate
283
284config LZO_DECOMPRESS
285 tristate
286
287config LZ4_COMPRESS
288 tristate
289
290config LZ4HC_COMPRESS
291 tristate
292
293config LZ4_DECOMPRESS
294 tristate
295
296config ZSTD_COMPRESS
297 select XXHASH
298 tristate
299
300config ZSTD_DECOMPRESS
301 select XXHASH
302 tristate
303
304source "lib/xz/Kconfig"
305
306#
307# These all provide a common interface (hence the apparent duplication with
308# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
309#
310config DECOMPRESS_GZIP
311 select ZLIB_INFLATE
312 tristate
313
314config DECOMPRESS_BZIP2
315 tristate
316
317config DECOMPRESS_LZMA
318 tristate
319
320config DECOMPRESS_XZ
321 select XZ_DEC
322 tristate
323
324config DECOMPRESS_LZO
325 select LZO_DECOMPRESS
326 tristate
327
328config DECOMPRESS_LZ4
329 select LZ4_DECOMPRESS
330 tristate
331
332#
333# Generic allocator support is selected if needed
334#
335config GENERIC_ALLOCATOR
336 bool
337
338#
339# reed solomon support is select'ed if needed
340#
341config REED_SOLOMON
342 tristate
343
344config REED_SOLOMON_ENC8
345 bool
346
347config REED_SOLOMON_DEC8
348 bool
349
350config REED_SOLOMON_ENC16
351 bool
352
353config REED_SOLOMON_DEC16
354 bool
355
356#
357# BCH support is selected if needed
358#
359config BCH
360 tristate
361
362config BCH_CONST_PARAMS
363 bool
364 help
365 Drivers may select this option to force specific constant
366 values for parameters 'm' (Galois field order) and 't'
367 (error correction capability). Those specific values must
368 be set by declaring default values for symbols BCH_CONST_M
369 and BCH_CONST_T.
370 Doing so will enable extra compiler optimizations,
371 improving encoding and decoding performance up to 2x for
372 usual (m,t) values (typically such that m*t < 200).
373 When this option is selected, the BCH library supports
374 only a single (m,t) configuration. This is mainly useful
375 for NAND flash board drivers requiring known, fixed BCH
376 parameters.
377
378config BCH_CONST_M
379 int
380 range 5 15
381 help
382 Constant value for Galois field order 'm'. If 'k' is the
383 number of data bits to protect, 'm' should be chosen such
384 that (k + m*t) <= 2**m - 1.
385 Drivers should declare a default value for this symbol if
386 they select option BCH_CONST_PARAMS.
387
388config BCH_CONST_T
389 int
390 help
391 Constant value for error correction capability in bits 't'.
392 Drivers should declare a default value for this symbol if
393 they select option BCH_CONST_PARAMS.
394
395#
396# Textsearch support is select'ed if needed
397#
398config TEXTSEARCH
399 bool
400
401config TEXTSEARCH_KMP
402 tristate
403
404config TEXTSEARCH_BM
405 tristate
406
407config TEXTSEARCH_FSM
408 tristate
409
410config BTREE
411 bool
412
413config INTERVAL_TREE
414 bool
415 help
416 Simple, embeddable, interval-tree. Can find the start of an
417 overlapping range in log(n) time and then iterate over all
418 overlapping nodes. The algorithm is implemented as an
419 augmented rbtree.
420
421 See:
422
423 Documentation/rbtree.txt
424
425 for more information.
426
427config XARRAY_MULTI
428 bool
429 help
430 Support entries which occupy multiple consecutive indices in the
431 XArray.
432
433config ASSOCIATIVE_ARRAY
434 bool
435 help
436 Generic associative array. Can be searched and iterated over whilst
437 it is being modified. It is also reasonably quick to search and
438 modify. The algorithms are non-recursive, and the trees are highly
439 capacious.
440
441 See:
442
443 Documentation/core-api/assoc_array.rst
444
445 for more information.
446
447config HAS_IOMEM
448 bool
449 depends on !NO_IOMEM
450 default y
451
452config HAS_IOPORT_MAP
453 bool
454 depends on HAS_IOMEM && !NO_IOPORT_MAP
455 default y
456
457source "kernel/dma/Kconfig"
458
459config SGL_ALLOC
460 bool
461 default n
462
463config IOMMU_HELPER
464 bool
465
466config CHECK_SIGNATURE
467 bool
468
469config CPUMASK_OFFSTACK
470 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
471 help
472 Use dynamic allocation for cpumask_var_t, instead of putting
473 them on the stack. This is a bit more expensive, but avoids
474 stack overflow.
475
476config CPU_RMAP
477 bool
478 depends on SMP
479
480config DQL
481 bool
482
483config GLOB
484 bool
485# This actually supports modular compilation, but the module overhead
486# is ridiculous for the amount of code involved. Until an out-of-tree
487# driver asks for it, we'll just link it directly it into the kernel
488# when required. Since we're ignoring out-of-tree users, there's also
489# no need bother prompting for a manual decision:
490# prompt "glob_match() function"
491 help
492 This option provides a glob_match function for performing
493 simple text pattern matching. It originated in the ATA code
494 to blacklist particular drive models, but other device drivers
495 may need similar functionality.
496
497 All drivers in the Linux kernel tree that require this function
498 should automatically select this option. Say N unless you
499 are compiling an out-of tree driver which tells you that it
500 depends on this.
501
502config GLOB_SELFTEST
503 tristate "glob self-test on init"
504 depends on GLOB
505 help
506 This option enables a simple self-test of the glob_match
507 function on startup. It is primarily useful for people
508 working on the code to ensure they haven't introduced any
509 regressions.
510
511 It only adds a little bit of code and slows kernel boot (or
512 module load) by a small amount, so you're welcome to play with
513 it, but you probably don't need it.
514
515#
516# Netlink attribute parsing support is select'ed if needed
517#
518config NLATTR
519 bool
520
521#
522# Generic 64-bit atomic support is selected if needed
523#
524config GENERIC_ATOMIC64
525 bool
526
527config LRU_CACHE
528 tristate
529
530config CLZ_TAB
531 bool
532
533config IRQ_POLL
534 bool "IRQ polling library"
535 help
536 Helper library to poll interrupt mitigation using polling.
537
538config MPILIB
539 tristate
540 select CLZ_TAB
541 help
542 Multiprecision maths library from GnuPG.
543 It is used to implement RSA digital signature verification,
544 which is used by IMA/EVM digital signature extension.
545
546config SIGNATURE
547 tristate
548 depends on KEYS
549 select CRYPTO
550 select CRYPTO_SHA1
551 select MPILIB
552 help
553 Digital signature verification. Currently only RSA is supported.
554 Implementation is done using GnuPG MPI library
555
556config DIMLIB
557 bool
558 help
559 Dynamic Interrupt Moderation library.
560 Implements an algorithm for dynamically changing CQ moderation values
561 according to run time performance.
562
563#
564# libfdt files, only selected if needed.
565#
566config LIBFDT
567 bool
568
569config OID_REGISTRY
570 tristate
571 help
572 Enable fast lookup object identifier registry.
573
574config UCS2_STRING
575 tristate
576
577#
578# generic vdso
579#
580source "lib/vdso/Kconfig"
581
582source "lib/fonts/Kconfig"
583
584config SG_SPLIT
585 def_bool n
586 help
587 Provides a helper to split scatterlists into chunks, each chunk being
588 a scatterlist. This should be selected by a driver or an API which
589 whishes to split a scatterlist amongst multiple DMA channels.
590
591config SG_POOL
592 def_bool n
593 help
594 Provides a helper to allocate chained scatterlists. This should be
595 selected by a driver or an API which whishes to allocate chained
596 scatterlist.
597
598#
599# sg chaining option
600#
601
602config ARCH_NO_SG_CHAIN
603 def_bool n
604
605config ARCH_HAS_PMEM_API
606 bool
607
608# use memcpy to implement user copies for nommu architectures
609config UACCESS_MEMCPY
610 bool
611
612config ARCH_HAS_UACCESS_FLUSHCACHE
613 bool
614
615config ARCH_HAS_UACCESS_MCSAFE
616 bool
617
618# Temporary. Goes away when all archs are cleaned up
619config ARCH_STACKWALK
620 bool
621
622config STACKDEPOT
623 bool
624 select STACKTRACE
625
626config SBITMAP
627 bool
628
629config PARMAN
630 tristate "parman" if COMPILE_TEST
631
632config OBJAGG
633 tristate "objagg" if COMPILE_TEST
634
635config STRING_SELFTEST
636 tristate "Test string functions"
637
638endmenu
639
640config GENERIC_LIB_ASHLDI3
641 bool
642
643config GENERIC_LIB_ASHRDI3
644 bool
645
646config GENERIC_LIB_LSHRDI3
647 bool
648
649config GENERIC_LIB_MULDI3
650 bool
651
652config GENERIC_LIB_CMPDI2
653 bool
654
655config GENERIC_LIB_UCMPDI2
656 bool