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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 HAVE_ARCH_BITREVERSE
17 bool
18 default n
19 depends on BITREVERSE
20 help
21 This option enables the use of hardware bit-reversal instructions on
22 architectures which support such operations.
23
24config RATIONAL
25 bool
26
27config GENERIC_STRNCPY_FROM_USER
28 bool
29
30config GENERIC_STRNLEN_USER
31 bool
32
33config GENERIC_NET_UTILS
34 bool
35
36config GENERIC_FIND_FIRST_BIT
37 bool
38
39config NO_GENERIC_PCI_IOPORT_MAP
40 bool
41
42config GENERIC_PCI_IOMAP
43 bool
44
45config GENERIC_IOMAP
46 bool
47 select GENERIC_PCI_IOMAP
48
49config GENERIC_IO
50 bool
51 default n
52
53config STMP_DEVICE
54 bool
55
56config ARCH_USE_CMPXCHG_LOCKREF
57 bool
58
59config ARCH_HAS_FAST_MULTIPLIER
60 bool
61
62config CRC_CCITT
63 tristate "CRC-CCITT functions"
64 help
65 This option is provided for the case where no in-kernel-tree
66 modules require CRC-CCITT functions, but a module built outside
67 the kernel tree does. Such modules that use library CRC-CCITT
68 functions require M here.
69
70config CRC16
71 tristate "CRC16 functions"
72 help
73 This option is provided for the case where no in-kernel-tree
74 modules require CRC16 functions, but a module built outside
75 the kernel tree does. Such modules that use library CRC16
76 functions require M here.
77
78config CRC_T10DIF
79 tristate "CRC calculation for the T10 Data Integrity Field"
80 select CRYPTO
81 select CRYPTO_CRCT10DIF
82 help
83 This option is only needed if a module that's not in the
84 kernel tree needs to calculate CRC checks for use with the
85 SCSI data integrity subsystem.
86
87config CRC_ITU_T
88 tristate "CRC ITU-T V.41 functions"
89 help
90 This option is provided for the case where no in-kernel-tree
91 modules require CRC ITU-T V.41 functions, but a module built outside
92 the kernel tree does. Such modules that use library CRC ITU-T V.41
93 functions require M here.
94
95config CRC32
96 tristate "CRC32/CRC32c functions"
97 default y
98 select BITREVERSE
99 help
100 This option is provided for the case where no in-kernel-tree
101 modules require CRC32/CRC32c functions, but a module built outside
102 the kernel tree does. Such modules that use library CRC32/CRC32c
103 functions require M here.
104
105config CRC32_SELFTEST
106 bool "CRC32 perform self test on init"
107 default n
108 depends on CRC32
109 help
110 This option enables the CRC32 library functions to perform a
111 self test on initialization. The self test computes crc32_le
112 and crc32_be over byte strings with random alignment and length
113 and computes the total elapsed time and number of bytes processed.
114
115choice
116 prompt "CRC32 implementation"
117 depends on CRC32
118 default CRC32_SLICEBY8
119 help
120 This option allows a kernel builder to override the default choice
121 of CRC32 algorithm. Choose the default ("slice by 8") unless you
122 know that you need one of the others.
123
124config CRC32_SLICEBY8
125 bool "Slice by 8 bytes"
126 help
127 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
128 This is the fastest algorithm, but comes with a 8KiB lookup table.
129 Most modern processors have enough cache to hold this table without
130 thrashing the cache.
131
132 This is the default implementation choice. Choose this one unless
133 you have a good reason not to.
134
135config CRC32_SLICEBY4
136 bool "Slice by 4 bytes"
137 help
138 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
139 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
140 table.
141
142 Only choose this option if you know what you are doing.
143
144config CRC32_SARWATE
145 bool "Sarwate's Algorithm (one byte at a time)"
146 help
147 Calculate checksum a byte at a time using Sarwate's algorithm. This
148 is not particularly fast, but has a small 256 byte lookup table.
149
150 Only choose this option if you know what you are doing.
151
152config CRC32_BIT
153 bool "Classic Algorithm (one bit at a time)"
154 help
155 Calculate checksum one bit at a time. This is VERY slow, but has
156 no lookup table. This is provided as a debugging option.
157
158 Only choose this option if you are debugging crc32.
159
160endchoice
161
162config CRC7
163 tristate "CRC7 functions"
164 help
165 This option is provided for the case where no in-kernel-tree
166 modules require CRC7 functions, but a module built outside
167 the kernel tree does. Such modules that use library CRC7
168 functions require M here.
169
170config LIBCRC32C
171 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
172 select CRYPTO
173 select CRYPTO_CRC32C
174 help
175 This option is provided for the case where no in-kernel-tree
176 modules require CRC32c functions, but a module built outside the
177 kernel tree does. Such modules that use library CRC32c functions
178 require M here. See Castagnoli93.
179 Module will be libcrc32c.
180
181config CRC8
182 tristate "CRC8 function"
183 help
184 This option provides CRC8 function. Drivers may select this
185 when they need to do cyclic redundancy check according CRC8
186 algorithm. Module will be called crc8.
187
188config AUDIT_GENERIC
189 bool
190 depends on AUDIT && !AUDIT_ARCH
191 default y
192
193config AUDIT_ARCH_COMPAT_GENERIC
194 bool
195 default n
196
197config AUDIT_COMPAT_GENERIC
198 bool
199 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
200 default y
201
202config RANDOM32_SELFTEST
203 bool "PRNG perform self test on init"
204 default n
205 help
206 This option enables the 32 bit PRNG library functions to perform a
207 self test on initialization.
208
209#
210# compression support is select'ed if needed
211#
212config 842_COMPRESS
213 select CRC32
214 tristate
215
216config 842_DECOMPRESS
217 select CRC32
218 tristate
219
220config ZLIB_INFLATE
221 tristate
222
223config ZLIB_DEFLATE
224 tristate
225 select BITREVERSE
226
227config LZO_COMPRESS
228 tristate
229
230config LZO_DECOMPRESS
231 tristate
232
233config LZ4_COMPRESS
234 tristate
235
236config LZ4HC_COMPRESS
237 tristate
238
239config LZ4_DECOMPRESS
240 tristate
241
242source "lib/xz/Kconfig"
243
244#
245# These all provide a common interface (hence the apparent duplication with
246# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
247#
248config DECOMPRESS_GZIP
249 select ZLIB_INFLATE
250 tristate
251
252config DECOMPRESS_BZIP2
253 tristate
254
255config DECOMPRESS_LZMA
256 tristate
257
258config DECOMPRESS_XZ
259 select XZ_DEC
260 tristate
261
262config DECOMPRESS_LZO
263 select LZO_DECOMPRESS
264 tristate
265
266config DECOMPRESS_LZ4
267 select LZ4_DECOMPRESS
268 tristate
269
270#
271# Generic allocator support is selected if needed
272#
273config GENERIC_ALLOCATOR
274 bool
275
276#
277# reed solomon support is select'ed if needed
278#
279config REED_SOLOMON
280 tristate
281
282config REED_SOLOMON_ENC8
283 bool
284
285config REED_SOLOMON_DEC8
286 bool
287
288config REED_SOLOMON_ENC16
289 bool
290
291config REED_SOLOMON_DEC16
292 bool
293
294#
295# BCH support is selected if needed
296#
297config BCH
298 tristate
299
300config BCH_CONST_PARAMS
301 bool
302 help
303 Drivers may select this option to force specific constant
304 values for parameters 'm' (Galois field order) and 't'
305 (error correction capability). Those specific values must
306 be set by declaring default values for symbols BCH_CONST_M
307 and BCH_CONST_T.
308 Doing so will enable extra compiler optimizations,
309 improving encoding and decoding performance up to 2x for
310 usual (m,t) values (typically such that m*t < 200).
311 When this option is selected, the BCH library supports
312 only a single (m,t) configuration. This is mainly useful
313 for NAND flash board drivers requiring known, fixed BCH
314 parameters.
315
316config BCH_CONST_M
317 int
318 range 5 15
319 help
320 Constant value for Galois field order 'm'. If 'k' is the
321 number of data bits to protect, 'm' should be chosen such
322 that (k + m*t) <= 2**m - 1.
323 Drivers should declare a default value for this symbol if
324 they select option BCH_CONST_PARAMS.
325
326config BCH_CONST_T
327 int
328 help
329 Constant value for error correction capability in bits 't'.
330 Drivers should declare a default value for this symbol if
331 they select option BCH_CONST_PARAMS.
332
333#
334# Textsearch support is select'ed if needed
335#
336config TEXTSEARCH
337 bool
338
339config TEXTSEARCH_KMP
340 tristate
341
342config TEXTSEARCH_BM
343 tristate
344
345config TEXTSEARCH_FSM
346 tristate
347
348config BTREE
349 bool
350
351config INTERVAL_TREE
352 bool
353 help
354 Simple, embeddable, interval-tree. Can find the start of an
355 overlapping range in log(n) time and then iterate over all
356 overlapping nodes. The algorithm is implemented as an
357 augmented rbtree.
358
359 See:
360
361 Documentation/rbtree.txt
362
363 for more information.
364
365config ASSOCIATIVE_ARRAY
366 bool
367 help
368 Generic associative array. Can be searched and iterated over whilst
369 it is being modified. It is also reasonably quick to search and
370 modify. The algorithms are non-recursive, and the trees are highly
371 capacious.
372
373 See:
374
375 Documentation/assoc_array.txt
376
377 for more information.
378
379config HAS_IOMEM
380 bool
381 depends on !NO_IOMEM
382 select GENERIC_IO
383 default y
384
385config HAS_IOPORT_MAP
386 bool
387 depends on HAS_IOMEM && !NO_IOPORT_MAP
388 default y
389
390config HAS_DMA
391 bool
392 depends on !NO_DMA
393 default y
394
395config CHECK_SIGNATURE
396 bool
397
398config CPUMASK_OFFSTACK
399 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
400 help
401 Use dynamic allocation for cpumask_var_t, instead of putting
402 them on the stack. This is a bit more expensive, but avoids
403 stack overflow.
404
405config CPU_RMAP
406 bool
407 depends on SMP
408
409config DQL
410 bool
411
412config GLOB
413 bool
414# This actually supports modular compilation, but the module overhead
415# is ridiculous for the amount of code involved. Until an out-of-tree
416# driver asks for it, we'll just link it directly it into the kernel
417# when required. Since we're ignoring out-of-tree users, there's also
418# no need bother prompting for a manual decision:
419# prompt "glob_match() function"
420 help
421 This option provides a glob_match function for performing
422 simple text pattern matching. It originated in the ATA code
423 to blacklist particular drive models, but other device drivers
424 may need similar functionality.
425
426 All drivers in the Linux kernel tree that require this function
427 should automatically select this option. Say N unless you
428 are compiling an out-of tree driver which tells you that it
429 depends on this.
430
431config GLOB_SELFTEST
432 bool "glob self-test on init"
433 default n
434 depends on GLOB
435 help
436 This option enables a simple self-test of the glob_match
437 function on startup. It is primarily useful for people
438 working on the code to ensure they haven't introduced any
439 regressions.
440
441 It only adds a little bit of code and slows kernel boot (or
442 module load) by a small amount, so you're welcome to play with
443 it, but you probably don't need it.
444
445#
446# Netlink attribute parsing support is select'ed if needed
447#
448config NLATTR
449 bool
450
451#
452# Generic 64-bit atomic support is selected if needed
453#
454config GENERIC_ATOMIC64
455 bool
456
457config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
458 def_bool y if GENERIC_ATOMIC64
459
460config LRU_CACHE
461 tristate
462
463config CLZ_TAB
464 bool
465
466config CORDIC
467 tristate "CORDIC algorithm"
468 help
469 This option provides an implementation of the CORDIC algorithm;
470 calculations are in fixed point. Module will be called cordic.
471
472config 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
480config IRQ_POLL
481 bool "IRQ polling library"
482 help
483 Helper library to poll interrupt mitigation using polling.
484
485config MPILIB
486 tristate
487 select CLZ_TAB
488 help
489 Multiprecision maths library from GnuPG.
490 It is used to implement RSA digital signature verification,
491 which is used by IMA/EVM digital signature extension.
492
493config SIGNATURE
494 tristate
495 depends on KEYS
496 select CRYPTO
497 select CRYPTO_SHA1
498 select MPILIB
499 help
500 Digital signature verification. Currently only RSA is supported.
501 Implementation is done using GnuPG MPI library
502
503#
504# libfdt files, only selected if needed.
505#
506config LIBFDT
507 bool
508
509config OID_REGISTRY
510 tristate
511 help
512 Enable fast lookup object identifier registry.
513
514config UCS2_STRING
515 tristate
516
517source "lib/fonts/Kconfig"
518
519config SG_SPLIT
520 def_bool n
521 help
522 Provides a helper to split scatterlists into chunks, each chunk being
523 a scatterlist. This should be selected by a driver or an API which
524 whishes to split a scatterlist amongst multiple DMA channels.
525
526#
527# sg chaining option
528#
529
530config ARCH_HAS_SG_CHAIN
531 def_bool n
532
533config ARCH_HAS_PMEM_API
534 bool
535
536config ARCH_HAS_MMIO_FLUSH
537 bool
538
539config STACKDEPOT
540 bool
541 select STACKTRACE
542
543endmenu
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 LINEAR_RANGES
23 tristate
24
25config PACKING
26 bool "Generic bitfield packing and unpacking"
27 default n
28 help
29 This option provides the packing() helper function, which permits
30 converting bitfields between a CPU-usable representation and a
31 memory representation that can have any combination of these quirks:
32 - Is little endian (bytes are reversed within a 32-bit group)
33 - The least-significant 32-bit word comes first (within a 64-bit
34 group)
35 - The most significant bit of a byte is at its right (bit 0 of a
36 register description is numerically 2^7).
37 Drivers may use these helpers to match the bit indices as described
38 in the data sheets of the peripherals they are in control of.
39
40 When in doubt, say N.
41
42config BITREVERSE
43 tristate
44
45config HAVE_ARCH_BITREVERSE
46 bool
47 default n
48 depends on BITREVERSE
49 help
50 This option enables the use of hardware bit-reversal instructions on
51 architectures which support such operations.
52
53config GENERIC_STRNCPY_FROM_USER
54 bool
55
56config GENERIC_STRNLEN_USER
57 bool
58
59config GENERIC_NET_UTILS
60 bool
61
62config GENERIC_FIND_FIRST_BIT
63 bool
64
65source "lib/math/Kconfig"
66
67config NO_GENERIC_PCI_IOPORT_MAP
68 bool
69
70config GENERIC_PCI_IOMAP
71 bool
72
73config GENERIC_IOMAP
74 bool
75 select GENERIC_PCI_IOMAP
76
77config STMP_DEVICE
78 bool
79
80config ARCH_USE_CMPXCHG_LOCKREF
81 bool
82
83config ARCH_HAS_FAST_MULTIPLIER
84 bool
85
86config ARCH_USE_SYM_ANNOTATIONS
87 bool
88
89config INDIRECT_PIO
90 bool "Access I/O in non-MMIO mode"
91 depends on ARM64
92 help
93 On some platforms where no separate I/O space exists, there are I/O
94 hosts which can not be accessed in MMIO mode. Using the logical PIO
95 mechanism, the host-local I/O resource can be mapped into system
96 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
97 system can access the I/O devices with the mapped-logic PIO through
98 I/O accessors.
99
100 This way has relatively little I/O performance cost. Please make
101 sure your devices really need this configure item enabled.
102
103 When in doubt, say N.
104
105config CRC_CCITT
106 tristate "CRC-CCITT functions"
107 help
108 This option is provided for the case where no in-kernel-tree
109 modules require CRC-CCITT functions, but a module built outside
110 the kernel tree does. Such modules that use library CRC-CCITT
111 functions require M here.
112
113config CRC16
114 tristate "CRC16 functions"
115 help
116 This option is provided for the case where no in-kernel-tree
117 modules require CRC16 functions, but a module built outside
118 the kernel tree does. Such modules that use library CRC16
119 functions require M here.
120
121config CRC_T10DIF
122 tristate "CRC calculation for the T10 Data Integrity Field"
123 select CRYPTO
124 select CRYPTO_CRCT10DIF
125 help
126 This option is only needed if a module that's not in the
127 kernel tree needs to calculate CRC checks for use with the
128 SCSI data integrity subsystem.
129
130config CRC_ITU_T
131 tristate "CRC ITU-T V.41 functions"
132 help
133 This option is provided for the case where no in-kernel-tree
134 modules require CRC ITU-T V.41 functions, but a module built outside
135 the kernel tree does. Such modules that use library CRC ITU-T V.41
136 functions require M here.
137
138config CRC32
139 tristate "CRC32/CRC32c functions"
140 default y
141 select BITREVERSE
142 help
143 This option is provided for the case where no in-kernel-tree
144 modules require CRC32/CRC32c functions, but a module built outside
145 the kernel tree does. Such modules that use library CRC32/CRC32c
146 functions require M here.
147
148config CRC32_SELFTEST
149 tristate "CRC32 perform self test on init"
150 depends on CRC32
151 help
152 This option enables the CRC32 library functions to perform a
153 self test on initialization. The self test computes crc32_le
154 and crc32_be over byte strings with random alignment and length
155 and computes the total elapsed time and number of bytes processed.
156
157choice
158 prompt "CRC32 implementation"
159 depends on CRC32
160 default CRC32_SLICEBY8
161 help
162 This option allows a kernel builder to override the default choice
163 of CRC32 algorithm. Choose the default ("slice by 8") unless you
164 know that you need one of the others.
165
166config CRC32_SLICEBY8
167 bool "Slice by 8 bytes"
168 help
169 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
170 This is the fastest algorithm, but comes with a 8KiB lookup table.
171 Most modern processors have enough cache to hold this table without
172 thrashing the cache.
173
174 This is the default implementation choice. Choose this one unless
175 you have a good reason not to.
176
177config CRC32_SLICEBY4
178 bool "Slice by 4 bytes"
179 help
180 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
181 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
182 table.
183
184 Only choose this option if you know what you are doing.
185
186config CRC32_SARWATE
187 bool "Sarwate's Algorithm (one byte at a time)"
188 help
189 Calculate checksum a byte at a time using Sarwate's algorithm. This
190 is not particularly fast, but has a small 256 byte lookup table.
191
192 Only choose this option if you know what you are doing.
193
194config CRC32_BIT
195 bool "Classic Algorithm (one bit at a time)"
196 help
197 Calculate checksum one bit at a time. This is VERY slow, but has
198 no lookup table. This is provided as a debugging option.
199
200 Only choose this option if you are debugging crc32.
201
202endchoice
203
204config CRC64
205 tristate "CRC64 functions"
206 help
207 This option is provided for the case where no in-kernel-tree
208 modules require CRC64 functions, but a module built outside
209 the kernel tree does. Such modules that use library CRC64
210 functions require M here.
211
212config CRC4
213 tristate "CRC4 functions"
214 help
215 This option is provided for the case where no in-kernel-tree
216 modules require CRC4 functions, but a module built outside
217 the kernel tree does. Such modules that use library CRC4
218 functions require M here.
219
220config CRC7
221 tristate "CRC7 functions"
222 help
223 This option is provided for the case where no in-kernel-tree
224 modules require CRC7 functions, but a module built outside
225 the kernel tree does. Such modules that use library CRC7
226 functions require M here.
227
228config LIBCRC32C
229 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
230 select CRYPTO
231 select CRYPTO_CRC32C
232 help
233 This option is provided for the case where no in-kernel-tree
234 modules require CRC32c functions, but a module built outside the
235 kernel tree does. Such modules that use library CRC32c functions
236 require M here. See Castagnoli93.
237 Module will be libcrc32c.
238
239config CRC8
240 tristate "CRC8 function"
241 help
242 This option provides CRC8 function. Drivers may select this
243 when they need to do cyclic redundancy check according CRC8
244 algorithm. Module will be called crc8.
245
246config XXHASH
247 tristate
248
249config AUDIT_GENERIC
250 bool
251 depends on AUDIT && !AUDIT_ARCH
252 default y
253
254config AUDIT_ARCH_COMPAT_GENERIC
255 bool
256 default n
257
258config AUDIT_COMPAT_GENERIC
259 bool
260 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
261 default y
262
263config RANDOM32_SELFTEST
264 bool "PRNG perform self test on init"
265 help
266 This option enables the 32 bit PRNG library functions to perform a
267 self test on initialization.
268
269#
270# compression support is select'ed if needed
271#
272config 842_COMPRESS
273 select CRC32
274 tristate
275
276config 842_DECOMPRESS
277 select CRC32
278 tristate
279
280config ZLIB_INFLATE
281 tristate
282
283config ZLIB_DEFLATE
284 tristate
285 select BITREVERSE
286
287config ZLIB_DFLTCC
288 def_bool y
289 depends on S390
290 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
291 help
292 Enable s390x hardware support for zlib in the kernel.
293
294config LZO_COMPRESS
295 tristate
296
297config LZO_DECOMPRESS
298 tristate
299
300config LZ4_COMPRESS
301 tristate
302
303config LZ4HC_COMPRESS
304 tristate
305
306config LZ4_DECOMPRESS
307 tristate
308
309config ZSTD_COMPRESS
310 select XXHASH
311 tristate
312
313config ZSTD_DECOMPRESS
314 select XXHASH
315 tristate
316
317source "lib/xz/Kconfig"
318
319#
320# These all provide a common interface (hence the apparent duplication with
321# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
322#
323config DECOMPRESS_GZIP
324 select ZLIB_INFLATE
325 tristate
326
327config DECOMPRESS_BZIP2
328 tristate
329
330config DECOMPRESS_LZMA
331 tristate
332
333config DECOMPRESS_XZ
334 select XZ_DEC
335 tristate
336
337config DECOMPRESS_LZO
338 select LZO_DECOMPRESS
339 tristate
340
341config DECOMPRESS_LZ4
342 select LZ4_DECOMPRESS
343 tristate
344
345config DECOMPRESS_ZSTD
346 select ZSTD_DECOMPRESS
347 tristate
348
349#
350# Generic allocator support is selected if needed
351#
352config GENERIC_ALLOCATOR
353 bool
354
355#
356# reed solomon support is select'ed if needed
357#
358config REED_SOLOMON
359 tristate
360
361config REED_SOLOMON_ENC8
362 bool
363
364config REED_SOLOMON_DEC8
365 bool
366
367config REED_SOLOMON_ENC16
368 bool
369
370config REED_SOLOMON_DEC16
371 bool
372
373#
374# BCH support is selected if needed
375#
376config BCH
377 tristate
378
379config BCH_CONST_PARAMS
380 bool
381 help
382 Drivers may select this option to force specific constant
383 values for parameters 'm' (Galois field order) and 't'
384 (error correction capability). Those specific values must
385 be set by declaring default values for symbols BCH_CONST_M
386 and BCH_CONST_T.
387 Doing so will enable extra compiler optimizations,
388 improving encoding and decoding performance up to 2x for
389 usual (m,t) values (typically such that m*t < 200).
390 When this option is selected, the BCH library supports
391 only a single (m,t) configuration. This is mainly useful
392 for NAND flash board drivers requiring known, fixed BCH
393 parameters.
394
395config BCH_CONST_M
396 int
397 range 5 15
398 help
399 Constant value for Galois field order 'm'. If 'k' is the
400 number of data bits to protect, 'm' should be chosen such
401 that (k + m*t) <= 2**m - 1.
402 Drivers should declare a default value for this symbol if
403 they select option BCH_CONST_PARAMS.
404
405config BCH_CONST_T
406 int
407 help
408 Constant value for error correction capability in bits 't'.
409 Drivers should declare a default value for this symbol if
410 they select option BCH_CONST_PARAMS.
411
412#
413# Textsearch support is select'ed if needed
414#
415config TEXTSEARCH
416 bool
417
418config TEXTSEARCH_KMP
419 tristate
420
421config TEXTSEARCH_BM
422 tristate
423
424config TEXTSEARCH_FSM
425 tristate
426
427config BTREE
428 bool
429
430config INTERVAL_TREE
431 bool
432 help
433 Simple, embeddable, interval-tree. Can find the start of an
434 overlapping range in log(n) time and then iterate over all
435 overlapping nodes. The algorithm is implemented as an
436 augmented rbtree.
437
438 See:
439
440 Documentation/core-api/rbtree.rst
441
442 for more information.
443
444config XARRAY_MULTI
445 bool
446 help
447 Support entries which occupy multiple consecutive indices in the
448 XArray.
449
450config ASSOCIATIVE_ARRAY
451 bool
452 help
453 Generic associative array. Can be searched and iterated over whilst
454 it is being modified. It is also reasonably quick to search and
455 modify. The algorithms are non-recursive, and the trees are highly
456 capacious.
457
458 See:
459
460 Documentation/core-api/assoc_array.rst
461
462 for more information.
463
464config HAS_IOMEM
465 bool
466 depends on !NO_IOMEM
467 default y
468
469config HAS_IOPORT_MAP
470 bool
471 depends on HAS_IOMEM && !NO_IOPORT_MAP
472 default y
473
474source "kernel/dma/Kconfig"
475
476config SGL_ALLOC
477 bool
478 default n
479
480config IOMMU_HELPER
481 bool
482
483config CHECK_SIGNATURE
484 bool
485
486config CPUMASK_OFFSTACK
487 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
488 help
489 Use dynamic allocation for cpumask_var_t, instead of putting
490 them on the stack. This is a bit more expensive, but avoids
491 stack overflow.
492
493config CPU_RMAP
494 bool
495 depends on SMP
496
497config DQL
498 bool
499
500config GLOB
501 bool
502# This actually supports modular compilation, but the module overhead
503# is ridiculous for the amount of code involved. Until an out-of-tree
504# driver asks for it, we'll just link it directly it into the kernel
505# when required. Since we're ignoring out-of-tree users, there's also
506# no need bother prompting for a manual decision:
507# prompt "glob_match() function"
508 help
509 This option provides a glob_match function for performing
510 simple text pattern matching. It originated in the ATA code
511 to blacklist particular drive models, but other device drivers
512 may need similar functionality.
513
514 All drivers in the Linux kernel tree that require this function
515 should automatically select this option. Say N unless you
516 are compiling an out-of tree driver which tells you that it
517 depends on this.
518
519config GLOB_SELFTEST
520 tristate "glob self-test on init"
521 depends on GLOB
522 help
523 This option enables a simple self-test of the glob_match
524 function on startup. It is primarily useful for people
525 working on the code to ensure they haven't introduced any
526 regressions.
527
528 It only adds a little bit of code and slows kernel boot (or
529 module load) by a small amount, so you're welcome to play with
530 it, but you probably don't need it.
531
532#
533# Netlink attribute parsing support is select'ed if needed
534#
535config NLATTR
536 bool
537
538#
539# Generic 64-bit atomic support is selected if needed
540#
541config GENERIC_ATOMIC64
542 bool
543
544config LRU_CACHE
545 tristate
546
547config CLZ_TAB
548 bool
549
550config IRQ_POLL
551 bool "IRQ polling library"
552 help
553 Helper library to poll interrupt mitigation using polling.
554
555config MPILIB
556 tristate
557 select CLZ_TAB
558 help
559 Multiprecision maths library from GnuPG.
560 It is used to implement RSA digital signature verification,
561 which is used by IMA/EVM digital signature extension.
562
563config SIGNATURE
564 tristate
565 depends on KEYS
566 select CRYPTO
567 select CRYPTO_SHA1
568 select MPILIB
569 help
570 Digital signature verification. Currently only RSA is supported.
571 Implementation is done using GnuPG MPI library
572
573config DIMLIB
574 bool
575 help
576 Dynamic Interrupt Moderation library.
577 Implements an algorithm for dynamically changing CQ moderation values
578 according to run time performance.
579
580#
581# libfdt files, only selected if needed.
582#
583config LIBFDT
584 bool
585
586config OID_REGISTRY
587 tristate
588 help
589 Enable fast lookup object identifier registry.
590
591config UCS2_STRING
592 tristate
593
594#
595# generic vdso
596#
597source "lib/vdso/Kconfig"
598
599source "lib/fonts/Kconfig"
600
601config SG_SPLIT
602 def_bool n
603 help
604 Provides a helper to split scatterlists into chunks, each chunk being
605 a scatterlist. This should be selected by a driver or an API which
606 whishes to split a scatterlist amongst multiple DMA channels.
607
608config SG_POOL
609 def_bool n
610 help
611 Provides a helper to allocate chained scatterlists. This should be
612 selected by a driver or an API which whishes to allocate chained
613 scatterlist.
614
615#
616# sg chaining option
617#
618
619config ARCH_NO_SG_CHAIN
620 def_bool n
621
622config ARCH_HAS_PMEM_API
623 bool
624
625config MEMREGION
626 bool
627
628config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
629 bool
630
631# use memcpy to implement user copies for nommu architectures
632config UACCESS_MEMCPY
633 bool
634
635config ARCH_HAS_UACCESS_FLUSHCACHE
636 bool
637
638config ARCH_HAS_UACCESS_MCSAFE
639 bool
640
641# Temporary. Goes away when all archs are cleaned up
642config ARCH_STACKWALK
643 bool
644
645config STACKDEPOT
646 bool
647 select STACKTRACE
648
649config SBITMAP
650 bool
651
652config PARMAN
653 tristate "parman" if COMPILE_TEST
654
655config OBJAGG
656 tristate "objagg" if COMPILE_TEST
657
658config STRING_SELFTEST
659 tristate "Test string functions"
660
661endmenu
662
663config GENERIC_IOREMAP
664 bool
665
666config GENERIC_LIB_ASHLDI3
667 bool
668
669config GENERIC_LIB_ASHRDI3
670 bool
671
672config GENERIC_LIB_LSHRDI3
673 bool
674
675config GENERIC_LIB_MULDI3
676 bool
677
678config GENERIC_LIB_CMPDI2
679 bool
680
681config GENERIC_LIB_UCMPDI2
682 bool
683
684config PLDMFW
685 bool
686 default n