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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_STRNCPY_FROM_USER
20 bool
21
22config GENERIC_STRNLEN_USER
23 bool
24
25config GENERIC_NET_UTILS
26 bool
27
28config GENERIC_FIND_FIRST_BIT
29 bool
30
31config NO_GENERIC_PCI_IOPORT_MAP
32 bool
33
34config GENERIC_PCI_IOMAP
35 bool
36
37config GENERIC_IOMAP
38 bool
39 select GENERIC_PCI_IOMAP
40
41config GENERIC_IO
42 boolean
43 default n
44
45config STMP_DEVICE
46 bool
47
48config PERCPU_RWSEM
49 boolean
50
51config ARCH_USE_CMPXCHG_LOCKREF
52 bool
53
54config 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
62config 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
70config CRC_T10DIF
71 tristate "CRC calculation for the T10 Data Integrity Field"
72 select CRYPTO
73 select CRYPTO_CRCT10DIF
74 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
79config 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
87config CRC32
88 tristate "CRC32/CRC32c functions"
89 default y
90 select BITREVERSE
91 help
92 This option is provided for the case where no in-kernel-tree
93 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.
96
97config 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
107choice
108 prompt "CRC32 implementation"
109 depends on CRC32
110 default CRC32_SLICEBY8
111 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.
115
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
154config 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
162config LIBCRC32C
163 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
164 select CRYPTO
165 select CRYPTO_CRC32C
166 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
173config 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
180config AUDIT_GENERIC
181 bool
182 depends on AUDIT && !AUDIT_ARCH
183 default y
184
185config 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
194config 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
201#
202# compression support is select'ed if needed
203#
204config ZLIB_INFLATE
205 tristate
206
207config ZLIB_DEFLATE
208 tristate
209
210config LZO_COMPRESS
211 tristate
212
213config LZO_DECOMPRESS
214 tristate
215
216config LZ4_COMPRESS
217 tristate
218
219config LZ4HC_COMPRESS
220 tristate
221
222config LZ4_DECOMPRESS
223 tristate
224
225source "lib/xz/Kconfig"
226
227#
228# These all provide a common interface (hence the apparent duplication with
229# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
230#
231config DECOMPRESS_GZIP
232 select ZLIB_INFLATE
233 tristate
234
235config DECOMPRESS_BZIP2
236 tristate
237
238config DECOMPRESS_LZMA
239 tristate
240
241config DECOMPRESS_XZ
242 select XZ_DEC
243 tristate
244
245config DECOMPRESS_LZO
246 select LZO_DECOMPRESS
247 tristate
248
249config DECOMPRESS_LZ4
250 select LZ4_DECOMPRESS
251 tristate
252
253#
254# Generic allocator support is selected if needed
255#
256config GENERIC_ALLOCATOR
257 boolean
258
259#
260# 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
277#
278# 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#
317# Textsearch support is select'ed if needed
318#
319config TEXTSEARCH
320 boolean
321
322config TEXTSEARCH_KMP
323 tristate
324
325config TEXTSEARCH_BM
326 tristate
327
328config TEXTSEARCH_FSM
329 tristate
330
331config BTREE
332 boolean
333
334config ASSOCIATIVE_ARRAY
335 bool
336 help
337 Generic associative array. Can be searched and iterated over whilst
338 it is being modified. It is also reasonably quick to search and
339 modify. The algorithms are non-recursive, and the trees are highly
340 capacious.
341
342 See:
343
344 Documentation/assoc_array.txt
345
346 for more information.
347
348config HAS_IOMEM
349 boolean
350 depends on !NO_IOMEM
351 select GENERIC_IO
352 default y
353
354config HAS_IOPORT_MAP
355 boolean
356 depends on HAS_IOMEM && !NO_IOPORT_MAP
357 default y
358
359config HAS_DMA
360 boolean
361 depends on !NO_DMA
362 default y
363
364config CHECK_SIGNATURE
365 bool
366
367config CPUMASK_OFFSTACK
368 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
369 help
370 Use dynamic allocation for cpumask_var_t, instead of putting
371 them on the stack. This is a bit more expensive, but avoids
372 stack overflow.
373
374config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
375 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
376 depends on BROKEN
377
378config CPU_RMAP
379 bool
380 depends on SMP
381
382config DQL
383 bool
384
385#
386# Netlink attribute parsing support is select'ed if needed
387#
388config NLATTR
389 bool
390
391#
392# Generic 64-bit atomic support is selected if needed
393#
394config GENERIC_ATOMIC64
395 bool
396
397config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
398 def_bool y if GENERIC_ATOMIC64
399
400config LRU_CACHE
401 tristate
402
403config AVERAGE
404 bool "Averaging functions"
405 help
406 This option is provided for the case where no in-kernel-tree
407 modules require averaging functions, but a module built outside
408 the kernel tree does. Such modules that use library averaging
409 functions require Y here.
410
411 If unsure, say N.
412
413config CLZ_TAB
414 bool
415
416config CORDIC
417 tristate "CORDIC algorithm"
418 help
419 This option provides an implementation of the CORDIC algorithm;
420 calculations are in fixed point. Module will be called cordic.
421
422config DDR
423 bool "JEDEC DDR data"
424 help
425 Data from JEDEC specs for DDR SDRAM memories,
426 particularly the AC timing parameters and addressing
427 information. This data is useful for drivers handling
428 DDR SDRAM controllers.
429
430config MPILIB
431 tristate
432 select CLZ_TAB
433 help
434 Multiprecision maths library from GnuPG.
435 It is used to implement RSA digital signature verification,
436 which is used by IMA/EVM digital signature extension.
437
438config SIGNATURE
439 tristate
440 depends on KEYS && CRYPTO
441 select CRYPTO_SHA1
442 select MPILIB
443 help
444 Digital signature verification. Currently only RSA is supported.
445 Implementation is done using GnuPG MPI library
446
447#
448# libfdt files, only selected if needed.
449#
450config LIBFDT
451 bool
452
453config OID_REGISTRY
454 tristate
455 help
456 Enable fast lookup object identifier registry.
457
458config UCS2_STRING
459 tristate
460
461source "lib/fonts/Kconfig"
462
463endmenu
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 select BITREVERSE
28 default n
29 help
30 This option provides the packing() helper function, which permits
31 converting bitfields between a CPU-usable representation and a
32 memory representation that can have any combination of these quirks:
33 - Is little endian (bytes are reversed within a 32-bit group)
34 - The least-significant 32-bit word comes first (within a 64-bit
35 group)
36 - The most significant bit of a byte is at its right (bit 0 of a
37 register description is numerically 2^7).
38 Drivers may use these helpers to match the bit indices as described
39 in the data sheets of the peripherals they are in control of.
40
41 When in doubt, say N.
42
43config BITREVERSE
44 tristate
45
46config HAVE_ARCH_BITREVERSE
47 bool
48 default n
49 help
50 This option enables the use of hardware bit-reversal instructions on
51 architectures which support such operations.
52
53config ARCH_HAS_STRNCPY_FROM_USER
54 bool
55
56config ARCH_HAS_STRNLEN_USER
57 bool
58
59config GENERIC_STRNCPY_FROM_USER
60 def_bool !ARCH_HAS_STRNCPY_FROM_USER
61
62config GENERIC_STRNLEN_USER
63 def_bool !ARCH_HAS_STRNLEN_USER
64
65config GENERIC_NET_UTILS
66 bool
67
68source "lib/math/Kconfig"
69
70config NO_GENERIC_PCI_IOPORT_MAP
71 bool
72
73config GENERIC_PCI_IOMAP
74 bool
75
76config GENERIC_IOMAP
77 bool
78 select GENERIC_PCI_IOMAP
79
80config STMP_DEVICE
81 bool
82
83config ARCH_USE_CMPXCHG_LOCKREF
84 bool
85
86config ARCH_HAS_FAST_MULTIPLIER
87 bool
88
89config ARCH_USE_SYM_ANNOTATIONS
90 bool
91
92config INDIRECT_PIO
93 bool "Access I/O in non-MMIO mode"
94 depends on ARM64
95 help
96 On some platforms where no separate I/O space exists, there are I/O
97 hosts which can not be accessed in MMIO mode. Using the logical PIO
98 mechanism, the host-local I/O resource can be mapped into system
99 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
100 system can access the I/O devices with the mapped-logic PIO through
101 I/O accessors.
102
103 This way has relatively little I/O performance cost. Please make
104 sure your devices really need this configure item enabled.
105
106 When in doubt, say N.
107
108config INDIRECT_IOMEM
109 bool
110 help
111 This is selected by other options/architectures to provide the
112 emulated iomem accessors.
113
114config INDIRECT_IOMEM_FALLBACK
115 bool
116 depends on INDIRECT_IOMEM
117 help
118 If INDIRECT_IOMEM is selected, this enables falling back to plain
119 mmio accesses when the IO memory address is not a registered
120 emulated region.
121
122config TRACE_MMIO_ACCESS
123 bool "Register read/write tracing"
124 depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS
125 help
126 Create tracepoints for MMIO read/write operations. These trace events
127 can be used for logging all MMIO read/write operations.
128
129source "lib/crypto/Kconfig"
130
131config CRC_CCITT
132 tristate "CRC-CCITT functions"
133 help
134 This option is provided for the case where no in-kernel-tree
135 modules require CRC-CCITT functions, but a module built outside
136 the kernel tree does. Such modules that use library CRC-CCITT
137 functions require M here.
138
139config CRC16
140 tristate "CRC16 functions"
141 help
142 This option is provided for the case where no in-kernel-tree
143 modules require CRC16 functions, but a module built outside
144 the kernel tree does. Such modules that use library CRC16
145 functions require M here.
146
147config CRC_T10DIF
148 tristate "CRC calculation for the T10 Data Integrity Field"
149 select CRYPTO
150 select CRYPTO_CRCT10DIF
151 help
152 This option is only needed if a module that's not in the
153 kernel tree needs to calculate CRC checks for use with the
154 SCSI data integrity subsystem.
155
156config CRC64_ROCKSOFT
157 tristate "CRC calculation for the Rocksoft model CRC64"
158 select CRC64
159 select CRYPTO
160 select CRYPTO_CRC64_ROCKSOFT
161 help
162 This option provides a CRC64 API to a registered crypto driver.
163 This is used with the block layer's data integrity subsystem.
164
165config CRC_ITU_T
166 tristate "CRC ITU-T V.41 functions"
167 help
168 This option is provided for the case where no in-kernel-tree
169 modules require CRC ITU-T V.41 functions, but a module built outside
170 the kernel tree does. Such modules that use library CRC ITU-T V.41
171 functions require M here.
172
173config CRC32
174 tristate "CRC32/CRC32c functions"
175 default y
176 select BITREVERSE
177 help
178 This option is provided for the case where no in-kernel-tree
179 modules require CRC32/CRC32c functions, but a module built outside
180 the kernel tree does. Such modules that use library CRC32/CRC32c
181 functions require M here.
182
183config CRC32_SELFTEST
184 tristate "CRC32 perform self test on init"
185 depends on CRC32
186 help
187 This option enables the CRC32 library functions to perform a
188 self test on initialization. The self test computes crc32_le
189 and crc32_be over byte strings with random alignment and length
190 and computes the total elapsed time and number of bytes processed.
191
192choice
193 prompt "CRC32 implementation"
194 depends on CRC32
195 default CRC32_SLICEBY8
196 help
197 This option allows a kernel builder to override the default choice
198 of CRC32 algorithm. Choose the default ("slice by 8") unless you
199 know that you need one of the others.
200
201config CRC32_SLICEBY8
202 bool "Slice by 8 bytes"
203 help
204 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
205 This is the fastest algorithm, but comes with a 8KiB lookup table.
206 Most modern processors have enough cache to hold this table without
207 thrashing the cache.
208
209 This is the default implementation choice. Choose this one unless
210 you have a good reason not to.
211
212config CRC32_SLICEBY4
213 bool "Slice by 4 bytes"
214 help
215 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
216 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
217 table.
218
219 Only choose this option if you know what you are doing.
220
221config CRC32_SARWATE
222 bool "Sarwate's Algorithm (one byte at a time)"
223 help
224 Calculate checksum a byte at a time using Sarwate's algorithm. This
225 is not particularly fast, but has a small 256 byte lookup table.
226
227 Only choose this option if you know what you are doing.
228
229config CRC32_BIT
230 bool "Classic Algorithm (one bit at a time)"
231 help
232 Calculate checksum one bit at a time. This is VERY slow, but has
233 no lookup table. This is provided as a debugging option.
234
235 Only choose this option if you are debugging crc32.
236
237endchoice
238
239config CRC64
240 tristate "CRC64 functions"
241 help
242 This option is provided for the case where no in-kernel-tree
243 modules require CRC64 functions, but a module built outside
244 the kernel tree does. Such modules that use library CRC64
245 functions require M here.
246
247config CRC4
248 tristate "CRC4 functions"
249 help
250 This option is provided for the case where no in-kernel-tree
251 modules require CRC4 functions, but a module built outside
252 the kernel tree does. Such modules that use library CRC4
253 functions require M here.
254
255config CRC7
256 tristate "CRC7 functions"
257 help
258 This option is provided for the case where no in-kernel-tree
259 modules require CRC7 functions, but a module built outside
260 the kernel tree does. Such modules that use library CRC7
261 functions require M here.
262
263config LIBCRC32C
264 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
265 select CRYPTO
266 select CRYPTO_CRC32C
267 help
268 This option is provided for the case where no in-kernel-tree
269 modules require CRC32c functions, but a module built outside the
270 kernel tree does. Such modules that use library CRC32c functions
271 require M here. See Castagnoli93.
272 Module will be libcrc32c.
273
274config CRC8
275 tristate "CRC8 function"
276 help
277 This option provides CRC8 function. Drivers may select this
278 when they need to do cyclic redundancy check according CRC8
279 algorithm. Module will be called crc8.
280
281config XXHASH
282 tristate
283
284config AUDIT_GENERIC
285 bool
286 depends on AUDIT && !AUDIT_ARCH
287 default y
288
289config AUDIT_ARCH_COMPAT_GENERIC
290 bool
291 default n
292
293config AUDIT_COMPAT_GENERIC
294 bool
295 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
296 default y
297
298config RANDOM32_SELFTEST
299 bool "PRNG perform self test on init"
300 help
301 This option enables the 32 bit PRNG library functions to perform a
302 self test on initialization.
303
304#
305# compression support is select'ed if needed
306#
307config 842_COMPRESS
308 select CRC32
309 tristate
310
311config 842_DECOMPRESS
312 select CRC32
313 tristate
314
315config ZLIB_INFLATE
316 tristate
317
318config ZLIB_DEFLATE
319 tristate
320 select BITREVERSE
321
322config ZLIB_DFLTCC
323 def_bool y
324 depends on S390
325 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
326 help
327 Enable s390x hardware support for zlib in the kernel.
328
329config LZO_COMPRESS
330 tristate
331
332config LZO_DECOMPRESS
333 tristate
334
335config LZ4_COMPRESS
336 tristate
337
338config LZ4HC_COMPRESS
339 tristate
340
341config LZ4_DECOMPRESS
342 tristate
343
344config ZSTD_COMMON
345 select XXHASH
346 tristate
347
348config ZSTD_COMPRESS
349 select ZSTD_COMMON
350 tristate
351
352config ZSTD_DECOMPRESS
353 select ZSTD_COMMON
354 tristate
355
356source "lib/xz/Kconfig"
357
358#
359# These all provide a common interface (hence the apparent duplication with
360# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
361#
362config DECOMPRESS_GZIP
363 select ZLIB_INFLATE
364 tristate
365
366config DECOMPRESS_BZIP2
367 tristate
368
369config DECOMPRESS_LZMA
370 tristate
371
372config DECOMPRESS_XZ
373 select XZ_DEC
374 tristate
375
376config DECOMPRESS_LZO
377 select LZO_DECOMPRESS
378 tristate
379
380config DECOMPRESS_LZ4
381 select LZ4_DECOMPRESS
382 tristate
383
384config DECOMPRESS_ZSTD
385 select ZSTD_DECOMPRESS
386 tristate
387
388#
389# Generic allocator support is selected if needed
390#
391config GENERIC_ALLOCATOR
392 bool
393
394#
395# reed solomon support is select'ed if needed
396#
397config REED_SOLOMON
398 tristate
399
400config REED_SOLOMON_ENC8
401 bool
402
403config REED_SOLOMON_DEC8
404 bool
405
406config REED_SOLOMON_ENC16
407 bool
408
409config REED_SOLOMON_DEC16
410 bool
411
412#
413# BCH support is selected if needed
414#
415config BCH
416 tristate
417
418config BCH_CONST_PARAMS
419 bool
420 help
421 Drivers may select this option to force specific constant
422 values for parameters 'm' (Galois field order) and 't'
423 (error correction capability). Those specific values must
424 be set by declaring default values for symbols BCH_CONST_M
425 and BCH_CONST_T.
426 Doing so will enable extra compiler optimizations,
427 improving encoding and decoding performance up to 2x for
428 usual (m,t) values (typically such that m*t < 200).
429 When this option is selected, the BCH library supports
430 only a single (m,t) configuration. This is mainly useful
431 for NAND flash board drivers requiring known, fixed BCH
432 parameters.
433
434config BCH_CONST_M
435 int
436 range 5 15
437 help
438 Constant value for Galois field order 'm'. If 'k' is the
439 number of data bits to protect, 'm' should be chosen such
440 that (k + m*t) <= 2**m - 1.
441 Drivers should declare a default value for this symbol if
442 they select option BCH_CONST_PARAMS.
443
444config BCH_CONST_T
445 int
446 help
447 Constant value for error correction capability in bits 't'.
448 Drivers should declare a default value for this symbol if
449 they select option BCH_CONST_PARAMS.
450
451#
452# Textsearch support is select'ed if needed
453#
454config TEXTSEARCH
455 bool
456
457config TEXTSEARCH_KMP
458 tristate
459
460config TEXTSEARCH_BM
461 tristate
462
463config TEXTSEARCH_FSM
464 tristate
465
466config BTREE
467 bool
468
469config INTERVAL_TREE
470 bool
471 help
472 Simple, embeddable, interval-tree. Can find the start of an
473 overlapping range in log(n) time and then iterate over all
474 overlapping nodes. The algorithm is implemented as an
475 augmented rbtree.
476
477 See:
478
479 Documentation/core-api/rbtree.rst
480
481 for more information.
482
483config INTERVAL_TREE_SPAN_ITER
484 bool
485 depends on INTERVAL_TREE
486
487config XARRAY_MULTI
488 bool
489 help
490 Support entries which occupy multiple consecutive indices in the
491 XArray.
492
493config ASSOCIATIVE_ARRAY
494 bool
495 help
496 Generic associative array. Can be searched and iterated over whilst
497 it is being modified. It is also reasonably quick to search and
498 modify. The algorithms are non-recursive, and the trees are highly
499 capacious.
500
501 See:
502
503 Documentation/core-api/assoc_array.rst
504
505 for more information.
506
507config HAS_IOMEM
508 bool
509 depends on !NO_IOMEM
510 default y
511
512config HAS_IOPORT_MAP
513 bool
514 depends on HAS_IOMEM && !NO_IOPORT_MAP
515 default y
516
517source "kernel/dma/Kconfig"
518
519config SGL_ALLOC
520 bool
521 default n
522
523config IOMMU_HELPER
524 bool
525
526config CHECK_SIGNATURE
527 bool
528
529config CPUMASK_OFFSTACK
530 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
531 help
532 Use dynamic allocation for cpumask_var_t, instead of putting
533 them on the stack. This is a bit more expensive, but avoids
534 stack overflow.
535
536config FORCE_NR_CPUS
537 bool "Set number of CPUs at compile time"
538 depends on SMP && EXPERT && !COMPILE_TEST
539 help
540 Say Yes if you have NR_CPUS set to an actual number of possible
541 CPUs in your system, not to a default value. This forces the core
542 code to rely on compile-time value and optimize kernel routines
543 better.
544
545config CPU_RMAP
546 bool
547 depends on SMP
548
549config DQL
550 bool
551
552config GLOB
553 bool
554# This actually supports modular compilation, but the module overhead
555# is ridiculous for the amount of code involved. Until an out-of-tree
556# driver asks for it, we'll just link it directly it into the kernel
557# when required. Since we're ignoring out-of-tree users, there's also
558# no need bother prompting for a manual decision:
559# prompt "glob_match() function"
560 help
561 This option provides a glob_match function for performing
562 simple text pattern matching. It originated in the ATA code
563 to blacklist particular drive models, but other device drivers
564 may need similar functionality.
565
566 All drivers in the Linux kernel tree that require this function
567 should automatically select this option. Say N unless you
568 are compiling an out-of tree driver which tells you that it
569 depends on this.
570
571config GLOB_SELFTEST
572 tristate "glob self-test on init"
573 depends on GLOB
574 help
575 This option enables a simple self-test of the glob_match
576 function on startup. It is primarily useful for people
577 working on the code to ensure they haven't introduced any
578 regressions.
579
580 It only adds a little bit of code and slows kernel boot (or
581 module load) by a small amount, so you're welcome to play with
582 it, but you probably don't need it.
583
584#
585# Netlink attribute parsing support is select'ed if needed
586#
587config NLATTR
588 bool
589
590#
591# Generic 64-bit atomic support is selected if needed
592#
593config GENERIC_ATOMIC64
594 bool
595
596config LRU_CACHE
597 tristate
598
599config CLZ_TAB
600 bool
601
602config IRQ_POLL
603 bool "IRQ polling library"
604 help
605 Helper library to poll interrupt mitigation using polling.
606
607config MPILIB
608 tristate
609 select CLZ_TAB
610 help
611 Multiprecision maths library from GnuPG.
612 It is used to implement RSA digital signature verification,
613 which is used by IMA/EVM digital signature extension.
614
615config SIGNATURE
616 tristate
617 depends on KEYS
618 select CRYPTO
619 select CRYPTO_SHA1
620 select MPILIB
621 help
622 Digital signature verification. Currently only RSA is supported.
623 Implementation is done using GnuPG MPI library
624
625config DIMLIB
626 bool
627 help
628 Dynamic Interrupt Moderation library.
629 Implements an algorithm for dynamically changing CQ moderation values
630 according to run time performance.
631
632#
633# libfdt files, only selected if needed.
634#
635config LIBFDT
636 bool
637
638config OID_REGISTRY
639 tristate
640 help
641 Enable fast lookup object identifier registry.
642
643config UCS2_STRING
644 tristate
645
646#
647# generic vdso
648#
649source "lib/vdso/Kconfig"
650
651source "lib/fonts/Kconfig"
652
653config SG_SPLIT
654 def_bool n
655 help
656 Provides a helper to split scatterlists into chunks, each chunk being
657 a scatterlist. This should be selected by a driver or an API which
658 whishes to split a scatterlist amongst multiple DMA channels.
659
660config SG_POOL
661 def_bool n
662 help
663 Provides a helper to allocate chained scatterlists. This should be
664 selected by a driver or an API which whishes to allocate chained
665 scatterlist.
666
667#
668# sg chaining option
669#
670
671config ARCH_NO_SG_CHAIN
672 def_bool n
673
674config ARCH_HAS_PMEM_API
675 bool
676
677config MEMREGION
678 bool
679
680config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
681 bool
682
683config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
684 bool
685
686# use memcpy to implement user copies for nommu architectures
687config UACCESS_MEMCPY
688 bool
689
690config ARCH_HAS_UACCESS_FLUSHCACHE
691 bool
692
693# arch has a concept of a recoverable synchronous exception due to a
694# memory-read error like x86 machine-check or ARM data-abort, and
695# implements copy_mc_to_{user,kernel} to abort and report
696# 'bytes-transferred' if that exception fires when accessing the source
697# buffer.
698config ARCH_HAS_COPY_MC
699 bool
700
701# Temporary. Goes away when all archs are cleaned up
702config ARCH_STACKWALK
703 bool
704
705config STACKDEPOT
706 bool
707 select STACKTRACE
708
709config STACKDEPOT_ALWAYS_INIT
710 bool
711 select STACKDEPOT
712
713config REF_TRACKER
714 bool
715 depends on STACKTRACE_SUPPORT
716 select STACKDEPOT
717
718config SBITMAP
719 bool
720
721config PARMAN
722 tristate "parman" if COMPILE_TEST
723
724config OBJAGG
725 tristate "objagg" if COMPILE_TEST
726
727endmenu
728
729config GENERIC_IOREMAP
730 bool
731
732config GENERIC_LIB_ASHLDI3
733 bool
734
735config GENERIC_LIB_ASHRDI3
736 bool
737
738config GENERIC_LIB_LSHRDI3
739 bool
740
741config GENERIC_LIB_MULDI3
742 bool
743
744config GENERIC_LIB_CMPDI2
745 bool
746
747config GENERIC_LIB_UCMPDI2
748 bool
749
750config GENERIC_LIB_DEVMEM_IS_ALLOWED
751 bool
752
753config PLDMFW
754 bool
755 default n
756
757config ASN1_ENCODER
758 tristate
759
760config POLYNOMIAL
761 tristate