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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 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