1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # Library configuration 3 # Library configuration
4 # 4 #
5 5
6 config BINARY_PRINTF 6 config BINARY_PRINTF
7 def_bool n 7 def_bool n
8 8
9 menu "Library routines" 9 menu "Library routines"
10 10
11 config RAID6_PQ 11 config RAID6_PQ
12 tristate 12 tristate
13 13
14 config RAID6_PQ_BENCHMARK 14 config RAID6_PQ_BENCHMARK
15 bool "Automatically choose fastest RAI 15 bool "Automatically choose fastest RAID6 PQ functions"
16 depends on RAID6_PQ 16 depends on RAID6_PQ
17 default y 17 default y
18 help 18 help
19 Benchmark all available RAID6 PQ fun 19 Benchmark all available RAID6 PQ functions on init and choose the
20 fastest one. 20 fastest one.
21 21
22 config LINEAR_RANGES 22 config LINEAR_RANGES
23 tristate 23 tristate
24 24
25 config PACKING 25 config PACKING
26 bool "Generic bitfield packing and unp 26 bool "Generic bitfield packing and unpacking"
27 select BITREVERSE <<
28 default n 27 default n
29 help 28 help
30 This option provides the packing() h 29 This option provides the packing() helper function, which permits
31 converting bitfields between a CPU-u 30 converting bitfields between a CPU-usable representation and a
32 memory representation that can have 31 memory representation that can have any combination of these quirks:
33 - Is little endian (bytes are reve 32 - Is little endian (bytes are reversed within a 32-bit group)
34 - The least-significant 32-bit wor 33 - The least-significant 32-bit word comes first (within a 64-bit
35 group) 34 group)
36 - The most significant bit of a by 35 - The most significant bit of a byte is at its right (bit 0 of a
37 register description is numerica 36 register description is numerically 2^7).
38 Drivers may use these helpers to mat 37 Drivers may use these helpers to match the bit indices as described
39 in the data sheets of the peripheral 38 in the data sheets of the peripherals they are in control of.
40 39
41 When in doubt, say N. 40 When in doubt, say N.
42 41
43 config BITREVERSE 42 config BITREVERSE
44 tristate 43 tristate
45 44
46 config HAVE_ARCH_BITREVERSE 45 config HAVE_ARCH_BITREVERSE
47 bool 46 bool
48 default n 47 default n
>> 48 depends on BITREVERSE
49 help 49 help
50 This option enables the use of hardw 50 This option enables the use of hardware bit-reversal instructions on
51 architectures which support such ope 51 architectures which support such operations.
52 52
53 config ARCH_HAS_STRNCPY_FROM_USER <<
54 bool <<
55 <<
56 config ARCH_HAS_STRNLEN_USER <<
57 bool <<
58 <<
59 config GENERIC_STRNCPY_FROM_USER 53 config GENERIC_STRNCPY_FROM_USER
60 def_bool !ARCH_HAS_STRNCPY_FROM_USER !! 54 bool
61 55
62 config GENERIC_STRNLEN_USER 56 config GENERIC_STRNLEN_USER
63 def_bool !ARCH_HAS_STRNLEN_USER !! 57 bool
64 58
65 config GENERIC_NET_UTILS 59 config GENERIC_NET_UTILS
66 bool 60 bool
67 61
>> 62 config GENERIC_FIND_FIRST_BIT
>> 63 bool
>> 64
68 source "lib/math/Kconfig" 65 source "lib/math/Kconfig"
69 66
70 config NO_GENERIC_PCI_IOPORT_MAP 67 config NO_GENERIC_PCI_IOPORT_MAP
71 bool 68 bool
72 69
>> 70 config GENERIC_PCI_IOMAP
>> 71 bool
>> 72
73 config GENERIC_IOMAP 73 config GENERIC_IOMAP
74 bool 74 bool
75 select GENERIC_PCI_IOMAP 75 select GENERIC_PCI_IOMAP
76 76
77 config STMP_DEVICE 77 config STMP_DEVICE
78 bool 78 bool
79 79
80 config ARCH_USE_CMPXCHG_LOCKREF 80 config ARCH_USE_CMPXCHG_LOCKREF
81 bool 81 bool
82 82
83 config ARCH_HAS_FAST_MULTIPLIER 83 config ARCH_HAS_FAST_MULTIPLIER
84 bool 84 bool
85 85
86 config ARCH_USE_SYM_ANNOTATIONS 86 config ARCH_USE_SYM_ANNOTATIONS
87 bool 87 bool
88 88
89 config INDIRECT_PIO 89 config INDIRECT_PIO
90 bool "Access I/O in non-MMIO mode" 90 bool "Access I/O in non-MMIO mode"
91 depends on ARM64 91 depends on ARM64
92 depends on HAS_IOPORT <<
93 help 92 help
94 On some platforms where no separate 93 On some platforms where no separate I/O space exists, there are I/O
95 hosts which can not be accessed in M 94 hosts which can not be accessed in MMIO mode. Using the logical PIO
96 mechanism, the host-local I/O resour 95 mechanism, the host-local I/O resource can be mapped into system
97 logic PIO space shared with MMIO hos 96 logic PIO space shared with MMIO hosts, such as PCI/PCIe, then the
98 system can access the I/O devices wi 97 system can access the I/O devices with the mapped-logic PIO through
99 I/O accessors. 98 I/O accessors.
100 99
101 This way has relatively little I/O p 100 This way has relatively little I/O performance cost. Please make
102 sure your devices really need this c 101 sure your devices really need this configure item enabled.
103 102
104 When in doubt, say N. 103 When in doubt, say N.
105 104
106 config INDIRECT_IOMEM <<
107 bool <<
108 help <<
109 This is selected by other options/ar <<
110 emulated iomem accessors. <<
111 <<
112 config INDIRECT_IOMEM_FALLBACK <<
113 bool <<
114 depends on INDIRECT_IOMEM <<
115 help <<
116 If INDIRECT_IOMEM is selected, this <<
117 mmio accesses when the IO memory add <<
118 emulated region. <<
119 <<
120 config TRACE_MMIO_ACCESS <<
121 bool "Register read/write tracing" <<
122 depends on TRACING && ARCH_HAVE_TRACE_ <<
123 help <<
124 Create tracepoints for MMIO read/wri <<
125 can be used for logging all MMIO rea <<
126 <<
127 source "lib/crypto/Kconfig" <<
128 <<
129 config CRC_CCITT 105 config CRC_CCITT
130 tristate "CRC-CCITT functions" 106 tristate "CRC-CCITT functions"
131 help 107 help
132 This option is provided for the case 108 This option is provided for the case where no in-kernel-tree
133 modules require CRC-CCITT functions, 109 modules require CRC-CCITT functions, but a module built outside
134 the kernel tree does. Such modules t 110 the kernel tree does. Such modules that use library CRC-CCITT
135 functions require M here. 111 functions require M here.
136 112
137 config CRC16 113 config CRC16
138 tristate "CRC16 functions" 114 tristate "CRC16 functions"
139 help 115 help
140 This option is provided for the case 116 This option is provided for the case where no in-kernel-tree
141 modules require CRC16 functions, but 117 modules require CRC16 functions, but a module built outside
142 the kernel tree does. Such modules t 118 the kernel tree does. Such modules that use library CRC16
143 functions require M here. 119 functions require M here.
144 120
145 config CRC_T10DIF 121 config CRC_T10DIF
146 tristate "CRC calculation for the T10 122 tristate "CRC calculation for the T10 Data Integrity Field"
147 select CRYPTO 123 select CRYPTO
148 select CRYPTO_CRCT10DIF 124 select CRYPTO_CRCT10DIF
149 help 125 help
150 This option is only needed if a modu 126 This option is only needed if a module that's not in the
151 kernel tree needs to calculate CRC c 127 kernel tree needs to calculate CRC checks for use with the
152 SCSI data integrity subsystem. 128 SCSI data integrity subsystem.
153 129
154 config CRC64_ROCKSOFT <<
155 tristate "CRC calculation for the Rock <<
156 select CRC64 <<
157 select CRYPTO <<
158 select CRYPTO_CRC64_ROCKSOFT <<
159 help <<
160 This option provides a CRC64 API to <<
161 This is used with the block layer's <<
162 <<
163 config CRC_ITU_T 130 config CRC_ITU_T
164 tristate "CRC ITU-T V.41 functions" 131 tristate "CRC ITU-T V.41 functions"
165 help 132 help
166 This option is provided for the case 133 This option is provided for the case where no in-kernel-tree
167 modules require CRC ITU-T V.41 funct 134 modules require CRC ITU-T V.41 functions, but a module built outside
168 the kernel tree does. Such modules t 135 the kernel tree does. Such modules that use library CRC ITU-T V.41
169 functions require M here. 136 functions require M here.
170 137
171 config CRC32 138 config CRC32
172 tristate "CRC32/CRC32c functions" 139 tristate "CRC32/CRC32c functions"
173 default y 140 default y
174 select BITREVERSE 141 select BITREVERSE
175 help 142 help
176 This option is provided for the case 143 This option is provided for the case where no in-kernel-tree
177 modules require CRC32/CRC32c functio 144 modules require CRC32/CRC32c functions, but a module built outside
178 the kernel tree does. Such modules t 145 the kernel tree does. Such modules that use library CRC32/CRC32c
179 functions require M here. 146 functions require M here.
180 147
181 config CRC32_SELFTEST 148 config CRC32_SELFTEST
182 tristate "CRC32 perform self test on i 149 tristate "CRC32 perform self test on init"
183 depends on CRC32 150 depends on CRC32
184 help 151 help
185 This option enables the CRC32 librar 152 This option enables the CRC32 library functions to perform a
186 self test on initialization. The sel 153 self test on initialization. The self test computes crc32_le
187 and crc32_be over byte strings with 154 and crc32_be over byte strings with random alignment and length
188 and computes the total elapsed time 155 and computes the total elapsed time and number of bytes processed.
189 156
190 choice 157 choice
191 prompt "CRC32 implementation" 158 prompt "CRC32 implementation"
192 depends on CRC32 159 depends on CRC32
193 default CRC32_SLICEBY8 160 default CRC32_SLICEBY8
194 help 161 help
195 This option allows a kernel builder 162 This option allows a kernel builder to override the default choice
196 of CRC32 algorithm. Choose the defa 163 of CRC32 algorithm. Choose the default ("slice by 8") unless you
197 know that you need one of the others 164 know that you need one of the others.
198 165
199 config CRC32_SLICEBY8 166 config CRC32_SLICEBY8
200 bool "Slice by 8 bytes" 167 bool "Slice by 8 bytes"
201 help 168 help
202 Calculate checksum 8 bytes at a time 169 Calculate checksum 8 bytes at a time with a clever slicing algorithm.
203 This is the fastest algorithm, but c 170 This is the fastest algorithm, but comes with a 8KiB lookup table.
204 Most modern processors have enough c 171 Most modern processors have enough cache to hold this table without
205 thrashing the cache. 172 thrashing the cache.
206 173
207 This is the default implementation c 174 This is the default implementation choice. Choose this one unless
208 you have a good reason not to. 175 you have a good reason not to.
209 176
210 config CRC32_SLICEBY4 177 config CRC32_SLICEBY4
211 bool "Slice by 4 bytes" 178 bool "Slice by 4 bytes"
212 help 179 help
213 Calculate checksum 4 bytes at a time 180 Calculate checksum 4 bytes at a time with a clever slicing algorithm.
214 This is a bit slower than slice by 8 181 This is a bit slower than slice by 8, but has a smaller 4KiB lookup
215 table. 182 table.
216 183
217 Only choose this option if you know 184 Only choose this option if you know what you are doing.
218 185
219 config CRC32_SARWATE 186 config CRC32_SARWATE
220 bool "Sarwate's Algorithm (one byte at 187 bool "Sarwate's Algorithm (one byte at a time)"
221 help 188 help
222 Calculate checksum a byte at a time 189 Calculate checksum a byte at a time using Sarwate's algorithm. This
223 is not particularly fast, but has a 190 is not particularly fast, but has a small 256 byte lookup table.
224 191
225 Only choose this option if you know 192 Only choose this option if you know what you are doing.
226 193
227 config CRC32_BIT 194 config CRC32_BIT
228 bool "Classic Algorithm (one bit at a 195 bool "Classic Algorithm (one bit at a time)"
229 help 196 help
230 Calculate checksum one bit at a time 197 Calculate checksum one bit at a time. This is VERY slow, but has
231 no lookup table. This is provided a 198 no lookup table. This is provided as a debugging option.
232 199
233 Only choose this option if you are d 200 Only choose this option if you are debugging crc32.
234 201
235 endchoice 202 endchoice
236 203
237 config CRC64 204 config CRC64
238 tristate "CRC64 functions" 205 tristate "CRC64 functions"
239 help 206 help
240 This option is provided for the case 207 This option is provided for the case where no in-kernel-tree
241 modules require CRC64 functions, but 208 modules require CRC64 functions, but a module built outside
242 the kernel tree does. Such modules t 209 the kernel tree does. Such modules that use library CRC64
243 functions require M here. 210 functions require M here.
244 211
245 config CRC4 212 config CRC4
246 tristate "CRC4 functions" 213 tristate "CRC4 functions"
247 help 214 help
248 This option is provided for the case 215 This option is provided for the case where no in-kernel-tree
249 modules require CRC4 functions, but 216 modules require CRC4 functions, but a module built outside
250 the kernel tree does. Such modules t 217 the kernel tree does. Such modules that use library CRC4
251 functions require M here. 218 functions require M here.
252 219
253 config CRC7 220 config CRC7
254 tristate "CRC7 functions" 221 tristate "CRC7 functions"
255 help 222 help
256 This option is provided for the case 223 This option is provided for the case where no in-kernel-tree
257 modules require CRC7 functions, but 224 modules require CRC7 functions, but a module built outside
258 the kernel tree does. Such modules t 225 the kernel tree does. Such modules that use library CRC7
259 functions require M here. 226 functions require M here.
260 227
261 config LIBCRC32C 228 config LIBCRC32C
262 tristate "CRC32c (Castagnoli, et al) C 229 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
263 select CRYPTO 230 select CRYPTO
264 select CRYPTO_CRC32C 231 select CRYPTO_CRC32C
265 help 232 help
266 This option is provided for the case 233 This option is provided for the case where no in-kernel-tree
267 modules require CRC32c functions, bu 234 modules require CRC32c functions, but a module built outside the
268 kernel tree does. Such modules that 235 kernel tree does. Such modules that use library CRC32c functions
269 require M here. See Castagnoli93. 236 require M here. See Castagnoli93.
270 Module will be libcrc32c. 237 Module will be libcrc32c.
271 238
272 config CRC8 239 config CRC8
273 tristate "CRC8 function" 240 tristate "CRC8 function"
274 help 241 help
275 This option provides CRC8 function. 242 This option provides CRC8 function. Drivers may select this
276 when they need to do cyclic redundan 243 when they need to do cyclic redundancy check according CRC8
277 algorithm. Module will be called crc 244 algorithm. Module will be called crc8.
278 245
279 config XXHASH 246 config XXHASH
280 tristate 247 tristate
281 248
282 config AUDIT_GENERIC 249 config AUDIT_GENERIC
283 bool 250 bool
284 depends on AUDIT && !AUDIT_ARCH 251 depends on AUDIT && !AUDIT_ARCH
285 default y 252 default y
286 253
287 config AUDIT_ARCH_COMPAT_GENERIC 254 config AUDIT_ARCH_COMPAT_GENERIC
288 bool 255 bool
289 default n 256 default n
290 257
291 config AUDIT_COMPAT_GENERIC 258 config AUDIT_COMPAT_GENERIC
292 bool 259 bool
293 depends on AUDIT_GENERIC && AUDIT_ARCH 260 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
294 default y 261 default y
295 262
296 config RANDOM32_SELFTEST 263 config RANDOM32_SELFTEST
297 bool "PRNG perform self test on init" 264 bool "PRNG perform self test on init"
298 help 265 help
299 This option enables the 32 bit PRNG 266 This option enables the 32 bit PRNG library functions to perform a
300 self test on initialization. 267 self test on initialization.
301 268
302 # 269 #
303 # compression support is select'ed if needed 270 # compression support is select'ed if needed
304 # 271 #
305 config 842_COMPRESS 272 config 842_COMPRESS
306 select CRC32 273 select CRC32
307 tristate 274 tristate
308 275
309 config 842_DECOMPRESS 276 config 842_DECOMPRESS
310 select CRC32 277 select CRC32
311 tristate 278 tristate
312 279
313 config ZLIB_INFLATE 280 config ZLIB_INFLATE
314 tristate 281 tristate
315 282
316 config ZLIB_DEFLATE 283 config ZLIB_DEFLATE
317 tristate 284 tristate
318 select BITREVERSE 285 select BITREVERSE
319 286
320 config ZLIB_DFLTCC 287 config ZLIB_DFLTCC
321 def_bool y 288 def_bool y
322 depends on S390 289 depends on S390
323 prompt "Enable s390x DEFLATE CONVERSIO 290 prompt "Enable s390x DEFLATE CONVERSION CALL support for kernel zlib"
324 help 291 help
325 Enable s390x hardware support for zli 292 Enable s390x hardware support for zlib in the kernel.
326 293
327 config LZO_COMPRESS 294 config LZO_COMPRESS
328 tristate 295 tristate
329 296
330 config LZO_DECOMPRESS 297 config LZO_DECOMPRESS
331 tristate 298 tristate
332 299
333 config LZ4_COMPRESS 300 config LZ4_COMPRESS
334 tristate 301 tristate
335 302
336 config LZ4HC_COMPRESS 303 config LZ4HC_COMPRESS
337 tristate 304 tristate
338 305
339 config LZ4_DECOMPRESS 306 config LZ4_DECOMPRESS
340 tristate 307 tristate
341 308
342 config ZSTD_COMMON <<
343 select XXHASH <<
344 tristate <<
345 <<
346 config ZSTD_COMPRESS 309 config ZSTD_COMPRESS
347 select ZSTD_COMMON !! 310 select XXHASH
348 tristate 311 tristate
349 312
350 config ZSTD_DECOMPRESS 313 config ZSTD_DECOMPRESS
351 select ZSTD_COMMON !! 314 select XXHASH
352 tristate 315 tristate
353 316
354 source "lib/xz/Kconfig" 317 source "lib/xz/Kconfig"
355 318
356 # 319 #
357 # These all provide a common interface (hence 320 # These all provide a common interface (hence the apparent duplication with
358 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrap 321 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
359 # 322 #
360 config DECOMPRESS_GZIP 323 config DECOMPRESS_GZIP
361 select ZLIB_INFLATE 324 select ZLIB_INFLATE
362 tristate 325 tristate
363 326
364 config DECOMPRESS_BZIP2 327 config DECOMPRESS_BZIP2
365 tristate 328 tristate
366 329
367 config DECOMPRESS_LZMA 330 config DECOMPRESS_LZMA
368 tristate 331 tristate
369 332
370 config DECOMPRESS_XZ 333 config DECOMPRESS_XZ
371 select XZ_DEC 334 select XZ_DEC
372 tristate 335 tristate
373 336
374 config DECOMPRESS_LZO 337 config DECOMPRESS_LZO
375 select LZO_DECOMPRESS 338 select LZO_DECOMPRESS
376 tristate 339 tristate
377 340
378 config DECOMPRESS_LZ4 341 config DECOMPRESS_LZ4
379 select LZ4_DECOMPRESS 342 select LZ4_DECOMPRESS
380 tristate 343 tristate
381 344
382 config DECOMPRESS_ZSTD 345 config DECOMPRESS_ZSTD
383 select ZSTD_DECOMPRESS 346 select ZSTD_DECOMPRESS
384 tristate 347 tristate
385 348
386 # 349 #
387 # Generic allocator support is selected if nee 350 # Generic allocator support is selected if needed
388 # 351 #
389 config GENERIC_ALLOCATOR 352 config GENERIC_ALLOCATOR
390 bool 353 bool
391 354
392 # 355 #
393 # reed solomon support is select'ed if needed 356 # reed solomon support is select'ed if needed
394 # 357 #
395 config REED_SOLOMON 358 config REED_SOLOMON
396 tristate 359 tristate
397 360
398 config REED_SOLOMON_ENC8 361 config REED_SOLOMON_ENC8
399 bool 362 bool
400 363
401 config REED_SOLOMON_DEC8 364 config REED_SOLOMON_DEC8
402 bool 365 bool
403 366
404 config REED_SOLOMON_ENC16 367 config REED_SOLOMON_ENC16
405 bool 368 bool
406 369
407 config REED_SOLOMON_DEC16 370 config REED_SOLOMON_DEC16
408 bool 371 bool
409 372
410 # 373 #
411 # BCH support is selected if needed 374 # BCH support is selected if needed
412 # 375 #
413 config BCH 376 config BCH
414 tristate 377 tristate
415 select BITREVERSE <<
416 378
417 config BCH_CONST_PARAMS 379 config BCH_CONST_PARAMS
418 bool 380 bool
419 help 381 help
420 Drivers may select this option to fo 382 Drivers may select this option to force specific constant
421 values for parameters 'm' (Galois fi 383 values for parameters 'm' (Galois field order) and 't'
422 (error correction capability). Those 384 (error correction capability). Those specific values must
423 be set by declaring default values f 385 be set by declaring default values for symbols BCH_CONST_M
424 and BCH_CONST_T. 386 and BCH_CONST_T.
425 Doing so will enable extra compiler 387 Doing so will enable extra compiler optimizations,
426 improving encoding and decoding perf 388 improving encoding and decoding performance up to 2x for
427 usual (m,t) values (typically such t 389 usual (m,t) values (typically such that m*t < 200).
428 When this option is selected, the BC 390 When this option is selected, the BCH library supports
429 only a single (m,t) configuration. T 391 only a single (m,t) configuration. This is mainly useful
430 for NAND flash board drivers requiri 392 for NAND flash board drivers requiring known, fixed BCH
431 parameters. 393 parameters.
432 394
433 config BCH_CONST_M 395 config BCH_CONST_M
434 int 396 int
435 range 5 15 397 range 5 15
436 help 398 help
437 Constant value for Galois field orde 399 Constant value for Galois field order 'm'. If 'k' is the
438 number of data bits to protect, 'm' 400 number of data bits to protect, 'm' should be chosen such
439 that (k + m*t) <= 2**m - 1. 401 that (k + m*t) <= 2**m - 1.
440 Drivers should declare a default val 402 Drivers should declare a default value for this symbol if
441 they select option BCH_CONST_PARAMS. 403 they select option BCH_CONST_PARAMS.
442 404
443 config BCH_CONST_T 405 config BCH_CONST_T
444 int 406 int
445 help 407 help
446 Constant value for error correction 408 Constant value for error correction capability in bits 't'.
447 Drivers should declare a default val 409 Drivers should declare a default value for this symbol if
448 they select option BCH_CONST_PARAMS. 410 they select option BCH_CONST_PARAMS.
449 411
450 # 412 #
451 # Textsearch support is select'ed if needed 413 # Textsearch support is select'ed if needed
452 # 414 #
453 config TEXTSEARCH 415 config TEXTSEARCH
454 bool 416 bool
455 417
456 config TEXTSEARCH_KMP 418 config TEXTSEARCH_KMP
457 tristate 419 tristate
458 420
459 config TEXTSEARCH_BM 421 config TEXTSEARCH_BM
460 tristate 422 tristate
461 423
462 config TEXTSEARCH_FSM 424 config TEXTSEARCH_FSM
463 tristate 425 tristate
464 426
465 config BTREE 427 config BTREE
466 bool 428 bool
467 429
468 config INTERVAL_TREE 430 config INTERVAL_TREE
469 bool 431 bool
470 help 432 help
471 Simple, embeddable, interval-tree. C 433 Simple, embeddable, interval-tree. Can find the start of an
472 overlapping range in log(n) time and 434 overlapping range in log(n) time and then iterate over all
473 overlapping nodes. The algorithm is 435 overlapping nodes. The algorithm is implemented as an
474 augmented rbtree. 436 augmented rbtree.
475 437
476 See: 438 See:
477 439
478 Documentation/core-api/rbtree. 440 Documentation/core-api/rbtree.rst
479 441
480 for more information. 442 for more information.
481 443
482 config INTERVAL_TREE_SPAN_ITER <<
483 bool <<
484 depends on INTERVAL_TREE <<
485 <<
486 config XARRAY_MULTI 444 config XARRAY_MULTI
487 bool 445 bool
488 help 446 help
489 Support entries which occupy multipl 447 Support entries which occupy multiple consecutive indices in the
490 XArray. 448 XArray.
491 449
492 config ASSOCIATIVE_ARRAY 450 config ASSOCIATIVE_ARRAY
493 bool 451 bool
494 help 452 help
495 Generic associative array. Can be s 453 Generic associative array. Can be searched and iterated over whilst
496 it is being modified. It is also re 454 it is being modified. It is also reasonably quick to search and
497 modify. The algorithms are non-recu 455 modify. The algorithms are non-recursive, and the trees are highly
498 capacious. 456 capacious.
499 457
500 See: 458 See:
501 459
502 Documentation/core-api/assoc_a 460 Documentation/core-api/assoc_array.rst
503 461
504 for more information. 462 for more information.
505 463
506 config CLOSURES <<
507 bool <<
508 <<
509 config HAS_IOMEM 464 config HAS_IOMEM
510 bool 465 bool
511 depends on !NO_IOMEM 466 depends on !NO_IOMEM
512 default y 467 default y
513 468
514 config HAS_IOPORT <<
515 bool <<
516 <<
517 config HAS_IOPORT_MAP 469 config HAS_IOPORT_MAP
518 bool 470 bool
519 depends on HAS_IOMEM && !NO_IOPORT_MAP 471 depends on HAS_IOMEM && !NO_IOPORT_MAP
520 default y 472 default y
521 473
522 source "kernel/dma/Kconfig" 474 source "kernel/dma/Kconfig"
523 475
524 config SGL_ALLOC 476 config SGL_ALLOC
525 bool 477 bool
526 default n 478 default n
527 479
528 config IOMMU_HELPER 480 config IOMMU_HELPER
529 bool 481 bool
530 482
531 config CHECK_SIGNATURE 483 config CHECK_SIGNATURE
532 bool 484 bool
533 485
534 config CPUMASK_OFFSTACK 486 config CPUMASK_OFFSTACK
535 bool "Force CPU masks off stack" if DE 487 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
536 help 488 help
537 Use dynamic allocation for cpumask_v 489 Use dynamic allocation for cpumask_var_t, instead of putting
538 them on the stack. This is a bit mo 490 them on the stack. This is a bit more expensive, but avoids
539 stack overflow. 491 stack overflow.
540 492
541 config FORCE_NR_CPUS <<
542 def_bool !SMP <<
543 <<
544 config CPU_RMAP 493 config CPU_RMAP
545 bool 494 bool
546 depends on SMP 495 depends on SMP
547 496
548 config DQL 497 config DQL
549 bool 498 bool
550 499
551 config GLOB 500 config GLOB
552 bool 501 bool
553 # This actually supports modular compila 502 # This actually supports modular compilation, but the module overhead
554 # is ridiculous for the amount of code i 503 # is ridiculous for the amount of code involved. Until an out-of-tree
555 # driver asks for it, we'll just link it 504 # driver asks for it, we'll just link it directly it into the kernel
556 # when required. Since we're ignoring o 505 # when required. Since we're ignoring out-of-tree users, there's also
557 # no need bother prompting for a manual 506 # no need bother prompting for a manual decision:
558 # prompt "glob_match() function" 507 # prompt "glob_match() function"
559 help 508 help
560 This option provides a glob_match fu 509 This option provides a glob_match function for performing
561 simple text pattern matching. It or 510 simple text pattern matching. It originated in the ATA code
562 to blacklist particular drive models 511 to blacklist particular drive models, but other device drivers
563 may need similar functionality. 512 may need similar functionality.
564 513
565 All drivers in the Linux kernel tree 514 All drivers in the Linux kernel tree that require this function
566 should automatically select this opt 515 should automatically select this option. Say N unless you
567 are compiling an out-of tree driver 516 are compiling an out-of tree driver which tells you that it
568 depends on this. 517 depends on this.
569 518
570 config GLOB_SELFTEST 519 config GLOB_SELFTEST
571 tristate "glob self-test on init" 520 tristate "glob self-test on init"
572 depends on GLOB 521 depends on GLOB
573 help 522 help
574 This option enables a simple self-te 523 This option enables a simple self-test of the glob_match
575 function on startup. It is primaril 524 function on startup. It is primarily useful for people
576 working on the code to ensure they h 525 working on the code to ensure they haven't introduced any
577 regressions. 526 regressions.
578 527
579 It only adds a little bit of code an 528 It only adds a little bit of code and slows kernel boot (or
580 module load) by a small amount, so y 529 module load) by a small amount, so you're welcome to play with
581 it, but you probably don't need it. 530 it, but you probably don't need it.
582 531
583 # 532 #
584 # Netlink attribute parsing support is select' 533 # Netlink attribute parsing support is select'ed if needed
585 # 534 #
586 config NLATTR 535 config NLATTR
587 bool 536 bool
588 537
589 # 538 #
590 # Generic 64-bit atomic support is selected if 539 # Generic 64-bit atomic support is selected if needed
591 # 540 #
592 config GENERIC_ATOMIC64 541 config GENERIC_ATOMIC64
593 bool 542 bool
594 543
595 config LRU_CACHE 544 config LRU_CACHE
596 tristate 545 tristate
597 546
598 config CLZ_TAB 547 config CLZ_TAB
599 bool 548 bool
600 549
601 config IRQ_POLL 550 config IRQ_POLL
602 bool "IRQ polling library" 551 bool "IRQ polling library"
603 help 552 help
604 Helper library to poll interrupt mit 553 Helper library to poll interrupt mitigation using polling.
605 554
606 config MPILIB 555 config MPILIB
607 tristate 556 tristate
608 select CLZ_TAB 557 select CLZ_TAB
609 help 558 help
610 Multiprecision maths library from Gn 559 Multiprecision maths library from GnuPG.
611 It is used to implement RSA digital 560 It is used to implement RSA digital signature verification,
612 which is used by IMA/EVM digital sig 561 which is used by IMA/EVM digital signature extension.
613 562
614 config SIGNATURE 563 config SIGNATURE
615 tristate 564 tristate
616 depends on KEYS 565 depends on KEYS
617 select CRYPTO 566 select CRYPTO
618 select CRYPTO_SHA1 567 select CRYPTO_SHA1
619 select MPILIB 568 select MPILIB
620 help 569 help
621 Digital signature verification. Curr 570 Digital signature verification. Currently only RSA is supported.
622 Implementation is done using GnuPG M 571 Implementation is done using GnuPG MPI library
623 572
624 config DIMLIB 573 config DIMLIB
625 tristate !! 574 bool
626 depends on NET <<
627 help 575 help
628 Dynamic Interrupt Moderation library 576 Dynamic Interrupt Moderation library.
629 Implements an algorithm for dynamica 577 Implements an algorithm for dynamically changing CQ moderation values
630 according to run time performance. 578 according to run time performance.
631 579
632 # 580 #
633 # libfdt files, only selected if needed. 581 # libfdt files, only selected if needed.
634 # 582 #
635 config LIBFDT 583 config LIBFDT
636 bool 584 bool
637 585
638 config OID_REGISTRY 586 config OID_REGISTRY
639 tristate 587 tristate
640 help 588 help
641 Enable fast lookup object identifier 589 Enable fast lookup object identifier registry.
642 590
643 config UCS2_STRING 591 config UCS2_STRING
644 tristate 592 tristate
645 593
646 # 594 #
647 # generic vdso 595 # generic vdso
648 # 596 #
649 source "lib/vdso/Kconfig" 597 source "lib/vdso/Kconfig"
650 598
651 source "lib/fonts/Kconfig" 599 source "lib/fonts/Kconfig"
652 600
653 config SG_SPLIT 601 config SG_SPLIT
654 def_bool n 602 def_bool n
655 help 603 help
656 Provides a helper to split scatterlis 604 Provides a helper to split scatterlists into chunks, each chunk being
657 a scatterlist. This should be selecte 605 a scatterlist. This should be selected by a driver or an API which
658 whishes to split a scatterlist amongs 606 whishes to split a scatterlist amongst multiple DMA channels.
659 607
660 config SG_POOL 608 config SG_POOL
661 def_bool n 609 def_bool n
662 help 610 help
663 Provides a helper to allocate chained 611 Provides a helper to allocate chained scatterlists. This should be
664 selected by a driver or an API which 612 selected by a driver or an API which whishes to allocate chained
665 scatterlist. 613 scatterlist.
666 614
667 # 615 #
668 # sg chaining option 616 # sg chaining option
669 # 617 #
670 618
671 config ARCH_NO_SG_CHAIN 619 config ARCH_NO_SG_CHAIN
672 def_bool n 620 def_bool n
673 621
674 config ARCH_HAS_PMEM_API 622 config ARCH_HAS_PMEM_API
675 bool 623 bool
676 624
677 config MEMREGION 625 config MEMREGION
678 bool 626 bool
679 627
680 config ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION <<
681 bool <<
682 <<
683 config ARCH_HAS_MEMREMAP_COMPAT_ALIGN 628 config ARCH_HAS_MEMREMAP_COMPAT_ALIGN
684 bool 629 bool
685 630
686 # use memcpy to implement user copies for nomm 631 # use memcpy to implement user copies for nommu architectures
687 config UACCESS_MEMCPY 632 config UACCESS_MEMCPY
688 bool 633 bool
689 634
690 config ARCH_HAS_UACCESS_FLUSHCACHE 635 config ARCH_HAS_UACCESS_FLUSHCACHE
691 bool 636 bool
692 637
693 # arch has a concept of a recoverable synchron 638 # arch has a concept of a recoverable synchronous exception due to a
694 # memory-read error like x86 machine-check or 639 # memory-read error like x86 machine-check or ARM data-abort, and
695 # implements copy_mc_to_{user,kernel} to abort 640 # implements copy_mc_to_{user,kernel} to abort and report
696 # 'bytes-transferred' if that exception fires 641 # 'bytes-transferred' if that exception fires when accessing the source
697 # buffer. 642 # buffer.
698 config ARCH_HAS_COPY_MC 643 config ARCH_HAS_COPY_MC
699 bool 644 bool
700 645
701 # Temporary. Goes away when all archs are clea 646 # Temporary. Goes away when all archs are cleaned up
702 config ARCH_STACKWALK 647 config ARCH_STACKWALK
703 bool 648 bool
704 649
705 config STACKDEPOT 650 config STACKDEPOT
706 bool 651 bool
707 select STACKTRACE 652 select STACKTRACE
708 help <<
709 Stack depot: stack trace storage tha <<
710 653
711 config STACKDEPOT_ALWAYS_INIT !! 654 config STACK_HASH_ORDER
712 bool !! 655 int "stack depot hash size (12 => 4KB, 20 => 1024KB)"
713 select STACKDEPOT !! 656 range 12 20
714 help !! 657 default 20
715 Always initialize stack depot during <<
716 <<
717 config STACKDEPOT_MAX_FRAMES <<
718 int "Maximum number of frames in trace <<
719 range 1 256 <<
720 default 64 <<
721 depends on STACKDEPOT 658 depends on STACKDEPOT
722 !! 659 help
723 config REF_TRACKER !! 660 Select the hash size as a power of 2 for the stackdepot hash table.
724 bool !! 661 Choose a lower value to reduce the memory impact.
725 depends on STACKTRACE_SUPPORT <<
726 select STACKDEPOT <<
727 662
728 config SBITMAP 663 config SBITMAP
729 bool 664 bool
730 665
731 config PARMAN 666 config PARMAN
732 tristate "parman" if COMPILE_TEST 667 tristate "parman" if COMPILE_TEST
733 668
734 config OBJAGG 669 config OBJAGG
735 tristate "objagg" if COMPILE_TEST 670 tristate "objagg" if COMPILE_TEST
736 671
737 config LWQ_TEST !! 672 config STRING_SELFTEST
738 bool "Boot-time test for lwq queuing" !! 673 tristate "Test string functions"
739 help <<
740 Run boot-time test of light-weight q <<
741 674
742 endmenu 675 endmenu
743 676
744 config GENERIC_IOREMAP 677 config GENERIC_IOREMAP
745 bool 678 bool
746 679
747 config GENERIC_LIB_ASHLDI3 680 config GENERIC_LIB_ASHLDI3
748 bool 681 bool
749 682
750 config GENERIC_LIB_ASHRDI3 683 config GENERIC_LIB_ASHRDI3
751 bool 684 bool
752 685
753 config GENERIC_LIB_LSHRDI3 686 config GENERIC_LIB_LSHRDI3
754 bool 687 bool
755 688
756 config GENERIC_LIB_MULDI3 689 config GENERIC_LIB_MULDI3
757 bool 690 bool
758 691
759 config GENERIC_LIB_CMPDI2 692 config GENERIC_LIB_CMPDI2
760 bool 693 bool
761 694
762 config GENERIC_LIB_UCMPDI2 695 config GENERIC_LIB_UCMPDI2
763 bool 696 bool
764 697
765 config GENERIC_LIB_DEVMEM_IS_ALLOWED 698 config GENERIC_LIB_DEVMEM_IS_ALLOWED
766 bool 699 bool
767 700
768 config PLDMFW 701 config PLDMFW
769 bool 702 bool
770 default n 703 default n
771 704
772 config ASN1_ENCODER 705 config ASN1_ENCODER
773 tristate 706 tristate
774 <<
775 config POLYNOMIAL <<
776 tristate <<
777 <<
778 config FIRMWARE_TABLE <<
779 bool <<
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