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