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