1# 2# Library configuration 3# 4 5config BINARY_PRINTF 6 def_bool n 7 8menu "Library routines" 9 10config RAID6_PQ 11 tristate 12 13config BITREVERSE 14 tristate 15 16config HAVE_ARCH_BITREVERSE 17 bool 18 default n 19 depends on BITREVERSE 20 help 21 This option enables the use of hardware bit-reversal instructions on 22 architectures which support such operations. 23 24config RATIONAL 25 bool 26 27config GENERIC_STRNCPY_FROM_USER 28 bool 29 30config GENERIC_STRNLEN_USER 31 bool 32 33config GENERIC_NET_UTILS 34 bool 35 36config GENERIC_FIND_FIRST_BIT 37 bool 38 39config NO_GENERIC_PCI_IOPORT_MAP 40 bool 41 42config GENERIC_PCI_IOMAP 43 bool 44 45config GENERIC_IOMAP 46 bool 47 select GENERIC_PCI_IOMAP 48 49config GENERIC_IO 50 bool 51 default n 52 53config STMP_DEVICE 54 bool 55 56config ARCH_USE_CMPXCHG_LOCKREF 57 bool 58 59config ARCH_HAS_FAST_MULTIPLIER 60 bool 61 62config CRC_CCITT 63 tristate "CRC-CCITT functions" 64 help 65 This option is provided for the case where no in-kernel-tree 66 modules require CRC-CCITT functions, but a module built outside 67 the kernel tree does. Such modules that use library CRC-CCITT 68 functions require M here. 69 70config CRC16 71 tristate "CRC16 functions" 72 help 73 This option is provided for the case where no in-kernel-tree 74 modules require CRC16 functions, but a module built outside 75 the kernel tree does. Such modules that use library CRC16 76 functions require M here. 77 78config CRC_T10DIF 79 tristate "CRC calculation for the T10 Data Integrity Field" 80 select CRYPTO 81 select CRYPTO_CRCT10DIF 82 help 83 This option is only needed if a module that's not in the 84 kernel tree needs to calculate CRC checks for use with the 85 SCSI data integrity subsystem. 86 87config CRC_ITU_T 88 tristate "CRC ITU-T V.41 functions" 89 help 90 This option is provided for the case where no in-kernel-tree 91 modules require CRC ITU-T V.41 functions, but a module built outside 92 the kernel tree does. Such modules that use library CRC ITU-T V.41 93 functions require M here. 94 95config CRC32 96 tristate "CRC32/CRC32c functions" 97 default y 98 select BITREVERSE 99 help 100 This option is provided for the case where no in-kernel-tree 101 modules require CRC32/CRC32c functions, but a module built outside 102 the kernel tree does. Such modules that use library CRC32/CRC32c 103 functions require M here. 104 105config CRC32_SELFTEST 106 tristate "CRC32 perform self test on init" 107 depends on CRC32 108 help 109 This option enables the CRC32 library functions to perform a 110 self test on initialization. The self test computes crc32_le 111 and crc32_be over byte strings with random alignment and length 112 and computes the total elapsed time and number of bytes processed. 113 114choice 115 prompt "CRC32 implementation" 116 depends on CRC32 117 default CRC32_SLICEBY8 118 help 119 This option allows a kernel builder to override the default choice 120 of CRC32 algorithm. Choose the default ("slice by 8") unless you 121 know that you need one of the others. 122 123config CRC32_SLICEBY8 124 bool "Slice by 8 bytes" 125 help 126 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 127 This is the fastest algorithm, but comes with a 8KiB lookup table. 128 Most modern processors have enough cache to hold this table without 129 thrashing the cache. 130 131 This is the default implementation choice. Choose this one unless 132 you have a good reason not to. 133 134config CRC32_SLICEBY4 135 bool "Slice by 4 bytes" 136 help 137 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 138 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 139 table. 140 141 Only choose this option if you know what you are doing. 142 143config CRC32_SARWATE 144 bool "Sarwate's Algorithm (one byte at a time)" 145 help 146 Calculate checksum a byte at a time using Sarwate's algorithm. This 147 is not particularly fast, but has a small 256 byte lookup table. 148 149 Only choose this option if you know what you are doing. 150 151config CRC32_BIT 152 bool "Classic Algorithm (one bit at a time)" 153 help 154 Calculate checksum one bit at a time. This is VERY slow, but has 155 no lookup table. This is provided as a debugging option. 156 157 Only choose this option if you are debugging crc32. 158 159endchoice 160 161config CRC4 162 tristate "CRC4 functions" 163 help 164 This option is provided for the case where no in-kernel-tree 165 modules require CRC4 functions, but a module built outside 166 the kernel tree does. Such modules that use library CRC4 167 functions require M here. 168 169config CRC7 170 tristate "CRC7 functions" 171 help 172 This option is provided for the case where no in-kernel-tree 173 modules require CRC7 functions, but a module built outside 174 the kernel tree does. Such modules that use library CRC7 175 functions require M here. 176 177config LIBCRC32C 178 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 179 select CRYPTO 180 select CRYPTO_CRC32C 181 help 182 This option is provided for the case where no in-kernel-tree 183 modules require CRC32c functions, but a module built outside the 184 kernel tree does. Such modules that use library CRC32c functions 185 require M here. See Castagnoli93. 186 Module will be libcrc32c. 187 188config CRC8 189 tristate "CRC8 function" 190 help 191 This option provides CRC8 function. Drivers may select this 192 when they need to do cyclic redundancy check according CRC8 193 algorithm. Module will be called crc8. 194 195config XXHASH 196 tristate 197 198config AUDIT_GENERIC 199 bool 200 depends on AUDIT && !AUDIT_ARCH 201 default y 202 203config AUDIT_ARCH_COMPAT_GENERIC 204 bool 205 default n 206 207config AUDIT_COMPAT_GENERIC 208 bool 209 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 210 default y 211 212config RANDOM32_SELFTEST 213 bool "PRNG perform self test on init" 214 default n 215 help 216 This option enables the 32 bit PRNG library functions to perform a 217 self test on initialization. 218 219# 220# compression support is select'ed if needed 221# 222config 842_COMPRESS 223 select CRC32 224 tristate 225 226config 842_DECOMPRESS 227 select CRC32 228 tristate 229 230config ZLIB_INFLATE 231 tristate 232 233config ZLIB_DEFLATE 234 tristate 235 select BITREVERSE 236 237config LZO_COMPRESS 238 tristate 239 240config LZO_DECOMPRESS 241 tristate 242 243config LZ4_COMPRESS 244 tristate 245 246config LZ4HC_COMPRESS 247 tristate 248 249config LZ4_DECOMPRESS 250 tristate 251 252config ZSTD_COMPRESS 253 select XXHASH 254 tristate 255 256config ZSTD_DECOMPRESS 257 select XXHASH 258 tristate 259 260source "lib/xz/Kconfig" 261 262# 263# These all provide a common interface (hence the apparent duplication with 264# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 265# 266config DECOMPRESS_GZIP 267 select ZLIB_INFLATE 268 tristate 269 270config DECOMPRESS_BZIP2 271 tristate 272 273config DECOMPRESS_LZMA 274 tristate 275 276config DECOMPRESS_XZ 277 select XZ_DEC 278 tristate 279 280config DECOMPRESS_LZO 281 select LZO_DECOMPRESS 282 tristate 283 284config DECOMPRESS_LZ4 285 select LZ4_DECOMPRESS 286 tristate 287 288# 289# Generic allocator support is selected if needed 290# 291config GENERIC_ALLOCATOR 292 bool 293 294# 295# reed solomon support is select'ed if needed 296# 297config REED_SOLOMON 298 tristate 299 300config REED_SOLOMON_ENC8 301 bool 302 303config REED_SOLOMON_DEC8 304 bool 305 306config REED_SOLOMON_ENC16 307 bool 308 309config REED_SOLOMON_DEC16 310 bool 311 312# 313# BCH support is selected if needed 314# 315config BCH 316 tristate 317 318config BCH_CONST_PARAMS 319 bool 320 help 321 Drivers may select this option to force specific constant 322 values for parameters 'm' (Galois field order) and 't' 323 (error correction capability). Those specific values must 324 be set by declaring default values for symbols BCH_CONST_M 325 and BCH_CONST_T. 326 Doing so will enable extra compiler optimizations, 327 improving encoding and decoding performance up to 2x for 328 usual (m,t) values (typically such that m*t < 200). 329 When this option is selected, the BCH library supports 330 only a single (m,t) configuration. This is mainly useful 331 for NAND flash board drivers requiring known, fixed BCH 332 parameters. 333 334config BCH_CONST_M 335 int 336 range 5 15 337 help 338 Constant value for Galois field order 'm'. If 'k' is the 339 number of data bits to protect, 'm' should be chosen such 340 that (k + m*t) <= 2**m - 1. 341 Drivers should declare a default value for this symbol if 342 they select option BCH_CONST_PARAMS. 343 344config BCH_CONST_T 345 int 346 help 347 Constant value for error correction capability in bits 't'. 348 Drivers should declare a default value for this symbol if 349 they select option BCH_CONST_PARAMS. 350 351# 352# Textsearch support is select'ed if needed 353# 354config TEXTSEARCH 355 bool 356 357config TEXTSEARCH_KMP 358 tristate 359 360config TEXTSEARCH_BM 361 tristate 362 363config TEXTSEARCH_FSM 364 tristate 365 366config BTREE 367 bool 368 369config INTERVAL_TREE 370 bool 371 help 372 Simple, embeddable, interval-tree. Can find the start of an 373 overlapping range in log(n) time and then iterate over all 374 overlapping nodes. The algorithm is implemented as an 375 augmented rbtree. 376 377 See: 378 379 Documentation/rbtree.txt 380 381 for more information. 382 383config RADIX_TREE_MULTIORDER 384 bool 385 386config ASSOCIATIVE_ARRAY 387 bool 388 help 389 Generic associative array. Can be searched and iterated over whilst 390 it is being modified. It is also reasonably quick to search and 391 modify. The algorithms are non-recursive, and the trees are highly 392 capacious. 393 394 See: 395 396 Documentation/assoc_array.txt 397 398 for more information. 399 400config HAS_IOMEM 401 bool 402 depends on !NO_IOMEM 403 select GENERIC_IO 404 default y 405 406config HAS_IOPORT_MAP 407 bool 408 depends on HAS_IOMEM && !NO_IOPORT_MAP 409 default y 410 411config HAS_DMA 412 bool 413 depends on !NO_DMA 414 default y 415 416config DMA_NOOP_OPS 417 bool 418 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 419 default n 420 421config DMA_VIRT_OPS 422 bool 423 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 424 default n 425 426config CHECK_SIGNATURE 427 bool 428 429config CPUMASK_OFFSTACK 430 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 431 help 432 Use dynamic allocation for cpumask_var_t, instead of putting 433 them on the stack. This is a bit more expensive, but avoids 434 stack overflow. 435 436config CPU_RMAP 437 bool 438 depends on SMP 439 440config DQL 441 bool 442 443config GLOB 444 bool 445# This actually supports modular compilation, but the module overhead 446# is ridiculous for the amount of code involved. Until an out-of-tree 447# driver asks for it, we'll just link it directly it into the kernel 448# when required. Since we're ignoring out-of-tree users, there's also 449# no need bother prompting for a manual decision: 450# prompt "glob_match() function" 451 help 452 This option provides a glob_match function for performing 453 simple text pattern matching. It originated in the ATA code 454 to blacklist particular drive models, but other device drivers 455 may need similar functionality. 456 457 All drivers in the Linux kernel tree that require this function 458 should automatically select this option. Say N unless you 459 are compiling an out-of tree driver which tells you that it 460 depends on this. 461 462config GLOB_SELFTEST 463 tristate "glob self-test on init" 464 depends on GLOB 465 help 466 This option enables a simple self-test of the glob_match 467 function on startup. It is primarily useful for people 468 working on the code to ensure they haven't introduced any 469 regressions. 470 471 It only adds a little bit of code and slows kernel boot (or 472 module load) by a small amount, so you're welcome to play with 473 it, but you probably don't need it. 474 475# 476# Netlink attribute parsing support is select'ed if needed 477# 478config NLATTR 479 bool 480 481# 482# Generic 64-bit atomic support is selected if needed 483# 484config GENERIC_ATOMIC64 485 bool 486 487config LRU_CACHE 488 tristate 489 490config CLZ_TAB 491 bool 492 493config CORDIC 494 tristate "CORDIC algorithm" 495 help 496 This option provides an implementation of the CORDIC algorithm; 497 calculations are in fixed point. Module will be called cordic. 498 499config DDR 500 bool "JEDEC DDR data" 501 help 502 Data from JEDEC specs for DDR SDRAM memories, 503 particularly the AC timing parameters and addressing 504 information. This data is useful for drivers handling 505 DDR SDRAM controllers. 506 507config IRQ_POLL 508 bool "IRQ polling library" 509 help 510 Helper library to poll interrupt mitigation using polling. 511 512config MPILIB 513 tristate 514 select CLZ_TAB 515 help 516 Multiprecision maths library from GnuPG. 517 It is used to implement RSA digital signature verification, 518 which is used by IMA/EVM digital signature extension. 519 520config SIGNATURE 521 tristate 522 depends on KEYS 523 select CRYPTO 524 select CRYPTO_SHA1 525 select MPILIB 526 help 527 Digital signature verification. Currently only RSA is supported. 528 Implementation is done using GnuPG MPI library 529 530# 531# libfdt files, only selected if needed. 532# 533config LIBFDT 534 bool 535 536config OID_REGISTRY 537 tristate 538 help 539 Enable fast lookup object identifier registry. 540 541config UCS2_STRING 542 tristate 543 544source "lib/fonts/Kconfig" 545 546config SG_SPLIT 547 def_bool n 548 help 549 Provides a helper to split scatterlists into chunks, each chunk being 550 a scatterlist. This should be selected by a driver or an API which 551 whishes to split a scatterlist amongst multiple DMA channels. 552 553config SG_POOL 554 def_bool n 555 help 556 Provides a helper to allocate chained scatterlists. This should be 557 selected by a driver or an API which whishes to allocate chained 558 scatterlist. 559 560# 561# sg chaining option 562# 563 564config ARCH_HAS_SG_CHAIN 565 def_bool n 566 567config ARCH_HAS_PMEM_API 568 bool 569 570config ARCH_HAS_UACCESS_FLUSHCACHE 571 bool 572 573config STACKDEPOT 574 bool 575 select STACKTRACE 576 577config SBITMAP 578 bool 579 580config PARMAN 581 tristate "parman" if COMPILE_TEST 582 583config PRIME_NUMBERS 584 tristate 585 586config STRING_SELFTEST 587 bool "Test string functions" 588 589endmenu 590