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 CRC7 162 tristate "CRC7 functions" 163 help 164 This option is provided for the case where no in-kernel-tree 165 modules require CRC7 functions, but a module built outside 166 the kernel tree does. Such modules that use library CRC7 167 functions require M here. 168 169config LIBCRC32C 170 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 171 select CRYPTO 172 select CRYPTO_CRC32C 173 help 174 This option is provided for the case where no in-kernel-tree 175 modules require CRC32c functions, but a module built outside the 176 kernel tree does. Such modules that use library CRC32c functions 177 require M here. See Castagnoli93. 178 Module will be libcrc32c. 179 180config CRC8 181 tristate "CRC8 function" 182 help 183 This option provides CRC8 function. Drivers may select this 184 when they need to do cyclic redundancy check according CRC8 185 algorithm. Module will be called crc8. 186 187config AUDIT_GENERIC 188 bool 189 depends on AUDIT && !AUDIT_ARCH 190 default y 191 192config AUDIT_ARCH_COMPAT_GENERIC 193 bool 194 default n 195 196config AUDIT_COMPAT_GENERIC 197 bool 198 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 199 default y 200 201config RANDOM32_SELFTEST 202 bool "PRNG perform self test on init" 203 default n 204 help 205 This option enables the 32 bit PRNG library functions to perform a 206 self test on initialization. 207 208# 209# compression support is select'ed if needed 210# 211config 842_COMPRESS 212 select CRC32 213 tristate 214 215config 842_DECOMPRESS 216 select CRC32 217 tristate 218 219config ZLIB_INFLATE 220 tristate 221 222config ZLIB_DEFLATE 223 tristate 224 select BITREVERSE 225 226config LZO_COMPRESS 227 tristate 228 229config LZO_DECOMPRESS 230 tristate 231 232config LZ4_COMPRESS 233 tristate 234 235config LZ4HC_COMPRESS 236 tristate 237 238config LZ4_DECOMPRESS 239 tristate 240 241source "lib/xz/Kconfig" 242 243# 244# These all provide a common interface (hence the apparent duplication with 245# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 246# 247config DECOMPRESS_GZIP 248 select ZLIB_INFLATE 249 tristate 250 251config DECOMPRESS_BZIP2 252 tristate 253 254config DECOMPRESS_LZMA 255 tristate 256 257config DECOMPRESS_XZ 258 select XZ_DEC 259 tristate 260 261config DECOMPRESS_LZO 262 select LZO_DECOMPRESS 263 tristate 264 265config DECOMPRESS_LZ4 266 select LZ4_DECOMPRESS 267 tristate 268 269# 270# Generic allocator support is selected if needed 271# 272config GENERIC_ALLOCATOR 273 bool 274 275# 276# reed solomon support is select'ed if needed 277# 278config REED_SOLOMON 279 tristate 280 281config REED_SOLOMON_ENC8 282 bool 283 284config REED_SOLOMON_DEC8 285 bool 286 287config REED_SOLOMON_ENC16 288 bool 289 290config REED_SOLOMON_DEC16 291 bool 292 293# 294# BCH support is selected if needed 295# 296config BCH 297 tristate 298 299config BCH_CONST_PARAMS 300 bool 301 help 302 Drivers may select this option to force specific constant 303 values for parameters 'm' (Galois field order) and 't' 304 (error correction capability). Those specific values must 305 be set by declaring default values for symbols BCH_CONST_M 306 and BCH_CONST_T. 307 Doing so will enable extra compiler optimizations, 308 improving encoding and decoding performance up to 2x for 309 usual (m,t) values (typically such that m*t < 200). 310 When this option is selected, the BCH library supports 311 only a single (m,t) configuration. This is mainly useful 312 for NAND flash board drivers requiring known, fixed BCH 313 parameters. 314 315config BCH_CONST_M 316 int 317 range 5 15 318 help 319 Constant value for Galois field order 'm'. If 'k' is the 320 number of data bits to protect, 'm' should be chosen such 321 that (k + m*t) <= 2**m - 1. 322 Drivers should declare a default value for this symbol if 323 they select option BCH_CONST_PARAMS. 324 325config BCH_CONST_T 326 int 327 help 328 Constant value for error correction capability in bits 't'. 329 Drivers should declare a default value for this symbol if 330 they select option BCH_CONST_PARAMS. 331 332# 333# Textsearch support is select'ed if needed 334# 335config TEXTSEARCH 336 bool 337 338config TEXTSEARCH_KMP 339 tristate 340 341config TEXTSEARCH_BM 342 tristate 343 344config TEXTSEARCH_FSM 345 tristate 346 347config BTREE 348 bool 349 350config INTERVAL_TREE 351 bool 352 help 353 Simple, embeddable, interval-tree. Can find the start of an 354 overlapping range in log(n) time and then iterate over all 355 overlapping nodes. The algorithm is implemented as an 356 augmented rbtree. 357 358 See: 359 360 Documentation/rbtree.txt 361 362 for more information. 363 364config RADIX_TREE_MULTIORDER 365 bool 366 367config ASSOCIATIVE_ARRAY 368 bool 369 help 370 Generic associative array. Can be searched and iterated over whilst 371 it is being modified. It is also reasonably quick to search and 372 modify. The algorithms are non-recursive, and the trees are highly 373 capacious. 374 375 See: 376 377 Documentation/assoc_array.txt 378 379 for more information. 380 381config HAS_IOMEM 382 bool 383 depends on !NO_IOMEM 384 select GENERIC_IO 385 default y 386 387config HAS_IOPORT_MAP 388 bool 389 depends on HAS_IOMEM && !NO_IOPORT_MAP 390 default y 391 392config HAS_DMA 393 bool 394 depends on !NO_DMA 395 default y 396 397config DMA_NOOP_OPS 398 bool 399 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 400 default n 401 402config DMA_VIRT_OPS 403 bool 404 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 405 default n 406 407config CHECK_SIGNATURE 408 bool 409 410config CPUMASK_OFFSTACK 411 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 412 help 413 Use dynamic allocation for cpumask_var_t, instead of putting 414 them on the stack. This is a bit more expensive, but avoids 415 stack overflow. 416 417config CPU_RMAP 418 bool 419 depends on SMP 420 421config DQL 422 bool 423 424config GLOB 425 bool 426# This actually supports modular compilation, but the module overhead 427# is ridiculous for the amount of code involved. Until an out-of-tree 428# driver asks for it, we'll just link it directly it into the kernel 429# when required. Since we're ignoring out-of-tree users, there's also 430# no need bother prompting for a manual decision: 431# prompt "glob_match() function" 432 help 433 This option provides a glob_match function for performing 434 simple text pattern matching. It originated in the ATA code 435 to blacklist particular drive models, but other device drivers 436 may need similar functionality. 437 438 All drivers in the Linux kernel tree that require this function 439 should automatically select this option. Say N unless you 440 are compiling an out-of tree driver which tells you that it 441 depends on this. 442 443config GLOB_SELFTEST 444 tristate "glob self-test on init" 445 depends on GLOB 446 help 447 This option enables a simple self-test of the glob_match 448 function on startup. It is primarily useful for people 449 working on the code to ensure they haven't introduced any 450 regressions. 451 452 It only adds a little bit of code and slows kernel boot (or 453 module load) by a small amount, so you're welcome to play with 454 it, but you probably don't need it. 455 456# 457# Netlink attribute parsing support is select'ed if needed 458# 459config NLATTR 460 bool 461 462# 463# Generic 64-bit atomic support is selected if needed 464# 465config GENERIC_ATOMIC64 466 bool 467 468config LRU_CACHE 469 tristate 470 471config CLZ_TAB 472 bool 473 474config CORDIC 475 tristate "CORDIC algorithm" 476 help 477 This option provides an implementation of the CORDIC algorithm; 478 calculations are in fixed point. Module will be called cordic. 479 480config DDR 481 bool "JEDEC DDR data" 482 help 483 Data from JEDEC specs for DDR SDRAM memories, 484 particularly the AC timing parameters and addressing 485 information. This data is useful for drivers handling 486 DDR SDRAM controllers. 487 488config IRQ_POLL 489 bool "IRQ polling library" 490 help 491 Helper library to poll interrupt mitigation using polling. 492 493config MPILIB 494 tristate 495 select CLZ_TAB 496 help 497 Multiprecision maths library from GnuPG. 498 It is used to implement RSA digital signature verification, 499 which is used by IMA/EVM digital signature extension. 500 501config SIGNATURE 502 tristate 503 depends on KEYS 504 select CRYPTO 505 select CRYPTO_SHA1 506 select MPILIB 507 help 508 Digital signature verification. Currently only RSA is supported. 509 Implementation is done using GnuPG MPI library 510 511# 512# libfdt files, only selected if needed. 513# 514config LIBFDT 515 bool 516 517config OID_REGISTRY 518 tristate 519 help 520 Enable fast lookup object identifier registry. 521 522config UCS2_STRING 523 tristate 524 525source "lib/fonts/Kconfig" 526 527config SG_SPLIT 528 def_bool n 529 help 530 Provides a helper to split scatterlists into chunks, each chunk being 531 a scatterlist. This should be selected by a driver or an API which 532 whishes to split a scatterlist amongst multiple DMA channels. 533 534config SG_POOL 535 def_bool n 536 help 537 Provides a helper to allocate chained scatterlists. This should be 538 selected by a driver or an API which whishes to allocate chained 539 scatterlist. 540 541# 542# sg chaining option 543# 544 545config ARCH_HAS_SG_CHAIN 546 def_bool n 547 548config ARCH_HAS_PMEM_API 549 bool 550 551config ARCH_HAS_MMIO_FLUSH 552 bool 553 554config STACKDEPOT 555 bool 556 select STACKTRACE 557 558config SBITMAP 559 bool 560 561config PARMAN 562 tristate "parman" if COMPILE_TEST 563 564config PRIME_NUMBERS 565 tristate 566 567endmenu 568