1 # 2 # Library configuration 3 # 4 5 config BINARY_PRINTF 6 def_bool n 7 8 menu "Library routines" 9 10 config RAID6_PQ 11 tristate 12 13 config BITREVERSE 14 tristate 15 16 config 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 24 config RATIONAL 25 bool 26 27 config GENERIC_STRNCPY_FROM_USER 28 bool 29 30 config GENERIC_STRNLEN_USER 31 bool 32 33 config GENERIC_NET_UTILS 34 bool 35 36 config GENERIC_FIND_FIRST_BIT 37 bool 38 39 config NO_GENERIC_PCI_IOPORT_MAP 40 bool 41 42 config GENERIC_PCI_IOMAP 43 bool 44 45 config GENERIC_IOMAP 46 bool 47 select GENERIC_PCI_IOMAP 48 49 config GENERIC_IO 50 bool 51 default n 52 53 config STMP_DEVICE 54 bool 55 56 config ARCH_USE_CMPXCHG_LOCKREF 57 bool 58 59 config ARCH_HAS_FAST_MULTIPLIER 60 bool 61 62 config 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 70 config 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 78 config 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 87 config 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 95 config 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. 104 105 config CRC32_SELFTEST 106 bool "CRC32 perform self test on init" 107 default n 108 depends on CRC32 109 help 110 This option enables the CRC32 library functions to perform a 111 self test on initialization. The self test computes crc32_le 112 and crc32_be over byte strings with random alignment and length 113 and computes the total elapsed time and number of bytes processed. 114 115 choice 116 prompt "CRC32 implementation" 117 depends on CRC32 118 default CRC32_SLICEBY8 119 help 120 This option allows a kernel builder to override the default choice 121 of CRC32 algorithm. Choose the default ("slice by 8") unless you 122 know that you need one of the others. 123 124 config CRC32_SLICEBY8 125 bool "Slice by 8 bytes" 126 help 127 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 128 This is the fastest algorithm, but comes with a 8KiB lookup table. 129 Most modern processors have enough cache to hold this table without 130 thrashing the cache. 131 132 This is the default implementation choice. Choose this one unless 133 you have a good reason not to. 134 135 config CRC32_SLICEBY4 136 bool "Slice by 4 bytes" 137 help 138 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 139 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 140 table. 141 142 Only choose this option if you know what you are doing. 143 144 config CRC32_SARWATE 145 bool "Sarwate's Algorithm (one byte at a time)" 146 help 147 Calculate checksum a byte at a time using Sarwate's algorithm. This 148 is not particularly fast, but has a small 256 byte lookup table. 149 150 Only choose this option if you know what you are doing. 151 152 config CRC32_BIT 153 bool "Classic Algorithm (one bit at a time)" 154 help 155 Calculate checksum one bit at a time. This is VERY slow, but has 156 no lookup table. This is provided as a debugging option. 157 158 Only choose this option if you are debugging crc32. 159 160 endchoice 161 162 config CRC7 163 tristate "CRC7 functions" 164 help 165 This option is provided for the case where no in-kernel-tree 166 modules require CRC7 functions, but a module built outside 167 the kernel tree does. Such modules that use library CRC7 168 functions require M here. 169 170 config LIBCRC32C 171 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 172 select CRYPTO 173 select CRYPTO_CRC32C 174 help 175 This option is provided for the case where no in-kernel-tree 176 modules require CRC32c functions, but a module built outside the 177 kernel tree does. Such modules that use library CRC32c functions 178 require M here. See Castagnoli93. 179 Module will be libcrc32c. 180 181 config CRC8 182 tristate "CRC8 function" 183 help 184 This option provides CRC8 function. Drivers may select this 185 when they need to do cyclic redundancy check according CRC8 186 algorithm. Module will be called crc8. 187 188 config AUDIT_GENERIC 189 bool 190 depends on AUDIT && !AUDIT_ARCH 191 default y 192 193 config AUDIT_ARCH_COMPAT_GENERIC 194 bool 195 default n 196 197 config AUDIT_COMPAT_GENERIC 198 bool 199 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 200 default y 201 202 config RANDOM32_SELFTEST 203 bool "PRNG perform self test on init" 204 default n 205 help 206 This option enables the 32 bit PRNG library functions to perform a 207 self test on initialization. 208 209 # 210 # compression support is select'ed if needed 211 # 212 config 842_COMPRESS 213 select CRC32 214 tristate 215 216 config 842_DECOMPRESS 217 select CRC32 218 tristate 219 220 config ZLIB_INFLATE 221 tristate 222 223 config ZLIB_DEFLATE 224 tristate 225 select BITREVERSE 226 227 config LZO_COMPRESS 228 tristate 229 230 config LZO_DECOMPRESS 231 tristate 232 233 config LZ4_COMPRESS 234 tristate 235 236 config LZ4HC_COMPRESS 237 tristate 238 239 config LZ4_DECOMPRESS 240 tristate 241 242 source "lib/xz/Kconfig" 243 244 # 245 # These all provide a common interface (hence the apparent duplication with 246 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 247 # 248 config DECOMPRESS_GZIP 249 select ZLIB_INFLATE 250 tristate 251 252 config DECOMPRESS_BZIP2 253 tristate 254 255 config DECOMPRESS_LZMA 256 tristate 257 258 config DECOMPRESS_XZ 259 select XZ_DEC 260 tristate 261 262 config DECOMPRESS_LZO 263 select LZO_DECOMPRESS 264 tristate 265 266 config DECOMPRESS_LZ4 267 select LZ4_DECOMPRESS 268 tristate 269 270 # 271 # Generic allocator support is selected if needed 272 # 273 config GENERIC_ALLOCATOR 274 bool 275 276 # 277 # reed solomon support is select'ed if needed 278 # 279 config REED_SOLOMON 280 tristate 281 282 config REED_SOLOMON_ENC8 283 bool 284 285 config REED_SOLOMON_DEC8 286 bool 287 288 config REED_SOLOMON_ENC16 289 bool 290 291 config REED_SOLOMON_DEC16 292 bool 293 294 # 295 # BCH support is selected if needed 296 # 297 config BCH 298 tristate 299 300 config BCH_CONST_PARAMS 301 bool 302 help 303 Drivers may select this option to force specific constant 304 values for parameters 'm' (Galois field order) and 't' 305 (error correction capability). Those specific values must 306 be set by declaring default values for symbols BCH_CONST_M 307 and BCH_CONST_T. 308 Doing so will enable extra compiler optimizations, 309 improving encoding and decoding performance up to 2x for 310 usual (m,t) values (typically such that m*t < 200). 311 When this option is selected, the BCH library supports 312 only a single (m,t) configuration. This is mainly useful 313 for NAND flash board drivers requiring known, fixed BCH 314 parameters. 315 316 config BCH_CONST_M 317 int 318 range 5 15 319 help 320 Constant value for Galois field order 'm'. If 'k' is the 321 number of data bits to protect, 'm' should be chosen such 322 that (k + m*t) <= 2**m - 1. 323 Drivers should declare a default value for this symbol if 324 they select option BCH_CONST_PARAMS. 325 326 config BCH_CONST_T 327 int 328 help 329 Constant value for error correction capability in bits 't'. 330 Drivers should declare a default value for this symbol if 331 they select option BCH_CONST_PARAMS. 332 333 # 334 # Textsearch support is select'ed if needed 335 # 336 config TEXTSEARCH 337 bool 338 339 config TEXTSEARCH_KMP 340 tristate 341 342 config TEXTSEARCH_BM 343 tristate 344 345 config TEXTSEARCH_FSM 346 tristate 347 348 config BTREE 349 bool 350 351 config INTERVAL_TREE 352 bool 353 help 354 Simple, embeddable, interval-tree. Can find the start of an 355 overlapping range in log(n) time and then iterate over all 356 overlapping nodes. The algorithm is implemented as an 357 augmented rbtree. 358 359 See: 360 361 Documentation/rbtree.txt 362 363 for more information. 364 365 config RADIX_TREE_MULTIORDER 366 bool 367 368 config ASSOCIATIVE_ARRAY 369 bool 370 help 371 Generic associative array. Can be searched and iterated over whilst 372 it is being modified. It is also reasonably quick to search and 373 modify. The algorithms are non-recursive, and the trees are highly 374 capacious. 375 376 See: 377 378 Documentation/assoc_array.txt 379 380 for more information. 381 382 config HAS_IOMEM 383 bool 384 depends on !NO_IOMEM 385 select GENERIC_IO 386 default y 387 388 config HAS_IOPORT_MAP 389 bool 390 depends on HAS_IOMEM && !NO_IOPORT_MAP 391 default y 392 393 config HAS_DMA 394 bool 395 depends on !NO_DMA 396 default y 397 398 config CHECK_SIGNATURE 399 bool 400 401 config CPUMASK_OFFSTACK 402 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 403 help 404 Use dynamic allocation for cpumask_var_t, instead of putting 405 them on the stack. This is a bit more expensive, but avoids 406 stack overflow. 407 408 config CPU_RMAP 409 bool 410 depends on SMP 411 412 config DQL 413 bool 414 415 config GLOB 416 bool 417 # This actually supports modular compilation, but the module overhead 418 # is ridiculous for the amount of code involved. Until an out-of-tree 419 # driver asks for it, we'll just link it directly it into the kernel 420 # when required. Since we're ignoring out-of-tree users, there's also 421 # no need bother prompting for a manual decision: 422 # prompt "glob_match() function" 423 help 424 This option provides a glob_match function for performing 425 simple text pattern matching. It originated in the ATA code 426 to blacklist particular drive models, but other device drivers 427 may need similar functionality. 428 429 All drivers in the Linux kernel tree that require this function 430 should automatically select this option. Say N unless you 431 are compiling an out-of tree driver which tells you that it 432 depends on this. 433 434 config GLOB_SELFTEST 435 bool "glob self-test on init" 436 default n 437 depends on GLOB 438 help 439 This option enables a simple self-test of the glob_match 440 function on startup. It is primarily useful for people 441 working on the code to ensure they haven't introduced any 442 regressions. 443 444 It only adds a little bit of code and slows kernel boot (or 445 module load) by a small amount, so you're welcome to play with 446 it, but you probably don't need it. 447 448 # 449 # Netlink attribute parsing support is select'ed if needed 450 # 451 config NLATTR 452 bool 453 454 # 455 # Generic 64-bit atomic support is selected if needed 456 # 457 config GENERIC_ATOMIC64 458 bool 459 460 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 461 def_bool y if GENERIC_ATOMIC64 462 463 config LRU_CACHE 464 tristate 465 466 config CLZ_TAB 467 bool 468 469 config CORDIC 470 tristate "CORDIC algorithm" 471 help 472 This option provides an implementation of the CORDIC algorithm; 473 calculations are in fixed point. Module will be called cordic. 474 475 config DDR 476 bool "JEDEC DDR data" 477 help 478 Data from JEDEC specs for DDR SDRAM memories, 479 particularly the AC timing parameters and addressing 480 information. This data is useful for drivers handling 481 DDR SDRAM controllers. 482 483 config IRQ_POLL 484 bool "IRQ polling library" 485 help 486 Helper library to poll interrupt mitigation using polling. 487 488 config MPILIB 489 tristate 490 select CLZ_TAB 491 help 492 Multiprecision maths library from GnuPG. 493 It is used to implement RSA digital signature verification, 494 which is used by IMA/EVM digital signature extension. 495 496 config SIGNATURE 497 tristate 498 depends on KEYS 499 select CRYPTO 500 select CRYPTO_SHA1 501 select MPILIB 502 help 503 Digital signature verification. Currently only RSA is supported. 504 Implementation is done using GnuPG MPI library 505 506 # 507 # libfdt files, only selected if needed. 508 # 509 config LIBFDT 510 bool 511 512 config OID_REGISTRY 513 tristate 514 help 515 Enable fast lookup object identifier registry. 516 517 config UCS2_STRING 518 tristate 519 520 source "lib/fonts/Kconfig" 521 522 config SG_SPLIT 523 def_bool n 524 help 525 Provides a helper to split scatterlists into chunks, each chunk being 526 a scatterlist. This should be selected by a driver or an API which 527 whishes to split a scatterlist amongst multiple DMA channels. 528 529 config SG_POOL 530 def_bool n 531 help 532 Provides a helper to allocate chained scatterlists. This should be 533 selected by a driver or an API which whishes to allocate chained 534 scatterlist. 535 536 # 537 # sg chaining option 538 # 539 540 config ARCH_HAS_SG_CHAIN 541 def_bool n 542 543 config ARCH_HAS_PMEM_API 544 bool 545 546 config ARCH_HAS_MMIO_FLUSH 547 bool 548 549 config STACKDEPOT 550 bool 551 select STACKTRACE 552 553 endmenu 554