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 STMP_DEVICE 50 bool 51 52config ARCH_USE_CMPXCHG_LOCKREF 53 bool 54 55config ARCH_HAS_FAST_MULTIPLIER 56 bool 57 58config CRC_CCITT 59 tristate "CRC-CCITT functions" 60 help 61 This option is provided for the case where no in-kernel-tree 62 modules require CRC-CCITT functions, but a module built outside 63 the kernel tree does. Such modules that use library CRC-CCITT 64 functions require M here. 65 66config CRC16 67 tristate "CRC16 functions" 68 help 69 This option is provided for the case where no in-kernel-tree 70 modules require CRC16 functions, but a module built outside 71 the kernel tree does. Such modules that use library CRC16 72 functions require M here. 73 74config CRC_T10DIF 75 tristate "CRC calculation for the T10 Data Integrity Field" 76 select CRYPTO 77 select CRYPTO_CRCT10DIF 78 help 79 This option is only needed if a module that's not in the 80 kernel tree needs to calculate CRC checks for use with the 81 SCSI data integrity subsystem. 82 83config CRC_ITU_T 84 tristate "CRC ITU-T V.41 functions" 85 help 86 This option is provided for the case where no in-kernel-tree 87 modules require CRC ITU-T V.41 functions, but a module built outside 88 the kernel tree does. Such modules that use library CRC ITU-T V.41 89 functions require M here. 90 91config CRC32 92 tristate "CRC32/CRC32c functions" 93 default y 94 select BITREVERSE 95 help 96 This option is provided for the case where no in-kernel-tree 97 modules require CRC32/CRC32c functions, but a module built outside 98 the kernel tree does. Such modules that use library CRC32/CRC32c 99 functions require M here. 100 101config CRC32_SELFTEST 102 tristate "CRC32 perform self test on init" 103 depends on CRC32 104 help 105 This option enables the CRC32 library functions to perform a 106 self test on initialization. The self test computes crc32_le 107 and crc32_be over byte strings with random alignment and length 108 and computes the total elapsed time and number of bytes processed. 109 110choice 111 prompt "CRC32 implementation" 112 depends on CRC32 113 default CRC32_SLICEBY8 114 help 115 This option allows a kernel builder to override the default choice 116 of CRC32 algorithm. Choose the default ("slice by 8") unless you 117 know that you need one of the others. 118 119config CRC32_SLICEBY8 120 bool "Slice by 8 bytes" 121 help 122 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 123 This is the fastest algorithm, but comes with a 8KiB lookup table. 124 Most modern processors have enough cache to hold this table without 125 thrashing the cache. 126 127 This is the default implementation choice. Choose this one unless 128 you have a good reason not to. 129 130config CRC32_SLICEBY4 131 bool "Slice by 4 bytes" 132 help 133 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 134 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 135 table. 136 137 Only choose this option if you know what you are doing. 138 139config CRC32_SARWATE 140 bool "Sarwate's Algorithm (one byte at a time)" 141 help 142 Calculate checksum a byte at a time using Sarwate's algorithm. This 143 is not particularly fast, but has a small 256 byte lookup table. 144 145 Only choose this option if you know what you are doing. 146 147config CRC32_BIT 148 bool "Classic Algorithm (one bit at a time)" 149 help 150 Calculate checksum one bit at a time. This is VERY slow, but has 151 no lookup table. This is provided as a debugging option. 152 153 Only choose this option if you are debugging crc32. 154 155endchoice 156 157config CRC4 158 tristate "CRC4 functions" 159 help 160 This option is provided for the case where no in-kernel-tree 161 modules require CRC4 functions, but a module built outside 162 the kernel tree does. Such modules that use library CRC4 163 functions require M here. 164 165config CRC7 166 tristate "CRC7 functions" 167 help 168 This option is provided for the case where no in-kernel-tree 169 modules require CRC7 functions, but a module built outside 170 the kernel tree does. Such modules that use library CRC7 171 functions require M here. 172 173config LIBCRC32C 174 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 175 select CRYPTO 176 select CRYPTO_CRC32C 177 help 178 This option is provided for the case where no in-kernel-tree 179 modules require CRC32c functions, but a module built outside the 180 kernel tree does. Such modules that use library CRC32c functions 181 require M here. See Castagnoli93. 182 Module will be libcrc32c. 183 184config CRC8 185 tristate "CRC8 function" 186 help 187 This option provides CRC8 function. Drivers may select this 188 when they need to do cyclic redundancy check according CRC8 189 algorithm. Module will be called crc8. 190 191config XXHASH 192 tristate 193 194config AUDIT_GENERIC 195 bool 196 depends on AUDIT && !AUDIT_ARCH 197 default y 198 199config AUDIT_ARCH_COMPAT_GENERIC 200 bool 201 default n 202 203config AUDIT_COMPAT_GENERIC 204 bool 205 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 206 default y 207 208config RANDOM32_SELFTEST 209 bool "PRNG perform self test on init" 210 default n 211 help 212 This option enables the 32 bit PRNG library functions to perform a 213 self test on initialization. 214 215# 216# compression support is select'ed if needed 217# 218config 842_COMPRESS 219 select CRC32 220 tristate 221 222config 842_DECOMPRESS 223 select CRC32 224 tristate 225 226config ZLIB_INFLATE 227 tristate 228 229config ZLIB_DEFLATE 230 tristate 231 select BITREVERSE 232 233config LZO_COMPRESS 234 tristate 235 236config LZO_DECOMPRESS 237 tristate 238 239config LZ4_COMPRESS 240 tristate 241 242config LZ4HC_COMPRESS 243 tristate 244 245config LZ4_DECOMPRESS 246 tristate 247 248config ZSTD_COMPRESS 249 select XXHASH 250 tristate 251 252config ZSTD_DECOMPRESS 253 select XXHASH 254 tristate 255 256source "lib/xz/Kconfig" 257 258# 259# These all provide a common interface (hence the apparent duplication with 260# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 261# 262config DECOMPRESS_GZIP 263 select ZLIB_INFLATE 264 tristate 265 266config DECOMPRESS_BZIP2 267 tristate 268 269config DECOMPRESS_LZMA 270 tristate 271 272config DECOMPRESS_XZ 273 select XZ_DEC 274 tristate 275 276config DECOMPRESS_LZO 277 select LZO_DECOMPRESS 278 tristate 279 280config DECOMPRESS_LZ4 281 select LZ4_DECOMPRESS 282 tristate 283 284# 285# Generic allocator support is selected if needed 286# 287config GENERIC_ALLOCATOR 288 bool 289 290# 291# reed solomon support is select'ed if needed 292# 293config REED_SOLOMON 294 tristate 295 296config REED_SOLOMON_ENC8 297 bool 298 299config REED_SOLOMON_DEC8 300 bool 301 302config REED_SOLOMON_ENC16 303 bool 304 305config REED_SOLOMON_DEC16 306 bool 307 308# 309# BCH support is selected if needed 310# 311config BCH 312 tristate 313 314config BCH_CONST_PARAMS 315 bool 316 help 317 Drivers may select this option to force specific constant 318 values for parameters 'm' (Galois field order) and 't' 319 (error correction capability). Those specific values must 320 be set by declaring default values for symbols BCH_CONST_M 321 and BCH_CONST_T. 322 Doing so will enable extra compiler optimizations, 323 improving encoding and decoding performance up to 2x for 324 usual (m,t) values (typically such that m*t < 200). 325 When this option is selected, the BCH library supports 326 only a single (m,t) configuration. This is mainly useful 327 for NAND flash board drivers requiring known, fixed BCH 328 parameters. 329 330config BCH_CONST_M 331 int 332 range 5 15 333 help 334 Constant value for Galois field order 'm'. If 'k' is the 335 number of data bits to protect, 'm' should be chosen such 336 that (k + m*t) <= 2**m - 1. 337 Drivers should declare a default value for this symbol if 338 they select option BCH_CONST_PARAMS. 339 340config BCH_CONST_T 341 int 342 help 343 Constant value for error correction capability in bits 't'. 344 Drivers should declare a default value for this symbol if 345 they select option BCH_CONST_PARAMS. 346 347# 348# Textsearch support is select'ed if needed 349# 350config TEXTSEARCH 351 bool 352 353config TEXTSEARCH_KMP 354 tristate 355 356config TEXTSEARCH_BM 357 tristate 358 359config TEXTSEARCH_FSM 360 tristate 361 362config BTREE 363 bool 364 365config INTERVAL_TREE 366 bool 367 help 368 Simple, embeddable, interval-tree. Can find the start of an 369 overlapping range in log(n) time and then iterate over all 370 overlapping nodes. The algorithm is implemented as an 371 augmented rbtree. 372 373 See: 374 375 Documentation/rbtree.txt 376 377 for more information. 378 379config RADIX_TREE_MULTIORDER 380 bool 381 382config ASSOCIATIVE_ARRAY 383 bool 384 help 385 Generic associative array. Can be searched and iterated over whilst 386 it is being modified. It is also reasonably quick to search and 387 modify. The algorithms are non-recursive, and the trees are highly 388 capacious. 389 390 See: 391 392 Documentation/assoc_array.txt 393 394 for more information. 395 396config HAS_IOMEM 397 bool 398 depends on !NO_IOMEM 399 select GENERIC_IO 400 default y 401 402config HAS_IOPORT_MAP 403 bool 404 depends on HAS_IOMEM && !NO_IOPORT_MAP 405 default y 406 407config HAS_DMA 408 bool 409 depends on !NO_DMA 410 default y 411 412config DMA_NOOP_OPS 413 bool 414 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 415 default n 416 417config DMA_VIRT_OPS 418 bool 419 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 420 default n 421 422config CHECK_SIGNATURE 423 bool 424 425config CPUMASK_OFFSTACK 426 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 427 help 428 Use dynamic allocation for cpumask_var_t, instead of putting 429 them on the stack. This is a bit more expensive, but avoids 430 stack overflow. 431 432config CPU_RMAP 433 bool 434 depends on SMP 435 436config DQL 437 bool 438 439config GLOB 440 bool 441# This actually supports modular compilation, but the module overhead 442# is ridiculous for the amount of code involved. Until an out-of-tree 443# driver asks for it, we'll just link it directly it into the kernel 444# when required. Since we're ignoring out-of-tree users, there's also 445# no need bother prompting for a manual decision: 446# prompt "glob_match() function" 447 help 448 This option provides a glob_match function for performing 449 simple text pattern matching. It originated in the ATA code 450 to blacklist particular drive models, but other device drivers 451 may need similar functionality. 452 453 All drivers in the Linux kernel tree that require this function 454 should automatically select this option. Say N unless you 455 are compiling an out-of tree driver which tells you that it 456 depends on this. 457 458config GLOB_SELFTEST 459 tristate "glob self-test on init" 460 depends on GLOB 461 help 462 This option enables a simple self-test of the glob_match 463 function on startup. It is primarily useful for people 464 working on the code to ensure they haven't introduced any 465 regressions. 466 467 It only adds a little bit of code and slows kernel boot (or 468 module load) by a small amount, so you're welcome to play with 469 it, but you probably don't need it. 470 471# 472# Netlink attribute parsing support is select'ed if needed 473# 474config NLATTR 475 bool 476 477# 478# Generic 64-bit atomic support is selected if needed 479# 480config GENERIC_ATOMIC64 481 bool 482 483config LRU_CACHE 484 tristate 485 486config CLZ_TAB 487 bool 488 489config CORDIC 490 tristate "CORDIC algorithm" 491 help 492 This option provides an implementation of the CORDIC algorithm; 493 calculations are in fixed point. Module will be called cordic. 494 495config DDR 496 bool "JEDEC DDR data" 497 help 498 Data from JEDEC specs for DDR SDRAM memories, 499 particularly the AC timing parameters and addressing 500 information. This data is useful for drivers handling 501 DDR SDRAM controllers. 502 503config IRQ_POLL 504 bool "IRQ polling library" 505 help 506 Helper library to poll interrupt mitigation using polling. 507 508config MPILIB 509 tristate 510 select CLZ_TAB 511 help 512 Multiprecision maths library from GnuPG. 513 It is used to implement RSA digital signature verification, 514 which is used by IMA/EVM digital signature extension. 515 516config SIGNATURE 517 tristate 518 depends on KEYS 519 select CRYPTO 520 select CRYPTO_SHA1 521 select MPILIB 522 help 523 Digital signature verification. Currently only RSA is supported. 524 Implementation is done using GnuPG MPI library 525 526# 527# libfdt files, only selected if needed. 528# 529config LIBFDT 530 bool 531 532config OID_REGISTRY 533 tristate 534 help 535 Enable fast lookup object identifier registry. 536 537config UCS2_STRING 538 tristate 539 540source "lib/fonts/Kconfig" 541 542config SG_SPLIT 543 def_bool n 544 help 545 Provides a helper to split scatterlists into chunks, each chunk being 546 a scatterlist. This should be selected by a driver or an API which 547 whishes to split a scatterlist amongst multiple DMA channels. 548 549config SG_POOL 550 def_bool n 551 help 552 Provides a helper to allocate chained scatterlists. This should be 553 selected by a driver or an API which whishes to allocate chained 554 scatterlist. 555 556# 557# sg chaining option 558# 559 560config ARCH_HAS_SG_CHAIN 561 def_bool n 562 563config ARCH_HAS_PMEM_API 564 bool 565 566config ARCH_HAS_UACCESS_FLUSHCACHE 567 bool 568 569config STACKDEPOT 570 bool 571 select STACKTRACE 572 573config SBITMAP 574 bool 575 576config PARMAN 577 tristate "parman" if COMPILE_TEST 578 579config PRIME_NUMBERS 580 tristate 581 582config STRING_SELFTEST 583 tristate "Test string functions" 584 585endmenu 586 587config GENERIC_ASHLDI3 588 bool 589 590config GENERIC_ASHRDI3 591 bool 592 593config GENERIC_LSHRDI3 594 bool 595 596config GENERIC_MULDI3 597 bool 598 599config GENERIC_CMPDI2 600 bool 601 602config GENERIC_UCMPDI2 603 bool 604