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 AUDIT_GENERIC 196 bool 197 depends on AUDIT && !AUDIT_ARCH 198 default y 199 200config AUDIT_ARCH_COMPAT_GENERIC 201 bool 202 default n 203 204config AUDIT_COMPAT_GENERIC 205 bool 206 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 207 default y 208 209config RANDOM32_SELFTEST 210 bool "PRNG perform self test on init" 211 default n 212 help 213 This option enables the 32 bit PRNG library functions to perform a 214 self test on initialization. 215 216# 217# compression support is select'ed if needed 218# 219config 842_COMPRESS 220 select CRC32 221 tristate 222 223config 842_DECOMPRESS 224 select CRC32 225 tristate 226 227config ZLIB_INFLATE 228 tristate 229 230config ZLIB_DEFLATE 231 tristate 232 select BITREVERSE 233 234config LZO_COMPRESS 235 tristate 236 237config LZO_DECOMPRESS 238 tristate 239 240config LZ4_COMPRESS 241 tristate 242 243config LZ4HC_COMPRESS 244 tristate 245 246config LZ4_DECOMPRESS 247 tristate 248 249source "lib/xz/Kconfig" 250 251# 252# These all provide a common interface (hence the apparent duplication with 253# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 254# 255config DECOMPRESS_GZIP 256 select ZLIB_INFLATE 257 tristate 258 259config DECOMPRESS_BZIP2 260 tristate 261 262config DECOMPRESS_LZMA 263 tristate 264 265config DECOMPRESS_XZ 266 select XZ_DEC 267 tristate 268 269config DECOMPRESS_LZO 270 select LZO_DECOMPRESS 271 tristate 272 273config DECOMPRESS_LZ4 274 select LZ4_DECOMPRESS 275 tristate 276 277# 278# Generic allocator support is selected if needed 279# 280config GENERIC_ALLOCATOR 281 bool 282 283# 284# reed solomon support is select'ed if needed 285# 286config REED_SOLOMON 287 tristate 288 289config REED_SOLOMON_ENC8 290 bool 291 292config REED_SOLOMON_DEC8 293 bool 294 295config REED_SOLOMON_ENC16 296 bool 297 298config REED_SOLOMON_DEC16 299 bool 300 301# 302# BCH support is selected if needed 303# 304config BCH 305 tristate 306 307config BCH_CONST_PARAMS 308 bool 309 help 310 Drivers may select this option to force specific constant 311 values for parameters 'm' (Galois field order) and 't' 312 (error correction capability). Those specific values must 313 be set by declaring default values for symbols BCH_CONST_M 314 and BCH_CONST_T. 315 Doing so will enable extra compiler optimizations, 316 improving encoding and decoding performance up to 2x for 317 usual (m,t) values (typically such that m*t < 200). 318 When this option is selected, the BCH library supports 319 only a single (m,t) configuration. This is mainly useful 320 for NAND flash board drivers requiring known, fixed BCH 321 parameters. 322 323config BCH_CONST_M 324 int 325 range 5 15 326 help 327 Constant value for Galois field order 'm'. If 'k' is the 328 number of data bits to protect, 'm' should be chosen such 329 that (k + m*t) <= 2**m - 1. 330 Drivers should declare a default value for this symbol if 331 they select option BCH_CONST_PARAMS. 332 333config BCH_CONST_T 334 int 335 help 336 Constant value for error correction capability in bits 't'. 337 Drivers should declare a default value for this symbol if 338 they select option BCH_CONST_PARAMS. 339 340# 341# Textsearch support is select'ed if needed 342# 343config TEXTSEARCH 344 bool 345 346config TEXTSEARCH_KMP 347 tristate 348 349config TEXTSEARCH_BM 350 tristate 351 352config TEXTSEARCH_FSM 353 tristate 354 355config BTREE 356 bool 357 358config INTERVAL_TREE 359 bool 360 help 361 Simple, embeddable, interval-tree. Can find the start of an 362 overlapping range in log(n) time and then iterate over all 363 overlapping nodes. The algorithm is implemented as an 364 augmented rbtree. 365 366 See: 367 368 Documentation/rbtree.txt 369 370 for more information. 371 372config RADIX_TREE_MULTIORDER 373 bool 374 375config ASSOCIATIVE_ARRAY 376 bool 377 help 378 Generic associative array. Can be searched and iterated over whilst 379 it is being modified. It is also reasonably quick to search and 380 modify. The algorithms are non-recursive, and the trees are highly 381 capacious. 382 383 See: 384 385 Documentation/assoc_array.txt 386 387 for more information. 388 389config HAS_IOMEM 390 bool 391 depends on !NO_IOMEM 392 select GENERIC_IO 393 default y 394 395config HAS_IOPORT_MAP 396 bool 397 depends on HAS_IOMEM && !NO_IOPORT_MAP 398 default y 399 400config HAS_DMA 401 bool 402 depends on !NO_DMA 403 default y 404 405config DMA_NOOP_OPS 406 bool 407 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 408 default n 409 410config DMA_VIRT_OPS 411 bool 412 depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT) 413 default n 414 415config CHECK_SIGNATURE 416 bool 417 418config CPUMASK_OFFSTACK 419 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 420 help 421 Use dynamic allocation for cpumask_var_t, instead of putting 422 them on the stack. This is a bit more expensive, but avoids 423 stack overflow. 424 425config CPU_RMAP 426 bool 427 depends on SMP 428 429config DQL 430 bool 431 432config GLOB 433 bool 434# This actually supports modular compilation, but the module overhead 435# is ridiculous for the amount of code involved. Until an out-of-tree 436# driver asks for it, we'll just link it directly it into the kernel 437# when required. Since we're ignoring out-of-tree users, there's also 438# no need bother prompting for a manual decision: 439# prompt "glob_match() function" 440 help 441 This option provides a glob_match function for performing 442 simple text pattern matching. It originated in the ATA code 443 to blacklist particular drive models, but other device drivers 444 may need similar functionality. 445 446 All drivers in the Linux kernel tree that require this function 447 should automatically select this option. Say N unless you 448 are compiling an out-of tree driver which tells you that it 449 depends on this. 450 451config GLOB_SELFTEST 452 tristate "glob self-test on init" 453 depends on GLOB 454 help 455 This option enables a simple self-test of the glob_match 456 function on startup. It is primarily useful for people 457 working on the code to ensure they haven't introduced any 458 regressions. 459 460 It only adds a little bit of code and slows kernel boot (or 461 module load) by a small amount, so you're welcome to play with 462 it, but you probably don't need it. 463 464# 465# Netlink attribute parsing support is select'ed if needed 466# 467config NLATTR 468 bool 469 470# 471# Generic 64-bit atomic support is selected if needed 472# 473config GENERIC_ATOMIC64 474 bool 475 476config LRU_CACHE 477 tristate 478 479config CLZ_TAB 480 bool 481 482config CORDIC 483 tristate "CORDIC algorithm" 484 help 485 This option provides an implementation of the CORDIC algorithm; 486 calculations are in fixed point. Module will be called cordic. 487 488config DDR 489 bool "JEDEC DDR data" 490 help 491 Data from JEDEC specs for DDR SDRAM memories, 492 particularly the AC timing parameters and addressing 493 information. This data is useful for drivers handling 494 DDR SDRAM controllers. 495 496config IRQ_POLL 497 bool "IRQ polling library" 498 help 499 Helper library to poll interrupt mitigation using polling. 500 501config MPILIB 502 tristate 503 select CLZ_TAB 504 help 505 Multiprecision maths library from GnuPG. 506 It is used to implement RSA digital signature verification, 507 which is used by IMA/EVM digital signature extension. 508 509config SIGNATURE 510 tristate 511 depends on KEYS 512 select CRYPTO 513 select CRYPTO_SHA1 514 select MPILIB 515 help 516 Digital signature verification. Currently only RSA is supported. 517 Implementation is done using GnuPG MPI library 518 519# 520# libfdt files, only selected if needed. 521# 522config LIBFDT 523 bool 524 525config OID_REGISTRY 526 tristate 527 help 528 Enable fast lookup object identifier registry. 529 530config UCS2_STRING 531 tristate 532 533source "lib/fonts/Kconfig" 534 535config SG_SPLIT 536 def_bool n 537 help 538 Provides a helper to split scatterlists into chunks, each chunk being 539 a scatterlist. This should be selected by a driver or an API which 540 whishes to split a scatterlist amongst multiple DMA channels. 541 542config SG_POOL 543 def_bool n 544 help 545 Provides a helper to allocate chained scatterlists. This should be 546 selected by a driver or an API which whishes to allocate chained 547 scatterlist. 548 549# 550# sg chaining option 551# 552 553config ARCH_HAS_SG_CHAIN 554 def_bool n 555 556config ARCH_HAS_PMEM_API 557 bool 558 559config ARCH_HAS_UACCESS_FLUSHCACHE 560 bool 561 562config ARCH_HAS_MMIO_FLUSH 563 bool 564 565config STACKDEPOT 566 bool 567 select STACKTRACE 568 569config SBITMAP 570 bool 571 572config PARMAN 573 tristate "parman" if COMPILE_TEST 574 575config PRIME_NUMBERS 576 tristate 577 578endmenu 579