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 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 115choice 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 124config 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 135config 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 144config 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 152config 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 160endchoice 161 162config 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 170config 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 181config 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 188config AUDIT_GENERIC 189 bool 190 depends on AUDIT && !AUDIT_ARCH 191 default y 192 193config AUDIT_ARCH_COMPAT_GENERIC 194 bool 195 default n 196 197config AUDIT_COMPAT_GENERIC 198 bool 199 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 200 default y 201 202config 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# 212config 842_COMPRESS 213 tristate 214 215config 842_DECOMPRESS 216 tristate 217 218config ZLIB_INFLATE 219 tristate 220 221config ZLIB_DEFLATE 222 tristate 223 select BITREVERSE 224 225config LZO_COMPRESS 226 tristate 227 228config LZO_DECOMPRESS 229 tristate 230 231config LZ4_COMPRESS 232 tristate 233 234config LZ4HC_COMPRESS 235 tristate 236 237config LZ4_DECOMPRESS 238 tristate 239 240source "lib/xz/Kconfig" 241 242# 243# These all provide a common interface (hence the apparent duplication with 244# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 245# 246config DECOMPRESS_GZIP 247 select ZLIB_INFLATE 248 tristate 249 250config DECOMPRESS_BZIP2 251 tristate 252 253config DECOMPRESS_LZMA 254 tristate 255 256config DECOMPRESS_XZ 257 select XZ_DEC 258 tristate 259 260config DECOMPRESS_LZO 261 select LZO_DECOMPRESS 262 tristate 263 264config DECOMPRESS_LZ4 265 select LZ4_DECOMPRESS 266 tristate 267 268# 269# Generic allocator support is selected if needed 270# 271config GENERIC_ALLOCATOR 272 bool 273 274# 275# reed solomon support is select'ed if needed 276# 277config REED_SOLOMON 278 tristate 279 280config REED_SOLOMON_ENC8 281 bool 282 283config REED_SOLOMON_DEC8 284 bool 285 286config REED_SOLOMON_ENC16 287 bool 288 289config REED_SOLOMON_DEC16 290 bool 291 292# 293# BCH support is selected if needed 294# 295config BCH 296 tristate 297 298config BCH_CONST_PARAMS 299 bool 300 help 301 Drivers may select this option to force specific constant 302 values for parameters 'm' (Galois field order) and 't' 303 (error correction capability). Those specific values must 304 be set by declaring default values for symbols BCH_CONST_M 305 and BCH_CONST_T. 306 Doing so will enable extra compiler optimizations, 307 improving encoding and decoding performance up to 2x for 308 usual (m,t) values (typically such that m*t < 200). 309 When this option is selected, the BCH library supports 310 only a single (m,t) configuration. This is mainly useful 311 for NAND flash board drivers requiring known, fixed BCH 312 parameters. 313 314config BCH_CONST_M 315 int 316 range 5 15 317 help 318 Constant value for Galois field order 'm'. If 'k' is the 319 number of data bits to protect, 'm' should be chosen such 320 that (k + m*t) <= 2**m - 1. 321 Drivers should declare a default value for this symbol if 322 they select option BCH_CONST_PARAMS. 323 324config BCH_CONST_T 325 int 326 help 327 Constant value for error correction capability in bits 't'. 328 Drivers should declare a default value for this symbol if 329 they select option BCH_CONST_PARAMS. 330 331# 332# Textsearch support is select'ed if needed 333# 334config TEXTSEARCH 335 bool 336 337config TEXTSEARCH_KMP 338 tristate 339 340config TEXTSEARCH_BM 341 tristate 342 343config TEXTSEARCH_FSM 344 tristate 345 346config BTREE 347 bool 348 349config INTERVAL_TREE 350 bool 351 help 352 Simple, embeddable, interval-tree. Can find the start of an 353 overlapping range in log(n) time and then iterate over all 354 overlapping nodes. The algorithm is implemented as an 355 augmented rbtree. 356 357 See: 358 359 Documentation/rbtree.txt 360 361 for more information. 362 363config ASSOCIATIVE_ARRAY 364 bool 365 help 366 Generic associative array. Can be searched and iterated over whilst 367 it is being modified. It is also reasonably quick to search and 368 modify. The algorithms are non-recursive, and the trees are highly 369 capacious. 370 371 See: 372 373 Documentation/assoc_array.txt 374 375 for more information. 376 377config HAS_IOMEM 378 bool 379 depends on !NO_IOMEM 380 select GENERIC_IO 381 default y 382 383config HAS_IOPORT_MAP 384 bool 385 depends on HAS_IOMEM && !NO_IOPORT_MAP 386 default y 387 388config HAS_DMA 389 bool 390 depends on !NO_DMA 391 default y 392 393config CHECK_SIGNATURE 394 bool 395 396config CPUMASK_OFFSTACK 397 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 398 help 399 Use dynamic allocation for cpumask_var_t, instead of putting 400 them on the stack. This is a bit more expensive, but avoids 401 stack overflow. 402 403config CPU_RMAP 404 bool 405 depends on SMP 406 407config DQL 408 bool 409 410config GLOB 411 bool 412# This actually supports modular compilation, but the module overhead 413# is ridiculous for the amount of code involved. Until an out-of-tree 414# driver asks for it, we'll just link it directly it into the kernel 415# when required. Since we're ignoring out-of-tree users, there's also 416# no need bother prompting for a manual decision: 417# prompt "glob_match() function" 418 help 419 This option provides a glob_match function for performing 420 simple text pattern matching. It originated in the ATA code 421 to blacklist particular drive models, but other device drivers 422 may need similar functionality. 423 424 All drivers in the Linux kernel tree that require this function 425 should automatically select this option. Say N unless you 426 are compiling an out-of tree driver which tells you that it 427 depends on this. 428 429config GLOB_SELFTEST 430 bool "glob self-test on init" 431 default n 432 depends on GLOB 433 help 434 This option enables a simple self-test of the glob_match 435 function on startup. It is primarily useful for people 436 working on the code to ensure they haven't introduced any 437 regressions. 438 439 It only adds a little bit of code and slows kernel boot (or 440 module load) by a small amount, so you're welcome to play with 441 it, but you probably don't need it. 442 443# 444# Netlink attribute parsing support is select'ed if needed 445# 446config NLATTR 447 bool 448 449# 450# Generic 64-bit atomic support is selected if needed 451# 452config GENERIC_ATOMIC64 453 bool 454 455config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 456 def_bool y if GENERIC_ATOMIC64 457 458config LRU_CACHE 459 tristate 460 461config CLZ_TAB 462 bool 463 464config CORDIC 465 tristate "CORDIC algorithm" 466 help 467 This option provides an implementation of the CORDIC algorithm; 468 calculations are in fixed point. Module will be called cordic. 469 470config DDR 471 bool "JEDEC DDR data" 472 help 473 Data from JEDEC specs for DDR SDRAM memories, 474 particularly the AC timing parameters and addressing 475 information. This data is useful for drivers handling 476 DDR SDRAM controllers. 477 478config MPILIB 479 tristate 480 select CLZ_TAB 481 help 482 Multiprecision maths library from GnuPG. 483 It is used to implement RSA digital signature verification, 484 which is used by IMA/EVM digital signature extension. 485 486config SIGNATURE 487 tristate 488 depends on KEYS 489 select CRYPTO 490 select CRYPTO_SHA1 491 select MPILIB 492 help 493 Digital signature verification. Currently only RSA is supported. 494 Implementation is done using GnuPG MPI library 495 496# 497# libfdt files, only selected if needed. 498# 499config LIBFDT 500 bool 501 502config OID_REGISTRY 503 tristate 504 help 505 Enable fast lookup object identifier registry. 506 507config UCS2_STRING 508 tristate 509 510source "lib/fonts/Kconfig" 511 512config SG_SPLIT 513 def_bool n 514 help 515 Provides a heler to split scatterlists into chunks, each chunk being a 516 scatterlist. This should be selected by a driver or an API which 517 whishes to split a scatterlist amongst multiple DMA channel. 518 519# 520# sg chaining option 521# 522 523config ARCH_HAS_SG_CHAIN 524 def_bool n 525 526config ARCH_HAS_PMEM_API 527 bool 528 529config ARCH_HAS_MMIO_FLUSH 530 bool 531 532endmenu 533