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 boolean 18 default n 19 depends on BITREVERSE 20 help 21 This option provides an config for the architecture which have instruction 22 can do bitreverse operation, we use the hardware instruction if the architecture 23 have this capability. 24 25config RATIONAL 26 boolean 27 28config GENERIC_STRNCPY_FROM_USER 29 bool 30 31config GENERIC_STRNLEN_USER 32 bool 33 34config GENERIC_NET_UTILS 35 bool 36 37config GENERIC_FIND_FIRST_BIT 38 bool 39 40config NO_GENERIC_PCI_IOPORT_MAP 41 bool 42 43config GENERIC_PCI_IOMAP 44 bool 45 46config GENERIC_IOMAP 47 bool 48 select GENERIC_PCI_IOMAP 49 50config GENERIC_IO 51 boolean 52 default n 53 54config STMP_DEVICE 55 bool 56 57config PERCPU_RWSEM 58 boolean 59 60config ARCH_USE_CMPXCHG_LOCKREF 61 bool 62 63config ARCH_HAS_FAST_MULTIPLIER 64 bool 65 66config CRC_CCITT 67 tristate "CRC-CCITT functions" 68 help 69 This option is provided for the case where no in-kernel-tree 70 modules require CRC-CCITT functions, but a module built outside 71 the kernel tree does. Such modules that use library CRC-CCITT 72 functions require M here. 73 74config CRC16 75 tristate "CRC16 functions" 76 help 77 This option is provided for the case where no in-kernel-tree 78 modules require CRC16 functions, but a module built outside 79 the kernel tree does. Such modules that use library CRC16 80 functions require M here. 81 82config CRC_T10DIF 83 tristate "CRC calculation for the T10 Data Integrity Field" 84 select CRYPTO 85 select CRYPTO_CRCT10DIF 86 help 87 This option is only needed if a module that's not in the 88 kernel tree needs to calculate CRC checks for use with the 89 SCSI data integrity subsystem. 90 91config CRC_ITU_T 92 tristate "CRC ITU-T V.41 functions" 93 help 94 This option is provided for the case where no in-kernel-tree 95 modules require CRC ITU-T V.41 functions, but a module built outside 96 the kernel tree does. Such modules that use library CRC ITU-T V.41 97 functions require M here. 98 99config CRC32 100 tristate "CRC32/CRC32c functions" 101 default y 102 select BITREVERSE 103 help 104 This option is provided for the case where no in-kernel-tree 105 modules require CRC32/CRC32c functions, but a module built outside 106 the kernel tree does. Such modules that use library CRC32/CRC32c 107 functions require M here. 108 109config CRC32_SELFTEST 110 bool "CRC32 perform self test on init" 111 default n 112 depends on CRC32 113 help 114 This option enables the CRC32 library functions to perform a 115 self test on initialization. The self test computes crc32_le 116 and crc32_be over byte strings with random alignment and length 117 and computes the total elapsed time and number of bytes processed. 118 119choice 120 prompt "CRC32 implementation" 121 depends on CRC32 122 default CRC32_SLICEBY8 123 help 124 This option allows a kernel builder to override the default choice 125 of CRC32 algorithm. Choose the default ("slice by 8") unless you 126 know that you need one of the others. 127 128config CRC32_SLICEBY8 129 bool "Slice by 8 bytes" 130 help 131 Calculate checksum 8 bytes at a time with a clever slicing algorithm. 132 This is the fastest algorithm, but comes with a 8KiB lookup table. 133 Most modern processors have enough cache to hold this table without 134 thrashing the cache. 135 136 This is the default implementation choice. Choose this one unless 137 you have a good reason not to. 138 139config CRC32_SLICEBY4 140 bool "Slice by 4 bytes" 141 help 142 Calculate checksum 4 bytes at a time with a clever slicing algorithm. 143 This is a bit slower than slice by 8, but has a smaller 4KiB lookup 144 table. 145 146 Only choose this option if you know what you are doing. 147 148config CRC32_SARWATE 149 bool "Sarwate's Algorithm (one byte at a time)" 150 help 151 Calculate checksum a byte at a time using Sarwate's algorithm. This 152 is not particularly fast, but has a small 256 byte lookup table. 153 154 Only choose this option if you know what you are doing. 155 156config CRC32_BIT 157 bool "Classic Algorithm (one bit at a time)" 158 help 159 Calculate checksum one bit at a time. This is VERY slow, but has 160 no lookup table. This is provided as a debugging option. 161 162 Only choose this option if you are debugging crc32. 163 164endchoice 165 166config CRC7 167 tristate "CRC7 functions" 168 help 169 This option is provided for the case where no in-kernel-tree 170 modules require CRC7 functions, but a module built outside 171 the kernel tree does. Such modules that use library CRC7 172 functions require M here. 173 174config LIBCRC32C 175 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 176 select CRYPTO 177 select CRYPTO_CRC32C 178 help 179 This option is provided for the case where no in-kernel-tree 180 modules require CRC32c functions, but a module built outside the 181 kernel tree does. Such modules that use library CRC32c functions 182 require M here. See Castagnoli93. 183 Module will be libcrc32c. 184 185config CRC8 186 tristate "CRC8 function" 187 help 188 This option provides CRC8 function. Drivers may select this 189 when they need to do cyclic redundancy check according CRC8 190 algorithm. Module will be called crc8. 191 192config AUDIT_GENERIC 193 bool 194 depends on AUDIT && !AUDIT_ARCH 195 default y 196 197config AUDIT_ARCH_COMPAT_GENERIC 198 bool 199 default n 200 201config AUDIT_COMPAT_GENERIC 202 bool 203 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 204 default y 205 206config RANDOM32_SELFTEST 207 bool "PRNG perform self test on init" 208 default n 209 help 210 This option enables the 32 bit PRNG library functions to perform a 211 self test on initialization. 212 213# 214# compression support is select'ed if needed 215# 216config ZLIB_INFLATE 217 tristate 218 219config ZLIB_DEFLATE 220 tristate 221 222config LZO_COMPRESS 223 tristate 224 225config LZO_DECOMPRESS 226 tristate 227 228config LZ4_COMPRESS 229 tristate 230 231config LZ4HC_COMPRESS 232 tristate 233 234config LZ4_DECOMPRESS 235 tristate 236 237source "lib/xz/Kconfig" 238 239# 240# These all provide a common interface (hence the apparent duplication with 241# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 242# 243config DECOMPRESS_GZIP 244 select ZLIB_INFLATE 245 tristate 246 247config DECOMPRESS_BZIP2 248 tristate 249 250config DECOMPRESS_LZMA 251 tristate 252 253config DECOMPRESS_XZ 254 select XZ_DEC 255 tristate 256 257config DECOMPRESS_LZO 258 select LZO_DECOMPRESS 259 tristate 260 261config DECOMPRESS_LZ4 262 select LZ4_DECOMPRESS 263 tristate 264 265# 266# Generic allocator support is selected if needed 267# 268config GENERIC_ALLOCATOR 269 boolean 270 271# 272# reed solomon support is select'ed if needed 273# 274config REED_SOLOMON 275 tristate 276 277config REED_SOLOMON_ENC8 278 boolean 279 280config REED_SOLOMON_DEC8 281 boolean 282 283config REED_SOLOMON_ENC16 284 boolean 285 286config REED_SOLOMON_DEC16 287 boolean 288 289# 290# BCH support is selected if needed 291# 292config BCH 293 tristate 294 295config BCH_CONST_PARAMS 296 boolean 297 help 298 Drivers may select this option to force specific constant 299 values for parameters 'm' (Galois field order) and 't' 300 (error correction capability). Those specific values must 301 be set by declaring default values for symbols BCH_CONST_M 302 and BCH_CONST_T. 303 Doing so will enable extra compiler optimizations, 304 improving encoding and decoding performance up to 2x for 305 usual (m,t) values (typically such that m*t < 200). 306 When this option is selected, the BCH library supports 307 only a single (m,t) configuration. This is mainly useful 308 for NAND flash board drivers requiring known, fixed BCH 309 parameters. 310 311config BCH_CONST_M 312 int 313 range 5 15 314 help 315 Constant value for Galois field order 'm'. If 'k' is the 316 number of data bits to protect, 'm' should be chosen such 317 that (k + m*t) <= 2**m - 1. 318 Drivers should declare a default value for this symbol if 319 they select option BCH_CONST_PARAMS. 320 321config BCH_CONST_T 322 int 323 help 324 Constant value for error correction capability in bits 't'. 325 Drivers should declare a default value for this symbol if 326 they select option BCH_CONST_PARAMS. 327 328# 329# Textsearch support is select'ed if needed 330# 331config TEXTSEARCH 332 boolean 333 334config TEXTSEARCH_KMP 335 tristate 336 337config TEXTSEARCH_BM 338 tristate 339 340config TEXTSEARCH_FSM 341 tristate 342 343config BTREE 344 boolean 345 346config INTERVAL_TREE 347 boolean 348 help 349 Simple, embeddable, interval-tree. Can find the start of an 350 overlapping range in log(n) time and then iterate over all 351 overlapping nodes. The algorithm is implemented as an 352 augmented rbtree. 353 354 See: 355 356 Documentation/rbtree.txt 357 358 for more information. 359 360config ASSOCIATIVE_ARRAY 361 bool 362 help 363 Generic associative array. Can be searched and iterated over whilst 364 it is being modified. It is also reasonably quick to search and 365 modify. The algorithms are non-recursive, and the trees are highly 366 capacious. 367 368 See: 369 370 Documentation/assoc_array.txt 371 372 for more information. 373 374config HAS_IOMEM 375 boolean 376 depends on !NO_IOMEM 377 select GENERIC_IO 378 default y 379 380config HAS_IOPORT_MAP 381 boolean 382 depends on HAS_IOMEM && !NO_IOPORT_MAP 383 default y 384 385config HAS_DMA 386 boolean 387 depends on !NO_DMA 388 default y 389 390config CHECK_SIGNATURE 391 bool 392 393config CPUMASK_OFFSTACK 394 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 395 help 396 Use dynamic allocation for cpumask_var_t, instead of putting 397 them on the stack. This is a bit more expensive, but avoids 398 stack overflow. 399 400config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 401 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS 402 depends on BROKEN 403 404config CPU_RMAP 405 bool 406 depends on SMP 407 408config DQL 409 bool 410 411config GLOB 412 bool 413# This actually supports modular compilation, but the module overhead 414# is ridiculous for the amount of code involved. Until an out-of-tree 415# driver asks for it, we'll just link it directly it into the kernel 416# when required. Since we're ignoring out-of-tree users, there's also 417# no need bother prompting for a manual decision: 418# prompt "glob_match() function" 419 help 420 This option provides a glob_match function for performing 421 simple text pattern matching. It originated in the ATA code 422 to blacklist particular drive models, but other device drivers 423 may need similar functionality. 424 425 All drivers in the Linux kernel tree that require this function 426 should automatically select this option. Say N unless you 427 are compiling an out-of tree driver which tells you that it 428 depends on this. 429 430config GLOB_SELFTEST 431 bool "glob self-test on init" 432 default n 433 depends on GLOB 434 help 435 This option enables a simple self-test of the glob_match 436 function on startup. It is primarily useful for people 437 working on the code to ensure they haven't introduced any 438 regressions. 439 440 It only adds a little bit of code and slows kernel boot (or 441 module load) by a small amount, so you're welcome to play with 442 it, but you probably don't need it. 443 444# 445# Netlink attribute parsing support is select'ed if needed 446# 447config NLATTR 448 bool 449 450# 451# Generic 64-bit atomic support is selected if needed 452# 453config GENERIC_ATOMIC64 454 bool 455 456config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 457 def_bool y if GENERIC_ATOMIC64 458 459config LRU_CACHE 460 tristate 461 462config AVERAGE 463 bool "Averaging functions" 464 help 465 This option is provided for the case where no in-kernel-tree 466 modules require averaging functions, but a module built outside 467 the kernel tree does. Such modules that use library averaging 468 functions require Y here. 469 470 If unsure, say N. 471 472config CLZ_TAB 473 bool 474 475config CORDIC 476 tristate "CORDIC algorithm" 477 help 478 This option provides an implementation of the CORDIC algorithm; 479 calculations are in fixed point. Module will be called cordic. 480 481config DDR 482 bool "JEDEC DDR data" 483 help 484 Data from JEDEC specs for DDR SDRAM memories, 485 particularly the AC timing parameters and addressing 486 information. This data is useful for drivers handling 487 DDR SDRAM controllers. 488 489config MPILIB 490 tristate 491 select CLZ_TAB 492 help 493 Multiprecision maths library from GnuPG. 494 It is used to implement RSA digital signature verification, 495 which is used by IMA/EVM digital signature extension. 496 497config SIGNATURE 498 tristate 499 depends on KEYS 500 select CRYPTO 501 select CRYPTO_SHA1 502 select MPILIB 503 help 504 Digital signature verification. Currently only RSA is supported. 505 Implementation is done using GnuPG MPI library 506 507# 508# libfdt files, only selected if needed. 509# 510config LIBFDT 511 bool 512 513config OID_REGISTRY 514 tristate 515 help 516 Enable fast lookup object identifier registry. 517 518config UCS2_STRING 519 tristate 520 521source "lib/fonts/Kconfig" 522 523# 524# sg chaining option 525# 526 527config ARCH_HAS_SG_CHAIN 528 def_bool n 529 530endmenu 531