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 RATIONAL 17 boolean 18 19config GENERIC_STRNCPY_FROM_USER 20 bool 21 22config GENERIC_STRNLEN_USER 23 bool 24 25config GENERIC_NET_UTILS 26 bool 27 28config GENERIC_FIND_FIRST_BIT 29 bool 30 31config NO_GENERIC_PCI_IOPORT_MAP 32 bool 33 34config GENERIC_PCI_IOMAP 35 bool 36 37config GENERIC_IOMAP 38 bool 39 select GENERIC_PCI_IOMAP 40 41config GENERIC_IO 42 boolean 43 default n 44 45config STMP_DEVICE 46 bool 47 48config PERCPU_RWSEM 49 boolean 50 51config ARCH_USE_CMPXCHG_LOCKREF 52 bool 53 54config ARCH_HAS_FAST_MULTIPLIER 55 bool 56 57config CRC_CCITT 58 tristate "CRC-CCITT functions" 59 help 60 This option is provided for the case where no in-kernel-tree 61 modules require CRC-CCITT functions, but a module built outside 62 the kernel tree does. Such modules that use library CRC-CCITT 63 functions require M here. 64 65config CRC16 66 tristate "CRC16 functions" 67 help 68 This option is provided for the case where no in-kernel-tree 69 modules require CRC16 functions, but a module built outside 70 the kernel tree does. Such modules that use library CRC16 71 functions require M here. 72 73config CRC_T10DIF 74 tristate "CRC calculation for the T10 Data Integrity Field" 75 select CRYPTO 76 select CRYPTO_CRCT10DIF 77 help 78 This option is only needed if a module that's not in the 79 kernel tree needs to calculate CRC checks for use with the 80 SCSI data integrity subsystem. 81 82config CRC_ITU_T 83 tristate "CRC ITU-T V.41 functions" 84 help 85 This option is provided for the case where no in-kernel-tree 86 modules require CRC ITU-T V.41 functions, but a module built outside 87 the kernel tree does. Such modules that use library CRC ITU-T V.41 88 functions require M here. 89 90config CRC32 91 tristate "CRC32/CRC32c functions" 92 default y 93 select BITREVERSE 94 help 95 This option is provided for the case where no in-kernel-tree 96 modules require CRC32/CRC32c functions, but a module built outside 97 the kernel tree does. Such modules that use library CRC32/CRC32c 98 functions require M here. 99 100config CRC32_SELFTEST 101 bool "CRC32 perform self test on init" 102 default n 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 CRC7 158 tristate "CRC7 functions" 159 help 160 This option is provided for the case where no in-kernel-tree 161 modules require CRC7 functions, but a module built outside 162 the kernel tree does. Such modules that use library CRC7 163 functions require M here. 164 165config LIBCRC32C 166 tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check" 167 select CRYPTO 168 select CRYPTO_CRC32C 169 help 170 This option is provided for the case where no in-kernel-tree 171 modules require CRC32c functions, but a module built outside the 172 kernel tree does. Such modules that use library CRC32c functions 173 require M here. See Castagnoli93. 174 Module will be libcrc32c. 175 176config CRC8 177 tristate "CRC8 function" 178 help 179 This option provides CRC8 function. Drivers may select this 180 when they need to do cyclic redundancy check according CRC8 181 algorithm. Module will be called crc8. 182 183config AUDIT_GENERIC 184 bool 185 depends on AUDIT && !AUDIT_ARCH 186 default y 187 188config AUDIT_ARCH_COMPAT_GENERIC 189 bool 190 default n 191 192config AUDIT_COMPAT_GENERIC 193 bool 194 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT 195 default y 196 197config RANDOM32_SELFTEST 198 bool "PRNG perform self test on init" 199 default n 200 help 201 This option enables the 32 bit PRNG library functions to perform a 202 self test on initialization. 203 204# 205# compression support is select'ed if needed 206# 207config ZLIB_INFLATE 208 tristate 209 210config ZLIB_DEFLATE 211 tristate 212 213config LZO_COMPRESS 214 tristate 215 216config LZO_DECOMPRESS 217 tristate 218 219config LZ4_COMPRESS 220 tristate 221 222config LZ4HC_COMPRESS 223 tristate 224 225config LZ4_DECOMPRESS 226 tristate 227 228source "lib/xz/Kconfig" 229 230# 231# These all provide a common interface (hence the apparent duplication with 232# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.) 233# 234config DECOMPRESS_GZIP 235 select ZLIB_INFLATE 236 tristate 237 238config DECOMPRESS_BZIP2 239 tristate 240 241config DECOMPRESS_LZMA 242 tristate 243 244config DECOMPRESS_XZ 245 select XZ_DEC 246 tristate 247 248config DECOMPRESS_LZO 249 select LZO_DECOMPRESS 250 tristate 251 252config DECOMPRESS_LZ4 253 select LZ4_DECOMPRESS 254 tristate 255 256# 257# Generic allocator support is selected if needed 258# 259config GENERIC_ALLOCATOR 260 boolean 261 262# 263# reed solomon support is select'ed if needed 264# 265config REED_SOLOMON 266 tristate 267 268config REED_SOLOMON_ENC8 269 boolean 270 271config REED_SOLOMON_DEC8 272 boolean 273 274config REED_SOLOMON_ENC16 275 boolean 276 277config REED_SOLOMON_DEC16 278 boolean 279 280# 281# BCH support is selected if needed 282# 283config BCH 284 tristate 285 286config BCH_CONST_PARAMS 287 boolean 288 help 289 Drivers may select this option to force specific constant 290 values for parameters 'm' (Galois field order) and 't' 291 (error correction capability). Those specific values must 292 be set by declaring default values for symbols BCH_CONST_M 293 and BCH_CONST_T. 294 Doing so will enable extra compiler optimizations, 295 improving encoding and decoding performance up to 2x for 296 usual (m,t) values (typically such that m*t < 200). 297 When this option is selected, the BCH library supports 298 only a single (m,t) configuration. This is mainly useful 299 for NAND flash board drivers requiring known, fixed BCH 300 parameters. 301 302config BCH_CONST_M 303 int 304 range 5 15 305 help 306 Constant value for Galois field order 'm'. If 'k' is the 307 number of data bits to protect, 'm' should be chosen such 308 that (k + m*t) <= 2**m - 1. 309 Drivers should declare a default value for this symbol if 310 they select option BCH_CONST_PARAMS. 311 312config BCH_CONST_T 313 int 314 help 315 Constant value for error correction capability in bits 't'. 316 Drivers should declare a default value for this symbol if 317 they select option BCH_CONST_PARAMS. 318 319# 320# Textsearch support is select'ed if needed 321# 322config TEXTSEARCH 323 boolean 324 325config TEXTSEARCH_KMP 326 tristate 327 328config TEXTSEARCH_BM 329 tristate 330 331config TEXTSEARCH_FSM 332 tristate 333 334config BTREE 335 boolean 336 337config INTERVAL_TREE 338 boolean 339 help 340 Simple, embeddable, interval-tree. Can find the start of an 341 overlapping range in log(n) time and then iterate over all 342 overlapping nodes. The algorithm is implemented as an 343 augmented rbtree. 344 345 See: 346 347 Documentation/rbtree.txt 348 349 for more information. 350 351config ASSOCIATIVE_ARRAY 352 bool 353 help 354 Generic associative array. Can be searched and iterated over whilst 355 it is being modified. It is also reasonably quick to search and 356 modify. The algorithms are non-recursive, and the trees are highly 357 capacious. 358 359 See: 360 361 Documentation/assoc_array.txt 362 363 for more information. 364 365config HAS_IOMEM 366 boolean 367 depends on !NO_IOMEM 368 select GENERIC_IO 369 default y 370 371config HAS_IOPORT_MAP 372 boolean 373 depends on HAS_IOMEM && !NO_IOPORT_MAP 374 default y 375 376config HAS_DMA 377 boolean 378 depends on !NO_DMA 379 default y 380 381config CHECK_SIGNATURE 382 bool 383 384config CPUMASK_OFFSTACK 385 bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS 386 help 387 Use dynamic allocation for cpumask_var_t, instead of putting 388 them on the stack. This is a bit more expensive, but avoids 389 stack overflow. 390 391config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 392 bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS 393 depends on BROKEN 394 395config CPU_RMAP 396 bool 397 depends on SMP 398 399config DQL 400 bool 401 402config GLOB 403 bool 404# This actually supports modular compilation, but the module overhead 405# is ridiculous for the amount of code involved. Until an out-of-tree 406# driver asks for it, we'll just link it directly it into the kernel 407# when required. Since we're ignoring out-of-tree users, there's also 408# no need bother prompting for a manual decision: 409# prompt "glob_match() function" 410 help 411 This option provides a glob_match function for performing 412 simple text pattern matching. It originated in the ATA code 413 to blacklist particular drive models, but other device drivers 414 may need similar functionality. 415 416 All drivers in the Linux kernel tree that require this function 417 should automatically select this option. Say N unless you 418 are compiling an out-of tree driver which tells you that it 419 depends on this. 420 421config GLOB_SELFTEST 422 bool "glob self-test on init" 423 default n 424 depends on GLOB 425 help 426 This option enables a simple self-test of the glob_match 427 function on startup. It is primarily useful for people 428 working on the code to ensure they haven't introduced any 429 regressions. 430 431 It only adds a little bit of code and slows kernel boot (or 432 module load) by a small amount, so you're welcome to play with 433 it, but you probably don't need it. 434 435# 436# Netlink attribute parsing support is select'ed if needed 437# 438config NLATTR 439 bool 440 441# 442# Generic 64-bit atomic support is selected if needed 443# 444config GENERIC_ATOMIC64 445 bool 446 447config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 448 def_bool y if GENERIC_ATOMIC64 449 450config LRU_CACHE 451 tristate 452 453config AVERAGE 454 bool "Averaging functions" 455 help 456 This option is provided for the case where no in-kernel-tree 457 modules require averaging functions, but a module built outside 458 the kernel tree does. Such modules that use library averaging 459 functions require Y here. 460 461 If unsure, say N. 462 463config CLZ_TAB 464 bool 465 466config CORDIC 467 tristate "CORDIC algorithm" 468 help 469 This option provides an implementation of the CORDIC algorithm; 470 calculations are in fixed point. Module will be called cordic. 471 472config DDR 473 bool "JEDEC DDR data" 474 help 475 Data from JEDEC specs for DDR SDRAM memories, 476 particularly the AC timing parameters and addressing 477 information. This data is useful for drivers handling 478 DDR SDRAM controllers. 479 480config MPILIB 481 tristate 482 select CLZ_TAB 483 help 484 Multiprecision maths library from GnuPG. 485 It is used to implement RSA digital signature verification, 486 which is used by IMA/EVM digital signature extension. 487 488config SIGNATURE 489 tristate 490 depends on KEYS 491 select CRYPTO 492 select CRYPTO_SHA1 493 select MPILIB 494 help 495 Digital signature verification. Currently only RSA is supported. 496 Implementation is done using GnuPG MPI library 497 498# 499# libfdt files, only selected if needed. 500# 501config LIBFDT 502 bool 503 504config OID_REGISTRY 505 tristate 506 help 507 Enable fast lookup object identifier registry. 508 509config UCS2_STRING 510 tristate 511 512source "lib/fonts/Kconfig" 513 514# 515# sg chaining option 516# 517 518config ARCH_HAS_SG_CHAIN 519 def_bool n 520 521endmenu 522